Extech Instruments ExStik EC500 User Manual page 13

Troubleshooting
Problem
Reading is frozen
"BAT" message
Unit will not calibrate in pH
Unit will not calibrate in pH
Unit will not calibrate in pH
Unit will not calibrate in pH
Unit will not calibrate in
conductivity mode
Unit will not calibrate in
conductivity mode
Unit will not calibrate in
conductivity mode
Unit will not calibrate in
conductivity mode
Unit will not turn on
Unit will not turn on
"RENEW" message
"RENEW" message
Unit will not respond to any
key presses
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Possible Cause
Unit is in "HOLD" mode
Batteries are low
Low pH slope
Clogged or contaminated
reference junction
Damaged or worn out
sensing membrane
Contaminated pH buffers
Contaminated conductivity
standards
Dirty probe
Damaged conductivity probe
Trapped air bubbles
Batteries are low or dead
Batteries installed with
incorrect polarity
pH sensor needs
recalibration
pH sensor slope has fallen
below acceptable limits
Internal fault
13
Action
Press MODE/HOLD key to
exit "HOLD" mode
Replace batteries
Replace electrode, see
reorder information
Clean junction (see
cleaning instructions)
Replace electrode, see
reorder information
Use fresh buffers
Use fresh standards
Clean conductivity probe
(See cleaning instructions)
Replace electrode, see
reorder information
Tap or stir to release air
bubbles
Replace batteries
Replace batteries,
observe polarity
Recalibrate unit
Use fresh buffers
Replace electrode, see
reorder information
Perform hard reboot:
Remove batteries, hold
ON/OFF switch down for 5
seconds, replace batteries
EC500-EU-EN-V2.4-2/11