TMT162 Trouble-shooting
Endress+Hauser 35
The sensor resistance can influence the resistance shown in the tables. On simultaneous increase of
all sensor connection cable resistances the values indicated in the tables can be divided by two.
In corrosion detection it has been assumed that this is a slow process with a continuous increase in
resistance.
9.2.2 Monitoring the supply voltage
If the required supply voltage is undershot, the analog output value drops ≤ 3.6 mA for approx. 3 s.
Error code 19 appears on the display. Afterwards, the device tries to output the normal analog
output value again. If the supply voltage remains too low, the analog output value drops again
to ≤ 3.6 mA. This prevents the device from continuously outputting an incorrect analog output
value.
9.3 Application errors without messages
9.3.1 General application errors
RTD
1)
1) Pt100 = 100 Ω at 0 °C (32 °F), Pt1000 = 1000 Ω at 0 °C (32 °F)
< ≈ 2 kΩ 2 kΩ ≈ < x < ≈ 3 kΩ > ≈ 3 kΩ
off --- WARNING ALARM
on --- ALARM ALARM
TC < ≈ 10 kΩ 10 kΩ ≈ < x < ≈ 15 kΩ > ≈ 15 kΩ
off --- WARNING
1)
1) On very high ambient temperatures a 3 x measured value deviation from the specification is possible.
ALARM
on --- ALARM ALARM
Error Cause Action/Remedy
No communication No power supply on the 2-wire circuit Connect the cables correctly according to
the connection schematic (polarity)
250 Ω communication resistor is missing See chapter 4.3.1 "HART
®
connection"
Power supply too low (<10.5 V or 8 V
without display with jumper J3)
Check power supply
Defective interface cable Check interface cable
Defective interface Check PC interface
Defective device Replace device
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