Myron-l TH1 User Manual download pdf (Page 26)

Symptom

No display, even

though measurement

key pressed

Inaccurate pH readings

 (TPH1)

No response to

pH changes (TPH1)

Will not adjust down

to pH 7 (TPH1)

pH readings drift or

respond slowly to

changes in buffers/

samples (TPH1)

“FAC” is displayed

repeatedly (TPH1)

Unstable

Conductivity/TDS

readings

Unable to calibrate

Conductivity/TDS

Possible Cause

   

Battery weak or not connected

1. pH cali

bration needed (ref. pH Cal, pg. 12). 

2. Cross-contamination from residual pH

buffers or samples in sensor well.

3. Calibration with expired pH buffers.

Sensor bulb is cracked or there is an

electromechanical short caused by an

internal crack.

pH sensor has lost KCl.

1. Temporary condition due to “memory”

of solution in pH sensor well for long

periods

2. Bulb dirty or dried out

3. Ref

erence junction is clogged or coated.

Dirty electrodes

      

Film or deposits on electrodes   

XV. TROUBLESHOOTING CHART

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Myron-l TH1 User Manual Page 26

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