Georg Fischer 2734 Operating Manual

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

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

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

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