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



RLA 1

2

3

Signet 2760 DryLoc pH/ORP Preamplifi er

2760 Submersible Sensor Assembly and Installation

55 mm/

2.16 in.

55 mm/

2.16 in.

Fill with
75-100 mm
(3 to 4 in.)
of sealant

The submersible 2760 can be installed in a tank or vessel if conditions are within pressure and temperature specifi cations.
The 2760 is able to withstand fl uid temperatures up to 85 °C, but the electrode tolerances vary. Check the specifi cations of each
component before installation.

1. Insert any DryLoc electrode into base of the 2760. Lubricate O-rings with a non-petroleum based, viscous lubricant (grease)

compatible with the system.

2. Thread retaining cap over electrode and hand-tighten onto 2760.

• Keep the DryLoc electrical interconnection between electrode and preamplifi er dry and clean at all times.

3. Attach

3

/4 in. watertight pipe to the top of the 2760. Secure the threaded connection to prevent any leakage.

• Fill the lower 75-100 mm (3 to 4 in.) of conduit or extension pipe with a fl exible sealant such as silicone
to prevent liquid accumulation on the back seal of the 2760.

3

1

2

Use standard installation hardware to
connect the submersible 2760 directly to
external equipment.

Lubricate O-ring

The 8052-1 NPT Mount Junction box
connects to 3/4 in. pipe or conduit and
provides convenient wiring termination.

The 8050-1 Universal Mount
junction box mounts fl at onto a wall

OROR

or can be strapped to a post or pipe.

Signet 2760 DryLoc pH/ORP Preamplifi er

Fill with
3 to 4 in.
of sealant

Fill with
3 to 4 in.
of sealant

½ in. NPT threads

Fill with
3 to 4 in.
of sealant

4

Standard output,
¾ in. process connector.

3-2774
3-2775
3-2776
3-2777

Differential output,
1 in. process connector.

3-2764-1
3-2765-1
3-2766-1
3-2767-1

Standard output,
Signet installation fittings

3-2724-10, -11
3-2725-60, -61
3-2726-10, -11
3-2726-HF-10, -11
3-2726-LC-10, -11
3-2756-WT-1
3-2756-WTP-1
3-2757-WT
3-2757-WTP

3-2760-1
3-2760-2

3-2760-1
3-2760-2

3-2760-11
3-2760-21

3-5700 pH/ORP Monitor

V +

Red Wire

V -

Black wire

-

+

T -

White wire

T +

Green wire

Iso. Gnd

Blue wire

Blue Iso. Gnd

mV Input

Brown wire

Brown mV

4-20

mA

Red V+

Black V-

White T-

Green T+

Connect this terminal to Earth GND to reduce electrical interference.

White (Temp)

Green (Temp)

Blue (Iso. Gnd)

Brown (mV input)

Shield

Black (V-)

Red (V+)

12
11
10

9
8
7
6
5

18
17
16
15
14
13
12
11

16
15
14
13
12
11
10

9

3-8750-13-8750-23-8750-3

ProcessPro pH/ORP Transmitter

3-2760-11
3-2760-21

Wiring to Signet Instruments

Any of these electrodes can be connected to the Signet ProPoint and ProcessPro pH instruments using the 3-2760-1(X) or -2(X)
Preamplifi ers.

Wiring diagrams illustrate the actual terminals on these products for convenience.

Signet 8750-X
ProcessPro pH/ORP Transmitter



RLA 1

2

Signet 5700
ProPoint pH/ORP Monitor

5

Signet 2760 DryLoc pH/ORP Preamplifi er

Wiring from 2760 DryLoc Preamplifi er to Other Manufacturer's Equipment

DryLoc Preamplifier, Submersible
3-2760-1
3-2760-2

DryLoc Preamplifier, In-Line
3-2760-11
3-2760-21

White (Temperature)

Green (Temperature)

Blue (mV Reference)

Shield (Earth Ground)

Black (V-)

Red (V+)

Brown (Active mV, pH/ORP)

The 2760-1/-2 Preamplifi er and electrode options may be used with third party equipment if the equipment can process the AMPLIFIED
mV signal for pH and is compatible with one of the temperature compensation options. (3 K, PT1000, or 300 ).

Refer to the manufacturer's manual for wiring details. Other products may use different terms to identify the function of each conductor.

