Georg Fischer 2760 Operating Manual
Signet 2760 DryLoc® pH/ORP Preamplier
*3-2760.090*
3-2760.090 Rev. 9 01/18
Description
The Signet 2760 pH/ORP Preampliers with DryLoc® connectors are part of
Signet's growing line of sensors for industrial uid measurement and control.
There are two styles of preampliers, and each is available with NPT or ISO
threads at the cable outlet. They all connect to four different families of pH and
ORP electrodes to supply an amplied mV (analog) signal to Signet instruments.
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Table of Contents
Warranty Statement .............................................................................. 2
Product Registration ............................................................................. 2
Safety Information................................................................................. 2
Chemical Compatibility ......................................................................... 2
Specications........................................................................................ 2
Dimensions ........................................................................................... 3
In-Line Assembly and Installation ...................................................... 3-4
Wet-Tap Assembly and Installation ....................................................... 4
Submersible Sensor assembly and Installation .................................... 5
Wiring to Signet Instruments................................................................. 6
Wiring from DryLoc Preamplier to Others Equipment ......................... 7
Ordering Information ............................................................................. 8
Hand tighten only!
Chemical CompatibilityWarranty Information
Refer to your local Georg Fischer Sales ofce 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 ofce 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.
Under Service and Support click on
Product Registration Form
• If this is a pdf manual (digital copy), click here
Safety Information
1. Depressurize and vent system prior to installation or removal.
2. Conrm chemical compatibility before use.
3. Do not exceed maximum temperature/pressure specications.
4. Wear safety goggles or faceshield during installation/service.
5. Do not alter product construction.
6. When using chemicals or solvents care should be taken and
appropriate eye, face, hand, body, and/or respiratory protection
should be used.
WARNING
The retaining nuts of certain pH and ORP sensors and
preampliers 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
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.
Specications
General
Compatible Electrodes
Signet DryLoc Electrodes ..... 2724-2726, 2756-WTP- 2757-WTP,
2764-2767, 2774-2777
Compatible Instruments
Preamplier models to
Signet 5700, 8750 ............. 2760-1, -2, -11, -21
Response Time (includes response time of electrodes):
pH ..................................... < 6 sec. for 95% of change
ORP .................................. application dependent
Temperature, τ .................. 20 sec.
Electrical (2760-1, -2,-11, -21 Preampliers)
Maximum Offset ................... ± 7 mV
Input Impedance, Z............... > 1011 Ω
Supply Voltage (V+ to V–) .... 6 to 12 VDC
Current consumption ............ < 1 mA
Environmental
Enclosure Rating .................. 2760-1, -2, NEMA 6P/IP68
2760-11, -21, NEMA 4
with electrode and watertight
conduit and/or extension pipe
connected
Materials
Submersible versions........ CPVC (Gray)
In-Line versions................. PBT (Yellow)
Caution / Warning / Danger
Indicates a potential hazard. Failure to follow all warnings
may lead to equipment damage, injury, or death
Electrostatic Discharge (ESD) / Electrocution Danger
Alerts user to risk of potential damage to product by ESD,
and/or risk of potential of injury or death via electrocution.
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.
2
Signet 2760 DryLoc pH/ORP Preamplier
Cable .................................... 4.6 m (15 ft) 6-conductor
w/shield, 22 AWG
Maximum cable: ................... 122 m (400 ft)
Shipping Weight: .................. 0.64 kg (1.41 lb)
Operating Temperature ......... 0 °C to 85 °C (32 °F to 185 °F)
Storage Temperature ............ –20 °C to 85 °C (–4 °F to 185 °F)
Relative Humidity.................. 0 to 95%, non-condensing
(without electrode connected)
Standards and Approvals
Manufactured under ISO 9001 and ISO 14001
China RoHS (Go to www.gfsignet.com for details)
35.0 mm
(1.38 in.)
89.4 mm
(3.52 in.)
101 mm
(4.0 in.)
35.0 mm
(2.40 in.)
Dimensions
Lock
Lock
Unlock
100 mm
(4 in.)
3-2760-1 Preamplier, Sub, NPT
3-2760-2 Preamplier, Sub, ISO
31.75 mm
(1.25 in.)
70.1 mm
(2.76 in.)
56.6 mm
(2.23 in.)
3-2760-11 Preamplier, In-line, NPT
3-2760-21 Preamplier, In-line, ISO
101 mm
(4.0 in.)
(1.38 in.)
61.0 mm
In-line Assembly and Installation
2760 In-Line models used with 2724-2726 series electrodes:
1. The 2724-2726 can use a Signet installation tting. Electrodes are sealed by the O-ring when it is installed into a Signet
installation tting.
2. The lower threaded nut is required to attach the electrode to the
installation tting when using a Signet tting.
HAND-TIGHTEN THE THREADED NUT ONTO THE
INSTALLATION FITTING. DO NOT USE TOOLS!
DO NOT USE THREAD SEALANT OR LUBRICANTS
ON THE FITTING THREADS OR THE SENSOR CAP.
Lubricate O-rings
3
Unlock
100 mm
(4 in.)
3. Lubricate O-rings with a non-petroleum based, viscous lubricant
(grease) compatible with the system.
1
2
4 5
4. Seat the 2760 DryLoc connector onto the top of the electrode.
Open the DryLoc connector by turning the upper locking ring ¼-turn clockwise.
5. Turn the locking ring ¼-turn counter-clockwise to lock the preamplier in place. The mechanism will “click” when it is locked.
When fully assembled the 2760 will stand about 100 mm (4 in.) above the installation tting.
2760 In-Line models used with 2764-2767 or 2774-2777 series electrodes:
BEFORE YOU START:
2764-2767: Install a 1 in. NPT pipe tee into the process line.
Lubricate O-rings
2
2774-2777: Install a ¾-in. reducing tee into the process line.
1. Wrap the process threads on the electrode with an
appropriate sealant (example: PTFE tape ) to create a
water-tight connection. HAND-TIGHTEN the electrode into
Unlock
178 mm
(7 in.)
the installation tting. DO NOT USE TOOLS!
NOTE: The lower threaded nut may be dropped onto the top
of the electrode or it may be discarded. It is not used with
these electrodes.
2. Lubricate O-rings with a non-petroleum based, viscous
lubricant (grease) compatible with the system.
1
3
3. Seat the 2760 DryLoc connector onto the top of the
electrode.
Open the DryLoc connector by turning the upper locking ring ¼-turn clockwise.
4. Turn the locking ring ¼-turn counter-clockwise to lock the preamplier in place. The mechanism will “click” when it is locked.
When the 2760 Preamplier is fully assembled with one of the threaded electrodes (276X and 277X models) it will stand
approximately 178mm (7 in.) from the process threads to the top of the preamplier.
Lock
4
Signet 2760 DryLoc pH/ORP Preamplier
3
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