GF Signet 2760 User Manual
Signet 2760 DryLoc® pH/ORP Preamplifi er
*3-2760.090*
3-2760.090 Rev. H 05/11 English
SAFETY INSTRUCTIONS
1. Depressurize and vent system prior to installation or removal.
2. Confi rm chemical compatibility before use.
3. Do not exceed maximum temperature/pressure specifi cations.
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.
English
Description
The Signet 2760 pH/ORP Preamplifi ers with DryLoc
®
connectors are part of Signet's growing line of sensors for industrial fl 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 amplifi ed mV (analog) signal to Signet instruments.
The 2760 family also offers a set of connectors to link the same electrodes to third-party equipment that require a direct millivolt signal for
pH measurement without amplifi cation.
Technical Data
General
Compatible Electrodes:
Signet DryLoc Electrodes: 2724-2726, 2756-WTx - 2757-WTx,
2764-2767, 2774-2777
Compatible Instruments:
Preamplifi er models to Signet 5700, 8750:
2760-1, -2, -11, -21
Connector models to non-Signet products:
2760-3, -4, -31, -41
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 Preamplifi ers)
• Maximum Offset: ± 7 mV
• Input Impedance, Z: > 10
11
Ω
• Supply Voltage (V+ to V–): 6 to 12 VDC
• Current consumption: < 1 mA
Environmental
• Enclosure Rating: 2760-1, -2, -3, -4: NEMA 6P/IP68
2760-11, -21, -31, -41: NEMA 4
with electrode and watertight
conduit and/or extension pipe
connected
Materials:
• Submersible versions: CPVC (Gray)
• In-Line versions: PBT (Yellow)
Dimensions
3-2760-1 Preamplifi er, Sub, NPT
3-2760-2 Preamplifi er, Sub, ISO
3-2760-3 Connector, Sub, NPT
3-2760-4 Connector, Sub, ISO
3-2760-11 Preamplifi er, In-line, NPT
3-2760-21 Preamplifi er, In-line, ISO
3-2760-31 Connector, In-line, NPT
3-2760-41 Connector, In-line, ISO
31.75 mm
(1.25 in.)
70.1 mm
(2.76 in.)
101 mm
(4.0 in.)
56.6 mm
(2.23 in.)
35.0 mm
(1.38 in.)
89.4 mm
(3.52 in.)
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)
61.0 mm
(2.40 in.)
CHEMICAL COMPATIBILITY WARNING
The retaining nuts of certain pH and ORP sensors and
preamplifi ers 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.
In-line Assembly and Installation
2760 In-Line models used with 2724-2726 series electrodes:
1. The 2724-2726 can use a Signet installation fi tting. Electrodes are sealed by the O-ring when it is installed into a Signet installation
fi tting.
2. The lower threaded nut is required to attach the electrode to the
installation fi tting when using a Signet fi tting.
Lubricate O-rings
3
HAND-TIGHTEN THE THREADED NUT ONTO THE
INSTALLATION FITTING. DO NOT USE TOOLS!
Unlock
100 mm
(4 in.)
DO NOT USE THREAD SEALANT OR LUBRICANTS ON
THE FITTING THREADS OR THE SENSOR CAP.
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 preamplifi er 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 fi tting.
2760 In-Line models used with 2724-2726, 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 and 2724-2726: 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
Unlock
178 mm
(7 in.)
connection. HAND-TIGHTEN the electrode into the installation
fi 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
1
3
(grease) compatible with the system.
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 preamplifi er in place. The mechanism will “click” when it is locked.
When the 2760 Preamplifi er is fully assembled with one of the threaded electrodes (276X and 277X models) it will stand
approximately 18 cm (7 in.) from the process threads to the top of the preamplifi er.
Lock
Lock
4
2760 Submersible models used as in-line system:
The Submersible 2760 design can also be used in-line when
2760 Preamplifier
using the 2724-2764, 2764-2767 series or the 2774-2777 series
electrodes.
178 mm
BEFORE YOU START:
2764-2767: Install a 1 in. NPT pipe tee in the process line.
2774-2777 and 2724-2726: Install a ¾-in. reducing tee in the
Threaded nut
1
7 in.
process line. DO NOT install in a ¾-inch tee or probe will be
damaged.
1. Wrap the process threads on the electrode with an
appropriate sealant (example: PTFE tape) to create a watertight connection.
Electrode
Lubricate O-ring
2
3
4
5 6
2. Lubricate O-rings with a non-petroleum based, viscous lubricant (grease) compatible with the system.
3. Remove the threaded nut from the preamplifi er and place it around the electrode from the bottom as illustrated.
4. HAND-TIGHTEN the electrode into the installation fi tting. DO NOT USE TOOLS!
5. Seat the 2760 DryLoc connector onto the top of the electrode.
6. Lift the threaded nut up and thread it hand-tight onto the preamplifi er.
When the 2760 Preamplifi er is fully assembled with one of the threaded electrodes (276X and 277X models) it will stand
approximately 18 cm (7 in.) from the process threads to the top of the preamplifi er.
• The 2760 Preamplifi er signal can be routed to a Signet 5700 ProPoint pH Monitor, or to any model of the 3-8750 pH Transmitter.
• If the preamplifi er cable must be extended beyond the standard 15 ft that is supplied with the 2760, use a junction box to terminate
the wires.
Note: Do not extend the 2760 cable more than 120 m (400 ft).
2
Signet 2760 DryLoc pH/ORP Preamplifi er
Wet-Tap Assembly and Installation
The 2760 DryLoc Preamplifi er can be used to connect Signet 3719 Wet-Tap electrodes to a pH or ORP instrument.
1. Select the process fi tting.
• Select a low profi le installation saddle (customer-supplied) with a 1½ in. or 2 in. outlet (depending on 3719 model ordered).
• The 3719 is available with NPT or ISO thread options.
• The 3719 can also be adapted to fi t into tee fi ttings. Refer to the 3719 pH Wet-Tap instructions for detailed information.
2. Install the Wet-Tap and the electrode.
• Install the 3719 into the fi tting, then insert the electrode into the assembly.
3. Attach the preamplifi er to the electrode.
• Attach the 3-2760-11 or -21 Preamplifi er to the DryLoc fi tting at the top of the electrode.
4. Connect the 2760 Preamplifi er to the instrument.
• The 2760 Preamplifi er signal can be routed to any 5700 or 8750 pH/ORP instrument (see Pg. 5).
1. 2. 3. 4.
Lubricate O-rings
Lubricate O-rings
RLA 1
2
3
Signet 2760 DryLoc pH/ORP Preamplifi er
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