Signet Combination pH Electrodes

3-2724-10 (3 KΩ, NPT)
3-2724-11 (3 KΩ, ISO)

3-2726-10 (3 KΩ, NPT)
3-2726-11 (3 KΩ, ISO)
3-2726-HF-10 (HF Resist, 3 KΩ, NPT)
3-2726-HF-11 (HF Resist, 3 KΩ, ISO)
3-2726-LC-10 (Low Cond, 3 KΩ, NPT)
3-2726-LC-11 (Low Cond, 3 KΩ, ISO)

3-2774 (3 KΩ TC)

3-2776 (3 KΩ TC)

Combination ORP (Redox) Electrodes

3-2725-60 (10 KΩ ID, NPT)
3-2725-61 (10 KΩ ID, ISO)

3-2757-WT (10 KΩ ID)

3-2775 (10 KΩ ID)
3-2775-1 (no Temp Comp)

3-2777 (10 KΩ ID)
3-2777-1 (no Temp Comp)

Differential pH Electrodes

3-2764-1 (3 KΩ RTD)
3-2764-3 (300 Ω RTD)

3-2766-1 (3 KΩ RTD)
3-2766-3 (300 Ω RTD)

Differential ORP (Redox)
Electrodes

3-2765-1 (10 KΩ ID)
3-2765-3 (300 Ω RTD)

3-2767-1 (10 KΩ ID)
3-2767-3 (300 Ω RTD)

Signet 2760 DryLoc pH/ORP Preamplifi er

6

Wiring from 2760 DryLoc Connectors to Other Manufacturer's Equipment

DryLoc Connector, Submersible
3-2760-3
3-2760-4

DryLoc Connector, In-Line
3-2760-31
3-2760-41

White RTD (Temperature)

Green RTD (Temperature)

Blue Solution Ground

Shield Earth Ground

Black Electrode Reference

Red (Active mV, pH/ORP)

Brown (no connection)

White RTD (Temperature)

Green RTD (Temperature)

Blue Solution Ground

Shield Earth Ground

Black Electrode Reference

Red (Active mV, pH/ORP)

Brown (no connection)

The 2760-3/4 Connectors can be used to interface other manufacturer's instruments to these Signet DryLoc pH and ORP electrodes.
The instrument must be able to process a UNAMPLIFIED mV signal from the pH or ORP electrode. Several different temperature devices
are available.

Refer to the manufacturer's manual for wiring details. Other products may use different terms to identify the function of each conductor.

Signet Combination pH Electrodes

3-2724-10 (3 KΩ, NPT)
3-2724-11 (3 KΩ, ISO)

3-2726-10 (3 KΩ, NPT)
3-2726-11 (3 KΩ, ISO)
3-2726-HF-10 (HF Resist, 3 KΩ, NPT)
3-2726-HF-11 (HF Resist, 3 KΩ, ISO)
3-2726-LC-10 (Low Cond, 3 KΩ, NPT)
3-2726-LC-11 (Low Cond, 3 KΩ, ISO)

3-2774 (3 KΩ TC)

3-2776 (3 KΩ TC)

Combination ORP (Redox) Electrodes

3-2725-60 (10 KΩ ID, NPT)
3-2725-61 (10 KΩ ID, ISO)

3-2757-WT (10 KΩ ID)

3-2775 (10 KΩ ID)
3-2775-1 (no Temp Comp)

3-2777 (10 KΩ ID)
3-2777-1 (no Temp Comp)

To any
instrument
with internal
amplifi er and
matching
temp device.

Signet 2760 DryLoc pH/ORP Preamplifi er

7

Ordering Information

Mfr. Part No. Code Description

3-2760-1 159 000 939 Submersible Preamplifi er with ¾ in. NPT threads and 4.6 m (15 ft) cable
3-2760-2 159 000 940 Submersible Preamplifi er with ¾ in. ISO 7/1R threads and 4.6 m (15 ft) cable
3-2760-3 159 000 941 Submersible Connector with 4.6 m (15 ft) cable and ¾ in. NPT threads
3-2760-4 159 000 942 Submersible Connector with 4.6 m (15 ft) cable and ISO 7/1R ¾ in. threads

3-2760-11 159 001 367 In-line Preamplifi er with ¾ in. NPT threads and 4.6 m (15 ft) cable
3-2760-21 159 001 368 In-line Preamplifi er with ¾ in. ISO 7/1R threads and 4.6 m (15 ft) cable
3-2760-31 159 001 369 In-line Connector with 4.6 m (15 ft) cable and ¾ in. NPT threads
3-2760-41 159 001 370 In-line Connector with 4.6 m (15 ft) cable and ISO 7/1R ¾ thread

