THERMO SCIENTIFIC F85930-33 (01) PDF DOCUMENT

DANGER:

Do not modify or use equipment in a manner other than expressly intended. Modification of equipment other than that for which it is explicitly designed could cause severe injury or death. Any customer after-market retrofit violates the warranty of the equipment.

Do not modify or disconnect any safety features provided. Disconnection of the unit safety features could allow the unit to become overheated and start on fire, causing personal injury or death, product and property damage.

Do not use components or materials not specifically designed for this equipment. Failure to comply with this precaution could result in damage to equipment used or the furnace and may create an overheat situation. Also, do not use anything other than OEM exact replacement equipment and parts. Not using OEM replacement parts could cause faulty instrumentation readings, inoperable equipment, or temperature overshoot. Both situations may cause personal injury or death, product, and property damage.

Before using, user shall determine the suitability and integrity of the product for the intended use and that the unit has not been altered in any way. Misapplication may compromise the safety of the end user or the life of the product.

WARNING: Use appropriate Personal Protective Equipment (PPE) per local protocols.

CAUTION: This product contains refractory ceramic fiber or other refractories which can result in the following:

May be irritating to skin, eyes, and respiratory tract.

May be harmful if inhaled.

May contain or form cristobalite (crystalline silica) with use at high temperature (above 871°C (1599.8°F)) which can cause severe respiratory disease.

Possible cancer hazard based on tests with laboratory animals. Animal studies to date are inconclusive. No human exposure studies with this product have been reported.

WARNING: Before maintaining this equipment, read the applicable SDS (Safety Data Sheets). SDS is provided with unit.

To avoid electrical shock:

1. This furnace must be installed by a licensed electrician and/or qualified craftsperson in accordance with all applicable National and local, Electrical codes and requirements.

2. Disconnect power before servicing. Ensure main circuit breaker at the rear panel is OFF.

3. Ensure that the furnace is not connected to the power supply prior to installing or removing the balance.

4. Ensure that the door switch is operating properly.

To avoid burns:

1. Do not touch the exterior or interior surfaces of the chamber or exhaust area when chamber is hot. “Hot Surface. Avoid Contact with Chamber Area.”

To avoid personal injury:

1. Do not use in the presence of flammable or combustible materials; including cutback asphalts; fire or explosion may result. This device contains components which may ignite such material.

2. Refer servicing to properly trained, and qualified personnel.

3. Allow the furnace to cool to room temperature before performing any maintenance or servicing.

4. Failure to connect the exhaust port to an appropriate exhaust system will result in smoke and gases entering the work area. Without the connection, gases and smoke will escape from the furnace.

5. This furnace contains refractory ceramic insulation which can produce respirable fibers and dust when handled. These fibers can cause irritation and can aggravate preexisting respiratory disease. The International Agency for Research on Cancer (IARC) has classified refractory ceramic fiber as possibly carcinogenic. After service refractory ceramic fiber dust may contain crystalline silica, which may cause lung damage (silicosis) and which has been classified by IARC as a carcinogen.

Intended Use

The NCAT Asphalt Content Tester is an analyzer which determines the asphalt content of a sample by loss on ignition per standard methods. The asphalt sample is bathed in oxygenated air and weighed continuously throughout the ignition procedure. The NCAT Asphalt Content Tester’s software identifies the endpoint of ignition and indicates the completion of the test. Results are documented by a printer.

Non-Intended Use

This furnace is not intended for the following:

• To heat up food.

• For drying or heat treatment of substances which release gases or vapors into the atmosphere that are flammable or dangerously explosive when mixed with air.

• This furnace is equally unsuitable for the heat treatment of combustible dusts and fibrous materials.

• Cleaning glassware, such as rolling thin film oven bottles. Prior to ignition, the asphalt in these bottles will liquefy and may flow into the lower control section of this product, causing severe damage or fire.

1. Visually check for any physical damage to the shipping container. Remove the furnace from the shipping container. Inspect the equipment surfaces that are adjacent to any damaged area of the shipping container. Retain damaged packing material. File claim with the delivery carrier if damage is incurred.

