Page 1
Signet 3719 pH/ORP Wet-Tap
*3-3719.090*
3-3719.090 Rev. 17 07/18
The Signet 3719 pH/ORP Wet-Tap allows installation and removal of pH or
ORP electrodes without the need for process shutdown during routine electrode
maintenance and calibration. Process isolation is achieved with a double O-ring
seal on a unique and compact retraction assembly; no separate valve is required.
A cam-activated automatic locking mechanism, SafeLoc™, and the short stroke
design help to assure operator safety.
English
Operating Instructions
Description
WARNING!
If used in conditions that exceed recommended
pressure ratings, this product can pose a serious
hazard.
We urge customers to read the specifi cations
carefully before installing and operating this product.
Improper use can cause components and process
liquids to be expelled at high speeds and cause
serious personal injury.
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Table of Contents
Warranty Information ......................................................... 2
Product Registration .......................................................... 2
Safety Information .............................................................2
Dimensions ........................................................................ 2
Specifi cations .................................................................... 3
System Overview............................................................... 3
Installation ......................................................................3-5
Location, Orientation and Required Clearance ............ 3-4
For pipe sizes 2.5 to 12 in. .......................................... 4
For pipe sizes less than 2.5 in. .................................... 4
Wet-Tap into Fitting...................................................... 5
Electrode Installation ................................................... 5
Electrode Removal ............................................................ 6
Electrode Maintenance ...................................................... 6
Troubleshooting ................................................................. 7
Replacing O-rings .............................................................. 8
Ordering Information........................................................ 12
Page 2
i
.
Warranty Information
Dimensions
Refer to your local Georg Fischer Sales offi 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 offi 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 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
3719-1 Wet-Tap
11/2 in. outlet for 21/2 to 4 in. pipe
76 mm
(3.0 in.)
49 mm
(1.94 in.)
25 mm
(1.00 in.)
39 mm
(1.52 in.)
Pipe thread
1
1
/2 in. NPT
or
ISO 7-R1
20 mm
(0.8 in.)
1
/
2
3719-2 Wet-Tap
2 in. outlet for 6 to 12 in. pipe
130 mm
(5.13 in.)
Pipe thread
2 in. NPT
or
ISO 7-R2
75 mm
(2.94 in.)
45 mm
(1.75 in.)
76 mm
(3.0 in.)
39 mm
(1.52 in.)
41 mm
20 mm
(0.8 in.)
34 mm
(1.32
(1.62 in
Safety Information
• Do not exceed maximum temperature/pressure
specifi cations.
• Wear safety goggles or face shield during
installation/service.
• Do not attempt to disassemble the retraction housing
and the electrode piston.
• Do not alter product construction.
• Failure to follow safety instructions may result in severe
personal injury.
• Retract electrode before any pipe cleaning operation.
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.
Note / Technical Notes
Highlights additional information or detailed procedure.
35 mm
(1.4 in.)
2756-WTP(-1) pH electrode, plastic
2757-WTP ORP electrode, plastic
218 mm
(8.57 in.)
CAUTION!
When using clamp-on saddle fi ttings (customer-supplied),
the system temperature and pressure is limited by the saddle
specifi cations.
The process temperature is limited to 40 °C (104 °F) maximum
when using saddles.
2 Signet 3719 pH/ORP Wet-Tap
Page 3
Specifi cations System Overview
General
Compatible sensors (See 3-2764.090 for more information):
2756 -WTP DryLoc plastic pH electrode
2756-WTP-1 DryLoc plastic pH electrode
2757-WTP DryLoc plastic ORP electrode
d
e
Shipping Weight
Wet-Tap assembly ............ 1.2 kg (2.7 lbs.)
