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Signet 2724-2726 pH/ORP Electrodes
General Purpose
Compatible with ALL Signet pH/ORP instruments
and SmartPro transmitters
Flat
Glass
The Signet 2724-2726 pH and ORP electrodes are general
purpose sensors ideal for a wide range of applications.
These feature a patented reference design and uses the
unique foul-proof patented DryLoc® connector. The large
area PE reference junction and pathway is constructed
to increase the total reference e ectiveness and ensures
long service life.
The DryLoc
plated contacts readily connects the sensor to the
mating 2751 pH/ORP Smart Sensor Electronics or
the 2760 Preamplifi er. The robust Ryton® threaded
sensor body and choice of fl at pH, bulb pH, or fl at ORP
sensing elements allows a broad range of chemical
and mechanical compatibility for a wide variety of
applications.
® connector with corrosion resistant gold
Protected
Bulb
Features
• Patented reference design for exceptional
performance and prolonged life in harsh
environments*
• Memory chip enabled for access to a wide
range of unique features when connected to the
Signet 2751 pH/ORP Smart Sensor Electronics
• Ryton® (PPS) body for broad range of chemical
compatibility
• Patented DryLoc® connector with gold plated
contacts
• Special design allows for installation at any
angle, even inverted or horizontal
• ¾” NPT or ISO 7/1-R 3/4 threaded sensors
for use with reducing tees DN15 to DN100
(½ to 4 in.)
• Mounts in Signet standard fi ttings from
DN15 to DN100 (½ to 4 in.)
• Quick temperature response
• Bulb and fl at HF resistant glass available
for trace HF, in less than 2% concentration
applications
• Low conductivity sensor available for liquids down
to 20 μS/cm
There are two optional pH sensing versions available, HF
and LC. The HF version is for applications where traces
of hydrofl uoric acid (2% or less) will attack standard pH
glass. The LC version can be used for low conductivity
fl uids 20 - 100 µS/cm nominal and below 20 µS when
mounted under controlled conditions.
The quick temperature response is available in either
a Pt1000 or 3 K temperature sensor and allows
compatibility with all Signet pH/ORP instruments. The
2724-2726 electrodes incorporate ¾ inch NPT or ISO
7/1-R 3/4 threads for installing into standard pipe-tees.
They can also be mounted directly into Signet standard
fi ttings, DN15 to DN100 (½ to 4 inch).
Applications
• Water & Wastewater Treatment
• Neutralization Systems
• E uent Monitoring
• Sanitization Systems
• Pool & Spa Control
• Aquatic Animal Life Support Systems
• Process Control
• Cooling Towers
*U.S. Patent Nos.: 6,666,701, 7,799,193 B2,
7,867,371 B2 and 8,211,282 B2
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Specifi cations
General
Performance E ciency >97% @ 25 °C (77 ° F)
Operating Range pH 0 to 14 pH
ORP ±2000 mV
3-2726-LC Low conductivity fl uids; 20 - 100 µS/cm nominal < 20 µS; fl ow must
be less than 150 ml/min in a properly grounded system
3-2724-HF, 3-2726-HF Hydrofl uoric acid resistant glass, pH 6 or below; trace HF <2%
Compatibility
2751 Smart Sensor Electronics (for 8900, 9900, 9950, 4 to 20 mA or Profi bus Concentrator),
2760 Preamplifi er
Temperature Sensor
Pt1000 versions Compatible with Signet 2751 pH/ORP Smart Sensor Electronics for
connection to a PLC or to the Signet 8900, 9900 or 9950 instruments
3 KΩ Balco versions Compatible with Signet 2751 pH/ORP Smart Sensor Electronics or with
Signet 2760 pH/ORP Preamplifi er for connection to the
Signet 8750 pH/ORP Transmitter
Process Connection
¾ in. NPT ISO 7/1-R 3/4 Mounts into Signet fi ttings
Wetted Materials
®
pH Ryton
ORP Ryton
Max. Temperature/Pressure Rating
Operating Temperature Range*
Operating Pressure Range 6.8 bar @ -10 to 65 °C (100 psi @ 14 to 150 °F)
*Best performance for 2724-HF, 2726-HF sensors is above 10
Recommended Storage Temperature
The electrode glass will shatter if shipped or stored at temperature below 0 °C (32 °F)
The performance life of the electrode will shorten if stored at temperatures above 50 °C (122 °F)
Mounting
In-line Mounting Use the sensor threads
Use a Signet standard fi tting up to 4 in.