2. Open the furnace door and carefully remove packing material from inside the furnace chamber. Remove the screws (4) securing the front display panel. Open the front display panel. Vacuum the chamber and the balance support plate (beneath the chamber) prior to use to remove the insulation dust which may have accumulated during shipment. Wear a dust mask and gloves while cleaning.

3. Remove the balance, ceramic posts, fuses, manual (or USB stick) and hearth tray from the shipping container.

4. Retain the original packaging material if reshipment is foreseen.

Allow adequate work area and bench space for loading and unloading. Locate the cooling plate alongside the furnace to allow for convenient transport of hot loads.

NOTE: The NCAT Asphalt Content Tester is intended for permanent connection to mains power. This must be performed by a licensed electrician/qualified craftperson in accordance with all applicable National and local electrical codes and requirements.

Each palletized furnace carton contains:

1 Asphalt Content Tester

1 Electronic Balance

1 Hearth tray, gray silicon carbide

8 Ceramic tube supports, Inside Furnace Chamber

1 Instruction Manual, Inside Furnace Chamber

6 Replacement Fuses

Accessory Kit Contents Part # AY1087X1

Two basket assemblies consisting of:

2 Basket Retainer Brackets (BC1087X9)

2 Transport and Catch Trays (TY1087X3)

2 Top Baskets (TY1087X4)

2 Bottom Baskets (TY1087X5)

2 Covers for Top Baskets (CV1087X7)

1 Transport Handle (HN1087X4)

1 Aluminum Cooldown Plate (SH1087X1)

1 Cooldown Safety Cage with HOT Sign (CS1087X5)

1 Face Shield with Head gear (AYX4)

1 Pair High Temperature Gloves (AYX5)

1 Can of Fan Motor Lubricant (AYX6)

1 Stainless Steel Basket Brush (AYX7)

4 Rolls of Thermal Printer Paper (PRX2)

Optional purchase:

1 Length of exhaust tubing (3″ I.D. x 10)

CAUTION: Be sure ambient temperature does not exceed 40°C (104°F). Ambients above this level may result in damage to or malfunction of the controller.

Allow at least 6 inches of space between the furnace and a surface, and at least 40 inches above the furnace. This permits the heat from furnace case to escape so as not to create a possible fire hazard.

Do not install above or near flammables. This unit has hot surfaces. Do not install in close proximity to flammable substances.

Lifting and handling instructions

The furnace weighs 302Lbs, do not attempt to lift by hand. The furnace should be moved into place by a suitable lifting device. Established safe lifting and moving practices must be employed. Consult trained professionals.

Site Selection

• Place the furnace on a sturdy level surface about 26-28 inches high and capable of supporting the weight of the fully assembled furnace.

• Furnace must be placed on a level surface to permit door to safely swing and remain open for loading and unloading.

• Allow space for air flow around the furnace (6″ minimum).

• Locate the furnace so you can direct the furnace’s emissions through ducting to a fume hood or other appropriate ventilation system.

• We recommend an exhaust length of not more than 10 feet, if possible.

• Leveling feet are adjustable. The furnace should be leveled so the door will remain open.

WARNING: This furnace must be installed by a licensed electrician and/or qualified craftsperson in accordance with all applicable National and local, Electrical codes and requirements.

The installation must include an external 35Amp Branch Circuit Protection that is properly rated for the application.

Branch Circuit Protection must be Certified in accordance with IEC 60947-2.

CAUTION: For supply connections, use 10 AWG or larger copper conductors only suitable for at least 90°C. Failure to observe this caution could result in damage to furnace and/or work area.

The electrical specifications are:

Prior to connecting your asphalt testing furnace to your electrical supply, be sure the front power switch and rear circuit breaker are in the OFF position.

The power supply entry is located at the right rear of the lower case (as you face the rear of the unit). A terminal block is located behind an access plate. Remove the six screws retaining the plate covering the terminal connection block. The line and ground connections to the terminal block are depicted in the manual.

