Georg Fischer SIGNET 2714-2717 User Manual

Signet 2714-2717 Twist-Lock pH/ORP Electrodes

4

4

4

Features

• Durable CPVC or
glass body with
Twist-Lock connector

• Flat or bulb surfaced
electrodes available

Protected bulb Flat surface

Description

Feature-packed Signet 2714-2717
Twist-Lock pH & ORP Electrodes
provide unsurpassed simplicity, reli­ability and accuracy for a wide variety
of industrial applications. Rugged
construction, large reference volume
and intelligent positioning of inter­nal elements combine to extend the
service-life of these dependable and
highly responsive electrodes. Flat ver­sions allow sediment and particles to
sweep past the measurement surface,

System Overview

Signet Instrument
(sold separately)

678

RELAY 2

10

RELAY 1

pH

12

2

14

0

ENTER

5700 8750

In-Line Installation

Pipe, Tank, Wall MountPanel Mount

Signet pH/ORP
Transmitter
(sold separately)

Signet Universal
Adapter Kit

(sold separately)

(3-8050)

Submersible Installation

Panel, Pipe, Tank, Wall Mount

Compatible with

the 2720

Preamplifier

Wet-Tap

minimizing risks of abrasion, break­age and coating. The unique Twist­Lock design enables sensor connec­tions to the Signet 2720 preamplifier
in one easy motion. The integral
temperature sensor built into the pH
electrode or the I.D. resistor in the
ORP electrodes is used for automatic
sensor recognition by Signet pH/ORP
instrumentation, adding convenience
and versatility to our systems.

Wet-Tap Installation

Signet Instrument
(sold separately)

678

RELAY 2

10

RELAY 1

pH

12

2

14

0

ENTER

5700 8750

Panel, Pipe, Tank, Wall Mount

Signet Instrument
(sold separately)

678

RELAY 2

10

RELAY 1

pH

12

2

14

0

ENTER

5700 8750

• Large reference

volume and solid

polymer electrolyte

• Integrated tempera­ture sensor (pH)

• Designed for maxi­mum protection

from process
contamination

• DI option (pH) for
pure water use

(<100 μS)

• HF option (pH) for

applications contain-

ing trace amounts of
HF (<2%)

Applications

• Water & Wastewater
Treatment

• Neutralization
Systems

• Effluent Monitoring

• Sanitization Systems

• Commercial Pools &
Spas

• Aquatic Animal Life
Support Systems

• Process Control

• Cooling Towers

• Boiler Protection

Signet

2714-2717
pH/ORP
Electrode with
2720
Preamplifier
(each sold
separately)

Signet sensor cap
(sold separately)

Signet Fittings*
(sold separately)

Signet

2714-2717
pH/ORP
Electrode with
2720
Preamplifier
(each sold
separately)

Pipe extension
or conduit
with 3/4 in.
NPT or
ISO 7/1-R
3/4 threads
(customer supplied)

Signet 2714-2717

pH/ORP Electrode
with Signet 2720
Preamplifier

Signet
2716-WT

2717-WT and
2720 preamp.
(sold separately)

Signet 3719
WetTap Assembly
(sold separately)

Signet Fittings*
(sold separately)

* See Fittings section for more information.

84

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Dimensions

/

2714/2714-HF pH Electrode
2715 Flat ORP Electrode

27 mm/

1.0 in.

28.7 mm/

1.1 in.

64 mm/

2.5 in.

23 mm/

0.9 in.

2716/2716-DI Bulb pH Electrode
2717 Bulb ORP Electrode

27 mm/

1.0 in.

28.7 mm/

1.1 in.

64 mm/

2.5 in.

23 mm/

0.9 in.

2716-WT and 2717-WT
WetTap Electrode

FPM
o-rings

11.9mm
(.47 in.)

pH
Bulb

92 mm/

3.6 in.

92 mm/

3.6 in.

Twist-Lock
Connector

PG-13.5 Threads

209 mm
(8.23 in.)

