Page 1
Signet 2724-2726 and 2734-2736 Series DryLoc pH and ORP Electrodes
*3-2724.090*
3-2724.090 Rev. H 11/13
Operating Instructions
Description
English
2724 & 2725
2734 & 2735
Flat Glass
Electrode
2726 & 2736
Protected
Bulb Glass
Electrode
The Signet 2724-2726 and 2734-2736 Series of pH and ORP electrodes are designed
to minimize maintenance time and maximize value.
• The unique DryLoc® connector provides quick assembly and a secure
connection featuring gold-plated contacts and an O-ring seal.
• The patented design features a lengthened reference chamber pathway to
extend the operational life of the electrode.
• Wetted materials are selected to withstand a wide array of industrial applications.
• Multiple mounting features address the need for installation fl exibility.
These electrodes can be threaded into ¾ in. NPT or ISO 7/1 R¾ inch pipe fi ttings,
submerged in a tank, or mounted into familiar Signet installation fi ttings.
• To build a stand-alone, self-contained pH control system, combine the
2724-2726 electrodes with a 2760 pH Preamplifi er and add a 8750 pH/ORP
Transmitter to move your control capability to the next level.
• Combine the 2427-2726 or 2734-2736 electrodes with the
2750 pH Sensor Electronics to provide a 4 to 20 mA loop to a
Programmable Logic Controller (PLC), SCADA system, or datalogger.
• For more fl exibility and unique features, pair the 2724-2726 or 2734-2736 series
with a 2750 pH/ORP Sensor Electronics and the new 9900 Transmitter.
• Connect up to six 2724-2726 or 2734-2736 electrodes to one 8900 Multi-Parameter
Controller with six 2750 pH/ORP Sensor Electronics using digital (S3L) serial data
output for a truly amazing set of features, options, and measurements.
• The 2724-2726 electrodes are recommended for general purpose applications.
• The 2734-2736 electrodes are recommended for harsh applications.
• The 2734-2736 electrodes utilize advanced reference technology to extend
electrode life in all applications.
Table of Contents
Description ............................................................................................ 1
Warranty Statement .............................................................................. 2
Product Registration ............................................................................. 2
Chemical Compatibility ......................................................................... 2
Safety Information................................................................................. 2
Dimensions ........................................................................................... 3
Specifi cations........................................................................................ 3
In-Line Installation................................................................................. 4
Low Conductivity Installation ................................................................ 4
Signet Installation Fittings ..................................................................... 5
Removing from In-Line Installation ....................................................... 5
Submersible Installation........................................................................ 5
pH System Calibration .......................................................................... 6
ORP System Calibration ....................................................................... 6
Electrode Date Code ............................................................................ 7
Electrode Care and Application ............................................................ 7
Cleaning................................................................................................ 7
Ordering Information ............................................................................. 8
Page 2
General Information
Warranty Information Safety Information
Refer to your local Georg Fischer Sales offi ce for the most
current warranty statement.
All warranty and non-warranty repairs being returned must
include a fully completed Service Form and goods must be
returned to your local GF Sales offi ce or distributor.
Product returned without a Service Form may not be
warranty replaced or repaired.
Signet products with limited shelf-life (e.g. pH, ORP, chlorine
electrodes, calibration solutions; e.g. pH buffers, turbidity
standards or other solutions) are warranted out of box but not
warranted against any damage, due to process or application
failures (e.g. high temperature,
mishandling (e.g. broken glass,
chemical poisoning, dry-out) or
damaged membrane, freezing
and/or extreme temperatures).
Product Registration
Thank you for purchasing the Signet line of Georg Fischer
measurement products.
If you would like to register your product(s), you can now
register online in one of the following ways:
• Visit our website www.gfsignet.com and
click on Product Registration Form
• If this is a pdf manual (digital copy),
click here
• Scan the QR Code on the left
Chemical Compatibility
1. Use appropriate eye, face, hand, body and/or respiratory
protection when using chemicals or solvents.
2. Prior to installation or removal:
• Depressurize and vent system
• Drain below sensor level.
3. Confi rm chemical compatibility before use.
4. Do not exceed the max. temperature/pressure specifi cations.
5. Do not alter product construction.
If installing into a threaded connection:
6. Inspect threads to ensure integrity.
Do not install a sensor that has damaged threads.
