Hanna Instruments Edge Instruction Manual page 83

Symptoms
If the display shows:
"mV" and "-1000" or
"1000" blinking.
The meter does not
measure temperature.
"----" is displayed on 2nd
LCD line.
The meter fails to
calibrate NaCl.
The meter fails to
calibrate or gives faulty
readings.
At startup the meter
displays all LCD tags
permanently.
CAL "Prod" message at
startup.
Problems
Out of range in the mV
scale.
Broken temperature
sensor.
Incorrect EC calibration.
Broken pH electrode.
One of the keys is stuck.
Instrument was not
factory calibrated or lost
factory calibration.
Solution
A) Verify the shipping cap has been
removed.
B) Make sure the sample pH is within
specified range.
C) Verify electrolyte level in pH sensor
is topped off.
D) Verify no bubbles inside pH
membrane.
Replace the probe.
Recalibrate the meter in EC range. Set
cell constant to 1.
Replace the electrode.
Check the keyboard or contact your
local Hanna Office
Contact Hanna Technical Support for
help.
Troubleshooting
Guide
Maintenance
83