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Display Condition

Suggested Solutions

Possible Causes

"- - - -"

Value Must be less
than 3

Value must be greater than  0

"Value must be
400 or less"

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

"Too much Error
Check Sensor"

Display is over range.  This may be a
normal condition if your process operates
at/near the limits of the sensor range.
k

 or M

 units selected & sensor is open.

The PPM factor must be a value from
0.00 to 3.00

Custom  cell constant cannot  be set to 0

Pulse Rate cannot be greater than 400

 Auxiliary Power not connected

Defective or dirty/coated sensor
Wiring error
Fluid conductivity too low
Defective temp element

Check sensor for correct range.
Check Decimal setting in OPTIONS menu.
Check Calibrate menu settings for incompatible
SOURCE and RANGE values.

Set a PPM value less than 3.

Set cell constant to a value greater than 0

set a pulse rate value less than 400

Connect Auxiliary power

Clean or replace sensor
Check and correct wiring

Replace  sensor

Troubleshooting

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 (

µ

S)

and the percent of total dissolved solids (PPM).

PPM Factor  =

  Solution conductivity (

µ

S)/cm  

  Total dissolved solids (PPM)

TDS (PPM)  =

Solution conductivity (

µ

S)/cm

             PPM Factor

Example:

•  Solution conductivity = 400 

µ

S/cm

•  TDS = 200 PPM (mg/L)

PPM Factor =

  400 

µ

S/cm   = 

 2.00

   200 PPM

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 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.

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

Technical notes

Summary of Contents for CDTX-90 Series

Page 1: ...www omega com e mail info omega com User sGuide Shop online at CDTX 90 Series Conductivity Resistivity Transmitters Conductivity Resistivity 62 50 uS cm 25 0 C ENTER ...

Page 2: ...stomer Service 1 800 622 2378 1 800 622 BEST Engineering Service 1 800 872 9436 1 800 USA WHEN TELEX 996404 EASYLINK 62968934 CABLE OMEGA Mexico En Español 001 203 359 7803 e mail espanol omega com FAX 001 203 359 7807 info omega com mx Servicing Europe Benelux Postbus 8034 1180 LA Amstelveen The Netherlands TEL 31 0 20 3472121 FAX 31 0 20 6434643 Toll Free in Benelux 0800 0993344 e mail nl omega ...

Page 3: ...g temperature 10 to 70 C 14 to 158 F Storage temperature 15 to 80 C 5 to 176 F Relative humidity 0 to 95 non condensing Maximum altitude 2000 m 6562 ft Insulation category II Pollution degree 2 Standards and Approvals CSA CE UL listed Immunity EN50082 2 Emissions EN55011 Safety EN61010 Manufactured under ISO 9001 and ISO 14001 U S A Patent 5 708 363 1 Installation CDTX 90 Series transmitters are a...

Page 4: ...wire should be inserted into a terminal Splice double wires outside the terminal Sensor cable may not be extended over 100 ft Sensor Selection Select the sensor with a range closest to your process minimum and maximum values CDCE 90 001 0 01 cell 0 055 to 100 µS 10 kΩ to 18 MΩ Use the CDCE 90 001 for all resistivity requirements CDCE 90 01 0 1 cell 1 to 1000 µS CDCE 90 1 1 0 cell 10 to 10 000 µS C...

Page 5: ...AUX Power AUX Power PLC or Recorder Channel 1 4 20 mA in Channel 1 4 20 mA in Channel 2 4 20 mA in Channel 2 4 20 mA in Terminals Terminals Terminals Terminals AUX power required for all CDTX 90 systems CDTX 90 1 Terminal connections Output Output System Pwr Loop System Pwr Loop 4 3 2 1 6 5 Sensr Gnd SHIELD Iso Gnd BLACK Temp IN WHITE Signal IN RED 10 9 8 7 AUX Power AUX Power Terminals 5 6 Open c...

Page 6: ... Pwr Loop Sys Pwr Loop AUX Power AUX Power PLC or Recorder Channel 1 4 20 mA in Channel 1 4 20 mA in Channel 2 4 20 mA in Channel 2 4 20 mA in AUX required for all CDTX 90 systems System Pwr Loop System Pwr Loop AUX Power AUX Power 4 3 2 1 Sensr Gnd SHIELD Iso Gnd BLACK Temp IN WHITE Signal IN RED 14 13 12 11 Relay 2 NO Relay 2 COM Relay 2 NC Relay 1 NO Relay 1 COM Relay 1 NC 10 9 8 7 6 5 Terminal...