7. Apply PTFE tape to the process connection threads in
accordance with industry practices.
8. HAND TIGHTEN the sensor into the process connection.
DO NOT USE TOOLS.
Caution / Warning / Danger
Indicates a potential hazard. Failure to follow all warnings
may lead to equipment damage, injury, or death
Personal Protective Equipment (PPE)
Always utilize the most appropriate PPE during
installation and service of Signet products.v
Pressurized System Warning
Sensor may be under pressure, take caution to vent
system prior to installation or removal. Failure to do so
may result in equipment damage and/or serious injury.
The retaining nuts of pH and ORP sensors are not designed
for prolonged contact with aggressive substances.
Strong acids, caustic substances and solvents or their
vapor may lead to failure of the retaining nut, ejection of the
sensor and loss of the process fl uid with possibly serious
consequences, such as damage to equipment and serious
personal injury. Retaining nuts that may have been in
contact with such substances, e.g. due to leakage or spilling,
must be replaced.
• The use of this product assumes
operators are trained and familiar
with this type of device.
• Operators should be knowledgeable
of the potential risks associated with
pressurized piping systems.
• Operators MUST follow all
necessary safety procedures.
DO NOT
FREEZE
Hand Tighten Only
Overtightening may permanently damage product
threads and lead to failure of the retaining nut.
Do Not Use Tools
Use of tool(s) may damage product beyond repair and
potentially void product warranty.
Note / Technical Notes
Highlights additional information or detailed procedure.
Do Not Freeze
Products are temperature sensitive and may contain
freezable liquids. Freezing damage to pH, ORP, and
Chlorine electrodes voids product warranty.
2
Signet 2724-2726 and 2734-2736 Series pH and ORP Electrodes
Page 3
Table of Contents & Dimensions
Dimensions
2724, 2725, 2734, & 2735 Flat Glass Electrode
95.76 mm
(3.77 in.)
2726 & 2736 Protected Bulb Glass Electrode
95.76 mm
(3.77 in.)
8.89 mm
(0.35 in.)
Maximum Temperature and Pressure Rating
10.3
150
8.6
125
6.9
100
5.2
75
3.4
50
1.7
25
(bar)(psi)
°C
°F
19.05 mm
(0.75 in.)
25.4 mm
(1.0 in.)
19.05 mm
(0.75 in.)
25.4 mm
(1.0 in.)
0
-20
-40
-40 -4 32
272X
0
18.3 mm
(0.72 in.)
18.3 mm
(0.72 in.)
273X
20
68
6.35 mm
(0.25 in.)
6.35 mm
(0.25 in.)
40
60
104
140 176 212
Threads:
¾ in. NPT or
ISO 7/1 R¾
44.45 mm
(1.75 in.)
Threads:
¾ in. NPT or
ISO 7/1 R¾
53.34 mm
(2.1 in.)
273X
272X
80
100
120
248
Specifi cations
General
Compatibility ..................... 2750 pH/ORP Sensor electronics,
pH Temp Sensor:
PT1000 .............................Compatible with 2750 electronics
Connection to ............... PLC, 9900 Transmitter,
3 KΩ Balco .......................Compatible with 2760 preamplifi er
Connection to ............... 8750 pH/ORP Transmitter
Process Connection ......... ¾ in. NPT or ISO 7/1 R¾ threads
Wetted Materials:
pH (2724 & 2726) ............. Ryton (PPS), glass, UHMW PE, FPM
ORP (2725) ...................... Ryton (PPS), glass, UHMW PE, FPM,
pH (2734 & 2736) ............. Ryton (PPS), glass, PTFE, FPM
ORP (2735) ...................... Ryton (PPS), glass, PTFE, FPM, Platinum
Shipping Weight ..........0.25 kg (0.55 lb)
Performance
Effi ciency (2724-2726) .... > 97% @ 25 °C (77 °F)
Effi ciency (2734-2736) .... > 95% @ 25 °C (77 °F)
• Effi ciency indicates the "wellness" of a new electrode.
• Effi ciency is measured by comparing the actual slope (mV/pH)
at 25 °C to the theoretical output of 59.16 mV/pH.
• An effi ciency of 95% to 100% is equivalent to a slope of
56.20 to 59.16 mV/pH.