102 mm/

4.0 in.

110 mm

4.4 in.

ORP
Platinum
Band

Specifications

2714 - 2717 pH/ORP Electrodes
General

Operating Range:

• 2714, 2716, 2716-DI: 0 to 14 pH

• 2714-HF: 0 to 12 pH

• 2715, 2717: ± 2,000mV

Pipe Size Range:

0.5 in. and up: use Signet installation
fittings from 0.5 to 4.0 in. (use pipe

adapter in pipes over 4 in.)

Mounting:

• In-line pipe mounting: > 50° to the
horizontal plane

• Submersion with 3-2720 preamplifier
requires 3/4 in. NPT or ISO 7-1/R 3/4 in.
Male threaded extension.

Efficiency: > 97% @ 25°C (77°F)
pH Response Time:
< 5 secs. for 95% of signal change
ORP response time: application dependent

Reference:
Electrolyte: Solidified Acrylamide Gel

• 3.5M KCI

• 0.1 M KCl (2716-DI only)

Secondary junction: Nylon filament
Element: Ag/AgCl

Primary Functions:

• 2714/2715: Flat surface resists fouling

• 2716/2717: Bulb surface for general use

• 2714-HF: Extended use in applications
with trace hydrofluoric acid
( <2%)

• 2716-DI: Extended use in pure waters

(<100 μS)
Temperature Sensor:
3K Balco (3000 Ω = 25°C)
Response Time, τ:

• 2714: 140 secs. • 2716: 196 secs.

Wetted Materials

• Body: CPVC

• O-rings: FPM

• O-ring junction: Porous UHMW

Polyethylene

• Sensing Surface:

glass membrane (pH), platinum (ORP)

Max. Temperature/Pressure Rating

Operating Temperature:

• 2716/2717: 0°C to 85°C (32°F to 185°F)

• 2714/2715: 10°C to 85°C (50°F to185°F)

• 2714-HF: 0°C to 50°C (32F° to 122°F)

Storage Temp.: -10°C (15°F) to 30°C (86°F)
Temperature and Pressure Limit:

• 6.89 bar @ 0°C (100 psi @ 32°F to 149°F)

• 4.00 bar @ 85°C (58 psi @ 150°F to 185°F)

See Temperature and Pressure graphs for more
information.

Shipping Weight: 0.2 kg (0.4 lbs.)

2716-WT and 2717-WT Wet-Tap
pH/ORP Electrodes
General

Operating Range:

• pH: 0 to 14 pH

• ORP: -2000 to +2000 mV
Compatibility:
Signet 3719 Wet-Tap
Connector (CPVC): Twist-Lock

Mounting:
Any angle is acceptable. Use with

3719 wet-tap assembly for mounting
electrodes.

Efficiency: > 97% @ 25°C (77° F)
Response Time:

• pH: < 5sec. for 95% of signal change

• ORP: Application dependent

Reference:
Junctions: Porous PTFE
Electrolyte: 3.5M KCl
Elements: Ag/AgCl

Temp. Sensor (pH):

• 3K Balco (3-2716-WT)

• Temp. Response Time (τ): 438s

Wetted Materials

• Body : Glass

• O-rings: FPM

• Junctions : Porous PTFE

• Sensing surface:
glass Membrane (pH), platinum (ORP)

Max. Temperature/Pressure Rating

Operating Temperature:
0°C to 85°C (32°F to 185°F)
Storage Temperature:
0°C to 85°C (32°F to 185°F)
Temperature and Pressure Limit:

6.9 bar @ 65°C (100 psi @ 149°F)

See Temperature and Pressure graphs for
more information.

Shipping Weight: 0.22 kg (0.5 lb.)

Standards/Approvals

• CE

• Manufactured under ISO 9001:2000
for Quality and ISO 14001: 2004 for
Environmental Management

Choosing

Products

Instrument

Multi-Pa-

rameter

Flow

pH/ORP

Conductivity/

Resistivity

Pressure, Level

Temperature,

Products

Other

Installation

Wiring &

Reference

Technical

Temperature/

Pressure

Graphs

of Terms

Glossary

Reference

Part No.

