Electrode Voltage Test - ABB COPA-XM 3000 Series Instruction Manual

Series 10DX3000 Magnetic Flowmeter Instruction Manual

5.3.2.3 Electrode Voltage Test

This test may only be performed on remote models (10DX3111E). If no erroneous readings are found
when the electrode resistance test is performed, an additional test may be performed with the system
powered and the field wiring restored. Use a digital voltmeter, with a range-setting of 20VDC, to
measure the voltage between electrode terminals 1 & 3 (common) and between electrode terminals
2 & 3. The voltage readings should be between +10 mV and +2 VDC and should not differ by more
than 0.4 VDC. If measured voltages are outside of these ranges, it may indicate that an electrode is
open, shorted or that the process fluid is non-conductive.
NOTE
Model 10DX3311E flowmeters with integrally mounted signal Converters in-
corporate a buffer preamplifier for each electrode. Since this preamplifier is
also encapsulated, an on-site evaluation of the condition of the electrodes
is not possible.
If the results of the procedures in Sections 5.3.2.1 through 5.3.2.3 indicate normal meter parameters,
the flowmeter may be returned to service.
Refer to the instruction manual supplied with the Signal Converter for additional advice on trou-
bleshooting flowmeter electronics.
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