ECD DO82 Instructional Manual

HYDRA-DS NO
3
-N Page 35
6.0 TROUBLESHOOTING
Problem
Possible Cause
Remedy
NO
3
-N Reading Low
Dirty Coated electrode
Clean sensor:
Soak in 2% HCU for 5 minutes to remove algae or
rinse with weak detergent 10-15 seconds solution
to remove oils.
Soak in tap water for 30 minutes after either
cleaning method. Increase frequency of the air
blast cleaner
Old Expired NO3 ISE
Perform two point calibration, the slope > 40
mV/decade if not replace NO3 Sensor
Inaccurate Potassium compensation
Verify Chloride ISE reading with single point
calibration.
Adjust Cl coef (see section 4.0.5)
NO
3
-N Reading High
Ammonium Sensor has drifted
Perform a single point calibration
Low or No Chloride ion
Compensation
Verify Cl comp is ON
Verify Chloride ISE reading with single point
calibration
Adjust Cl coef (see section 4.0.5)
Interfering Ions Present in Sample
Influx of interfering ions causing error, wait for ions
to clear the process, Iodide, Bromide, HS-,
Chlorate, Chlorite, Carbonate, Bicarbonate, Nitrite
No Response to
Changing Nitrate
Bad Electrode
Visual inspect membrane for cuts, if torn replace
electrode
Remove the electrode examine for breakage, torn
o-rings, corrosion or moisture, if any of these
issues are present:
Switch out old electrode with a new electrode,
check response, if good recalibrate the HYDRA-DS
Bad Sensor
Switch out old electrode with a new electrode,
check response, if still bad examine electrode tube
for signs of moisture.
If present remove sensor from installation and
allow the sensor to dry out. Retest with a new
electrode, if it still fails return it to the factory for
refurbishment.

ECD DO82 Specifications

General

Brand	ECD
Model	DO82
Category	Transmitter
Language	English