AZBIL JTD720A (01) PDF Document

Correct installation and periodic maintenance are essential for the safe use of your AZBIL JTD720A. Before starting installation, operation, or maintenance work, please read and understand the following safety instructions:

Inspection on Delivery:

• Make sure the specifications are correct and check for any damage that may have occurred during transportation.

• If you find any problem with the quality specifications, contact an Azbil Corporation representative immediately, providing the model name and serial number. The nameplate is mounted on top of the enclosure.

Installation Warnings:

• When installing the transmitter, ensure that the transmitter’s gaskets do not protrude from the process connection parts, such as flanges contacting the process pipes.

• Never use the transmitter in applications outside the rated pressure or temperature range. Always observe connection specifications. Damage to the transmitter, or leakage, may endanger the plant, equipment, or human safety.

• In areas designated as explosion-proof, apply the methods specified in the explosion-proofing guidelines to any cabling work.

Installation Cautions:

• After installation, do not step on the transmitter, as this may damage it or cause physical injury.

• The glass indicator may break if hit with a tool or other object, causing physical injury.

• Install the transmitter correctly. Incorrect installation may lead to output errors or violate applicable regulations.

• The AZBIL JTD720A is heavy. During installation, ensure that your footing is safe and always wear safety shoes.

WARNING: To avoid electric shocks, dry your hands completely before performing wiring work and turning the power OFF. It is recommended to wear gloves over dry hands.

CAUTION:

• Before startup, study the specifications carefully and ensure that the wiring is correct. Wiring errors may cause hardware damage or other malfunctions.

• Provide a power supply that matches the specifications of the transmitter. An incorrect power supply may cause hardware damage.

WARNING:

• Before disconnecting the transmitter from the process for any reason, including maintenance, wait for residual pressure, fluid, or gas to reach safe levels. Exercise extreme caution to avoid fluid eruption.

• Prevent burns. Check the venting or draining direction and keep plant personnel out of the way of vented gas or drained fluid.

• When operational, never open the cover in an explosion-proof area to avoid explosions or other combustion accidents.

CAUTION:

• Strict product controls were exercised during the manufacture of this transmitter. Never modify the transmitter in any way. In-plant modifications may result in damage to the transmitter or to property and human safety.

Yes, you should avoid using communication equipment near the AZBIL JTD720A transmitter. Interference from equipment such as a transceiver, a cellular phone, a PHS, or a beeper may result in a malfunction at some transmission frequencies. Observe the following precautions:

• Check in advance of using any such equipment for the clearance required to ensure safe operation of the transmitter.

• When using communication equipment, always maintain a distance at least equal to this required clearance between the communication equipment and the transmitter.

• Always close the transmitter cover before using communication equipment.

Unpacking the transmitter:

The AZBIL JTD720A is precision equipment. Handle it carefully to prevent accidents and damage.

Checking accessories:

The package includes the main unit of the transmitter and one 3-inch, L-shaped wrench.

Checking specifications:

The specifications are marked on the transmitter nameplate and should match your order. Check the following:

• Tag No. (TAG No.)

• Model No. (MODEL)

• Production No. (PROD No.)

• Low and high limits of set range (RANGE)

• Supply voltage (SUPPLY)

• Explosion-proofing conformance (mark is applicable only to explosion-proof models)

Storage:

Storage over long periods requires special procedures to avoid damage. Always store the transmitter:

• Indoors and at normal temperature and humidity.

• In a location subject to minimum vibrations and shocks.

• Before unpacking, not after.

For use in hazardous areas, a cable gland that is approved by NEPSI and complies with GB/T 3836.1-2021 and GB/T 3836.2-2021, with an explosion-proof grade of Ex db IIC Gb, must be used for conduit openings. The thread specification of the conduit opening is 1/2-14NPT or M20×1.5-6H. The use of the cable gland must comply with the requirements outlined in its instruction manual, and any unused conduit openings must be effectively sealed with a plugging piece.

The AZBIL JTD720A has six operation modes, as described in the table below.

Note: For calibration, use a sufficiently accurate input signal. Attempting calibration with a value more than 3% off may exhibit symptoms similar to a non-critical error.

Select a location that meets the following conditions for optimal performance:

• Temperature fluctuations should be as small as possible.

