User Guide

Instruction Manual Calcium Electrode

TROUBLESHOOTING HINTS

Symptom Possible Causes Next Step

Out of Range defective meter check meter with shorting strap

Reading (see meter instruction manual)

defective electrode check electrode operation

electrodes not unplug electrodes and reset

plugged in properly

reference electrode be sure reference electrode is filled

not filled

air bubbles on remove bubbles by

membrane re-dipping electrode

electrodes not put electrodes in solution

in solution

Noisy or Unstable defective meter check meter with

Readings (readings shorting strap

continuously or

randomly changing air bubble on remove bubble by

membrane re-dipping electrode

meter or stirrer ground meter or stirrer

not grounded

outer filling solution fill electrode to level just

too low below fill hole

defective electrode replace electrode

electrode exposed to soak electrode in calcium standard

interferences

"Incorrect incorrect scaling plot millivolts on the linear

Answer" of semi-log paper axis. On the log axis, be sure

(but calibration concentration numbers within

curve is good) each decade are increasing

increasing concentration

incorrect sign be sure to note sign of

millivolt number correctly

incorrect standards prepare fresh standards

wrong units used apply correct conversion factor:

1.0x10

-3

M = 40 ppm Ca

100 ppm as CaCO

sample carryover rinse electrodes thoroughly