Your NCAT Asphalt Content Tester must be connected directly through a conduit system. Electrical wiring should conform to your local electrical code requirements.

Note: Unit supplied with 7/8″ Hole covered with a bushing that is sized for 1/2″ conduit / connections per electrical standards. Utilize strain reliefs as needed.

WARNING: Failure to connect the exhaust port to an appropriate exhaust system will result in smoke and gases entering the work area. Without the connection, gases and smoke will escape from the furnace.

CAUTION: Do not connect the exhaust port to tubing less than 3″ in diameter or otherwise restrict the exhaust flow from the furnace. Also, do not connect the tubing directly to an external fan or otherwise increase the velocity of the exhaust flow from the furnace. Either restricting or increasing the exhaust flow from the furnace may damage the furnace or reduce its efficiency.

1. Select a location to minimize exhaust length. We recommend an exhaust length of not more than 10 feet.

2. Flexible 3″ I.D. seamless steel tubing or electrogalvanized steel tubing is recommended for venting. Seal connections at blower exit at the top of the tester with clear silicon caulk/sealant. Use sparingly so the exhaust tube can be detached for servicing. Do not use galvanized tin dryer pipe or double-wall galvanized tin as the seams will leak fumes into the lab. Do not use vent pipe that is reduced to less than 3″ I.D.

3. Minimize 90° bends in your exhaust system if possible. Bends restrict the exhaust air flow and tend to accumulate particulates which can also restrict air flow.

4. Termination of your exhaust system may be in open air or to a larger exhaust duct. Open air termination is the most efficient. Duct termination should not be in the vicinity of fresh air intakes. Also, the duct cap must not restrict the air flow. Exhausting into a larger duct requires an airtight connection. The larger duct must not create a positive air pressure internally which can diminish the “tester’s” blower efficiency. Perform the “lift test” to ensure a -3.2 to -8.2 gram lift. Increasing the velocity of the exhaust flow above the lift of 8.2 grams may blow fines from the basket resulting in an exaggerated asphalt cement content.

5. Turn on fume hood blowers and conduct “lift test” to ensure the -3.5 to -8.2 gram lift is maintained. Perform the test with room doors open and closed to ensure proper makeup air for the room.

WARNING: Ensure that the furnace is not connected to the power supply prior to installing or removing the balance.

CAUTION: Do not allow the ceramic support tubes to contact the sides of the tube ports, as this will cause an unstable and inaccurate balance readout.

Install support plate onto balance load cell with the screws provided as shown. Note: Do not close the control panel yet.

To install the balance:

1. Ensure that the furnace is disconnected from the power supply. Ensure the main circuit breaker on the rear panel of the furnace is in the OFF position. Remove the four screws along the top of the front control panel securing the control panel to the lower case of the furnace. Move furnace forward about 2 inches beyond counter edge or adjust all feet up about 1/4 inch. This will allow the hinged control panel to open without obstruction.

2. Open the lower case by carefully pulling the control panel forward and downward. The control panel is hinged on the bottom edge to the lower furnace case. Do not allow the panel to fall completely open as this may excessively strain cables attached to the panel.

3. Inside the lower furnace case, observe the suspended table (balance support plate) supported by four aluminum rods. The balance will be supported by this table. Vacuum the table if dust, etc., appears on it.

4. Mount the support plate and the catch pan on the balance. Note the four pins on the catch-pan. These will retain the ceramic support tubes, which will project into the furnace chamber after mounting.

5. Place the Setra balance on the balance support table so that the gray ribbon cable is protruding from your left. This gray ribbon cable will be plugged into the front panel display board, into the connector marked P2. On this same display board, the connector marked P6 should have a red and white power jack cable plugged into it, and the connector marked P3 should have a 9-pin ribbon cable connected to it. All three of these connections are necessary in order for the Setra balance to function.

6. Position the balance so that the pins on the platform support plate are directly beneath the four tube ports in the bottom of the furnace chamber.