Sensor can be mounted at any angle
Submersible Mounting Use threads on models 2751 or 2760
Requires ¾ inch NPT or ISO 7/1-R 3/4 male threaded liquid tight extension conduit.
Shipping Weight
0.25 kg 0.55 lb
Standards and Approvals
RoHS compliant, China RoHS
Manufactured under ISO 9001 for Quality, ISO 14001 for Environmental Management and
OHSAS 18001 for Occupational Health and Safety
(PPS), glass, UHMW PE, FKM
®
(PPS), glass, UHMW PE, FKM, Platinum
-10 °C to 85 °C 14 °F to 185 °F
4 bar @ 65 to 85 °C (58 psi @ 150 to 185 °F)
°C (50 °F)
0 °C to 50 °C 32 °F to 122 °F
See Temperature and Pressure graphs for more information
www.gfsignet.com
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Dimensions
*Yes
0.64 mm
(0.25 in.)
44.45 mm
(1.75 in.)
18.3 mm
(0.72 in.)
109 mm
(4.3 in.)
Threads:
¾ in. NPT
ISO 7/1 R-3/4
25.4 mm
(1.0 in.)
or
9.3 mm
(0.37 in.)
53.34 mm
(2.1 in.)
Yes
Yes
0°
Horizontal
Yes
Yes
*Yes
Mounting Angle
Models 2724-2726 may be mounted at any angle without
a ecting the performance.
*Avoid locations with air pockets and sediment.
When mounting in standard threaded fi ttings the electrode
must be mounted horizontally to 60 degrees below horizontal
position only.
Panel Mount 4 to 20 mA Output
Signet Instruments
8900 9900 or 9950
with 2751 Smart Sensor Electronics
ENTER
Signet 2724-2726
DryLoc® pH/ORP Electrodes
OR
Pipe, Tank, Wall Mount
Signet Instruments
9900 with 2751 Smart Sensor
Electronics and Rear Enclosure
+
NO NO
180°
240°
2751 Smart Sensor Electronics
and Customer Supplied Chart Recorder
or Programmable Logic Controller or
Programmable Automation Controller
+
PLC
90°
NO
0°
YESYES
NO
270°
300°
Automation System
2751 Smart Sensor Electronics with 0486 Profibus
Concentrator and Customer Supplied
Programmable Logic Controller or
Programmable Automation Controller
L IN+
L IN-
N/C
L OUT+
L OUT-
N/C
L IN+
L IN-
+5V OUT
DATA
GND
L IN+
L IN-
+5V OUT
DATA
GND
Out
In
S3L Loop
S3LLoop
USB
Profibus
Channel 5
Channel 6
Channel 7
+
Valve
Signet 3-0486 Profibus Concentrator
Address
Power
Channel 1
Channel 2
Channel 3
24 VDC
0.40A Max
S3LFreq
S3LFreq
S3LFreq
+5V OUT
+5V OUT
+5V OUT
Freq IN
Freq IN
Freq IN
PWR+
PWR+
PWR+
PWR-
PWR-
PWR-
DATA
DATA
DATA
GND
GND
GND
PLC
+
Channel 4
S3LFreq
+5V OUT
Freq IN
DATA
GND
System Overview
In-Line Installation Signet and threaded fittings only
Submersible Installation -
Customer supplied pipe extension
or conduit with 3/4 in. NPT or
ISO 7/1-R 3/4 threads
All sold separately
www.gfsignet.com
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Electrode Key Features and Benefi ts:
5
3
1. Ryton® body for chemical compatibility with most
harsh chemicals.
2. Porous UHMW PE (ultra high molecular weight
polyethylene) junction resists fouling and build-up.
3. Memory chip enabled for convenient data storage
and access (calibration data, operational data, and
manufacturing data), electrode health monitoring
via glass impedance measurement when used in
connection with the 2751 pH/ORP Smart Sensor
Electronics.
