User Guide

Instruction Manual Ammonium Electrode

TROUBLESHOOTING HINTS

Symptom Possible Causes Next Step

Out of Range defective meter check meter with Reading

shorting strap

(see meter instruction manual)

electrode(s) unplug electrode(s)

not plugged in and reset

properly

reference electrode be sure reference

not filled electrode is filled

air bubbles on remove bubble by

membrane redipping electrode

electrodes not put electrode(s)

in solution in solution

"Incorrect incorrect scaling plot millivolts on the linear

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

curve is good) concentration numbers within

(but calibration each decade are increasing

with 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:

M = 18 ppm NH

14 ppm as N

sample carryover rinse electrodes

thoroughly between samples

Drift (reading samples and standards allow solutions

slowly changing at different to come to room

in one direction) temperatures temperature

before measurement

electrode exposed soak electrode

to interference in ammonium standard

incorrect reference use recommended

filling solution filling solution