Siemens SITRANS F TRANSMAG 2, Руководство по эксплуатации, Страница: 79 / 126

Troubleshooting
10
10.1 Quick sensor check-up
Resistance check
Between the sensor terminals 5 and 6, the resistance should be between 8 and 20Ω, when the
transmitter is disconnected. If the measured value is outside the recommended area, the sensor
is defective.
Isolation check
Between sensor terminal 5 and 7 as well as 6 and 7, the resistance must be ≥10 MΩ. If this is not
the case, humidity is present in the sensor. The check can also be carried out with the sensor
cable connected. If the measured values are too low, the sensor is defective.
NOTICE
Make sure the transmitter is disconnected during resistance and isolation check!
Check of electrode circuit
For sensors with SmartPLUG, the voltage must be:
• - 5.3 V DC ± 10% between terminal 22 and 29
• + 5.3 V DC ± 10% between terminal 22 and 30
This should be measured directly at the transmitter and then at the sensor.
If the measured values are too low, transmitter is defective.
If the measured values are zero or with a wrong polarity, check cable leads.
See also
If the sensor or transmitter is defective, contact your local Siemens representative:
Local contact person ( http://www.automation.siemens.com/partner )
TRANSMAG 2 with MAG 911/E
Operating Instructions, 03/2021, A5E00102775-AC
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