Myron-l PS6FCE User Manual download pdf (Page 38)

XVII. TROUBLESHOOTING CHART

Symptom Possible Cause Corrective Action

No display, even though

measurement key pressed

Battery weak or not connected. Check connections or replace battery. Ref. Battery Replacement, pg. 31.

Inaccurate pH readings 1. pH calibration needed. Ref. pH Cal.,

pg. 18.

2. Cross-contamination from residual pH

buffers or samples in sensor well.

3. Calibration with expired pH buffers.

1. Recalibrate instrument.

2. Thoroughly rinse sensor well.

3. Recalibrate using fresh buffers. Ref. pH Buffer Solutions, pg. 36.

No response to pH changes Sensor bulb is cracked or an

electromechanical short caused by an

internal crack.

Replace pH/ORP sensor. Ref. Replacement pH/ORP Sensor, pg. 37.

Will not adjust down to pH 7 pH/ORP sensor has lost KCl. Clean and rejuvenate sensor (ref. Cleaning Sensors, pg. 32) and recalibrate. If no

improvement, replace pH/ORP sensor (ref. Replacement pH/ORP Sensor, pg. 37).

pH readings drift or respond slowly to

changes in buffers/samples or “FAC”

is displayed repeatedly

1. Temporary condition due to “memory” of

solution in pH sensor well for long periods.

2. Bulb dirty or dried out.

3. Reference junction clogged or coated.

Clean and rejuvenate sensor (ref. Cleaning Sensors, pg. 32) and recalibrate. If no

improvement, replace pH/ORP sensor (ref. Replacement pH/ORP Sensor, pg. 37).

Unstable Conductivity/TDS/

MIN/SALT readings

Dirty electrodes. Clean cell cup and electrodes. Ref. Cleaning Sensors, pg. 32.

Unable to calibrate Conductivity/

TDS/MIN/SALT

Film or deposits on electrodes. Clean cell cup and electrodes. Ref. Cleaning Sensors, pg. 32.

Low ORP Reading

Slow or no response to ORP changes

ORP platinum electrode is dirty. Check the ORP sensor functioning. Take an ORP reading of Myron L pH/ORP

Sensor Storage Solution (ref. pH Sensor Storage Solution, pg. 36. If the reading is

outside the range of 350-400 mV, clean ONLY the platinum ORP

electrode with Myron L ORP Conditioner solution-soaked cotton swab (ref. ORP

Sensor Conditioner Solution, pg. 36), being careful not to touch the swab to the

glass bulb of the pH sensor.

responds very slowly or returns an

atypically high Predictive ORP value

1. Dirty platinum electrode (see above).

2. ORP sensor memory/battery effect.

Some ORP sensors exhibit a residual

charge when measuring LOW Free

Chlorine concentrations soon after

measuring a HIGH Free Chlorine

concentration.

1. Rinse the pH/ORP sensor well briey with a small amount of ORP Sensor

Conditioner Solution. DO NOT leave the conditioning solution in the sensor well

for more than 10 seconds.

2. Rinse the pH/ORP sensor 3 times with Sensor Storage Solution.

3. Fill the sensor well with Sensor Storage Solution and let rest for 5 minutes.

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Myron-l PS6FCE User Manual Page 38

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