4. Internal temperature sensor located in the glass
stem for a quick temperature response.
5. DryLoc® connector with corrosion resistant gold
plated pins for quick and easy sensor removal.
Resists moisture and dirt intrusion.
6. Dual-patented reference design with a 406 mm
(16 in.) reference pathway for prolonged life in
harsh environments. This enables the sensor to last
signifi cantly longer than other standard pH/ORP
electrodes in most applications.
6a. With the patented reference design, the
Signet 2726-LC version performs better in low
conductivity water between 20 - 100 µS and lasts
longer than previous “DI” electrodes.
6b. The 2726-LC sensor also performs in
applications with extremely low (less than 20 µS)
conductivity. Special precautions must be taken to
avoid measurement complications.
Please note the following.
• Electrostatic charges (streaming potentials)
can cause dramatic o sets in a system with
very low conductivity water. To minimize this,
sensors should be placed in a well grounded
system.
• To enhance performance, a low fl ow cell is
recommended to provide a steady fl ow rate
(150 ml/minute). Sensors placed in high fl ow
applications will experience noisier readings
due to streaming potential.
7. Threads for NPT or ISO process connection into
reducing tees
• Use o -the-shelf GF reducing tees
DN20 to DN100 (¾ to 4 in.).
8. Mounts directly into Signet fi ttings (½ to 4 in.)
for easy sensor retrofi tting.
9. Mount submersed into a tank via the 2751 or
2760 back threads.
1
4
Dual-patented reference design
for long life in conductivity or
2
Sensor in threaded reducing tee
7
chemicals.
6
7
www.gfsignet.com
8
Sensor submersible installation
9
Sensor in Signet fi tting
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Temperature/Pressure Graph
Note:
The pressure/temperature graphs are specifically
for the Signet sensor. During system design the
specifications of all components must be considered.
In the case of a metal piping system, a plastic sensor
will reduce the system specification.
(psi)
150
125
100
75
50
25
(bar)
10.3
8.6
6.9
5.2
3.4
1.7
0
-40
°F°C-40
-20
-4
0
32 68
40
20
104
140
60 80 100
176
212
120
248
Application Tips
• Use the fl at glass electrodes when a self-cleaning
feature is desired; especially useful in applications
with abrasive chemicals for in-line installations.
• Use bulb protected electrodes for low temperature
applications or where fast response is required.
• ORP electrodes are generally used for chemical
reaction monitoring, not control.
• Ensure that sensor materials are chemically
compatible with the process liquid.
• Keep electrode tip wet, avoid air pockets and
sediment.
Bu er Solutions
3822-7004
3822-7007
3822-7010
Quinhydrone
3822-7115
Model 2724-2726 Ordering Notes
1) pH and ORP electrodes require connection to
model 2751 pH/ORP Smart Sensor Electronics or
2760 Preamplifi er.
2) The 2751 “EasyCal” feature recognizes common
pH and ORP bu er values of 4, 7 and 10 pH and
+87, +264 and +469 mV for ORP.
The Signet pH bu ers are ideal for calibration. The
liquid solutions are conveniently packaged in one pint
(473 ml) bottles. pH bu er kits in powder pillows are
available for mixing fresh solutions with water at the
time of use.
All pH bu ers are color coded for easy identifi cation;
4.01 pH is red, 7.00 pH is yellow, and 10.00 pH is blue.
All pH bu ers are traceable to NIST standards.
The 4.01 and 7.00 pH bu er solutions can be used
to calibrate ORP sensors when saturated with
quinhydrone.
