Electrodes; Electrode Disassembly, Inspection And Replacement - ABB 10DX3111G Instruction Manual

Magnetic flowmeter sizes 30" through 78"

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4.3.2 Electrodes

To check for problems with the electrodes do the following:

1) Power down.

Do not inspect electrodes unless pipe is de-pressurized and drained.

2) With an empty and dry meter pipe, remove the electrode connections from the terminal

board in the Converter/Driver or from the terminals in the conduit box (accidental submer-

gence meters only). Check for possible continuity first from terminal "1" to the meter hous-

ing and then from terminal "2" to the meter housing. No continuity whatsoever should be

detected for proper operation.

3) If continuity is detected, check for stranding shorts about terminals "1", "2" and "3" in

the conduit box of accidentally submersible meters, or about terminals 1, 2B and 2C in the

Converter/Driver for continuously submersible meters. Also check the possibility of a short

in either electrode assembly (the standard electrode assembly is shown in Figure 4-1).

Condensate in an electrode assembly may cause a high resistance ground which can be

remedied by partial disassembly and exposure with infra-red bulb or by packing with a des-

iccant. (The procedure for electrode disassembly is described in 4.3.4.) If the electrode

short cannot be eliminated (either in the area of the terminal boards or wiring), the meter

must be replaced.

4) If all components prove reliable, restore internal wiring interconnections. If the meter

does not function properly after reconnection, contact your local ABB Instrumentation Field

Representative.

Standard and bullet-nosed electrodes may be inspected and replaced in Model 10DX3111 Mag-

netic Flowmeters without removal of the meter from the pipeline.

Do not attempt electrode inspection or replacement with a filled or

pressurized pipeline. Personal injury may result from such practice.

Unless specified otherwise at the time of purchase, meters are equipped with stainless steel elec-

trodes.

10DX3111 INSTRUCTION MANUAL

WARNING

4-3

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