7. Open the furnace door. Insert the four ceramic support tubes through the tube ports located in the bottom of the furnace chamber. Adjust the position of the balance until the four ceramic support tubes are seated on the appropriate pins on the balance plate. Finely adjust the position of the balance until the tubes are centered in their ports, but not touching the sides of the ports.

8. Place the 10″ x 11″ gray silicon carbide hearth tray on the four ceramic support tubes with the 11″ dimension from front to back. Position the front of the hearth tray about one inch back from the lip of the bottom element plate. Center the hearth tray on the four support tubes, equally distant from side to side.

9. Close the lower case by returning the control panel to its original position. Secure the control panel with the four screws you removed in step 1.

10. Switch the main circuit breaker (located on the lower left rear corner of the case when facing the front of the furnace) on. Close the furnace door and switch the power switch “on”. The balance display board will read 0.0 grams after approximately 20 seconds of initialization. Turn power “off” and reposition the balance if the display is unstable or reads anything other than 0.0 grams. Instability may be caused by one of the support tubes rubbing.

The balance control buttons can be accessed through the pin holes located on the right front furnace control panel, below the balance indicator, with a tool of 0.063 diameter or smaller.

1. Switch the green power switch down to “OFF”.

2. While holding the “4” key down, switch the green power switch up to “ON”, the red display should indicate [BAL CAL].

3. Press and hold the balance “ON/OFF” key.

4. Press the balance “ENTER” key, then release both keys. “71nE” will be displayed, press the balance “ENTER” key. The two hour digits will be blinking (Note the time is in a 24 hour format).

5. Press the balance “ON/OFF” key until the correct hour is displayed.

6. Press the balance “ENTER” key, the two minute digits will be blinking.

7. Press the balance “ON/OFF” key until the correct minute is displayed.

8. Press the balance “ENTER” key, the balance will return to the normal weight display.

1. Switch the green power switch down to “OFF”.

2. While holding the “4” key down, switch the green power switch up to “ON”, the red display should indicate [BAL CAL].

3. Press and hold the balance “ON/OFF” key.

4. Press the balance “ENTER” key, then release both keys. [71nE] will be displayed, press the balance “ON/OFF” key, [dA7E] will be displayed.

5. Press the balance “ENTER” key, [US] (United States) or [Eur0] (European) date type will be displayed.

6. Press the balance “ON/OFF” key until the desired type is displayed.

7. Press the balance “ENTER” key, [2d Yr] (Two digit year) or [4d Yr] (Four digit year) will be displayed.

8. Press the balance “ON/OFF” key until the desired format is displayed.

9. Press the balance “ENTER” key, [dAY XX] (Day) will be displayed.

10. Press the balance “ON/OFF” key until the desired day is displayed.

11. Press the balance “ENTER” key, [nn0 XX] (Month) will be displayed.

12. Press the balance “ON/OFF” key until the desired month is displayed.

13. Press the balance “ENTER” key, [Yr XX] (Year) will be displayed.

14. Press the balance “ON/OFF” key until the desired year is displayed.

15. Press the balance “ENTER” key, the balance will return to the normal weight display.

1. Switch the green power switch down to “OFF”.

2. After furnace has cooled to room temperature, open the furnace door.

3. Remove and clean any debris from the ceramic load plate, balance load plate, and ceramic support posts, replace posts and plates.

4. While holding the “4” key down, switch the green power switch up to “ON”, the red display should indicate [BAL CAL].

5. Press and hold the balance “ON/OFF” key.

6. Press the balance “ENTER” key, then release both keys. [71nE] will be displayed, press the balance “ON/OFF” key twice, [CAL] will be displayed.

7. Press the balance “ENTER” key, [LOAd 8000] will be blinking on the display.

8. Place an 8000 gram (NIST traceable) weight on the ceramic load plate in the furnace.

9. Press the balance “ENTER” key, the balance will display [ACAL], then return to the normal weight display.

Note: Furnace door should remain open during the balance calibration.

Note: The balance must display “0.0” before doing calibration.