• Avoid installing in locations exposed to radiated heat from other plant equipment.

• Insulate against freezing in the measured fluid or sealing liquid.

• Select a location where shocks and vibrations are as small as possible.

• Avoid installing in corrosive atmospheres.

• For models with an external zero-adjustment function, install at least 1 meter away from equipment producing strong magnetic interference (over 10 gauss), such as a motor or pump, to prevent output fluctuations.

First, prepare the following items:

• 2-inch pipe

• Mounting bracket (U-bolt, nut, mounting bolt) (Optional)

The transmitter can be installed using one of two methods:

1. Installation with pipe stanchion: Fix the transmitter to a vertical or horizontal 50 mm pipe with a U-bolt using a mounting bracket. Mount the transmitter on the bracket using the four bolt holes on the reverse side of the pressure-receiving part.

2. Installation by line mounting: This method also involves fixing the transmitter to a 50 mm pipe. Provide equipment to connect the 2-inch pipe to the line pipe.

In both cases, fix the pipe firmly to the foundation and make sure it is stable. The sequence of assembling the transmitter, bracket, and 2-inch pipe depends on the installation direction.

It is best to install the transmitter main unit with the pressure-receiving diaphragm set vertically. After installation, perform a zero point calibration using the following procedure:

1. Fix the high pressure and low pressure side diaphragms at the same height and make sure that the input pressure to the transmitter is uniform (equalized).

2. Using model CFS100 communicator, check the output of the device. If the output is not zero, adjust the zero point.

The up/down position of the process connection port can be changed. To change the position from the bottom to the top, follow this procedure:

1. Remove the four bolts that hold the two adapter flanges.

2. Remove the two vent/drain plugs from the top.

3. Attach the two adapter flanges to the top of the device with bolts. Tighten the bolts to the specified torque:

4. Apply seal tape around the threads of the two vent/drain plugs and spray lubricant.

5. Screw the vent/drain plugs into the bottom of the device. Tighten the plugs to the specified torque of 5 ± 0.3 N·m.

Use the same procedure, with necessary changes, when moving the connection port from the top to the bottom.

To connect a communicator to the AZBIL JTD720A, wire the communication cables to the transmitter terminals as follows:

• Red cable: Supply + terminal

• Black cable: Supply – terminal

Note: External load resistance must be at least 250 Ω for the communication to work.

CAUTION: If the transmitter uses SFN communication while the process is in the automatic control state, the output may fluctuate. Before performing this operation, be sure to switch the control loop of the process to manual control.

Using the Field Communication Software (e.g., CommStaff), follow these steps to input or change the Tag Number:

1. In the menu tree, select [Device Setup] → [Basic setup] → [Tag].

2. Double-click “Tag” to open the settings screen.

3. On the settings screen, enter the new Tag number and click the “Set” button.

4. Click the “Send” button to send the new Tag to the transmitter.

To switch between linear and square root output, follow these steps using the communication software:

1. Select [Device Setup] → [Detailed setup] → [Signal Condition] → [Conformity].

2. Double-clicking [Conformity] will display a dialog box.

3. Select “Linear” or “Sq root” from the options.

4. After selecting, click the button. After the dialog box closes, click the button.

Important Points:

• WARNING: When clearing vents and drains, check the direction in which material will come out to avoid contact with the human body. If the process fluid is harmful, take safety measures such as wearing goggles or a mask.

• CAUTION: Check that the process is in manual control mode. Before starting, ensure the differential pressure outlet valves (master valves), drain valves, gas vent plugs, and the stop valve of the three-way manifold are closed on both high and low pressure sides. Also, check that the equalizer valve of the three-way manifold valve is open.

Procedure for Introducing Process Pressure:

1. Open the high and low pressure side master valves and introduce process fluid into the connecting pipe. If the process temperature is high, wait for the connecting pipe to cool down.

2. Fill the pressure-receiving part of the device with process fluid by gradually opening the stop valve on the high pressure side. Once filled, close the valve.

3. Set the differential pressure to zero by gradually opening the equalizer valve. Then, gradually open the high pressure side stop valve to introduce process pressure, achieving an equalized pressure state.

