Georg Fischer Signet 274X, 275X, 277X Operating Instructions
Signet 274X Series Diff erential DryLoc® pH and ORP Electrodes
Signet 275X Series Wet-Tap DryLoc® pH and ORP Electrodes
Signet 277X Series Threaded DryLoc
®
pH and ORP Electrodes
*3-2744.090*
3-2744.090 Rev 1 02/20
Operating Instructions
Description
The Signet General Purpose 275X Wet-Tap and High Performance 274X and 277X series
of pH and ORP electrodes are designed to minimize maintenance time and maximize
performance longevity and value. All three family of pH and ORP electrodes are memory
chip enabled to store Manufacturing, Calibration and Operational Data. For more fl exibility
274X
275X
and unique features, pair any pH or ORP electrode with a 2751 Smart Sensor Electronics
and the 9900 Transmitter, 9950 Dual Channel Transmitter or the 0486
Profi bus Concentrator.
The 275X Wet-Tap electrodes are all-purpose sensors ideal for applications where the probe
can be removed for cleaning and maintenance without the system shutdown. They feature a
unique foul-proof DryLoc
with the Signet 2751 Smart Sensor Electronics, and 2760 Preamplifi er. These dependable
and highly responsive electrodes feature a large reference chamber and intelligent
positioning of internal elements that combine to extend the service life. The electrodes
are o ered with a bulb sensing element that can be used for general purpose applications
where a fast response is required even at low temperatures. The choice of a Pt1000 or
3 K temperature sensor allows compatibility into all Signet pH/ORP instruments. The 3719
Wet-Tap assembly allows installation and removal of electrode even under process pressure
without the need for process shutdown.
®
connector with gold-plated contacts, designed specifi cally for use
English
277X
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California Prop. 65
WARNING:
Cancer and Reproductive Harm
www.p65warnings.ca.gov
The Signet 274X Series Di erential pH and ORP electrodes feature a Ryton® body and
PTFE reference junction to resist fouling, clogging and chemical attack under harsh
chemical applications. The glass in the pH di erential electrodes is special formulation for
high performance in media with high pH, elevated temperatures or high concentration of
suspended solids. The Di erential electrodes use a 3-electrode technique, measuring the
pH and reference electrodes against a ground electrode for a more stable output signal. The
solution ground eliminates noisy measurements by draining electrical current away from the
reference electrode. The reference electrode is housed in a glass half-cell embedded in the
reference chamber to protect it from poisioning or contamination. The electrolyte chamber is
refi llable and the salt bridge is fi eld replaceable.
The Signet 277X Series pH and ORP electrodes are highly responsive electrodes featuring
a PTFE double reference junction, potassium nitrate, KNO3, in the front chamber (to block
various poisoning ions such as copper (Cu2+), lead (Pb2+), mercury (Hg2+)) and a large
reference chamber. The two chambers combine to extend the service-life of the electrode.
Both the 274X Series and the 277X Series feature a unique foul-proof DryLoc® connector
with gold-plated contacts designed specifi cally for use with the Signet 2751 Smart Sensor
Electronics and 2760 Preamplifi er. They are available with either fl at or bulb style sensing
elements. The bulb protected style electrodes can be used for low temperature or low
conductivity applications or where a fast response time is required. The fl at versions
allow sediment and particles to sweep past the measurement surface, minimizing risks of
abrasion, breakage and coating. The temperature device in the pH electrodes is positioned
at the tip of the measurement surface, resulting in a temperature response of less than 1
minute. Temperature devices available include 3 K, or Pt1000 RTD.
Warranty Information
218 mm
(8.57 in.)
35 mm
(1.4 in.)
11.9 mm
(0.47 in.)
Chemical Compatibility
Refer to your local Georg Fischer Sales o 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 o 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 bu ers, 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.
Under Service and Support click on
Product Registration Form
• If this is a pdf manual (digital copy),
click here
Safety Information
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
2756 Wet-Tap pH
2757 Wet-Tap ORP
Electrode
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 freezable liquids.
Freezing damage to pH, ORP, and Chlorine electrodes voids product
DO NOT
warranty.
FREEZE
Lubricate O-rings with a
non-petroleum based,
viscous lubricant (grease)
compatible with the
system.
274X Series
Differential
Electrode
1 in.
NPT
45 mm
(1.8 in.)
277X Series
Bulb Electrode
¾ in.
NPT
43 mm
(1.7 in.)
277X Series
Flat Electrode
¾ in.
NPT
32 mm
(1.3 in.)
121 mm
(5.27 in.)
2
Signet 275X, 274X, 2777X Series pH and ORP Electrodes
Specifi cations
274X Series Diff erential Electrodes
277X Series Threaded Electrodes
General
Compatibility ......................... Signet 2751 and 2760
Shipping Weight ................... 0.25 kg (0.55 lbs.)