1. Switch the green power switch down to “OFF”.

2. While holding the “4” key down, switch the green power switch up to “ON”, the red display should indicate [BAL CAL].

3. Press and hold the balance “ON/OFF” key.

4. Press the balance “ENTER” key, then release both keys. [71nE] will be displayed, press the balance “ON/OFF” key three times, [FACdEF] will be displayed.

5. Press the balance “ENTER” key, the balance will display [BUSY], then return to the normal weight display.

Note: This function is to reset parameters inside the balance which are not user accessible, the TIME, DATE, and BALANCE CALIBRATION are unaffected.

CAUTION: Perform the “lift test” only when the furnace is at room temperature.

The efficiency of the blower and/or exhaust system is indirectly monitored by a quick test procedure named the “lift test”. The procedure is detailed as follows:

1. Fully assemble tester with exhaust system attached, hearth tray is mounted on the four ceramic support tubes, and at room temperature with no load. This test should always be performed with the furnace chamber at room temperature.

2. Depress power switch to the “on” position. Depress “0” key to tare balance display.

3. Push program “start button”. Blower will turn “on”. Observe balance display reading. Display should read -3.2 to -8.2 grams. Detach the exhaust system and repeat the test to determine if the exhaust system is restricting the tester air exchange, if the initial test is out of spec or is borderline spec on the -3.5 grams low side.

The printer automatically prints a record of your furnace’s operation. When you press “Start/Stop”, the printer will print the current date, then the current time. The printer will then print spaces for recording sample identification, mix type, and tester’s name. It will then print the filter and chamber setpoints.

The printer will print a column header line “T:TEMP:WT.LOSS:%LOSS”. The columns represent elapsed minutes, main chamber temperature in °C, direct weight loss in grams, and uncorrected percentage of sample weight lost. The printer will print these values every minute during the test.

Upon completing a test by pressing “Start/Stop”, the printer will print the calibrated asphalt content, Bitumen Ratio, calibration factor, temperature compensation factor, total uncorrected percentage of sample weight lost, total weight lost in grams, initial sample weight, and total elapsed time.

If the printer runs out of paper, the test will not halt. Install a new roll while the test is running if possible. If the test is completed before a new roll is installed, press “Start/Stop” to conclude. “Prn” will be displayed in the Elapsed Time window. Load a new paper roll, and press “Enter” to print the results of the last test. You can print multiple copies by pressing “Enter” repeatedly.

The heat sensitive paper will print on only one side, and therefore, must be installed properly to function.

1. Switch furnace power on. Press the Paper Advance button to feed out any paper remaining in the printer.

2. Open the printer cover and remove retaining disk and paper roll tube.

3. Cut the lead end of the replacement paper.

4. Remove at least six inches of the lead end of the paper to remove the adhesive which secured the roll for shipping.

5. Insert the paper roll on the paper roll shaft as shown in the manual. Replace retaining disk with the raised face toward the paper roll. Ensure clips lock into retaining disk.

6. Feed the cut end of the paper into the slot at the bottom of the printer. Push the feed button on the front of the printer until about 1″ of paper comes out the front of the printer.

7. Close the cover.

In addition to being heat-sensitive, the paper tape is also light sensitive and will darken if left exposed to light for an extended length of time. To ensure long-term legibility of your records, choose one of the following methods:

1. Photocopy each day’s tapes and file the photocopy.

2. Store the tapes in an opaque folder, file or envelope.

Note that certain situations and substances will hasten the degradation of the thermal paper and should be avoided:

1. Exposure to heat or hot surfaces will darken the paper and obliterate your readings.

2. Ultraviolet light will darken the paper and obliterate your readings. Common fluorescent lights emit low levels of ultraviolet light; thermal paper tapes left exposed to fluorescent light in a lab or office will eventually darken and become unreadable.

3. Common cellophane tape interacts with the thermal paper and will darken it to illegibility. Use care if you tape your original thermal paper tapes into a notebook.

