 |
|
|
|
|
| PROBLEM |
|
POSSIBLE CAUSE |
|
SOLUTION |
|
| Calibration Fail (CF) |
|
Faulty Solenoid Valve(s) |
|
Run Solenoid Check cycle in Diagnostics – check status and connections of solenoid valves. |
|
|
|
| Calibration Fail (CF) |
|
Empty or Contaminated Standards Solutions Container |
|
Check to make sure CAL standard bladder is full, check CAL tubing to make sure it is not pinched. Replace CAL standard with fresh solution and try again. |
|
|
|
| Calibration Fail (CF) |
|
Standard solution not flowing |
|
Run solenoid check cycle, verify standard solution is flowing. If air trapped in line, gently squeeze bladder until flow resumes. |
|
|
|
| Calibration Fail (CF) |
|
Strength is too low. |
|
Replace reagent solution. Re-gel/replace hydrazine sensor. |
|
|
|
| Calibration Fail (CF) |
|
Strength is too high. |
|
New sensor – needs to rinse down. Let sensor run on sample for 5 hours – repeat calibration. |
|
|
|
| Calibration Fail (CF) |
|
Strength is close to zero. |
|
Replace reagent solution. Re-gel/replace hydrazine sensor. |
|
|
|
| Readings are not accurate – too low. |
|
Old/bad reagent. Poor sensor performance. Bad calibration. |
|
Replace reagent solution. Re-gel/replace hydrazine sensor. Check CAL log and run another CAL if last result is not good. |
|
|
|
| Readings are not accurate – too high. |
|
Poor electrode performance. Bad calibration. Hydrazine leak in sample system. |
|
Let sensor run on sample water for 1-2 hours; then run another CAL. Re-gel/replace hydrazine sensor. Check CAL log and run another CAL if results are not good. Bench test sample water. |
|
|
|
| Current outputs (4-20mA) not functioning correctly. |
|
Disconnected wiring at transmitter or along wire path. DCS/recording system not set up properly. Bad CPU board. |
|
Check output set-up to make sure values are entered properly. Run Diagnostics – O/PmA check and check output coming directly from transmitter. Replace CPU board if output is not correct. |
|
|
|
| Alarms not functioning correctly. |
|
Disconnected wiring at transmitter or along wire path. DCS/recording system not set up properly. Bad DIO board. |
|
Check alarm set-up to make sure values are entered properly. Run Diagnostics – Relay Check cycle and check alarm output directly from transmitter. Replace DIO board if output is not correct. |
|
|
|
| Display read “HOT” |
|
Sample temperature over specified range (>131F). Faulty thermistor. |
|
Check sample temperature. Clean/replace sensor. |
|
|
|
| Display read “TEMP” |
|
No thermistor response. |
|
Replace sensor. Check cable connections at transmitter and sensor |
|
|
|
| Display read “OVR” |
|
Signal from sensor too high – sample concentration over maximum range (>1ppm) |
|
Check sample concentration. Check sensor connections. |
|
|
|
