HERAEUS M 110 (01) PDF Document

To ensure the safety of personnel, the environment, and samples, it is of paramount importance that the operator uses the HERAEUS M 110 correctly. To avoid errors and damage, especially personal injuries, read the manual before use and follow all instructions.

Prohibited Uses:

• The unit is not to be used to heat foods.

• The unit is not to be used for drying or heat treatment of substances which release gases or vapours that are flammable or dangerously explosive when mixed with air.

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

Operational Warnings:

• Metal surfaces around the mouth of the furnace become hot at high operating temperatures. There is a DANGER OF INJURY. Avoid contact with these surfaces.

• Special measures must be taken during external temperature measurement to ensure protection from electric shocks.

• Exhaust gases from heat treatments must be safely conducted out of the room. Observe all applicable environmental protection regulations.

• Export versions of the unit without over-temperature protection systems may only be operated under constant observation.

Equipment Checks and Maintenance:

• Test the mains supply cable and connecting plug for defects before use. Do not connect the unit if defects are detected.

• The voltage on the nameplate must match the voltage of the mains power supply.

• The door-operated safety switch must be tested at regular intervals (at least once per year).

• The over-temperature protection system must be functionally tested at appropriate intervals (at least every 3 months), and its electrical functions tested at least once each year.

• Work on electrical components may only be carried out by authorized service personnel with the unit disconnected from the mains power supply.

• Use only authorized replacement parts. Using other parts can present unforeseeable risks.

The HERAEUS M 110 muffle/chamber furnace is designed for thermal technology applications in the laboratory.

• Volume of furnace: 9 l

• Heat treatment of samples and objects from 300°C to 1100°C

• Loads of up to 5 kg

It is generally designed for installation and operation in laboratories, such as those found in manufacturing trades and industry, schools, universities, hospitals, and biology.

Specific uses include:

• aging

• analysis

• tempering

• decomposing

• baking

• annealing

• hardening

• soldering

• oxidizing

• reducing

• incineration

• preheating

The unit is designed for continuous operation. The optional over-temperature protection “upper limit cut-out” enables operation without constant supervision.

The upper limit cut-out (TWB) should be periodically tested (at least every 3 months) to ensure it is functioning properly.

Functional Test Procedure:

1. Precondition: The temperature set on the temperature controller has been reached and remains constant.

2. Using a tool like a coin or screwdriver, adjust the TWB setting to approx. 50°C below the temperature currently displayed on the temperature controller.

3. The TWB should activate, and the red “malfunction” display light will illuminate. This confirms the TWB is functioning properly.

4. After the test, reset the TWB to the desired temperature limit for your application.

Note: The unit must be reset manually using the key (deactivation of over-temperature protection symbol) after it has cooled down.

If the “malfunction” light is indicated during normal operation, check the settings of the TWB and the temperature controller. If the malfunction persists, contact the service department.

The Digicon® temperature controller displays and adjusts temperature in increments of 10°K.

To use the Thermicon® P controller without programming functions, ensure you enter “Pr = 0” to switch off the programming operation.

This example shows how to switch the unit on after 6 hours to heat the chamber to 800 °C.

Note: The unit must remain turned on for the timer to function.

This example shows how to switch the unit off after 6 hours of operation at 800 °C.

Note: If no timer function is required, select “tf 0” and enter the time “00.00”.

The controller can execute programs of up to 9 steps. This example shows how to set up a 5-step program.

Step 1: Enter Programming Mode

Step 2: Define Program Steps

Note: The program is retained in memory during power failures but must be restarted manually once power is restored.

Location and Placement:

• Place the furnace in a stable and perfectly upright position on a firm, fireproof surface (e.g., laboratory table or support frame).

• It is not possible to stack the furnaces.

• The room temperature can be up to 40°C.

• Do not cover or obstruct the ventilation or exhaust vents of the unit.