Measuring Range:
pH .....................................0 to 14
ORP ..................................±2000 mV
3-2726-LC......................... Low Conductivity fl uids (20 to 100 μS/cm)
≤ 20 μS/cm ...................
3-2724-HF, 3-2726-HF,
3-2734-HF, 3-2736-HF...... Hydrofl uric acid resistant glass,
For applications where hydrofl uoric acid, in concentrations of 2% or less,
will attack standard pH glass in levels of pH 6 and below, or in situations
where process upsets may temporarily drop to these pH levels.
Environmental Requirements
Operating Temperature
2724-2726* ................................. -10 °C to 85 °C (14 °F to 185 °F)
2734-2736* ................................. 10 °C to 100 °C (50 °F to 212 °F)
* Best performance for 3-2724-HF, 3-2726-HF, 3-2734-HF,
3-2736-HF is above 10 °C (50 °F)
Operating Pressure Range
2724-2726:
• 0 to 6.9 bar (0 to 100 psi) @ -10 °C to 65 °C (14 °F to 149 °F)
• Linearity Derated 6.9 to 4.0 bar (100 to 58 psi) @
65 °C to 85 °C (149 °F to 185 °F)
2734-2736:
• 0 to 6.9 bar (0 to 100 psi) @ 10 °C to 65 °C (50 °F to 149 °F)
• Linearity Derated 6.9 to 4.0 bar (100 to 58 psi) @
65 °C to 100 °C (149 °F to 212 °F)
Recommended storage temperature
pH/ORP electrodes ..................... 0 °C to 50 °C (32 °F to 122 °F)
• The electrode glass will shatter if shipped or stored at
temperatures below 0 °C (32 °F).
• The performance life of the electrode will be shortened if
DO NOT
FREEZE
stored at temperatures above 50 °C (122 °F).
Standards and Approvals
• Manufactured under ISO 9001 for Quality,
ISO 14001 for Environmental Management and
OHSAS 18001 for Occupational Health and Safety.
• RoHS Compliant
China RoHS (Go to www.gfsignet.com for details)
2760 pH/ORP preamplifi er (2724-2726 only)
8900 Multi-Parameter Controller
or Signet fl ow fi ttings
Platinum
Flow must be less than 150 ml/min. in a
properly grounded system
pH 6 or below; trace HF ≤ 2%
Signet 2724-2726 and 2734-2736 Series pH and ORP Electrodes
3
Page 4
Sensor Installation and Removal
In-Line Installation
1. The electrode can be
mounted at any angle.
Yes
2. Avoid air pockets and sediment.
3. The fi tting must place the
electrode in the fl ow but
0°
Horizontal
must not bottom out in the pipe.
4. Select a Signet installation
fi tting for convenience.
Yes
5. Use the ¾ in. threads on the
electrode body to install the
electrode into reducing tee fi ttings.
6. Inspect threads to ensure integrity. Do not install an electrode
with damaged threads.
7. Apply PTFE tape to the process connection threads,
in accordance with industry standards.
8. Use piping installation hardware with smooth,
well-fi nished threads to facilitate the installation.
9. If necessary, the pipe should be plumbed with a depression
(trap) so liquid is maintained around the electrode tip.
10. Hand-tighten the electrode into the process connection.
Do not use any tools to install the electrode.
The use of wrenches, pliers or similar may over-stress
the sensor body and lead to breakage and subsequent
spillage of the process liquid.
CAUTION:
A broken sensor may be
ejected forcefully from the fi tting
and can cause severe injury.
11. The safety instructions have an
adhesive label and should be placed
near the sensor.
Yes
Yes
Yes
3-2700.615 (B-04/08)
WARNING
SAFETY INSTRUCTIONS
1. Use appropriate eye, face, hand, body
and/or respiratory protection when using
chemicals or solvents
2. Prior to installation or removal:
a. Depressurize and vent system
b. Drain below sensor level
3. Confirm chemical compatibility before use
4. Do not exceed the maximum
temperature/pressure specifications
5. Do not alter product construction
If installing into a threaded connection:
6. Inspect threads to ensure integrity. Do not
install a sensor that has damaged threads
7. Apply PTFE tape to the process connection
threads in accordance with industry
practices
8. Hand tighten the sensor into the process
connection. DO NOT USE TOOLS
Failure to follow
these instructions may
result in personal injury
See peel & stick warning label on back!