Index

www.gfsignet.com

85

Specifications (continued)

2720 pH/ORP Preamplifier
General

Input Range: ±2,500 mV
Power Requirements:
±4.5 to ±8 VDC, dual supply (provided

by all Signet pH/ORP instruments)
Maximum Current: < 1 mA, dual supply
Temp. Contact Resistivity: < 0.1Ω
Input Impedance: >1011Ω
Gain: Unity
End Connection: Twist-Lock mount to

Signet 271X Electrodes
Cable Type:
6 conductor, foil shield, w/drain

wire, 24AWG
Cable Length:

4.6 m (15 ft.) supplied; maximum
extension to 120 m (400 ft.)

Wetted Material: CPVC

Max. Temperature/Pressure Rating

Operating Temperature:

• 7 bar (100 psi) max @ 65°C (149°F)

• 4 bar (58 psi) max @ 80°C (176°F)
Storage Temperature:
0°C to 80° C (32°F to 176°F)

See Temperature and Pressure graphs for
more information.

2721 Remote pH/ORP Preamplifier
General

Input power:
±4.5 to ±8 VDC dual supply (provided

by Signet pH/ ORP instruments)

Compatibility: pH sensors with cables

and BNC connector (supplied by other
manufacturers)

Input Impedance: >10

11

Ω

Gain: Unity
Current consumption: <1 mA, dual supply
Electronics assembly:
Epoxy encapsulated

Material:

Housing: Low density polyethylene

Max. Temperature/Pressure Rating

Operating temperature:

-15°C to 65°C (-5°F to 150°F)

2720 Preamplifier

Std. 4.5 m/
15 ft. cable

46mm/

1.8 in.

2714-2717
w/2720 Preamp

182.9 mm

3/4 in. NPT OR
ISO 7/1-R 3/4
female threads

91 mm/

3.6 in.

2714-2717
w/2720 Preamp
with sensor cap

(7.2 in.)

Shipping Weight: 0.5 kg/1.2 lbs.

Standards and Approvals

• CE

• Manufactured under ISO 9001:2000 for

Quality and ISO 14001:2004 for Envi-

ronmental Management

2721 Remote Preamplifier

The 2721 remote preamplifier should
be used with special order sensors that
are built with cables (Signet Models
277X-HT, 277X-1-HT, or other Signet
sensors ordered with cables). It can
also be used for applications where
another manufacturer’s sensor is used
with a Signet 5700 or 8750 instrument.

43 mm
(1.7 in.)

305 mm
(12.2 in.)

30 mm
(1.2 in.)

Female

BNC

connector

2716/17-WT w/ 2720 preamplifier
in 3719 WetTap assembly

76 mm
(3.0 in.)

91 mm
(3.6 in.)

130 mm
(5.13 in.)

49 mm
(1.94 in.)

25 mm

(1.00 in.)

Pipe thread

1.5 or

2 in. NPT

or

ISO 7-R1.5

or 7R2

75 mm
(2.94 in.)

86

20 mm

39 mm
(1.52 in.)

(0.8 in.)

www.gfsignet.com

45 mm
(1.75 in.)

Model 2714-2717 and
Model 2720 Ordering Notes:

1) Electrodes require pur­chase of preamplifier for
full system installation.

2) To replace electrodes,
simply untwist from pre­amplifier to replace with
new electrode.

3) Always purchase a Signet
cap and installation fitting
for pipe applications.

4) Conduit and mounting
brackets for submersible
installation must always
be used (customer sup­plied).

5) Use pipe adapters to in­stall in pipes larger than
DN100 (4 in.). Specify
socket weld or NPT
thread.

6) Use 3-2721 remote pre­amplifier when connect­ing other manufacturers’
electrodes to Signet
instruments.