WARNINGS:

• Do not open door while program is in process. Flame and noxious fumes may be released into the laboratory. Operator will be exposed to the risk of burns. Always allow test program to reach endpoint before opening door.

• Do not load cutback asphalt samples containing naphtha, gasoline, fuel oil or explosive volatiles. Explosive ignition can occur resulting in a fire or a threat of burns to the operator.

• To avoid burns, this furnace must not be touched on the exterior or interior furnace surfaces of the chamber area (except door handle and front control panel) during use or for a period of time after use. “Hot Surface. Avoid Contact.”

• Do not use in the presence of flammable or combustible chemicals; fire or explosion may result. This device contains components which may ignite such materials.

CAUTION: Do not exceed the 5000 gram capacity. Failure to observe this caution could result in damage to furnace components and/or balance. “HHHHHH” will be displayed on the balance display if the weight limit is exceeded. If your load touches either side, the front or the back of the furnace chamber during a test, the test is invalid. Balance instability will result.

Operational Procedure:

1. Weigh your sample on an external balance accurate ±1 gram.

2. Enter sample weight into controller. Using the instructions under “To Change the Initial Sample Weight”, enter the initial weight of your sample.

3. Check and, if necessary, adjust your temperature setpoint and correction factor.

4. Load the basket assembly into the furnace chamber by inserting it directly above the hearth tray and setting gently on the hearth tray. The carrier tines of the transport handle will extend past the rear of the transport tray when locked in place. As you insert the load into the furnace chamber, allow the carrier tines of the transport handle to touch the rear wall of the furnace chamber, then gently set the load on the hearth tray. This will ensure proper placement of the load from front to back. Check the load for proper clearance on each side. Keep objects away from the thermocouple.

5. Use insulated gloves and a fire retardant apron when loading and unloading furnace. Always wear safety glasses or a safety face shield and high temperature gloves. Allow clearance for the basket tray so it will not touch the door insulation. Close the door. The furnace will not operate with the door open.

6. Press the “Start/Stop” button. The automatic locking mechanism will lock the door. After approximately five to fifteen minutes, the asphalt will ignite. You will see a sudden increase in the “Chamber Temp.” display. After the sample weight has stabilized, an audible alarm and stable light will illuminate to signal test completion and the printer will stop (if Auto Program Switching Mode is on).

7. Press the “Start/Stop” button. The automatic locking mechanism will unlock the door. Use appropriate safety apparel and tools when unloading the hot furnace. Note: The door will automatically unlock, if the Auto Program Switching Mode is on.

This feature allows you to set an automatic preheat time for your asphalt testing furnace. It is recommended to set the time for at least 2-2.5 hours before you want to begin work.

1. Press the timer button on the key pad. The heating elements will shut down. The wake up time will be displayed in the “Elapsed Time” display and the “wake-up” date will be displayed in the “Percent Loss” display.

2. Enter the “wake-up” date by inputting the month and then the day. Example: May 16th would be entered as 516. Then press ENTER. The “wake-up” date is now set.

3. You may now proceed to enter the “wake-up” time.

If at any time you wish to disable the timer, press the START/STOP button.

NOTE: If you don’t want to enter a “wake-up” date you can bypass this feature by simply pressing ENTER after you have pressed the timer button in step 1. This converts the timer to a 24-hour timer. The date needs to be set at 0.00 for this to happen.

NOTE: The timer format is European or Military time so to enter a “wake-up” time of 5:00 a.m. you would input 500 and then press ENTER. A wake-up time of 5:00 p.m. would be entered as 1700; then press ENTER.

1. Sample aggregate and sample asphalt cement are preheated to a constant weight in preparation for the standard ignition method. Failure to preheat samples will introduce inconsistent asphalt content values.

2. Cutback asphalts or slurry seals containing potentially explosive naphtha, gasoline, Kerosene or other explosive solvents must not be placed in the tester. Explosion can occur. The solvents must be reduced to a safe level prior to preheating in an oven and igniting in the tester.

