User Manual

Troubleshooting Guide
Symptom: Drift – readings slowly varying
Possible Causes:
1. Glassware not clean
- clean glassware
2. Wick contaminated or blocked
- replace probe
3. Glassware aged
- replace probe
Symptom: Noisy – readings jumping
Possible Causes:
1. Bubble in glassware
- flick probe downward and allow bubble
to rise away from the end of the probe
2. Poor connection to meter
- check BNC fitting
3. Contact zone not immersed
- lower probe into solution below level of
wick
Symptom: Displays similar pH reading in all buffers no
matter what the buffer value is.
Possible Causes:
1. Glassware or stem cracked
- replace probe
Symptom: Displays pH 7 for all buffers
Possible Causes:
1. Electrical short
- check BNC fitting and cable for
damage
2. BNC fitting wet
- dry BNC fitting with cloth
3. Broken glassware
- replace probe
Symptom: Unsuccessful calibration (Low Slope <90%)
Possible Causes:
1. Buffers inaccurate
- replace buffers
2. Glassware not clean
- clean glassware
3. Glassware aged – (glassware will not clean)
- replace probe
4. BNC fitting wet
- use cloth to dry (Note: terms of guarantee)
Symptom: Incorrect sample reading following
successful calibration
Possible Causes:
1. Ground loop (Often occurs in process
systems)
- Verify by removing the sample from its
environment and measuring in a glass
beaker. May require electrical circuitry
checked in system
2. Wick blocked
- replace probe
Extra Information - Visit www.getbluelab.com to see or learn more about Bluelab products
 All electrodes have a serial number on the probe stem which identifies the date of manufacture.
 Normally a probe will have a life of 2 years in ideal samples at room temperature. This will be reduced in
chemically aggressive or abrasive samples and elevated temperatures.
 Remember not to discard the wetting cap as this should be replaced over the probe tip when the probe is not
being used. If you misplace it, sit the probe upright in fresh water.