Repairs
SM/TSP/SIL-EN SensyTemp TSP 11
7.2 SensyTemp temperature sensors without transmitter
Perform quick tests of thermocouples and resistance thermometers as well as the associated
measuring circuits in the uninstalled state.
Instruments required:
• Millivolt meter
• Resistance meter or resistance bridge
• Isolation meter with 60 … 100 V voltage (all measurements at room temperature)
The following tests can be performed:
• Check opening and isolation at room temperature
• Locate wire breaks by “knocking”.
A thermocouple is regarded as functioning correctly when R < 20 Ω (wire > 0.5 mm Ø).
The value depends on the wire cross section and the length. R
isol
= 110 MΩ (with isolated
thermocouple).
A resistance thermometer is regarded as functioning correctly when R >> 110 Ω (for Pt100),
R
isol
> 100 MΩ.
• The heating of the thermocouples or resistance thermometers to approx. 200 °C to 400 °C
(without temperature controls) allows for further conclusions to be drawn about interruptions,
reversed polarity (with thermocouples), too little isolation resistance, etc.
Note
The accuracy of temperature sensors according to the ISO 9000 requirements can only be
checked by comparison with a reference element. In most cases, the deinstallation and test in
a test oven are necessary.
8 Repairs
Defective devices must be sent to ABB Service. The type of error and possible reason must
also be provided.
Use the original packaging or a suitably secure packaging for returning the device for repair or
for recalibration. Include the properly filled out return form (see attachment) with the device.
According to EC guidelines for hazardous materials, the owner of hazardous waste is
responsible for its disposal or must observe the following regulations for its shipping:
All delivered devices to ABB Automation Products GmbH must be free from any hazardous
materials (acids, alkali, solvents, etc.).
When ordering spare parts always provide the serial number of the device. This information is
located on the model plate of the original device.
Address:
ABB Automation GmbH
Service Department
Borsigstr. 2
D-63755 Alzenau
GERMANY
To Next Page
Loading...
Need help?
General