Ordering Information

Electrode Part Number- Choose either a pH or ORP Electrode
pH Electrodes

3-2714 Flat pH surface electrode
3-2714-HF Flat pH surface electrode, for use in trace HF (hydrofluoric acid) in concentrations < 2%
3-2716 Bulb pH electrode with bulb protection (on plastic body electrodes only)
3-2716-DI Bulb pH electrode with bulb protection, for process liquids <100 μS/cm conductivity

ORP Electrodes

3-2715 Flat ORP surface electrode
3-2717 Bulb ORP electrode with bulb protection (on plastic body electrodes only)

Options

- For electrodes used in in-line mounting with Signet fittings, use red or blue electrode
cap (see sensor caps for in-line mounting)

-WT Glass electrode with Twist-Lock connector; for use with the 3719 Wet-Tap Assembly
Only. Available for Part Numbers 3-2716 and 3-2717 only

3-2714 Example Part Number
3-2716 -WT Example Part Number

Sensor Caps for In-Line Mounting - Choose one (required for initial installation of any pH or ORP electrode)

P31542 Red Sensor Cap (commonly used for distinguishing pH from ORP sensors)
P31542-3 Blue Sensor Cap (commonly used for distinguishing ORP from pH sensors)

P31542 Example Part Numbers

Preamplifiers - Choose one (required for initial installation of any pH or ORP electrode)

3-2720 3/4 inch FNPT submersion threads; 4.6m (15 ft.) cable
3-2720-2 ISO 7/1-R3/4 inch FNPT submersion threads; 4.6m (15 ft.) cable
3-2714 and 3-2720 Example Part Numbers

Choosing

Products

Instrument

Multi-Pa-

rameter

Flow

pH/ORP

Conductivity/

Resistivity

Pressure, Level

Temperature,

Application Notes:

• Use the flat glass
electrodes when a
self-cleaning feature
is desired; especially
useful in applications
with abrasive particles.

• Use bulb protected
electrodes for general
purpose applications

• ORP electrodes are
generally used for
chemical reaction
monitoring, not pro­cess control.

• Ensure that sensor
materials are chemi­cally compatible with
the process liquid.

• Cleaning and calibra­tion of electrodes is
application dependent.

Please refer to
Installation,
Accessories and
Fittings sections for
more information.

Mfr. Part No. Code

3-2714 198 844 300

3-2714-HF 198 844 305
3-2715 198 844 301
3-2716 198 844 302
3-2716-DI 198 844 306
3-2716-WT 159 000 809

Mfr. Part No. Code

3-2717-WT 159 000 811
3-2720 198 864 602
3-2720-2 198 864 603
3-2721 198 864 610
P31542 198 801 630
P31542-3 159 000 464

3-2717 198 844 303

Accessories and Replacement Parts

Mfr. Part No. Code Description
Calibration Accessories

3-2759 159 000 762 pH/ORP System Tester (includes bypass
adapter)
3-0700.390 198 864 403 pH Buffer Kit

Mounting

P31515-0P200 159 000 630 PVC Pipe Adapter, 1.25 in. O.D.
P31515-0C200 159 000 631 CPVC Pipe Adapter, 1.25 in. O.D.
P31515-0V200 159 000 459 PVDF Pipe Adapter, 1.25 in. O.D.

Other

1220-0021 198 801 186 Replacement O-ring, FPM (for electrodes)
1224-0021 198 820 006 Replacement O-ring, EPDM (for electrodes)
1228-0021 198 820 007 Replacement O-ring, Kalrez® (for electrodes)
5523-0624 159 000 636 Cable, 24 AWG, 6-conductor
(specify length)
3-2721 198 864 610 Remote pH/ORP preamplifier
3-2759.393 159 000 765 Adapter cable for use with 2720
P31542 198 801 630 Sensor cap, red
P31542-3 159 000 464 Sensor cap, blue

Graphs

Products

Other

Installation

Wiring &

Reference

Technical

Temperature/

Pressure

of Terms

Glossary

Reference

Part No.

www.gfsignet.com

Index

87