Attach near sensor
Low Conductivity Installation
• The 3-2726-LC pH electrodes can be used in
low conductivity water of less than 100 μS.
• When used in the range of 20 to 100 μS,
the fl ow range must not exceed 1 m/s (3 ft/s) velocity.
• When used in liquids of less than 20 μS,
the fl ow range must not exceed 150 ml/min;
the sensor should also be mounted in a well grounded cell.
Yes
3-2750-X or
3-2760-X
Submersible
Preamplifi er
Lubricate
O-rings with a
non-petroleum
based, viscous
lubricant (grease)
compatible with
the system.
Flexible conduit
PTFE tape
Fitting (customer supplied)Electrode
3-2750-X
or 3-2760-X1
In-Line
Preamplifi er
Lubricate O-rings
with non-petroleum
based, viscous
lubricant (grease)
compatible with
the system.
Electrode
Flexible
conduit
Signet Installation Fitting DN15 to DN100 (½ in. to 4 in.)
Do not use as a handle!
• Do not use tools or lubricant
to install yellow retaining cap.
• Do not overtighten.
3-2700.615 (B-04/08)
WARNING
SAFETY INSTRUCTIONS
1. Use appropriate eye, face, hand, body
and/or respiratory protection when using
chemicals or solvents
2. Prior to installation or removal:
a. Depressurize and vent system
b. Drain below sensor level
3. Confirm chemical compatibility before use
4. Do not exceed the maximum
temperature/pressure specifications
5. Do not alter product construction
If installing into a threaded connection:
6. Inspect threads to ensure integrity. Do not
install a sensor that has damaged threads
7. Apply PTFE tape to the process connection
threads in accordance with industry
practices
8. Hand tighten the sensor into the process
connection. DO NOT USE TOOLS
Failure to follow
these instructions may
result in personal injury
non-petroleum based,
(grease) compatible
Lubricate
O-rings with
viscous lubricant
with the system.
3-2700.615 (B-04/08)
WARNING
SAFETY INSTRUCTIONS
1. Use appropriate eye, face, hand, body
and/or respiratory protection when using
chemicals or solvents
2. Prior to installation or removal:
a. Depressurize and vent system
b. Drain below sensor level
3. Confirm chemical compatibility before use
4. Do not exceed the maximum
temperature/pressure specifications
5. Do not alter product construction
If installing into a threaded connection:
6. Inspect threads to ensure integrity. Do not
install a sensor that has damaged threads
7. Apply PTFE tape to the process connection
threads in accordance with industry
practices
8. Hand tighten the sensor into the process
connection. DO NOT USE TOOLS
Failure to follow
these instructions may
result in personal injury
PTFE tape
3-2700.615 (B-04/08)
WARNING
SAFETY INSTRUCTIONS
1. Use appropriate eye, face, hand, body
and/or respiratory protection when using
chemicals or solvents
2. Prior to installation or removal:
a. Depressurize and vent system
b. Drain below sensor level
3. Confirm chemical compatibility before use
4. Do not exceed the maximum
temperature/pressure specifications
5. Do not alter product construction
If installing into a threaded connection:
6. Inspect threads to ensure integrity. Do not
install a sensor that has damaged threads
7. Apply PTFE tape to the process connection
threads in accordance with industry
practices
8. Hand tighten the sensor into the process
connection. DO NOT USE TOOLS
Failure to follow
these instructions may
result in personal injury
4
Signet 2724-2726 and 2734-2736 Series pH and ORP Electrodes
Page 5
Signet Installation Fittings
Type Description Type Description
Plastic tees
PVC saddles
$YDLODEOHLQòLQWRLQVL]HV
39&&39&ZVROYHQWFHPHQWVRFNHW
39')RU33ZXQLRQHQGILWWLQJV
$YDLODEOHLQLQWRLQVL]HV
5HTXLUHVLQKROHLQSLSH
&DUERQVWHHO
ZHOGROHWV
&DUERQVWHHO
WKUHDGHGWHHV
Submersible Installation
$YDLODEOHLQLQWRLQVL]HV
5HTXLUHVLQKROHLQSLSH
,QVWDOOE\FHUWLILHGZHOGHURQO\
$YDLODEOHLQòLQWRLQVL]HV
)HPDOH137HQGV
Iron
strap-on
saddles
$YDLODEOHLQLQWRLQVL]HV
5HTXLUHVLQKROHLQSLSH
Removing from In-Line Installations
• The use of this product assumes
that operators are trained and are
familiar with this type of device.