Electrode ........................... 0.13 kg (0.3 lb)
Process Connection ............. 3-3719-11: 1½ in. NPT
3-3719-21: 2 in. NPT
3-3719-12: ISO 7/1-R1½
3-3719-22: ISO 7/1-R2
Wetted materials
Retraction Housing ............... CPVC
O-rings .................................. FKM
Other Materials
Locking Shroud..................... PVC
Hardware .............................. 316 stainless steel
Storage Temperature
Wet-Tap assembly ............ -15 to 120 °C (5 to 248 °F)
Standards and Approvals
Manufactured under ISO 9001 and 14001
25
China RoHS (Go to www.gfsignet.com for details)
c
a
b
a) 3719 pH/ORP Wet-Tap
b) Customer-supplied Low-Profi le Clamp-on Saddle Fitting
(ASTM sizes 2½ to 12 in.)
c) DryLoc
(DryLoc
d) 3-2751-1 or 2760 DryLoc
e) 3-2751-2 electronics
NOTE: Output signal options (See specifi c manual for details):
2751:
- Digital (S
- 4 to 20 mA
2760:
- Analog mV Output- Digital (S
®
ordering information on page 8.)
pH or ORP Electrode (6 versions available; see
®
refers to the electrode connector style)
®
pH/ORP Sensor Electronics/
Preamplifi er
3
L)
3
L)
All components (items a–d) are sold separately.
Installation
Notes on Location, Orientation and Required Clearance
• The 3719-1X is designed for use in pipes up to 4 in.
• The 3719-2X is designed for use in pipes from 6 to 12 in.
• Select a location that will provide suffi cient clearance to
remove and insert the electrode.
• The 3719 can be mounted in any orientation, including
horizontal and inverted. Avoid the 12 o'clock position. In the
presence of sediment, avoid the 6 o'clock position. See next
page for dimensional information.
• If inverted, use caution when
removing the sensor.
Residual fl uid may be
present in the retraction
housing. Keep electrode
connector clean and dry at
all times.
Any angle OK
3Signet 3719 pH/ORP Wet-Tap
Page 4
Installation continued Installation continued
• Provide 20 inches (minimum) clearance from the top of the
pipe for electrode removal..
218 mm
(8.57 in.)
115 mm
(4.5 in.)
250 mm
(9.9 in.)
OR
89.4 mm
(3.5 in.)
45 mm
(1.75 in.)
Installation in Pipe Sizes less than 2.5 Inches
• It is possible to install the 3719 into pipe sizes below
2.5 inches by creating a “fl ow cell” with standard piping
components.
• One simple solution, using a tee fi tting and reducer bushings,
is shown in the example below.
• Many similar confi gurations are conceivable in a wide
variety of materials, but be very careful to verify dimensional
compatibility.
• Select an appropriate installation orientation to avoid the
entrapment of air inside the fl ow cell.
• Contact your local Georg Fischer Sales and Support offi ce
for assistance.
3-3719-1X
pH/ORP Wet-Tap
1½ in.
Threads
2 in /d50 mm
Tee
(S x S x S)
Flush Style Reducer Bushing
(Spg x FT) 2 in. x 1½ in.
Flush Style Reducer
Bushings (Spg x S)
2 in./d50 x ½ in./12 mm
2 in./d50 x ¾ in./20 mm
2 in./d50 x 1 in./25 mm
2 in./d50 x 1¼ in./30 mm
2 in./d50 x 1½ in./40 mm
Installation in Pipe Sizes 2.5 to 12 Inches
• For reliable in-line measurements of pH and ORP, it is
imperative to position the electrode tip into the process
stream.
• Because of its compact “short stroke” design, the 3719
requires low-profi le fi ttings to ensure
proper positioning in pipe sizes
DN65 to DN300 (2.5 to 12 inches).
• It is strongly recommended
to use low-profi le fi ttings
(customer-supplied).
• Choose the 3719 version (-1X or
-2X) appropriate to the size of the
branch connection of the required
fi tting:
Use -1X for sizes DN65 to DN100
(2.5 to 4 in), and -2X for sizes
DN150 to DN300 (6 to 12 in.)
3-3719-1X
pH/ORP Wet-Tap
(Fully Inserted)
4 Signet 3719 pH/ORP Wet-Tap
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Installation continued
Installation (Wet-Tap Into Fitting)
The 3719 is packaged with no electrode installed, and with the electrode piston in the fully inserted position.