Page 7: ...er AUX Power 6 5 4 3 2 1 Loop2 Loop2 Sys Pwr Loop Sys Pwr Loop AUX Power AUX Power Transmitter 1 Transmitter 2 Example Two transmitters connected to PLC Recorder with separate power supply AUX power required for all CDTX 90 systems Sensr Gnd SHIELD Iso Gnd BLACK Temp IN WHITE Signal IN RED 14 13 12 11 Output 2 Output 2 Output 1 Output 1 10 9 8 7 Loop 2 Loop 2 System Pwr Loop System Pwr Loop AUX Po...

Page 8: ...ss than 5 µS The output will be 50 pulses min when value is 7 5 µS The output will be 100 when value is greater than 10 µS The starting point endpoint and maximum pulse rate are selectable in the CALIBRATE menu 3 3 Relay and Open Collector Outputs The Relay and Open Collector outputs can be used as a switch that responds when the process value moves above or below a setpoint or they can be used to...

Page 9: ...uence After entering the Key Code the display will show the first item in the selected menu Step 3 Scroll menu with UP or DOWN arrow keys Step 4 Press RIGHT ARROW key to select menu item to be edited The first display element will begin flashing Step 5 Press UP or DOWN keys to edit the flashing element RIGHT ARROW key advances the flashing element Step 6 Press ENTER key to save the new setting and...

Page 10: ...source for the Open Collector output Conductivity or Temperature Select the mode of operation for the Open Collector output Options available are High Low or proportional Pulse The signal may be disabled Off if not in use In Low or High Mode this Open Collector output will be activated when the process reaches this value Be sure to modify this setting if you change the Cond Units The Open Collecto...

Page 11: ...3 80 mA 4 00 mA 5 00 mA 19 00 mA 20 00 mA 21 00 ma Use this setting to match the system output to any external device Select ºC or ºF Set the percent change in Conductivity caused by a 1ºC change in temperature May be from 0 00 to 10 00 Active HIGH This setting is used to turn a device pump valve ON at the setpoint Active LOW This setting is used to turn a device OFF at the setpoint Press UP and D...

Page 12: ...accuracy Not required for CUSTOM sensors except for periodic calibration checks Select the input Conductivity or Temperature source to be associated with the current loop output Select the minimum and maximum values for the current loop output Be sure to modify this setting if you change the Cond Units Select the source Conductivity or Temperature for this relay output Select the mode of operation...

Page 13: ...m current output The display value represents the precise current output Adjustment limits 3 80 mA 4 00 mA 5 00 mA 19 00 mA 20 00 mA 21 00 ma Use this setting to match the system output to any external device Select ºC or ºF Set the percent change in Conductivity caused by a 1ºC change in temperature May be from 0 00 to 10 00 Press UP and DOWN keys to manually order any output current value from 3...

Page 14: ...en Collector output Conductivity or Temperature Select the mode of operation for the Open Collector output Options available are High Low or proportional Pulse The signal may be disabled Off if not in use In Low or High Mode this Open Collector output will be activated when the process reaches this value Be sure to modify this setting if you change the Cond Units The Open Collector output will be ...

Page 15: ...reme fluctuations Adjust the minimum and maximum current output The display value represents the precise current output Adjustment limits 3 80 mA 4 00 mA 5 00 mA 19 00 mA 20 00 mA 21 00 ma Use this setting to match the system output to any external device Select ºC or ºF Set the percent change in Conductivity caused by a 1ºC change in temperature May be from 0 00 to 10 00 Active HIGH This setting ...

Page 16: ...perature and set conductivity Optional Reset to factory calibration by entering zero as the Set Conductivity value Iso Gnd BLACK Temp IN WHITE Signal IN RED 9 8 7 Simulation resistor TC resistor 2 Temperature Coefficient Conductivity measurement is highly dependent on temperature Temperature dependence is expressed as the relative change per C commonly known as percent C change from 25 C or slope ...

Page 17: ...or replace sensor Check and correct wiring Replace sensor Troubleshooting 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 µS and the percent of total dissolved solids PPM PPM...

Page 18: ...page 18 Notes ...

Page 19: ...rwise shall not exceed the purchase price of the component upon which liability is based In no event shall OMEGA be liable for consequential incidental or special damages CONDITIONS Equipment sold by OMEGA is not intended to be used nor shall it be used 1 as a Basic Component under 10 CFR 21 NRC used in or with any nuclear installation or activity or 2 in medical applications or used on humans Sho...

Page 20: ...ers Air Velocity Indicators Turbine Paddlewheel Systems Totalizers Batch Controllers pH CONDUCTIVITY pH Electrodes Testers Accessories Benchtop Laboratory Meters Controllers Calibrators Simulators Pumps Industrial pH Conductivity Equipment DATA ACQUISITION Data Acquisition Engineering Software Communications Based Acquisition Systems Plug in Cards for Apple IBM Compatibles Datalogging Systems Reco...

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