8850-1eng 电导率表说明书(8)

GF 8850电导率表说明书

Troubleshooting

Display Condition

"- - - -"

Possible Causes

Display is over range. This may be anormal condition if your process

operates at/near the limits of the sensorrange.

Suggested Solutions

Check sensor for correct range.

Check Decimal setting in OPTIONS menu.

Check Calibrate menu settings for incompatibleSOURCE and RANGE values.

Value Must be lessthan 3The PPM factor must be a value from0.00 to 3.00

Set a PPM value less than 3.

Value must be greater than 0Custom cell constant cannot be set to 0Set cell constant to a value greater than 0

"Value must be400 or less"

Pulse Rate cannot be greater than 400Set a pulse rate value less than 400

Display erratic, shows "0" or "------" intermittently

Aux Power not connectedWire 8850 according to diagram (Section 3.1)

"Too much ErrorCheck Sensor"

Defective or dirty/coated sensorWiring error

Fluid conductivity too lowDefective temp element

Clean or replace sensor Check and correct wiring Replace sensor

Technical notes

If a Current Loop is locked at 3.6 mA, the problem is related to the temperature circuit:

This occurs only if the 8850 detects a resistance from the temperature sensor that is less than 250 or greater than 2800 . Check the sensor wiring for open/short or poor connections on white (TEMP IN) and black (ISO GND)wires. The PT1000 temperature device in the sensor is defective. The transmitter is defective.

page 10 of 12 SIGNET 8850-1 Conductivity/Resistivity Transmitter