• They should be knowledgeable of
the potential risks associated with
pressurized piping systems.
• Operators MUST follow all
necessary safety procedures.
Submersible Installations
The user must supply the following hardware
to complete a submersible installation:
• ¾ in. NPT threaded pipe or conduit
• Wiring junction box
• Pipe clamps (quick-release type recommended)
• Tank fl ange for closed tanks
2724-2726 / 2734-2736 with 2750/2760 Preamplifi er
8QLYHUVDO
pipe adapters
8VHIRULQVWDOODWLRQLQSLSHV!LQóLQ137
39&&39&RU39')YHUVLRQV
6SHFLI\VRFNHWRUóLQFK137PDOHWKUHDGV
In-line removal Instructions:
1. Depressurize and vent the piping system.
2. Drain the system to below sensor level.
3. Wear safety goggles or face shield during removal.
Use all appropriate eye, face, hand, body and/or respiratory
protection when working with chemicals or solvents.
4. Place a Lockout tag on the pipe when the sensor is
removed for maintenance to prevent accidental opening
and exposure to potentially hazardous chemicals.
Technical Note:
• Mount the electrode near tank outlets,
away from reagent addition areas.
• Use the ¾ in. threads at the top of the preamplifi er
to run the cable inside pipe or conduit.
• Place the electrode tip in pH 4 buffer during system
maintenance or storage to avoid dehydration.
1
2
3
3
4
Fill with
Lubricate
O-rings
3 to 4 in.
of sealant
Open
tanks
Closed
tanks
The Signet pH/ORP electrodes are designed to install in tanks by attaching conduit to the ¾ in. threads at the top of the
accompanying preamplifi er or sensor electronics:
1. The O-ring at the top of the electrode fi ts very tightly into the preamplifi er. Use a small amount of non-petroleum based
lubricant to assist the assembly.
2. To prevent moisture from migrating into the preamplifi er, backfi ll the conduit with 3 in. to 4 in. of sealant.
3. Mount electrodes in a location with ample clearance to remove them for periodic cleaning and recalibration.
4. Choose a location that keeps the electrode glass completely submersed at all times.
Signet 2724-2726 and 2734-2736 Series pH and ORP Electrodes
5
Page 6
Calibration
pH System Calibration
There are two functions in a pH electrode that require the system to be calibrated:
Temperature
• The temperature output of the electrode (from a 3K Balco or PT1000 RTD) must be calibrated only once.
When a new electrode is installed, it does not need to be repeated.
• Because the temperature measurement has a signifi cant infl uence on the electrochemical measurement,
the temperature output in new pH electrodes should always be calibrated before the pH/mV calibration.
NOTE: All Signet transmitters and controllers incorporate automatic temperature compensation.
pH error due to temperature changes in fl uid
°C pH 2 pH 3 pH 4 pH 5 pH 6 pH 7 pH 8 pH 9 pH 10 pH 11 pH 12
0.15 0.12 0.09 **0.06 0.03 0 0.03 0.06 0.09 0.12 0.15
15
25
35
45
Table 1
As the pH value moves away from neutral (7 pH) or the temperature moves away from 25 ºC,
the electrochemical output is affected.
* Example: At pH 5 the mV output of the electrode is not affected if the temperature is at 25 °C.
** The electrode output will be shifted by 0.06 pH units if the temperature is reduced to 15 °C.
55
000* 0 0000000
0.15 0.12 0.09 0.06 0.03 0 0.03 0.06 0.09 0.12 0.15
0.3 0.24 0.18 0.12 0.06 0 0.06 0.12 0.18 0.24 0.3
0.45 0.36 0.27 0.18 0.09 0 0.09 0.18 0.27 0.36 0.45
Electrochemical pH vs. mV Ratio
• The mV output from the electrode is created by the interaction of the electrode and the fl uid.
• The electrode contains a gel that depletes over time, so the instrument must be readjusted periodically to
maintain system accuracy.
• The need for recalibration varies with each application, but the life of the electrode is usually consistent.
