Georg Fischer 3719 Operating Manual
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
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
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
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