4. Check for any pressure leaks in the connecting pipes, the three-way manifold valve, and the device itself.

Zero Point Check and Calibration:

1. Check that the equalized pressure state from the previous step was attained.

2. Using the communicator, check the device output. If it is not zero, calibrate the zero point.

Follow this procedure to apply the differential pressure of the process to the device:

1. Check that the valves of the three-way manifold are in the following state:

• High pressure side stop valve: fully open

• Low pressure side stop valve: fully closed

• Equalizer valve: fully open

2. Introduce process pressure into the low pressure side:

• Close the equalizer valve.

• Gradually open the low pressure side stop valve.

After applying pressure, use the communicator to check the measured values. Once checked, disconnect the communication cable, attach the device’s case cover securely, and switch the process to normal operation.

To stop the operation of the AZBIL JTD720A, carry out the following procedure:

1. Turn off the power to the device.

2. Operate the valves of the three-way manifold valve in the following order:

a. Close the low pressure side stop valve.

b. Open the equalizer valve.

c. Close the high pressure side stop valve.

3. Close the high and low pressure side master valves.

Cautions for stopping operation:

• If operation will be stopped for a long period, remove the process fluid from inside the connecting pipes and the pressure-receiving part of the device to prevent it from impeding measurement when operation resumes.

• Leave the equalizer valve open. If it is left closed, an output other than zero can occur when power is turned on to restart operation.

Detachment:

To detach the main unit cover, remove the four sets of nuts and bolts that fasten it. CAUTION: After detaching the main unit cover, be careful not to scratch the diaphragm.

Attachment:

When attaching the main unit cover, fasten the bolts to the appropriate tightening torque. If the seal gaskets are damaged, replace them with new ones. Use the torques specified in the table below.

To maintain performance, the transmitter and pipes should be thoroughly cleaned. Sediment in the pressure chamber can cause measurement errors. Follow this procedure to clean the main unit:

1. Remove the bolts and nuts, and detach the main unit cover.

2. Clean the diaphragm and the inside of the main unit cover using a soft brush and solvent. Be careful not to deform or scratch the diaphragm.

3. During re-assembly, replace cover gaskets with new ones as necessary.

4. Fasten the bolts and nuts to the prescribed fastening torque.

If operating in a cold area where water may freeze, remove water from the main unit by loosening the drain plugs.

The measurement range must be calibrated at two points: the Lower Range Value (LRV for 0% output) and the Upper Range Value (URV for 100% output). CAUTION: If the process is controlled automatically, switch the control loop to manual mode before proceeding.

1. Using the communication software, select [Device Setup] → [Diag/Service] → [Calibration] → [Correct Input].

2. First, double-click “DP Range Values” to check and, if necessary, change the values for DP LRV and DP URV.

3. To calibrate the LRV, double-click “Correct DP LRV”. To calibrate the URV, double-click “Correct DP URV”. Always calibrate the LRV first if changing both.

4. A series of warning messages will appear. Acknowledge them to proceed (e.g., “Loop should be removed from automatic control,” “This will affect sensor calibration”).

5. When prompted to “Set DP Mode,” click [OK].

6. The software will display “Apply DP LRV pressure” or “Apply DP URV pressure.” Apply the correct pressure using a standard pressure generator, and then click [OK].

7. When the software displays “Press OK when pressure is stable,” confirm the input pressure has stabilized and click [OK].

8. A success message like “[Correct DP LRV succeeded]” will be displayed. After clearing the mode, a note will indicate that the loop may be returned to automatic control.

For a simple zero trim with equalized pressure, select “DP Zero Trim” and follow the prompts, applying zero differential pressure when instructed.

If the transmitter does not operate, or operates erroneously, check the items in the table below. If the situation does not improve, stop using the device, turn off the power, and contact a service representative.

In addition, check the following:

• Self-diagnostics results using the communicator.

• Whether there are leaks in the pipe connectors.

• Whether the product side bolt fasteners are loose.

• Whether any pipes are loose or disconnected.

• Whether the power supply voltage, load resistance, etc., are in accordance with the specifications.

• Whether the pressure and temperature are in accordance with the specifications.

• Whether there are any strong sources of magnetism or electrical noise nearby.

You can check self-diagnostic messages by clicking the Status icon in the communicator’s display menu. The messages, their meanings, and required actions are listed below.