3. Your tester has a rated load capacity of 5,000 grams. Splitting large samples may save time and produce improved results particularly if your test stability threshold is set at a lower value.

4. Back to back testing: Samples can be placed in the furnace at significantly lower temperature since the furnace will quickly heat to the desired temperature once the sample begins to burn. The heat from ignition will typically cause the chamber temperature to recover rapidly. This allows you to increase your daily test capacity significantly.

5. Your tester automatically compensates for the initial weight change of the load, caused by heating the load from a low temperature to a higher chamber temperature. Temperature compensation typically ranges from 0.1% to 0.25%. A warm HMA sample will be assigned a value of 0.1% or higher. A cold sample will be assigned a value near .25%. Test time will be reduced if an HMA sample is warm or hot.

Hidden Keys provide multiple uses of the keypad and are used to access infrequently changed user variables and diagnostic procedures. The furnace must be in the (non-programmable) mode to access them.

0 Key-Diagnostics: Depress the Power Switch to “ON” while simultaneously depressing the “0” key. This enters the diagnostic procedure for factory testing.

1 Key-Printout Paper Saver: Depress Power Switch to “ON” while depressing the 1 key. This toggles the intermediate printing ON or OFF.

2 Key-Default: Depress the 2 key while simultaneously depressing Power Switch to “ON”. This resets variables to factory values.

3 Key-Chamber Calibration Procedure: Depress the 3 key while simultaneously depressing Power Switch to “ON”. This allows for chamber temperature calibration using a digital pyrometer.

4 Key-Provides Entry to Balance Menus: Depress the 4 key while simultaneously depressing Power Switch to “ON”. This allows access to change time/date settings, review/adjust balance inputs, and calibrate the balance.

5 Key-Filter Temperature Adjustments: Depress the 5 key while simultaneously depressing Power Switch to “ON”. This allows adjustment of the filter temperature setpoint.

6 Key-Disables Error Codes: Depress the 6 key while simultaneously depressing Power Switch to “ON”. This temporarily inactivates ERR codes for diagnostic purposes.

7 Key-Displays Actual Filter and Chamber Temperature: Depress the 7 key while simultaneously depressing Power Switch to “ON”. This displays actual filter and chamber temperatures.

8 Key-Serial Port Output Adjustment: Depress the 8 key while simultaneously depressing Power Switch to “ON”. This toggles the serial port output between continuous (SPC) and program mode only (SPn).

9 Key-Disables Beep: Depress the 9 key while simultaneously depressing Power Switch to “ON”. This toggles the end-of-test beeper ON or OFF.

Weight Key-Prints Out Balance Variables: Depress the weight key while simultaneously depressing the Power Switch to “ON”. This prints out a list of balance variables.

Enter Key-Prints Out User Variables: Depress the ENTER Key while simultaneously depressing the Power Switch to “ON”. This prints out user variables.

Calibration Factor Key-Adjust or Check Test Stability Threshold: Depress the Calibration Factor Key while simultaneously depressing the Power Switch to “ON”. This allows adjustment of the test stability threshold (0.01-0.5%).

Temp Key-Toggles Auto/Manual Program Switching: Depress TEMP key while simultaneously depressing the Power Switch to “ON”. This toggles between Auto Program Switching to Idle and Manual Program Switching to Idle at endpoint.

Timer Key-Disables Inactivity Check: Depress the Timer key while simultaneously depressing the Power switch to “ON”. This toggles the Inactivity Check feature ON or OFF.

0 Key-Tares the Balance: Depress “0” key. The balance will automatically tare to “0” grams. Useful for the “lift test”.

Enter Key-Duplicates Header Test Results: Depress the ENTER key. Prints out the header test results for the last test.

WARNING: To avoid electrical shock, this furnace must always be disconnected from the power supply prior to maintenance and service. Ensure the main breaker on the rear panel is placed in the OFF position. Allow the furnace to cool to room temperature before performing any maintenance.

Element Plate Care: Periodically fire the chamber at 650°C for two hours in the idle mode to clean element plates. Vacuum chamber floor as needed. It is normal for refractory plates to develop hairline cracks.