• Keep a maintenance log to establish a depletion trend in new systems.
• The mV calibration is a two-point procedure.
• Signet offers pH buffer solutions prepared specifi cally for this purpose.
• pH buffer solutions can be used for calibrating more than one sensor within a day provided that the solutions
are protected from debris and are not diluted by rinse water from the calibration procedure.
• Use clean water to rinse buffer solutions from the electrode.
• Dispose of all buffer solutions at the end of the day.
• If the pH sensor will not calibrate within acceptable limits, clean the electrode and recalibrate.
• If the calibration results remain outside of acceptable limits, the sensor is depleted and must be replaced.
• Follow the guidelines of local waste disposal regulations when discarding buffer solutions and spent electrodes.
ORP System Calibration
Theoretical mV
Values @ 25 °C
pH mV
2 +295.8
3 +236.64
4 +177.48
5 +118.32
6 +59.16
70
8 –59.16
9 –118.32
10 –177.48
11 –236.64
12 –295.8
Table 2
Electrode slope is the
ratio of mV to pH units.
At 25 °C the theoretical
slope is 59.16 mV per pH.
ORP electrodes do not incorporate a temperature sensor, so the only system calibration required is the electrochemical adjustment.
Electrochemical ORP vs. mV Ratio
• ORP measurements are relative values, and single-point adjustments are suffi cient for most applications.
• Calibration should be done using ORP test solutions such as Zobell's solution, Light's solution, or in pH buffers that have been
saturated with quinhydrone (Table 3). Quinhydrone is the oxidizer that is measured by the ORP electrode.
• Zobell's solution and Light's solution are not compatible with the AutoCal function in Signet pH instrumentation.
• A new ORP electrode measures the listed values ±15 mV.
• The ORP electrode is functional until the offset exceeds 50 mV.
• An electrode whose offset measures greater than 50 mV should be cleaned or replaced if necessary.
• ORP solutions made with quinhydrone are very unstable and may not read properly after being exposed to air for a prolonged time.
These solutions must be discarded after a few hours.
• Dispose of all calibration solutions in accordance with local, state and federal guidelines.
• Use clean water to rinse buffer solutions from the sensors.
Table 3:
ORP test solutions
*Saturate 50 mL of pH 4 or
pH 7 buffer with 1/8 g quinhydrone
6
Signet 2724-2726 and 2734-2736 Series pH and ORP Electrodes
ORP at 20 °C 268 mV 92 mV
ORP at 25 °C 228 mV 469 mV 263 mV 86 mV
ORP at 30 °C 258 mV 79 mV
Zobell's
solution
Light's
solution
4 pH buffer
w/quinhydrone*
7 pH buffer
w/quinhydrone*
Page 7
Maintenance and Cleaning
K4
K4
Electrode Date Code
• The electrode date code indicates the
manufacturing date of the electrode.
• Electrodes should be put into service as
soon as possible and should not remain in
the box for more than two years.
• Over time, the storage solution (found in
the "boot" covering the electrode tip) will
evaporate or leak, allowing the delicate
sensing tip and reference junction to dry.
• To rehydrate a dry electrode, soak it in
pH 4 buffer for 24 to 48 hours.
• Electrodes more than 2 years old may still be
functional, but will take longer to rehydrate.
• Restoration may not be effective for severely
dehydrated electrodes.
Letter = Month
N = January
M = February
L = March
K = April
J = May
H = June
G = July
F = August
E = September
D = October
C = November
B = December
K4
K4
Example: K8 = manufactured in April 2013
Numeral = Year
5 = 2010
6 = 2011
7 = 2012
8 = 2013
9 = 2014
0 = 2015
1 = 2016
2 = 2017
3 = 2018
4 = 2019
5 = 2020
6 = 2021
Electrode Care and Application
pH/ORP electrodes are similar to batteries; they age with time and usage.
The following information will help maximize electrode life.
General Tips:
• To ensure uninterrupted operation of critical pH systems, replacement electrodes should be available.
• Store boxed electrodes fl at or upright (electrode tip down) to maximize hydration of the glass surface.
• Keep the glass surface wet at all times.
• Soak the sensor tip in pH 4.0 buffer during system maintenance intervals.
• If the sensor dehydrates, soak the sensor tip in pH 4 buffer for 24 to 48 hours,
then visually inspect the electrode for surface cracks, swelling, or discoloration.
