Georg Fischer 2724 Operating Manual

Signet 2724-2726 and 2734-2736 Series DryLoc pH and ORP Electrodes

*3-2724.090*

3-2724.090 Rev. 20 10/19

Operating Instructions

Description

English

2724 & 2725
2734 & 2735

Flat Style
Electrode

2726 & 2736

Protected

Bulb Style

Electrode

Signet General Purpose 2724-2726 and High Performance 2734-2736 series of pH and
ORP electrodes are designed to minimize maintenance time and maximize performance
longevity and 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 range 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 ranging
from 0.5" to 4" size.

• Combine the 2724-2726 or 2734-2736 electrodes with the Signet 2751 Smart
Sensor Electronics or the 2760 Preamplifi er to provide a 4 to 20 mA loop to a
Programmable Logic Controller (PLC), SCADA system, or datalogger.

• Memory chip enabled to store Manufacturing, Calibration and Operational Data.

- Manufacturing Information (Serial Number, Model Number, and Factory
Glass Impedance).

- Calibration Information (Factory Calibration pH/ORP, Factory Calibration
Temperature, User Calibration pH/ ORP, User Calibration Temperature,
Offset pH/ORP and Slope Effi ciency % pH/ORP).

- Operational Data (Sensor Runtime Hours, Minimum & Maximum Measured
pH/ ORP, and Minimum and Maximum Measured Temperature).

• English

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• 뭨펯

California Prop. 65

WARNING:

Cancer and Reproductive Harm

www.p65warnings.ca.gov

• For more fl exibility and unique features, pair the 2724-2726 or 2734-2736 series
a 2751 Smart Sensor Electronics and the 9900 Transmitter, 9950 Dual Channel
Transmitter or the 0486 Profi bus Concentrator. Additional features include electrode
health monitoring and diagnostics through glass impedance measurement, broken
glass detection and reference impedance measurement. Convenient remote
calibration eliminates the hassle of fi eld calibration.

• Connect up to six 2724-2726 or 2734-2736 electrodes to one 8900 Multi-Parameter
Controller with six 2751 pH/ORP Sensor Electronics using digital (S3L) serial data
output.

• Connect up to two 2724-2726 or 2734-2736 electrodes to one 9950 Dual Channel
Transmitter with two 2751 pH/ORP Sensor Electronics using digital (S3L) output for a
truly amazing set of features, options and measurements.

• The 2724-2726 electrodes are recommended for general purpose applications.

• The High Performance 2734-2736 electrodes are recommended for harsh
applications.

• The 2734-2736 electrodes utilize advanced reference technology and special
formulation glass to extend electrode life in all applications.

with

Warranty Information

Chemical Compatibility

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,
glass,

chemical poisoning, dry-out) or mishandling (e.g. broken

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.

Safety Information

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 3/4" M-NPT or ISO 7/1-R 3/4 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.

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.

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

DO NOT
FREEZE

freezable liquids.
Freezing damage to pH, ORP, and Chlorine electrodes
voids product warranty.

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.

Dimensions

2724, 2725, 2734, & 2735 Flat Glass Electrode

Threads:

¾ in. NPT or

95.76 mm
(3.77 in.)

19.05 mm
(0.75 in.)

25.4 mm

(1.0 in.)

2726 & 2736 Protected Bulb Glass Electrode

95.76 mm
(3.77 in.)

19.05 mm
(0.75 in.)

25.4 mm

(1.0 in.)

8.89 mm
(0.35 in.)

ISO 7/1 R¾

6.35 mm
(0.25 in.)

44.45 mm
(1.75 in.)

18.3 mm
(0.72 in.)

Threads:

¾ in. NPT or

ISO 7/1 R¾

6.35 mm
(0.25 in.)

53.34 mm
(2.1 in.)

18.3 mm
(0.72 in.)

2

Signet 2724-2726 and 2734-2736 Series pH and ORP Electrodes

Specifi cations

General

Compatibility ................... 2751 pH/ORP Smart Sensor Electronics,

2760 pH/ORP Preamplifi er

(2724-2726 3K Balco only)
pH Temp. Sensor:

Pt1000 ............................ Compatible with 2751 pH/ORP Smart

Sensor Electronics

Connection to ............. PLC, 9900 Transmitter,

8900 Multi-Parameter Controller

9950 Dual Channel Transmitter

3 K Balco ..................... Compatible with 2760 Preamplifi er

Connection to ............. 8750 pH/ORP Transmitter

Process Connection ....... ¾ in. NPT, ISO 7/1 R¾ threads,

or Signet Installation Fittings 0.5" to 4" sizes

Wetted Materials

pH (2724 & 2726) ........... Ryton (PPS), glass, UHMW PE, FKM

ORP (2725) .................... Ryton (PPS), glass, UHMW PE, FKM,

Platinum

pH (2734 & 2736) ........... Ryton (PPS), glass, PTFE, FKM

ORP (2735) .................... Ryton (PPS), glass, PTFE, FKM, Platinum

Shipping Weight ........... 0.25 kg (0.55 lb)

Performance
Effi ciency

2724-2726 ...................... > 97% @ 25 °C (77 °F)

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 S/cm)

 20 S/cm ................. Flow must be less than 150 ml/min. in a

properly grounded system
3-2724-HF, 3-2726-HF, 3-2734-HF, 3-2736-HF:

Hydrofl uric acid resistant glass, pH 6 or below; trace HF  2%
For applications where hydrofl uoric acid, in concentrations of 2%

or less, will attack standard pH glass 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)
Note: The Sensor Electronics must be remotely mounted when
the temperature exceeds 85 °C (185 °F)

Maximum Temperature and Pressure Rating

10.3

150

8.6

125

6.9

100

273X

272X

5.2

75

3.4

50

1.7

25

(bar)(psi)

0

°C

-40

°F

-40 -4 32

Standards and Approvals

• CE, WEEE, RoHS Compliant

• Manufactured under ISO 9001 for Quality,
ISO 14001 for Environmental Management and
OHSAS 18001 for Occupational Health and Safety.

China RoHS (Go to www.gfsignet.com for details)

Declaration of Conformity according to FCC Part 15

This device complies with Part 15 of the FCC rules.
Operation is subject to the following two conditions:
(1) This device may not cause harmful interference, and
(2) This device must accept any interference received,
including interference that may cause undesired operation.

REACH Information Obligation: in accordance with
Article 33 of the European REACh Regulation (EC)
No. 1907/2006, the substances Lead and Acrylamide
are present in the glass matrix and as a polymerized gel
respectively; in a concentration >0.1% (w/w). During normal
use, the articles do not pose any risks and no additional
information is required for safe use.

-20

272X

0

273X

20
68

40

60

104

140 176 212

80

100

120
248

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

DO NOT
FREEZE

if stored at temperatures above 50 °C (122 °F).

Signet 2724-2726 and 2734-2736 Series pH and ORP Electrodes

3

In-Line Installation

1. The electrode can be
mounted at any angle.

Yes

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 (0.5" to 4" size range) for
convenience. Lightly lubricate

Yes

Yes

Yes

O-ring with a non-petroleum
based lubricate (grease)
compatible with the system.

NOTE:

When mounting in a standard threaded fi tting,
the electrode must be mounted horizontal to 60 degrees
below horizontal position only:

5. Use the ¾ in. M-NPT or
ISO 7/1-R ¾ threads on

NO NO

NO

the electrode body to
install the electrode into
reducing tee fi ttings.

6. Inspect threads to ensure

YESYES

integrity. Do not install an
electrode with damaged
threads.

NO

270°

7. Apply PTFE tape to
the M-NPT or ISO 7/1-R ¾ 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.

3-2700.615 (B-04/08)

WARNING

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.

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

Yes

3-2751-X
3-2760-X
Submersible
Preamplifi er

Lightly lubricate
O-ring with a
non-petroleum
based lubricate
(grease)
compatible with
the system.

Flexible conduit

PTFE tape

Fitting (customer supplied)Electrode

3-2751-X,

3-2760-X1

In-Line

Preamplifi er

Lightly lubricate
O-ring with a
non-petroleum
based lubricate
(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.

Lightly lubricate O-ring

with a non-petroleum

based lubricate

(grease) compatible

with the system.

Low Conductivity Installation

• The 3-2726-LC pH electrodes can be used in

low conductivity water of less than 100 S.

• When used in the range of 20 to 100 S,

the fl ow range must not exceed 1 m/s (3 ft/s) velocity.

• When used in liquids of less than 20 S,

the fl ow range must not exceed 150 ml/min;
the sensor should also be mounted in a well grounded cell.

4

Signet 2724-2726 and 2734-2736 Series pH and ORP Electrodes

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

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

these instructions may
result in personal injury

GF Signet Installation Fittings 0.5" to 4"

3-2700.615 (B-04/08)

WARNING

Failure to follow

Customer supplied Tee,
or Reducing Tee

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