GF Signet 2630 User Manual

Signet 3-2630-X Amperometric Free Chlorine Electrode
Signet 3-2632-X Amperometric Chlorine Dioxide Electrode

*3-2630.090*

3-2630.090

1. Description

The Signet Amperometric Chlorine Electrodes are designed to measure chlorine in fresh, clean water treatment applications.
Free Chlorine electrodes are available in measurement ranges of 0 to 2 ppm, 0 to 5 ppm or 0 to 20 ppm.
Chlorine Dioxide electrodes are available in measurement ranges of 0 to 2 ppm.
Electrodes require the Signet 2650 Amperometric Electronics to output a digital (S3L) signal to the Signet 8630 Chlorine Transmitter

Features:

• Utilizing smart-sensor technology, this electrode incorporates a unique embedded memory chip within the electrode to

• Signet's patented DryLoc® connector provides quick assembly and a secure connection. Gold-plated contacts and an O-ring

• Integrated temperature element for automatic temperature compensation.

• Separate drive electronics (Signet 2650) allow easy electrode replacement without running new cable.

Rev. M 09/13

CAUTION!

1. Follow instructions carefully to avoid personal injury or damage to electrode.

2. Prior to installation or removal:
a. Disconnect fl ow through system.
b. Drain below sensor level.

3. Confi rm chemical compatibility before use.

4. Do not exceed the maximum pressure or temperature specifi cations.

5. Do not alter product construction.

1. Description p.1 5. Maintenance p.2 9. Overview p.5

2. Sensor Preparation p.1 6. Storage and Disposal p.3 10. Troubleshooting p.6

3. Operation p.2 7. Installation p.4 11. Ordering p.7

4. Calibration p.2 8. Mounting Position p.4 12. Technical Data p.8

communicate a wide variety of information to the Signet 2650 electronics and Signet 8630 transmitter. Electrode type,
factory calibration data, service time, chlorine range, high and low pH (with optional Signet pH electrode), temperature limits
and more are stored on the chip. This information is accessible via the Signet 8630 transmitter.

seal ensure a waterproof and reliable interconnect to the Signet 2650 Amperometric Electronics.

English

2. Sensor Preparation

• Chlorine sensors are shipped without internal electrolyte solution.

• Prior to installation and supplying power, Chlorine sensors must be fi lled with the appropriate internal electrolyte solution.

• Verify the correct electrolyte solution is utilized with the corresponding sensor.

• Free Chlorine and Chlorine Dioxide sensor require different electrolyte solutions.

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.

CAUTION:

Initial Fill Procedure:

When adding electrolyte, be prepared for an accidental spill.
Working near a sink is recommended.

1. Remove the protective bottle from the end of the electrode

2. Remove the membrane cap from the front of the sensor.
Note: When new sensors are shipped, the membrane cap is not tightened to the sensor

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.

DO NOT touch the gold tip or the membrane of the sensor.

3. Operation

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.

Part Number Chlorine Range Chlorine Type

3-2630-1 0 to 2 ppm (mg/L)

Free chlorine3-2630-2 0 to 5 ppm (mg/L)

3-2630-3 0 to 20 ppm (mg/L)

3-2632-1 0 to 2 ppm (mg/L) Chlorine Dioxide

The electrode should not be used in water
containing surfactants, oils, organic chlorine
or stabilizers such as cyanuric acid.

The maximum allowable operating pressure
must be less than 0.48 bar (7 psi).
Higher pressures will damage the electrode.

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.

5. Maintenance

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)

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.

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.

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.

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.

2 263X Series Chlorine Electrodes

6. Storage and Disposal

Store electrode between –10 ºC to 60 ºC (–14 ºF to 140 ºF) at a relative humidity that does not exceed 95%.

DO NOT
FREEZE

6.1. Storage of the Sensor

If the sensor or panel assembly is to be removed from service for a period of time the sensor must be properly prepared for storage
and may need to be recommissioned.

Storage periods of 1 week or less:

• Close the drain valve, then close the inlet valve of the fl ow cell, to maintain water inside the fl ow cell to keep the membrane wet.

• If draining the fl ow cell is required, remove the sensor from the cell and the 2650 electronics and store in the shipping bottle with

tap water added.

Storage periods greater than 1 week, but less than 2 months:

• Remove the membrane cap and internal electrolyte solution.

• Rinse the sensor internal chamber with DI water or cold tap water; drain and allow to dry.

• Place the membrane cap back onto the sensor. INSTALL LOOSE, DO NOT COMPLETELY TIGHTEN THE CAP.

WHEN STORED DRY, THE MEMBRANE CAP MUST BE STORED RELAXED AND UNSTRESSED.

• Store sensor DRY in the shipping bottle, DO NOT ADD WATER.

The primary concerns when storing the electrode is membrane dehydration and freezing in extremely cold environments.

Recommissioning Procedure:

1. Fill the sensor with the electrolyte as outlined in Maintenance, Section 3, and install the membrane cap.

2. The sensor will have to be polarized in the fl ow cell with fl owing Chlorinated water before being used.

Note: This may take 30 to 120 minutes before calibration can be performed.

3. If the sensor does not recover after recommission, follow steps 1-10 outlined under
"Storage periods greater than 2 months."

4. If the sensor still fails to work properly, continue with steps 11-17.

Storage periods greater than 2 months:

• If the sensor has been in storage for a long period of time, or used in a chlorine free environment, the sensor may develop
a low slope (output), which may cause the sensor to have a slow response time.

• In this case, the sensor must be reconditioned.

Required to recondition a sensor:

• DI Water

• Beaker (any size available)

• Polishing Sheets (Included in sensor maintenance kit)

• Free Chlorine: Chlorine Bleach (13% concentration)

• Chlorine Dioxide: Aqueous Chlorine Dioxide solution

CAUTION!

Bleach

and Chlorine Dioxide solutions are

very corrosive and

may release dangerous gases if it comes in contact with acids.

• Wear proper protective clothing (gloves and eye protection)

• Avoid contact with skin and eyes

• Observe all warnings on safety data sheets

• Avoid spilling bleach and possible contact with acids

Reconditioning Procedure:

1. Remove the sensor from the 2750-7 electronics.

2. Remove the membrane cap.

3. Place the sensor on a fi rm fl at surface with the gold
cathode pointing upward.

4. Apply a small amount of water to the Blue (Course)
polishing paper (dull side).

5. Polish the gold electrode by moving the paper in a
circular pattern for 30 seconds. DO NOT go back and
forth in a single direction. See Figure 1.

6. Rinse the sensor tip with DI water.

7. Apply a small amount of DI water to the White
(Fine) polishing paper (dull side) and polish the gold
electrode by moving the paper in a circular pattern for
30 seconds. DO NOT go back and forth in a single
direction. See fi gure 1.

8. Rinse the sensor tip with DI water.

9. Top off the sensor with electrolyte and inspect

Figure 1

Curved Surface

membrane for dirt or damage. Replace if necessary.

10. Insert the sensor into the 2650 electronics and apply
power.

(Steps 11-17, See Next Page)

3263X Series Chlorine Electrodes