• Examine the female threads at the top of the electrode piston. Do not install electrode if threads are damaged.
• Examine the two O-rings at the lower end of the assembly. Do not install if O-rings are missing or there are any signs
of damage.
• The internal O-rings (4 each) have been lubricated during assembly with Synthetic grease (PTFE).
• The pipe can be pressurized after completion of step 4.
• DO NOT ATTEMPT TO REMOVE THE RETRACTION HOUSING FROM A PRESSURIZED PIPING SYSTEM!
12
Grasp the retraction
housing below the
locking shroud; turn the
locking shroud 1/4-turn
clockwise.
Locking
Shroud
Retraction
Housing
Lubricated
O-rings
Pull the locking
shroud straight
up until both
O-rings are fully
seated inside
the retraction
housing.
The electrode piston is locked
in position by SS locking pins.
DO NOT tamper with the
locking pins!
If the piston is depressed with
no electrode installed, the pipe
contents are exposed.
34
Turn the
shroud 1/4-turn
counterclockwise
and lift it
completely away
from the electrode
piston.
Electrode
Piston
• Thread the Wet-Tap into the
pipe fi tting.
• Smaller pipes may require
bracing to support the Wet-Tap
weight and the longitudinal
forces required for operation.
• Use an appropriate thread
sealant to prevent leaks.
• The piping system can now be
safely pressurized.
• Inspect the installation for leaks.
Electrode Installation
Before installation, lubricate O-rings with a nonpetroleum based, viscous lubricant (grease)
compatible with the system.
1. Remove the safety plug from top of electrode
piston. Slide electrode straight down into
electrode piston. Thread electrode into place
until connector shoulder is fl ush with top of
electrode piston. Hand tighten only.
WARNING:
Do not fl ex the electrode when inserting
into the Wet-Tap assembly. The electrode can
be permanently damaged if it is fl exed during
installation.
2. Place the Locking Shroud over electrode; turn
¼-turn clockwise to unlock the piston, then press
down fi rmly on the locking shroud to lower the
electrode piston into the pipe.
3. Turn the shroud 1/4-turn counterclockwise to lock
the piston.
4. Install the matching electronics assembly or
preamplifi er onto the electrode connector.
Lubricate O-Ring
1
DO NOT ATTEMPT TO
REMOVE THE RETRACTION
HOUSING FROM A
PRESSURIZED PIPING
SYSTEM!
Lubricate O-Ring
2751 2760 or 2751
2
OR
3
4
5Signet 3719 pH/ORP Wet-Tap
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Electrode Removal
The electrode in any pH or ORP system
requires periodic service, calibration or
replacement. When removing the electrode
from the Wet-Tap assembly, it is very important
to exercise caution and follow the instructions
carefully.
1. Remove the preamplifi er from the top of
the Wet-Tap assembly.
2. Turn the locking shroud
to unlock the piston.
3. Pull up on the locking shroud to retract the
electrode piston into the pipe.
1
/4-turn clockwise
1
DANGER!
The piston should retract easily from a pressurized pipe.
If the piston offers resistance, there is a danger that the
piston is coated with deposits from the process.
STOP! DO NOT FORCE THE PISTON UP!
It may damage the O-rings or break off the piston tip.
Return the locking shroud to the LOCKED position and follow the
steps in the box below.
2
3 4
3
5
5
4. Turn the locking shroud ¼-turn
counterclockwise and lift up to remove it from the Wet-Tap
assembly.
5. Remove the electrode by turning it counterclockwise.
For safety, keep your body clear of the top of the Wet-Tap
assembly while removing the electrode.
If the piston does not retract easily, or if any fl uid is observed leaking from the electrode
threads, the pipe must be drained before the 3719 can be safely removed.
• Stop the fl ow and depressurize the pipe.
• Remove the entire 3719 assembly from the pipe.