Accessories and Replacement Parts

Calibration Tools
3-2759 159 000 762 pH/ORP System Tester (adapter cable sold separately)
3-2759.391 159 000 764 2759 Adapter Cable for use w/2760 DryLoc Preamplifi er
3-0700.390 198 864 403 pH Buffer Kit (1 each 4, 7, 10 pH buffer in powder form, makes 50 mL)
5523-0624 159 000 636 Cable, 6 conductor, 24 AWG shielded
3822-7004 159 001 581 pH 4.01 buffer solution, 1 pint (473 ml) bottle
3822-7007 159 001 582 pH 7.00 buffer solution, 1 pint (473 ml) bottle
3822-7010 159 001 583 pH 10.00 buffer solution, 1 pint (473 ml) bottle
3822-7115 159 001 606 20 gram bottle Quinhydrone for ORP calibration
3-2700.395 159 001 605 Calibration kit: included 3 Polypropylene cups, box as cup stand, 1 pint pH 4.01,
1 pint pH 7.00
Special Request NIST Traceable Certifi cate

Electrodes

DryLoc pH Electrodes
3-2724-10 159 001 547 Combo fl at pH Electrode, 3 KΩ RTD, ¾ in. NPT or Signet fi ttings
3-2724-11 159 001 548 Combo fl at pH Electrode, 3 KΩ RTD, ISO 7/1 R¾ or Signet fi ttings

3-2726-10 159 001 555 Combo bulb pH Electrode, 3 KΩ RTD, ¾ in. NPT or Signet fi ttings
3-2726-11 159 001 556 Combo bulb pH Electrode, 3 KΩ RTD, ISO 7/1 R¾ or Signet fi ttings
3-2726-HF-10 159 001 551 Combo bulb pH Electrode, 3 KΩ RTD, HF resistant, ¾ in. NPT or Signet fi ttings
3-2726-HF-11 159 001 552 Combo bulb pH Electrode, 3 KΩ RTD, HF resistant, ISO 7/1 R¾ or Signet fi ttings
3-2726-LC-10 159 001 559 Combo bulb pH Electrode, 3 KΩ RTD, Low conductivity, ¾ in. NPT or Signet fi ttings
3-2726-LC-11 159 001 560 Combo bulb pH Electrode, 3 KΩ RTD, Low conduct., ISO 7/1 R¾ or Signet fi ttings

3-2764-1 159 000 943 Differential pH Electrode, 3 KΩ RTD, 1 in. NPT process connection
3-2764-3 159 000 945 Differential pH Electrode, 300 Ω RTD, 1 in. NPT process connection
3-2766-1 159 000 949 Differential pH Electrode, 3 KΩ RTD, 1 in. NPT process connection
3-2766-3 159 000 951 Differential pH Electrode, 300 Ω RTD, 1 in. NPT process connection
3-2774 159 000 955 Combo fl at pH Electrode, 3 KΩ RTD, ¾ in. NPT process connection
3-2776 159 000 959 Combo fl at pH Electrode, 3 KΩ RTD, ¾ in. NPT process connection

DryLoc ORP (Redox) Electrodes
3-2725-60 159 001 561 Flat ORP Electrode, 10KΩ ID, ¾ in. NPT or Signet installation fi ttings
3-2725-61 159 001 562 Flat ORP Electrode, 10KΩ ID, ¾ in. ISO 7/1 R¾ or Signet installation fi ttings

3-2765-1 159 000 946 Differential ORP (Redox) Electrode, 10 KΩ ID, 1 in. NPT process connection
3-2765-3 159 000 948 Differential ORP (Redox) Electrode, 300 Ω RTD, 1 in. NPT process connection

3-2767-1 159 000 952 Differential ORP (Redox) Electrode, 10 KΩ ID, 1 in. NPT process connection
3-2767-3 159 000 954 Differential ORP (Redox) Electrode, 300 Ω TC, 1 in. NPT process connection

3-2775 159 000 957 Combo fl at ORP (Redox) Electrode, 10 KΩ ID, ¾ in. NPT process connection
3-2775-1 159 000 958 Combo fl at ORP (Redox) Electrode, no Temp, ¾ in. NPT process connection

3-2777 159 000 961 Combo bulb ORP (Redox) Electrode, 10 KΩ ID, ¾ in. NPT process connection
3-2777-1 159 000 962 Combo bulb ORP (Redox) Electrode, no Temp, ¾ in. NPT process connection

Georg Fischer Signet LLC, 3401 Aerojet Avenue, El Monte, CA 91731-2882 U.S.A. • Tel. [phone] • Fax [phone]
For Worldwide Sales and Service, visit our website: www.gfsignet.com • Or call (in the U.S.): [phone]
For the most up-to-date information, please refer to our website at www.gfsignet.com

3-2760.090 Rev. H 05/11 English © Georg Fischer Signet LLC 2011