AMMONIA User Manual
AMMONIA_User 9/09
2
8
2.2 Sensor Calibration
If the Analyzer cannot calibrate you’ll view this warning after
you modify the sensor value & key
ENTER
.
Key
ENTER
to ignore the warning or
EXIT
to return the
sensor to its pre-calibration value.
To reset the sensor to its factory default setting
key
ENTER
and
DOWN
to
Factory Reset
.
Press
ENTER
.
Factory Reset
doesn’t correct the
problem which caused the warning
In this example, we started at
1.30 ppm
, got a warning
when we performed a single point calibration at
1.60 pp
and
returned to
0.05 ppm
after
Factory Reset
. Looks like this
sensor could be fouled.
Sensor Fault
Ignore warning
NH3
1.30 ppm
Calibrate
Alarms
Factory Reset
Yes
NH3
0.5 ppm
D
and
Calibrate Faults
Sidebar:
Sensor Fault:
The Analyzer verifies that sensor OFFSET or GAIN required to make the sensor
read its new value are within the range of typical sensor operation.
If out of range,
Sensor Fault
displays.
Fault Cause
varies with sensor type
.
Ammonia:
Fouling lowers the measured value. Remove and inspect. Whitish deposits indicate
overcycling & may require HCl cleaning to remove. If no visible fouling, clean with alcohol or
solvent then
Factory Reset
.
pH:
Verify solution ground connected & excess sensor cable coiled at sensor, not in enclosure.
Verify sensor cable not shortened & firmly connected. Then replace if no recovery after
Factory
Reset
. pH sensor life decreases with handling and temperature extremes.
Temperature:
Verify color coding correct and sensor wires firmly connected. Inspect sensor for
damage or leaking.