electrodes, 18 and 19, are on opposite sides in the inside diameter of the sensor. If
applicable, the third process reference electrode is between the two measurement
electrodes.
The expected values in the test below assume the measurements have been taken directly
at the pins.
Table 12-13: Test A. Terminal to front electrode
Test conditions Expected
value
Potential cause Corrective action
• Location: uninstalled
• Required equipment:
Multimeter
• 18 and electrode 18
(1)
≤ 1 Ω • Shorted electrode
• Open electrode
• Coated electrode
• Replace sensor
• Remove coating from sensor
wall
(1) When the connection head is in the vertical upright position and the flow arrow (see Flow direction) on the connection
head flange points to the right, the front of the meter will be facing towards you. Electrode 18 is on the front of the
meter. If you cannot determine the front of the meter, measure both electrodes. One electrode should result in an open
reading, while the other electrode should be less than 0.3 ohm.
Table 12-14: Test B. Terminal to back electrode
Test conditions Expected
value
Potential cause Corrective action
• Location: uninstalled
• Required equipment:
Multimeter
• 19 and electrode 19
(1)
≤ 1 Ω • Shorted electrode
• Open electrode
• Coated electrode
• Replace sensor
• Remove coating from sensor
wall
(1) When the connection head is in the vertical upright position and the flow arrow (see Flow direction) on the connection
head flange points to the right, the front of the meter will be facing towards you. Electrode 18 is on the front of the
meter. If you cannot determine the front of the meter, measure both electrodes. One electrode should result in an open
reading, while the other electrode should be less than 0.3 ohm.
Table 12-15: Test C. Terminal to reference electrode
Test conditions Expected
value
Potential cause Corrective action
• Location: uninstalled
• Required equipment:
Multimeter
• 17 and process reference
electrode
(1)
≤ 0.3 Ω • Shorted electrode
• Open electrode
• Coated electrode
• Replace sensor
• Remove coating from sensor
wall
(1) Only valid if the sensor has a process reference electrode.
Reference Manual Troubleshooting
00809-0100-8782 November 2019
Reference Manual 145
To Next Page
Loading...
