Hach-Lange PHC10115 User Manual - Manual (Page 11)

Message or symptom Possible cause Action
Connect a probe or probe
requires service Probe not connected properly Disconnect, then connect the probe. Tighten the locking
nut.
Software not updated To download the most current version of the software,
refer to the applicable product page on the manufacturer's
website.
Refer to the HQd Series meter manual.
Large number of methods stored Continue to let probe connect. Do not disconnect the
probe.
Damaged probe Make sure there is connectivity with another probe or
meter to confirm isolated issue with probe. Contact a
Technical Support Representative.
Standard not recognized
error Tape not removed from the
reference junctions Remove the tape.
Standard not recognized
error Probe storage cap or soaker
bottle not removed. Remove the probe storage cap or soaker bottle.
Incorrect or contaminated buffer
solution Use fresh buffer solution as specified in the method.
pH reading and/or mV
reading is same for all
solutions Tape not removed from the
reference junctions Remove the tape.
pH reading and/or mV
reading is same for all
solutions Storage cap or soaker bottle not
removed Remove the storage cap or soaker bottle.
Electrical issue Contact a Technical Support Representative.
Slow stabilization time Tape not removed from the
reference junctions Remove the tape.
Slow stabilization time Contaminated glass sensor Clean the probe (refer to Clean the probe on page 9).
Poor contact between reference
junction and solution Shake the probe in the solution from side to side to refresh
the reference junction.
Probe not prepared for sample For the best stabilization time, soak the probe in the
sample for 10 to 15 minutes before doing a sample
measurement.
Low sample temperature or
temperature difference between
samples Check the sample temperature. The lower the
temperature or the greater the difference of temperatures
between samples, the longer the stabilization time will be.
Air bubbles around inner
reference electrode Gently tap the probe with hand or shake the probe
downward to remove any air bubbles.
Calibration errors Calibration not done correctly Recalibrate using freshly prepared pH buffers.
Contaminated glass sensor Clean the probe (refer to Clean the probe on page 9).
Slope exceeds the criteria for %
of theoretical (as defined in the
method slope limit)
1. Widen the slope limits by changing the
PHC101 calibration settings and method.
2. Recalibrate the probe.
3. Run a check standard to check the performance of
the probe.
11