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8. Troubleshooting
8. Troubleshooting
Fault
Possible causes
Remedy
Analog output values
- Incorrect scaling or unit
Change scaling or unit in
Unit
menu
too low/too high
No signal
- Connection interrupted
Check cables
or
- Supply voltage too low
Check power:
- Polarity incorrect
Standard plug min. 12VDC
0554.3302 plug: min. 20VDC
Signal >21mA
- Sensor defect (broken).
Sensor must be replaced.
Contact your local distributor or
Testo´s Customer Service.
Signal <4mA
- Sensor corroded
Sensor must be replaced.
Contact your local distributor or
Testo´s Customer Service.
Display
oF
- No signal from sensor
Contact your local distributor or
Testo´s Customer Service.
Displayed reading flashes
- Scaling limits exceeded
Change scaling limits in
Unit
-
S-Lo
or
S-Hi
Menu
If the fault cannot be repaired by following the suggestions given in the above table,
please contact your local distributor or Testo`s Customer service department. For
contact data, see back of this document or web page www.testo.com/service-contact
Summary of Contents for 6740
Page 1: ...Instruction manual en testo 6740 ...
Page 28: ...0970 6740 en 08 en GB ...