Operating Range
274X Series ......................... 0 to 14 pH, ± 1500 mV ORP
277X Series .......................... 0 to 14 pH, ± 2000 mV ORP
Reference Electrolyte
274X Series ......................... Bu ered KNO
277X Series ......................... KCI/AgCl gel with KNO
bridge
Reference Element
274X Series .......................... pH glass electrode
277X Series .......................... Ag/AgCl
Temperature Sensor
274X Series pH .................... 3 K or Pt1000 RTD
277X Series pH .................... 3 K or Pt1000 RTD
274X Series ORP ................. 10 K ID for Signet instruments;
277X Series ORP ................. 10 K ID for Signet instruments
3 solution
3 salt
bar
6.89
pH/ORP Electrodes
274X Series and 277X Series
psi
100
6
4
2
°F
Pressure vs. Temperature
80
60
40
20
0 40506070°C90 10080
32 122
274X Series
10 °C to 100 °C @ 6.89 bar
(50 °F to 212 °F @ 100 psi)
277X Series
0 °C to 85 °C @ 6.89 bar
(32 °F to 185 °F @ 100 psi)
10 20 30
274X Series ONLY
21217650 86
Wetted Materials
Body ..................................... Ryton
®
Reference junctions .............. PTFE
Sensing surface .................... Glass (pH), Platinum (ORP)
O-rings .................................. FKM and EPDM
Solution ground .................... Carbon graphite
(274X series only)
Operating Temperature
274X Series .......................... 10 °C to 100 °C (50 °F to 212 °F)
277X Series .......................... 0 °C to 85 °C (32 °F to 185 °F)
Storage Temperature ............ > 0 °C (32 °F)
Max Operating Pressure ..... 6.89 bar (100 psi)
275X Series Wet-Tap Electrodes
General
Compatibility ......................... Signet 2751 and 2760
Shipping Weight ................... 0.25 kg (0.55 lbs.)
Operating Range .................. 0 to 14 pH, ± 1500 mV ORP
Reference Electrolyte ........... Polymerized Acrylamide Gel
Wet-Tap electrolyte ............... 3.5 M KCl
Reference Element ............... Ag/AgCl
pH Temp Sensor ................... Pt1000 RTD or 3 K Balco
ORP Identifi cation ................. 10 K ID for Signet instruments
Wetted Materials
Wet-Tap body ....................... PAS (Poly Aryl Sulphone)
Wet-Tap Junctions ................ Porous PTFE
Sensing surface .................... Glass (pH), Platinum (ORP)
O-rings .................................. FKM
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.
Temperatures
Operating Temperature ......... 0 °C to 85 °C (32 °F to 185 °F)
Storage Temperature ............ 0 °C to 85 °C (32 °F to 185 °F)
Maximum Temperature and Pressure rating
6.89 bar @ 0 °C to 65 °C (100 psi @ 32 °F to 149 °F)
4.00 bar @ 65 °C to 85 °C (58 psi @ 150 °F to 185 °F)
Ryton® is a registered trademark of Chevron Phillips Chemical
Signet 275X, 274X, 2777X Series pH and ORP Electrodes
3
In-Line Installation
1. 2774 and 2775 electrodes can be mounted at any angle
2. Di erential (274X series) electrodes must be mounted at a
downward angle (> 15° from horizontal)
3. 275X Wet-Tap electrodes must be mounted in a 3719
Assembly at any angle
4. Avoid air pockets and sediments
5. Select a Signet installation fi tting (0.5” to 4” size range) for
convenience. Lightly lubricate o-ring with a non-petroleum
based lubricate (grease) compatible with the system.
6. Use the ¾ in. M-NPT or ISO 7/1-R ¾ threads on the electrode
body to install the electrode into reducing tee fi ttings.
7. Inspect threads to ensure integrity. Do not install an electrode
with damaged threads.
8. Apply PTFE tape to the M-NPT or ISO 7/1-R ¾ process
connection threads, in accordance with industry standards.
9. Use piping installation hardware with smooth,
well-fi nished threads to facilitate the installation.
10. If necessary, the pipe should be plumbed with a depression
(trap) so liquid is maintained around the electrode tip.
11. 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.
CAUTION:
A broken sensor may be ejected
forcefully from the fi tting and can cause
severe injury.
12. The safety instructions have an
adhesive label and should be placed
near the sensor.
NOTE:
When mounting in a standard threaded
fi tting, the electrode must be mounted
horizontal to 60 degrees below horizontal
position only:
0°
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!
WARNING
Attach near sensor
3-2700.615 (B-04/08)
YES
275X Wet-Tap
YES
275X Wet-Tap with 2751 or 2760 and
3719 pH/ORP Wet-Tap Assembly
1) Choose sensor; 2) Choose preamplifi er or sensor electronics;
3) Choose Wet-Tap assembly; 4) Choose customer supplied
mounting option
1
Wet-Tap pH or
ORP Sensor:
3-2756-WTP
3-2756-WTP-1
3-2757-WTP
2
2760
Preamplifier:
3-2760-11
3-2760-21
OR
2751 Smart Sensor
Electronics:
3-2751-1
3-2751-2
4
-15°
YES
YES
+15°
274X
NO
NO
277X
Signet 275X, 274X, 2777X Series pH and ORP Electrodes
NO
YES
YES
0°
Horizontal
YES
YES
YES
3
3719 Wet-Tap Assembly:
3-3719-11
3-3719-12
3-3719-21
3-3719-22
4
Customer supplied Tees and Fittings
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