Omega CDTX-90 manual Troubleshooting

Page 17

Parts Per Million (PPM) Factor

This feature is only applicable when PPM display units are selected. The programmable PPM Factor is adjustable from 0.01 to

3.00(factory default = 2.00). Determine the best PPM Factor for a process solution by calculating the solution's conductivity (S) and the percent of total dissolved solids (PPM).

PPM Factor =

Solution conductivity (S)/cm

Total dissolved solids (PPM)

 

TDS (PPM) =

Solution conductivity (S)/cm

 

PPM Factor

 

 

Example:

• Solution conductivity = 400 S/cm

 

• TDS = 200 PPM (mg/L)

PPM Factor =

400 S/cm = 2.00

 

 

200 PPM

Troubleshooting

Display Condition

Possible Causes

Suggested Solutions

 

 

 

 

 

 

"- - - -"

Display is over range. This may be a

Check sensor for correct range.

 

normal condition if your process operates

Check Decimal setting in OPTIONS menu.

 

at/near the limits of the sensor range.

Check Calibrate menu settings for incompatible

 

kor Munits selected & sensor is open.

SOURCE and RANGE values.

 

 

 

 

 

 

Value Must be less

The PPM factor must be a value from

Set a PPM value less than 3.

than 3

0.00 to 3.00

 

 

 

 

 

 

 

Value must be greater than 0

Custom cell constant cannot be set to 0

Set cell constant to a value greater than 0

 

 

 

 

 

 

"Value must be

Pulse Rate cannot be greater than 400

set a pulse rate value less than 400

400 or less"

 

 

 

 

 

 

 

 

Display erratic, shows "0" or

Auxiliary Power not connected

Connect Auxiliary power

"------" intermittently

 

 

 

 

 

 

 

 

"Too much Error

Defective or dirty/coated sensor

Clean or replace sensor

Check Sensor"

Wiring error

Check and correct wiring

 

Fluid conductivity too low

 

 

Defective temp element

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 CDTX-90 detects a resistance from the temperature sensor that is less than 250or 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.

Auxiliary Power (terminals 1 and 2) must ALWAYS be connected for the CDTX-90 to operate.

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Contents User’s Guide Internet e-mail info@omega.com Specifications InstallationSensor Connections Electrical Connections Sensor SelectionCDTX-90-1 Terminal connections CDTX-90-1 System Power/Loop ConnectionsTerminals 5-10 Relay Outputs CDTX-90-2 Terminal ConnectionsCDTX-90-3 Terminal Connections Terminals 3-6 Loop PowerLoop Output Loop 2+ System Pwr Loop System Pwr Output Loop +CDTX-90 Series View Menu Step Made an Error?Finished Editing? CDTX-90-1 Calibrate Menu Contrast CDTX-90-1 Options MenuCDTX-90-2 Calibrate Menu CDTX-90-2 Options Menu CDTX-90-3 Calibrate Menu CDTX-90-3 Options Menu Settings will repeat for Loop 2 and OutputCalibration with Nist Traceable Solutions Calibration ProcedureTemperature Coefficient RequirementsTroubleshooting Page WARRANTY/DISCLAIMER OMEGA…Of Course