Blower Maintenance: Requires cleaning and oiling the motor about every six months or if the “lift test” indicates a decline. Detach the exhaust duct, remove the top cover and fume hood. Place one drop of Anderol High Temperature Lubricant into the small oil ports on the blower motor. A 2″ wide paint brush with a vacuum cleaner can be used to clean the assembly.

Door Adjustment: Excessive air leakage around the door insulation can reduce lift values. Adjust the door fit by loosening the top and bottom hinge screws, adjusting the door, and refastening.

Door Lock Adjustment: The latch hook on the door hooks the latch pin in the closed position. The latch pin is adjustable. The two Phillips screws located above the latch pin port tighten the door’s fit when turned counter clockwise. Turn one screw a half turn, then the second screw a half turn to ensure proper latch pin position and prevent binding.

1. Disconnect furnace from power supply. Ensure the main breaker on the rear panel is in the OFF position.

2. Remove the back terminal cover of the furnace, noting the placement and connection of T/C lead wires.

3. Remove the screws on the chamber thermocouple terminals and disconnect the wires.

4. Remove the clamp retaining the thermocouple.

5. Pull the thermocouple straight back.

6. Insert the new thermocouple into the furnace and connect the leads to the terminal block, matching the wire colors with the incoming wires.

7. Secure connections with screws removed in Step 3.

8. Replace the back terminal cover.

9. Reconnect the furnace to power supply.

10. Test operation of furnace.

1. Disconnect furnace from power supply. Ensure the main breaker on the rear panel is in the OFF position.

2. Remove the back terminal cover of the furnace, noting the placement and connection of T/C lead wires.

3. Remove the screws on the filter thermocouple terminals and disconnect the filter thermocouple wires.

4. Remove the clamp retaining the thermocouple.

5. Pull the thermocouple straight back.

6. Insert the new thermocouple into the case.

7. Replace the clamp securing the thermocouple.

8. Connect the leads to the terminal block, matching the wire colors with the incoming wires.

9. Replace the back terminal cover on the furnace.

10. Reconnect the furnace to the power supply.

11. Test the operation of the furnace.

Six fuse holders are located at the rear of the lower control section. Use a medium flat-bladed screwdriver to remove the carriage from the barrel-style fuse holder. Both sides of the circuits are fused.

Fuse failure may be caused by:

1. Dielectric breakdown of insulators due to cracking, moisture pickup and contamination resulting in case to ground shorts.

2. Excessive current due to line spikes or lightning strikes.

The cause of fuse failure must be determined and resolved before installing replacements. See the “Replacement Parts” section in the manual for fuse details.

1. Disconnect furnace from power supply. Ensure the main breaker on the rear panel is in the OFF position.

2. Remove the four top screws on the front dial plate.

3. Open the front dial plate. Remove the shield which covers the door switches.

4. Disconnect the wires from the door switch to be replaced, noting the connection and placement.

5. Remove the two screws from the Microswitches.

6. Insert new Microswitch and secure with screws removed in Step 5.

7. Reconnect wires to new door switch. Replace wire shield.

8. Close front dial plate and install screws.

9. Reconnect to power supply.

10. Test operation of door switch.

1. Disconnect furnace from power supply. Ensure the main breaker on the rear panel is in the OFF position.

2. Loosen the screws which retain the door switch bracket on the bottom left side of door.

3. Move the bracket closer to furnace to make switch engage sooner. Move bracket further away to make switch engage later. Lightly tighten screws between each adjustment to hold the bracket.

4. The switches should click when the door is approximately 1″ from being completely closed.

5. Tighten screws when bracket is positioned correctly.

6. Reconnect to power supply.

7. To test the operation, turn the power switch on, set the control to a high setting, and open and close the door; the mechanical relay should be heard when the door is about 1″ from being closed.

The door lock plunger interlocks through a port at the bottom of the door. If the plunger is missing the port, realign the door by adjusting the position of the door hinge pins in the door hinge brackets.