Endress+Hauser Waterpilot FMX21, Руководство по эксплуатации

Страница: 76 / 144

Diagnostics and troubleshooting Waterpilot FMX21
76 Hauser
Code: S841
• Description: Sensor range
• Cause:
• Overpressure or low pressure present
• Sensor defective
• Corrective measure:
• Check the pressure value
• Contact Hauser Service
Code: S971
• Description: Adjustment
• Cause:
• The current is outside the permitted range 3.8 to 20.5 mA
• The present pressure value is outside the configured measuring range (but may be
within the sensor module range)
• The adjustment performed would cause the sensor nominal range to be exceeded or
undershot.
• Corrective measure:
• Check the pressure value
• Check the measuring range
• Check the setting
10.3 Troubleshooting specific to the device with optional
Pt100
No measuring signal
• 4 to 20 mA cable not connected correctly
 Connect device as per →  25
• No power supplied via the 4 to 20 mA cable
 Check current loop
• Supply voltage too low (min. 10.5 V
DC
)
 Check supply voltage
 Overall resistance greater than max. load resistance
• Device is defective
 Replace the device
Temperature measured value is inaccurate/incorrect (only for device with Pt100)
Pt100 connected in 2-wire circuit, cable resistance was not compensated for, cable not
correct
 Compensate for the cable resistance
 Connect Pt100 as 3-wire or 4-wire circuit
10.4 Troubleshooting specific to TMT72 temperature head
transmitter
No measuring signal
• 4 to 20 mA cable not connected correctly
 Connect device as per →  25
• No power supplied via the 4 to 20 mA cable
 Check current loop
• Supply voltage too low (min. 10.5 V
DC
)
 Check supply voltage
 Overall resistance greater than max. load resistance