What to do if JUMO 902020/10 display an incorrect measured value?
If your JUMO Measuring Instruments are showing an incorrect measured value, it may be influenced by an additional heat source. To fix this, optimize the installation situation. It could also be that the measuring circuit is interrupted by vibrations. To solve this, change the installation location, use vibration-damping measures, or modify the design.
What to do if JUMO Measuring Instruments display data that is too high or too low by a fixed amount?
If the data displayed on your JUMO Measuring Instruments is off by a fixed amount, the issue might be an incorrect cold junction temperature. To resolve this, acquire the correct cold junction temperature.
What to do if JUMO 902020/10 display data that is much too high or much too low?
If the data displayed on your JUMO Measuring Instruments is much too high or low, it could be due to an incorrect linearization in the indicating device. In this case, you should change the linearization. Another cause could be an incorrect compensating cable or incorrect polarity of the connection, so replace the compensating cable or change the polarity.
Why is the temperature indicator too low on JUMO 902020/10?
If the temperature indicator on your JUMO Measuring Instruments is too low, it could be due to poor-quality insulation resistance or drift caused by moisture. In this case, carry out an insulation test and, if necessary, improve the insulation or replace the probe.
How to troubleshoot differing temperature indicators on JUMO Measuring Instruments?
If you're experiencing differing temperature indicators on your JUMO Measuring Instruments, it could be because the power supply is not constant. Replace the power supply unit to resolve this. Another cause might be a two-wire circuit with fluctuating temperature in the area of the supply line, so switch to a three-wire circuit.
What to do if the temperature indicator is too low on JUMO 902020/10 Measuring Instruments?
If the temperature indicator on your JUMO Measuring Instruments is too low, it could be because the resistance of the measuring circuit is too high relative to the input resistance of the device. To fix this, select a device with a high input resistance.
What to do if the displayed temperature is much too high or drifts on JUMO 902020/10?
If the displayed temperature on your JUMO Measuring Instruments is too high or drifts, it could be due to incorrect polarity of the compensating cable in the terminal head. Change the polarity to correct this. Alternatively, it might be due to incorrect compensating cables, so replace the compensating cable.
General| Control Mode | ON/OFF, PID |
|---|---|
| Operating Temperature | -10 to +55 °C |
| Input | Thermocouples, RTDs |
| Output Signal | Relay |
| Output | 4-20 mA, 0-10 V |
| Display | LED or LCD |
| Power Supply | 110 to 240 V AC, 24 V DC |
| Protection Class | IP65 (front) |
| Housing | Plastic |
Details safety warnings, symbols (danger, caution, note), and documentation requirements.
Explains the proper and intended use of JUMO thermometers and manufacturer liability.
Provides an overview of the manual's scope and supplementary literature.
Guides on identifying the device version using nameplates and labeling examples.
Describes the construction of RTD probes, including components like protection tubes and terminal heads.
Explains the resistance change principle of RTD sensors with temperature.
Details different RTD sensor types, such as thin-film and wire-winding.
Covers tolerance classes and validity ranges for RTD sensors as per DIN EN 60751.
Explains two-wire, three-wire, and four-wire circuits for RTD probes and their impact.
Describes the construction of thermocouples, including thermal wires and protection tubes.
Explains the Seebeck effect, the basis of thermocouple operation.
Lists standardized thermocouple types, their limits, and specifications according to DIN standards.
Discusses symptoms like green rot and structural changes in Type K thermocouples.
Details materials, insulation, and shielding for RTD probe connection lines.
Covers thermal and compensating cables for thermocouples, including identification marking.
Shows examples of various cable ends and connectors used with thermometers.
Provides guidance on the proper transport and storage of thermometers.
General instructions and key technical data considerations before mounting thermometers.
Offers advice on selecting installation sites and ensuring correct probe alignment for accurate readings.
Details specific mounting and tightening torques for screw-in type thermometers.
Focuses on the importance of welded joint quality for welded-stem thermometers.
Provides handling instructions for mineral-insulated probes, including bending guidelines.
Outlines mounting procedures for surface probes to ensure accurate surface measurements.
Addresses unique installation challenges like condensate prevention and vibration mitigation.
Details electrical connection procedures, including terminal assignments and polarity checks.
Presents a startup checklist for verifying thermometer functionality and correct installation.
Recommends periodic checks for functionality and insulation resistance of thermometers.
Covers safety precautions and procedures for the safe removal of thermometers from their installation.
Illustrates connection types and terminal assignments for RTD probes and thermocouples.
Lists common thermocouple errors, their causes, and recommended remedies.
Details common RTD probe errors, their causes, and corrective actions.
Covers general errors, causes, and remedies applicable to all thermometer types.
States that RTD probes and thermocouples need no maintenance, but checks are advised.
Provides guidelines for cleaning thermometers, emphasizing caution to avoid damage.
Includes warnings and information related to product returns.
Outlines procedures for the safe and environmentally friendly disposal of thermometers.
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