• Remove the electrode from the assembly
• Clean any scaling and debris found on or in the piston tip and surrounding area.
DANGER!
If any fl uid is observed leaking from the electrode
threads, STOP! DO NOT REMOVE THE ELECTRODE.
There is a danger that the piston tip has been damaged.
Tighten the electrode back down to reseal the assembly
and follow the steps in the box below.
6 Signet 3719 pH/ORP Wet-Tap
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Replacing O-rings
Tools required:
• Table vise
• Side cutter to cut O-rings
• 1 3/8" wrench
• Small screwdriver
• 3/16 Allen wrench
• Scissors
• Replacement O-ring kit for 3719
Wet-Tap (3-3719.392 code 159 310 304)
Lubricant
Remove shroud
1
Remove nose piece
4
Press and hold release pin, push
2
down to extend Wet-Tap piston
Release pin
Remove old O-rings (use the screwdriver to
5
carefully lift o-ring from groove and cut with scissors).
Inspect O-ring grooves for any damage or nicks
that may compromise the integrity of the liquid seal.
Clean the Wet-Tap piston and nose piece.
NOTE: Clean with a soft brush and a
chemical compatible solvent to
remove any debris
Carefully remove the Stainless Steel
3
set screw
Open the lubrication pouch and lightly
6
lubricate the new O-rings. Carefully roll
O-rings over the tip of the piston and
into each O-ring groove.
Lubricant
Locate the countersink hole on the
7
nosepiece. Verify that it is clean and
free of debris. Locate the threaded hole
on the main body. Verify that threads
are free of debris and are not damaged.
If threads are damaged, the Wet-Tap should
be replaced.
Assemble the nose piece back onto the
Wet-Tap main body.
Stainless Steel set screw hole
countersink hole
Replace the Stainless Steel set screw. Do not over
8
tighten. When properly installed, the set
screw should be flush with the Wet-Tap body.
watch a video of these instructions.
Click here
Replace the shroud.
9
The Wet-Tap is ready for reinstallation.
7Signet 3719 pH/ORP Wet-Tap
Page 8
Ordering Information
Mfr. Part No. Code Description
3-3719-11 159 000 804 pH/ORP Wet-Tap, 1
3-3719-21 159 000 805 pH/ORP Wet-Tap, 2 in. NPT
3-3719-12 159 000 806 pH/ORP Wet-Tap, ISO 7/1-R 1.5
3-3719-22 159 000 807 Wet-Tap Assembly, ISO 7/1-R 2
Parts and Accessories
3-2756-WTP 159 001 390 Electrode, pH, DryLoc
3-2756-WTP-1 159 001 384 Electrode, pH, DryLoc®, plastic bulb, 3 KΩ, Wet-Tap
3-2757-WTP 159 001 391 Electrode, ORP, DryLoc
3-2751-1 159 001 804 DryLoc pH/ORP Sensor Electronics, In-line
3-2751-2 159 001 805 DryLoc pH/ORP Sensor Electronics, In-line with EasyCal
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 threads and 4.6 m (15 ft) cable
3-3719.390 159 000 855 3719 Locking Shroud
3-3719.392 159 310 304 O-ring kit
1
/2 in. NPT
®
, plastic bulb, Pt1000, Wet-Tap
®
, plastic bulb, 10 KΩ ID, Wet-Tap
3-3719.390
Locking shroud
3-2756-WTP DryLoc pH electrode
3-2756-WTP-1 DryLoc pH electrode
3-2757-WTP DryLoc ORP electrode
3-3719.392
O-ring Kit
Georg Fischer Signet LLC, 3401 Aerojet Avenue, El Monte, CA 91731-2882 U.S.A. • Tel. (626) 571-2770 • Fax (626) 573-2057
For Worldwide Sales and Service, visit our website: www.gfsignet.com • Or call (in the U.S.): (800) 854-4090
For the most up-to-date information, please refer to our website at www.gfsignet.com
3-3719.090 Rev. 17 07/18 English © Georg Fischer Signet LLC 2018
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