eutech-instruments lead epoxy Manuel D’Utilisation

Instruction Manual

Lead 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

not filled

is filled

air bubble on membrane

remove bubble by re-dipping electrode

electrodes not

put electrodes in solution

in solution

Noisy or

defective meter

check meter with shorting strap

Unstable Readings
(readings

air bubble on membrane

remove bubble by re-dipping electrode

continuously
or rapidly changing) electrode exposed

soak electrode in lead standard

to interferences

defective electrode

replace electrode

ISA not used

use recommended ISA

meter or stirrer

ground meter or stirrer

not grounded

Drift (reading

samples and standards

allow solutions to come to room

slowly

at different temperatures

temperature before measurement

changing in one
direction)

complexing agents

check section entitled

in sample

Precipitation and Complexation

incorrect reference

use recommended

filling solution

membrane dirty

polish membrane; use

or oxidized

methanol-formal dehyde solution