Myron L ARH1 - Manual (Page 11)

X. TROUBLESHOOTING CHART
17
Symptom Possible Cause Corrective Action
No display, even though Battery weak or not connected. Check connections or replace battery
measurement key pressed. (ref. Battery Replacement, pg. 14).
Inaccurate pH readings 1. pH calibration needed (ref. pH Cal., pg. 11). 1. Recalibrate instrument.
2. Cross-contamination from residual 2. Thoroughly rinse sensor well.
pH buffers or samples in sensor well. 3. Recalibrate using fresh buffers (ref.
3. Calibration with expired pH buffers. pH Buffer Solution, pg. 18).
No response to pH changes Sensor bulb is cracked or an electro- Replace pH sensor (ref. pH Sensor, pg. 15).
mechanical short caused by an internal crack.
Will not adjust down to pH 7. pH sensor has lost KCl. Clean and rejuvenate sensor (ref. pH, pg. 15)
and recalibrate. If no improvement, replace
pH sensor (ref. pH Sensor Replacement, pg.
15).
pH readings drift or respond 1. Temporary condition due to “memory” of Clean and rejuvenate sensor (ref. pH, pg. 15)
slowly to changes in solution in pH sensor well for long periods. and recalibrate. If no improvement, replace
buffers/samples. 2. Bulb dirty or dried out. pH sensor (ref. pH Sensor Replacement, pg.
3. Reference junction clogged or coated. 15).
Unstable Conductivity or Film or deposits on electrodes. Clean cell cup and electrodes
T D S readings. (ref. Conductivity or TDS, pg. 15).
Unable to calibrate Film or deposits on electrodes. Clean cell cup and electrodes (ref.
Conductivity or T D S . Conductivity or TDS, pg. 15).