eutech-instruments ammonia gas Manuel D’Utilisation

Instruction Manual

Ammonia Gas-sensing Electrode

TROUBLESHOOTING HINTS

Symptom Possible Causes

Next Step

Out of Range

defective meter

perform meter checkout procedure

Reading

(see meter instruction manual)

defective inner body

refer to

Checking the Electrode

Inner Body

electrode not

unplug electrode and reset

plugged in properly

internal filling

fill outer body of electrode with proper

solution not added

amount of internal filling solution

air bubble on membrane

remove bubble by re-dipping

electrode

electrode not in solution

put electrode in solution

Noisy or Unstable insufficient

fill outer body of electrode with proper

Reading (readings internal filling solution

amount of internal filling solution

continuously or
randomly changing.) defective meter

perform meter checkout procedure

(see meter instruction manual)

bottom cap loose

ensure that bottom cap is screwed on

tight enough to close gap between

bottom cap and body

defective inner body

refer to

Checking the Electrode

Inner Body

air bubbles on membrane

remove bubbles by redipping electrode

meter or stirrer

check meter and stirrer for

improperly grounded

grounding

Drift (reading slowly internal filling

ensure that membrane is installed

changing in one solution leakage

properly

incorrect internal

refill outer body of electrode using

filling solution

filling solution shipped with electrode

total sample level

dilute sample of dissolved species

above 1M

electrode in sample

reduce surface area to volume ratio,

too long; NH

loss

slow down rate of stirring, avoid