• It may not be possible to restore severely dehydrated electrodes to normal operation.
• High temperatures, strong acids or caustics will increase electrochemical reactions and speed electrode aging.
• Coatings (e.g. grease) on the glass or junction surfaces cause extended response time and inaccurate measurement.
• Never store the electrode tip in deionized (DI) water. Use pH 4 buffer solution to keep the glass wet when out of the process.
• Never store the electrode at temperatures below 0 °C (32 °F) or allow it to dehydrate.
• Never scrape or sand the glass electrode surface.
• Treat glass electrode surfaces with care to prevent accidental breakage.
Cleaning
Problem Suggested Solution
Use a dilute acid solution (HCl solution of 5% or less). If the electrode has been used in
applications with a pH value higher than 7 pH, soak the electrode for 2 to 5 minutes.
Hard Coatings
Soft Coatings
Oily or Organic Coatings
ORP Platinum Coating Gently wipe the electrode surfaces with a paper towel.
After Cleaning
Use a dilute alkaline solution (NaOH solution at 5% or less) if the electrode has been used in
applications with pH values less than 7 pH, soak the electrode for 2 to 5 minutes.
Alternating immersion in acidic and alkaline solutions may be necessary for thorough cleaning.
Spray or vigorously stir the electrode with a mild detergent, such as dishwashing liquid.
Chlorine bleach can also be used.
Spray or vigorously stir the electrode with a mild detergent or an appropriate solvent that
will not attack the materials of construction. (isopropyl alcohol or similar)
Always rinse the electrode with water after cleaning.
Soak the electrode in a pH 4 buffer (with KCl if available) for at least 10 minutes after cleaning.
Signet 2724-2726 and 2734-2736 Series pH and ORP Electrodes
7
Page 8
Ordering Information
Ordering Information
2724-2726 and 2734-2736 pH/ORP Electrodes
Mfr. Part No. Code Description
3-2724-00 159 001 545 Electrode, pH, fl at, PT1000, ¾ in. NPT
3-2724-01 159 001 546 Electrode, pH, fl at, PT1000, ISO 7/1 R¾
3-2724-10 159 001 547 Electrode, pH, fl at, 3K Balco, ¾ in. NPT
3-2724-11 159 001 548 Electrode, pH, fl at, 3K Balco, ISO 7/1 R¾
3-2724-HF-10 159 001 771 Electrode, pH, HF resistant, fl at, 3K Balco, ¾ in. NPT
3-2724-HF-11 159 001 772 Electrode, pH, HF resistant, fl at, 3K Balco, ISO 7/1 R¾
3-2726-00 159 001 553 Electrode, pH, bulb, PT1000, ¾ in. NPT
3-2726-01 159 001 554 Electrode, pH, bulb, PT1000, ISO 7/1 R¾
3-2726-10 159 001 555 Electrode, pH, bulb, 3K Balco, ¾ in. NPT
3-2726-11 159 001 556 Electrode, pH, bulb, 3K Balco, ISO 7/1 R¾
3-2726-HF-00 159 001 549 Electrode, pH, HF resistant, bulb, PT1000, ¾ in. NPT
3-2726-HF-01 159 001 550 Electrode, pH, HF resistant, bulb, PT1000, ISO 7/1 R¾
3-2726-HF-10 159 001 551 Electrode, pH, HF resistant, bulb, 3K Balco, ¾ in. NPT
3-2726-HF-11 159 001 552 Electrode, pH, HF resistant, bulb, 3K Balco, ISO 7/1 R¾
3-2726-LC-00 159 001 557 Electrode, pH, bulb, Low Cond, PT1000, ¾ in. NPT
3-2726-LC-01 159 001 558 Electrode, pH, bulb, Low Cond, PT1000, ISO 7/1 R¾
3-2726-LC-10 159 001 559 Electrode, pH, bulb, Low Cond, 3K Balco, ¾ in. NPT
3-2726-LC-11 159 001 560 Electrode, pH, bulb, Low Cond, 3K Balco, ISO 7/1 R¾
