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

MODEL 396/396VP/397/398/398VP

SECTION 5.0

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.