2
263X Series Chlorine Electrodes
Verifying the sensors accuracy using the DPD method should be performed to determine if the sensor requires maintenance.
1.
Inspect the membrane for dirt or damage. Replace the membrane if its torn or if the gold cathode is visible.
2.
If the membrane is dirty clean the membrane by soaking it in 1 - 5% HCL and gently washed with a stream of DI water.
(do not use any mechanical device on the membrane)
5. Maintenance
Refi ll Procedure:
When adding electrolyte, be prepared for an accidental spill.
Working near a sink is recommended.
1.
Remove the membrane cap from the front of the sensor.
2
. Turn the sensor upside down and shake the sensor vigorously to remove the
internal electrolyte.
3
. Fill supplied syringe with electrolyte solution.
4.
Place the electrode on a level surface.
5.
Insert syringe needle fully into one of the eight electrode holes while injecting with
electrolyte solution. Slowly injecting the electrolyte solution into the sensor to avoid
introducing air bubbles. The electrode holds approximately 14 milliliters of solution.
Slowly
fi
ll until solution begins to
fl
ow out of holes. Do not allow the solution to run
down the electrode and wet the electrical contacts in the DryLoc connector.
6
. Slowly screw on the membrane cap
fi
nger tight. Do not use tools.
To avoid damage and contamination, do not touch the white membrane surface
on the membrane cap.
Avoid skin or eye contact with electrolyte solution.
Wear rubber gloves and goggles.
* Material Safety Data Sheets (MSDS) are available online at
www.gfsignet.com.
Additional caution should be taken when handling the
Chlorine Dioxide electrolyte solution.
If a fresh water rinse does not clean the membrane, it will need to be replaced.
Keep spare membrane caps available. Membrane caps carry no warranty.
Diluted HCl can irritate the eyes and skin, use proper safety equipment.
Do not use surface tension reducing chemicals, detergents or solvents on the membrane.
Electrode Range:
The electrode must match the type and range of
chlorine concentration to be measured.
Flow Rate:
The electrode must have a stable and constant
fl
ow of water past its
membrane for accurate measurement. When the sensor is installed
in the Tee
fl
ow cell 3-3610-2 (159 001 684), the
fl
ow rate must range
from 37.8 to 75.7 LPH (10 to 20 US g/h).
When the sensor is installed in the Flow Cell Block
3-4630.392 (159 001 690), the
fl
ow rate range should be
30.24 to 45.36 LPH (8 to 12 US gph).
Sensor Conditioning: 4 hours
A new electrode requires conditioning of 4 hours with the electrode
powered on and water
fl
owing past the head to generate a
stable reading.
Subsequent start-ups can require an electrode conditioning of up to two hours.
3. Operation
The maximum allowable operating pressure
must be less than 0.48 bar (7 psi).
Higher pressures will damage the electrode.
The electrode should not be used in water
containing surfactants, oils, organic chlorine
or stabilizers such as cyanuric acid.
Part Number
Chlorine Range
Chlorine Type
3-2630-1
0.02 to 2 ppm (mg/L)
Free chlorine
3-2630-2
0.05 to 5 ppm (mg/L)
3-2630-3
0.1 to 20 ppm (mg/L)
3-2632-1
0.02 to 2 ppm (mg/L) Chlorine Dioxide
4. Calibration
A new chlorine electrode or one that has had the membrane cap changed must be calibrated. Refer to the Signet 8630 Chlorine
Transmitter manual for electrode and instrument calibration information. A diethyl-p-phenylenediamine (DPD) colorimeter test kit
(not included) is required for sensor calibration. A sample is taken and analyzed with the DPD test kit, then this value is entered into
the Signet 8630 transmitter.
• Calibrate after a membrane cap change.
• Check calibration one day after sensor is placed in service.
• Check calibration weekly to monthly depending on process requirements.
