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) | |||
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TDS (PPM) = | Solution conductivity (∝S)/cm | ||
| PPM Factor | ||
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Example: | • Solution conductivity = 400 ∝S/cm | ||
| • TDS = 200 PPM (mg/L) | ||
PPM Factor = | 400 ∝S/cm = 2.00 | ||
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| 200 PPM | |
Troubleshooting
Display Condition | Possible Causes | Suggested Solutions |
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"- - - | 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 |
| kΩ or MΩ units selected & sensor is open. | SOURCE and RANGE values. |
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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 |
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Value must be greater than 0 | Custom cell constant cannot be set to 0 | Set cell constant to a value greater than 0 |
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"Value must be | Pulse Rate cannot be greater than 400 | set a pulse rate value less than 400 |
400 or less" |
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Display erratic, shows "0" or | Auxiliary Power not connected | Connect Auxiliary power |
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"Too much Error | Defective or dirty/coated sensor | Clean or replace sensor |
Check Sensor" | Wiring error | Check and correct wiring |
| Fluid conductivity too low |
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| Defective temp element | Replace sensor |
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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
•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
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