3-2725-60 159 001 561 Electrode, ORP, fl at, 10 KΩID, ¾ in. NPT
3-2725-61 159 001 562 Electrode, ORP, fl at, 10 KΩID, ISO 7/1 R¾
3-2734-00 159 001 774 Electrode, pH, fl at, PT1000, ¾ in. NPT **
3-2734-01 159 001 775 Electrode, pH, fl at, PT1000, ISO 7/1 R¾ **
3-2734-HF-00 159 001 776 Electrode, pH, HF resistant, fl at, PT1000, ¾ in. NPT **
3-2734-HF-01 159 001 777 Electrode, pH, HF resistant, fl at, PT1000, ISO 7/1 R¾ **
3-2736-00 159 001 778 Electrode, pH, bulb, PT1000, ¾ in. NPT **
3-2736-01 159 001 779 Electrode, pH, bulb, PT1000, ISO 7/1 R¾ **
3-2736-HF-00 159 001 780 Electrode, pH, HF resistant, bulb, PT1000, ¾ in. NPT **
3-2736-HF-01 159 001 781 Electrode, pH, HF resistant, bulb, PT1000, ISO 7/1 R¾ **
3-2735-60 159 001 782 Electrode, ORP, fl at, 10 KΩID, ¾ in. NPT
3-2735-61 159 001 783 Electrode, ORP, fl at, 10 KΩID, ISO 7/1 R¾
Accessories and Replacement Parts
Mfr. Part No. Code Description
3-2750-1 159 000 744 In-line Sensor Electronics w/Junction Box
3-2750-2 159 000 745 In-line Sensor Electronics w/Junction Box and EasyCal
3-2750-3 159 000 746 Submersible Sensor Electronics with 15 ft cable, ¾ in. NPT threads
3-2750-4 159 000 842 Submersible Sensor Electronics with 15 ft cable, ISO 7/1 R¾ threads
3-2750-7 159 001 671 pH Electronics, Digital (S3L), 4.6 m (15 ft) cable
3-2760-1 159 000 939 Submersible Preamplifi er with ¾ in. NPT threads and 4.6 m (15 ft) cable
3-2760-2 159 000 940 Submersible Preamplifi er with ¾ in. ISO threads and 4.6 m (15 ft) cable
3-2760-3 159 000 941 Submersible Connector with 4.6 m (15 ft) cable and ¾ in. NPT threads
3-2760-4 159 000 942 Submersible Connector with 4.6 m (15 ft) cable and ISO 7/1 R¾ in. threads
3-2760-11 159 001 367 In-line Preamplifi er with ¾ in. NPT threads and 4.6 m (15 ft) cable
3-2760-21 159 001 368 In-line Preamplifi er with ¾ in. ISO threads and 4.6 m (15 ft) cable
3-2760-31 159 001 369 In-line Connector with 4.6 m (15 ft) cable and ¾ in. NPT threads
3-2760-41 159 001 370 In-line Connector with 4.6 m (15 ft) cable and ISO 7/1 R¾ threads
3-2759 159 000 762 pH/ORP System Tester (adapter cable sold separately)
3-2759.391 159 000 764 2759 DryLoc Adapter Cable (for use with 2750 and 2760)
3-0700.390 198 864 403 pH Buffer Kit (1 each 4, 7, 10 pH buffer in powder form, makes 50 mL)
3822-7004 159 001 581 pH 4 buffer solution, pint (16 oz) (473 ml)
3822-7007 159 001 582 pH 7 buffer solution, pint (16 oz) (473 ml)
3822-7010 159 001 583 pH 10 buffer solution, pint (16 oz) (473 ml)
3822-7115 159 001 606 20 gram bottle Quinhydrone for ORP calibration
3-2700.395 159 001 605 Calibration kit: 3 Polypropylene cups, box used as cup stand, 1 pint pH 4.01, 1 pint pH 7.00
3-8050.390-1 159 001 702 Retaining Nut, Replacement, Valox
®
, K4530
**Use with 2750 Sensor Electronics
Georg Fischer Signet LLC, 3401 Aero Jet Avenue, El Monte, CA 91731-2882 U.S.A. • Tel. (626) 571-2770 • Fax (626) 573-2057
For Worldwide Sales and Service, visit our website: www.gfsignet.com • Or call (in the U.S.): (800) 854-4090
For the most up-to-date information, please refer to our website at www.gfsignet.com
3-2724.090 Rev H 11/13 English © Georg Fischer Signet LLC 2013
Loading...