Distance from Other Surfaces and Objects:

• Left side: 300 mm (30 cm)

• Right side: 100 mm (10 cm)

• Top: 400 mm (40 cm)

• Rear (with spacer): 25 mm

• Min. rear spacing to wall: 10 cm

Room Ventilation:

• Proper ventilation must be installed where the unit is set up. Do not operate in non-ventilated, enclosed spaces.

• Special ventilation measures are required when several units are set up in the same room.

• The unit is powered via a permanent flexible mains power cable and a grounded plug.

• Before use, test the mains supply cable and connecting plug for any faults. Do not connect the unit if faults are detected.

• The voltage specified on the nameplate must match the voltage delivered by the mains power supply.

• Only plug the furnace into a properly installed outlet equipped with a PE conductor (Protection Class 1).

• The mains power circuit should additionally provide protection against electric shocks caused by leakage current.

• Mains circuit protection required: T 16 A fuse or B 16 circuit break-switch.

• For any required power extensions, use a rubber-sheathed flexible cable of at least 1.5 mm diameter (H 07 RN-F).

There is an aperture (5 mm dia.) in the middle of the swivel door that serves as an access for shielded thermocouples to provide external measurement of temperatures inside the furnace chamber.

IMPORTANT SAFETY INSTRUCTIONS:

• To avoid damage to temperature measurement devices, only connect them to power circuits that are entirely independent of the mains power supply (FRG: DIN VDE 0100 Section 410).

• To ensure protection against electric shock, only shielded thermocouples which are properly connected to the PE conductor are to be placed through this aperture.

• Due care must be taken to ensure that the thermocouple does not come into contact with the walls of the furnace.

• An additional leakage current flows over the thermocouple shield. Under unfavourable conditions, the sum of all leakage currents can activate the leakage current protection switch. It is recommended to connect the furnace to a separate leakage current protection switch (rated at ≤ 30 mA).

After setting up and installing the unit, proceed as follows to start the unit:

• Wear required personal safety clothing to protect hands, face, and body; remove jewellery.

• To avoid overheating heat-conducting samples, distribute them evenly throughout the furnace chamber and do not place them too close to the heating elements.

• Take care not to damage the heating elements when loading samples.

• Avoid any direct contact of aggressive chemicals with the ceramic and fibre material surfaces inside the chamber, as soiled surfaces can cause premature damage to insulation and heating.

• Limit operation of the furnace at its highest temperatures only as long as required to complete the task, as the life of the heating coils is highly dependent on the temperature load.

• If used often, it is best to run the unit in continuous operation at medium temperatures, as continually heating and cooling over a large range can adversely affect the unit’s life.

• Do not cover the ventilation and extraction vents on the outside of the unit, and keep them clean and clear of objects.

Follow these steps to shut down the furnace:

1. Remove samples loaded into the furnace chamber.

2. Wait for the furnace and room temperatures to cool down.

3. Turn off the unit. If it is not used for a longer period, disconnect it from the mains and pull out the plug.

4. Clean out the furnace chamber.

The unit requires very little maintenance.

Cleaning:

• The bearings of the swivel door can be lubricated with graphite oil.

• Clean the outer surfaces and control elements with a mild detergent and a soft cloth.

• Clean away any spillage or residue from the furnace chamber.

• If the unit is connected to an extraction system, the exhaust ducts should be part of the cleaning procedures.

Testing:

To ensure the unit remains in proper working condition, it should be tested at least once a year for the following:

• Mechanical functions

• Function according to technical specifications

• Electric circuits (FRG: UVV VBG 4)

• Safety equipment installed in the unit

MECHANICAL SPECIFICATIONS

THERMAL SPECIFICATIONS

VENTILATION / EXHAUST GASES SPECIFICATIONS

ELECTRICAL SPECIFICATIONS

¹ Fibre materials used for insulation are classified as hazardous to health in certain countries. No serious risks to the working environment arise from normal operation. Improper handling during repairs or dismantling the unit can lead to significant levels of contamination.