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Signet 2756-2757 pH/ORP Wet-Tap Electrodes
Features
• PTFE reference junction resists fouling and
chemical attack
• Polyarylsulphone (PAS) body for broad range of
chemical compatibility
• General purpose bulb pH glass suitable in a wide
range of applications
• Patented DryLoc connector with gold plated
contacts
• Pt1000 or 3 KOhm Balco temperature element for
quick temperature response
• Electrode removal without process shutdown
when installed in the Signet 3719 pH/ORP Wet-Tap
Assembly
The Signet 2756-2757 Wet-Tap pH and ORP electrodes
are general purpose sensors ideal for a wide range of
applications where the installation and removal of the
electrode can be performed without the need for system
shutdown.
The Signet 3719 pH/ORP Wet-Tap Assembly allows
installation and removal of pH or ORP electrodes, even
under process pressure, without the need for process
shutdown during routine electrode maintenance and
calibration. Process isolation is achieved during
electrode retraction with two sets of double O-ring seals
on a unique and compact retraction assembly;
no separate valve is required.
The DryLoc connector with corrosion resistant gold
plated contacts readily connects the sensor to the
mating 2751 pH/ORP Smart Sensor Electronics or the
2760 Preamplifi er. The robust polyarylsulphone (PAS)
body and choice of bulb pH or fl at ORP sensing elements
allow a broad range of chemical compatibility for a wide
range of applications.
• Memory chip enabled for access to a wide range
of unique features when connected to the Signet
2751 pH/ORP Smart Sensor Electronics
• Special design allows for installation at any angle,
even inverted or horizontal
Applications
• Aquatic Animal Life Support Systems
• Recreational Water Monitoring
• Water & Wastewater Treatment
• E uent Monitoring
• Neutralization Systems
• Sanitization Systems
• Pool and Spa Control
The quick temperature response is available in either
a Pt1000 or 3 KΩ temperature sensor and allows
compatibility with all Signet pH/ORP instruments.
The Wet-Tap assembly unit can be mounted at any angle
and can be used with the Signet DryLoc® Wet-Tap pH and
ORP electrodes.
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Specifi cations
Customer supplied tees and fittings
All sold separately
4 to 20 mA InputPanel Mount
System Overview
Wet-Tap Installation
PLC
2751 Smart Sensor Electronics
and Customer Supplied Chart Recorder,
Programmable Logic Controller, or
Programmable Automation Controller
+
+
Signet Instrument
8900 9900 9950
with 2751 Smart Sensor Electronics
ENTER
OR
Pipe, Tank, Wall Mount
Signet Instruments
9900 with 2751 Smart Sensor
Electronics and Rear Enclosure
+
Automation System
2751 Smart Sensor Electronics with 0486
Profibus Concentrator
and Customer Supplied
Programmable Logic Controller or
Programmable Automation Controller
USB
Address
Signet 3-0486 Profibus Concentrator
S3L Freq
Channel 1
S3L Freq
Channel 2
S3L Freq
Channel 3
S3L Freq
Channel 4
S3L Loop
Channel 5
S3L Loop
Channel 6
Channel 7
Valve
In
Out
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
GND
DATA
Freq IN
+5V OUT
GND
DATA
Freq IN
+5V OUT
GND
DATA
Freq IN
+5V OUT
GND
DATA
Freq IN
+5V OUT
PWR-
PWR-
PWR-
PWR+
PWR+
PWR+
Profibus
Power
24 VDC
0.40A Max
PLC
+
+
Signet Model Wet-Tap Electrode 3-2756-WTP,
3-2756-WTP-1 or 3-2757-WTP
with 3719 Wet-Tap Assembly
General
Compatibility Signet 3719 Wet-Tap Assembly, 2751 Smart Sensor Electronics or 2760 Preamplifi er
Operating Range pH 0 to 14 pH
ORP ±1500 mV
Connector CPVC DryLoc
Temperature Sensor (pH) Pt1000 or 3K Balco for pH
Reference Junctions Porous PTFE
Electrolyte Saturated KCl
Elements Ag/AgCl
Response Time
pH < 5s for 95% of signal change
ORP Application dependent
Impedance (pH) < 150 MΩ @ 25 °C
Wetted Materials
Body PAS (Polyarylsulphone)
Reference Junction Porous PTFE
Sensing Surface pH Glass membrane
ORP Platinum
O-rings FKM
Connector CPVC
Max. Temperature Rating
Operating Temperature 0 °C to 85 °C 32 °F to 185 °F
Recommended Storage Temperature
0 °C to 50 °C 32 °F to 122 °F
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
Any angle is acceptable. Use with 3719 Wet-Tap assembly for mounting electrodes.
Shipping Weight
0.2 kg 0.4 lb
Standards and Approvals
Manufactured under ISO 9001 for Quality
www.gfsignet.com
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Dimensions
0
-40
-20
0 20
40
60 80 100
120
°F
°C
-40 -4 32 68 104
140
176
212
248
(bar)
(psi)
1.7
3.4
5.2
6.9
8.6
10.3
25
50
75
100
125
150
218 mm
(8.57 in.)
35 mm
(1.4 in.)
11.9 mm
(0.47 in.)
1
2
3
4
Customer supplied Tees and Fittings
Wet-Tap pH or
ORP Sensor:
3-2756-WTP
3-2756-WTP-1
3-2757-WTP
2760
Preamplifier:
3-2760-11
3-2760-21
OR
2751 Smart Sensor
Electronics:
3-2751-1
3-2751-2
3719 Wet-Tap Assembly:
3-3719-11
3-3719-12
3-3719-21
3-3719-22
Electrodes 3-2756 Wet-Tap pH,
3-2757 Wet-Tap ORP
O-ring
1220-0021
Product Selection Guide
Step 1 - Choose sensor
Step 2 - Choose preamplifi er or sensor electronics
Step 3 - Choose Wet-Tap assembly
Step 4 - Choose a customer supplied
mounting option
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.
www.gfsignet.com
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Ordering Information
Mfr. Part No. Code Tip design Temperature Element Use With
DryLoc pH Electrodes
3-2756-WTP 159 001 390 Bulb Pt1000 2751 Smart Sensor Electronics*
3-2756-WTP-1 159 001 384 Bulb 3 KΩ Balco 2751 or 2760 Preamplifi er**
DryLoc ORP Electrodes
3-2757-WTP 159 001 391 Flat N/A 2751 Smart Sensor Electronics*
*The 2751 Smart Sensor Electronics has a digital (S3L) output which is used with the 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 older Signet analog transmitters.
Model 2756-2757
Ordering Notes
1) pH and ORP electrodes require connection to model
2751-1 or 2751-2 or 2760-X1
or
2760 Preamplifi er**
Accessories and Replacement Parts
Mfr. Part No. Code Description
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)
Other
1220-0114 159 000 854 3719 O-ring, FKM (spare part)
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 bu er solution, 1 pint (473 ml) bottle
3822-7007 159 001 582 pH 7 bu er solution, 1 pint (473 ml) bottle
3822-7010 159 001 583 pH 10 bu er solution, 1 pint (473 ml) bottle
3-2759 159 000 762 pH/ORP system tester kit for all pH instruments
3-2759.391 159 000 764 Adapter cable for use with 2751 and 2760
3800-5000 159 838 107 3.0M KCl storage solution for pH and ORP, 1 pint (473ml) bottle
3-2756WT.099 Rev A (02/18)
© 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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