Myron L D-6 User Manual

Page 40

XX. TrOuBLESHOOTING CHArT

SYMPTOM

POSSIBLE CAuSE

Meter won’t turn ON

• Battery weak.

Inaccurate pH readings

(D-6)

• pH calibration needed.
• Contamination from residual pH buffers

or samples in sensor well.

• Calibration with expired pH buffers.

No response to pH

changes (D-6)

• pH/ORP sensor bulb is cracked.

• Electromechanical short inside the

sensor body.

pH Zero Point calibration

will not adjust down to pH

7.0 (D-6)

• pH/ORP sensor’s internal KCl solution

is depleted or contaminated.

pH readings drift or

respond slowly to changes

in buffers/samples (D-6)

“FAC” is displayed

repeatedly

• Temporary condition due to the pH/

ORP sensor’s memory of solution in left

in the sensor well for long periods.

• Bulb dirty or dried out.

• Reference junction clogged or coated.

Unstable Conductivity or

TDS reading

• Dirty electrodes.

Unstable Resistivity

readings

• Dirty electrodes.

• Contamination of sample due to

exposure to air resulting in samples

with resistivity >1MΩ.

Unable to calibrate

Conductivity or TDS

• Film or deposits on electrodes.

Resistivity readings much

lower than expected

• Contamination from previous sample or

from pH sensor well.
• Test Sample is contaminated by

Carbon dioxide absorbed from the air

(commonly caused by using a standing

sample).