Calibration or Slope No Endpoint
pH Sensor
Sensor needs deproteinizing/conditioning
Deproteinize/condition sensor, Page 3-7.
Bubbles in fill solution, or insufficient or concentrated fill solution
Debubble sensor, or empty and refill, Page 3-17.
The problem may also be caused by the reference sensor.
pCO
2
/pO
2
Sensor
Sensor needs deproteinizing
Deproteinize sensor, Page 3-7.
Sensor failure (confirm by measurement block routine, Page 4-10)
Replace sensor.
System
Dampness around the sensors
Dry off measurement block and sensors.
Check sensor ‘O’ ring seals and replace if necessary.
Check sensors are seated properly, and the tensioner is pushed
firmly home.
See Pages 3-17 and 3-19.
Partial blockage in sensors
Clear blockage, Page 3-31.
Gas pressure incorrect/gas flow rate incorrect/leaks in gas system/gas
cylinders connected incorrectly
Check gas pressure and flow rate/cure leaks/check gases connected
correctly, Page 3-10.
Bubble in sample path - specifically under the reference sensor
Repeat measurement and watch the solution being aspirated to
determine the cause of the bubble.
Very occasionally worn pump tubing may cause instability on one or
more channels
Replace tubing, Page 3-13.
Very occasionally, dampness around the pre-heater, or at the insulating
bushes at either end of the sample path may cause instability
Clean/dry areas carefully.
Troubleshooting the System Page 4-3
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