www.gfsignet.com
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Ordering Information
Mfr. Part No. Code Tip Design Process Connection Thread Options
pH Electrodes
Temperature element Pt1000; use with 2751 pH/ORP Smart Sensor Electronics* and Profi bus Concentrator
3-2724-00 159 001 545 Flat ¾ in. MNPT, Thread
3-2724-01 159 001 546 Flat ISO 7/1-R 3/4 Thread
3-2726-00 159 001 553 Bulb ¾ in. MNPT, Thread
3-2726-01 159 001 554 Bulb ISO 7/1-R 3/4 Thread
3-2726-HF-00 159 001 549 Bulb, HF Resistant¹ ¾ in. MNPT, Thread
3-2726-HF-01 159 001 550 Bulb, HF Resistant¹ ISO 7/1-R 3/4 Thread
3-2726-LC-00 159 001 557 Bulb, Low Conductivity² ¾ in. MNPT, Thread
3-2726-LC-01 159 001 558 Bulb, Low Conductivity² ISO 7/1-R 3/4 Thread
Temperature element 3 K Balco; Compatible with both the 2751 pH/ORP Smart Sensor Electronics* and the
2760 Preamplifi er**
3-2724-10 159 001 547 Flat ¾ in. MNPT, Thread
3-2724-11 159 001 548 Flat ISO 7/1-R 3/4 Thread
3-2724-HF-10 159 001 771 Flat, HF Resistant¹ 3/4 in. NPT, Thread
3-2724-HF-11 159 001 772 Flat, pH Resistant¹ ISO 7/1-R 3/4 Thread
3-2726-10 159 001 555 Bulb ¾ in. MNPT, Thread
3-2726-11 159 001 556 Bulb ISO 7/1-R 3/4 Thread
3-2726-HF-10 159 001 551 Bulb HF Resistant
3-2726-HF-11 159 001 552 Bulb HF Resistant
3-2726-LC-10 159 001 559 Bulb, Low Conductivity
3-2726-LC-11 159 001 560 Bulb, Low Conductivity
ORP Electrodes; Compatible with both the 2751 pH/ORP Smart Sensor Electronics* and the 2760 Preamplifi er**
3-2725-60 159 001 561 Flat ¾ in. MNPT, Thread
3-2725-61 159 001 562 Flat ISO 7/1-R 3/4 Thread
1
1
¾ in. MNPT, Thread
ISO 7/1-R 3/4 Thread
2
¾ in. MNPT, Thread
2
ISO 7/1-R 3/4 Thread
*The 2751 pH/ORP Smart Sensor Electronics has a digital (S
3
L) output which is used with 8900, 9900 or 9950
instruments, and the Profi bus Concentrator.
It also has a 4 to 20 mA output for connections to PLC’s, data recorders, etc.
**The 2760 Preamplifi er is used for connection directly to 8750 transmitter or other analog transmitters.
1
HF resistant ‹2%HF
²Low conductivity applications, 20 - 100 µS/cm recommended
Note:
The 3 K Balco temperature element electrodes are compatible with the 2751
pH/ORP Smart Sensor Electronics, 8900, 9900 and 9950 instruments.
Accessories and Replacement Parts
Mfr. Part No. Code Description
1220-0021 198 801 000 O-ring, FKM (2 required per sensor)
3-2700.395 159 001 605 Calibration kit: includes 3 polypropylene cups, box used as cup stand,
1 pint pH 4.01, 1 pint pH 7.00
3822-7115 159 001 606 20 gm bottle quinhydrone for ORP calibration (must use pH 4.01 and/or
pH 7.00 bu er solutions)
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 Bu er Kit (1 each 4, 7, 10 pH bu er in powder form, makes 50 ml of each)
3822-7004 159 001 581 pH 4.01 bu er solution, 1 pint (473 ml) bottle
3822-7007 159 001 582 pH 7.00 bu er solution, 1 pint (473 ml) bottle
3822-7010 159 001 583 pH 10.00 bu er solution, 1 pint (473 ml) bottle
3800-5000 159 838 107 3.0M KCl storage solution for pH and ORP, 1 pint (473 ml) bottle
3-2700.397 159 001 870 Protective cap for pH/ORP electrodes, 5 pieces
3-2700.398 159 001 886 O-ring lubricant kit (5 packs of Super Lube, 1cc each)
3-2724.099 Rev J (06/19)
© Georg Fischer Signet LLC
3401 Aero Jet Avenue, El Monte, CA 91731-2882 U.S.A. • Tel. (626) 571-2770 • Fax (626) 573-2057 • www.gfsignet.com • e-mail: signet.ps@georgfi scher.com
Specifi cations subject to change without notice. All rights reserved. All corporate names and trademarks stated herein are the property of their respective companies.
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