Emerson 396VP, 398VP, 397 Section Troubleshooting, Troubleshooting Probable Cause Remedy

MODEL 396/396VP/397/398/398VP	SECTION 5.0
	TROUBLESHOOTING

SECTION 5.0

TROUBLESHOOTING

TABLE 5-1. Troubleshooting

Trouble	Probable Cause	Remedy
Meter reads off scale. (Display	T.C. element shorted.	Check T.C. element as instructed
reads overrange.)		in Section 4.2 and
		replace sensor if defective.
	Sensor not in process or sample	Make sure sensor is in process with
	stream is low.	sufficient sample stream (refer to
		Section 2.0 for installation details).
	Open glass electrode.	Replace sensor.
	Reference element open - no contact.	Replace sensor.
Display reads between 3 and 6 pH	Electrode cracked.	Replace sensor.
regardless of actual pH of solution
or sample.
Meter or display indication swings	T.C. element shorted.	Check T.C. element as instructed
or jumps widely in AUTO T.C. Mode.		in Section 4.2 and replace
		sensor if defective.
Span between buffers extremely	T.C. element open.	Check T.C. element as instructed
short in AUTO T.C. Mode.		in Section 4.2 and replace sensor
		if defective.
Sluggish or slow meter indication	Electrode coated.	Clean sensor as instructed in
for real changes in pH level.		Sections 4.1 Replace sensor
		if cracked.
	Electrode at end of life.	Replace sensor.
Transmitter cannot be standardized.	Electrode coated or cracked.	Clean sensor as instructed in
		Sections 4.1. Replace sensor
		if cracked.
Transmitter short spans between	Electrode at end of life, due to	Replace sensor.
two different buffer values.	old glass or high temperature
	exposure.
	Coated glass.	Clean sensor as instructed in
		Section 4.1. Replace sensor
		if cracked.

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