GF Signet 3719 User Manual
Signet 3719 pH/ORP Wet-Tap
*3-3719.090*
3-3719.090 Rev L 12/11 English
English
• 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.
1. Description
2. Specifi cations
3. Dimensions
4. 3719 System Overview
5. Installation
6. Maintenance & Cleaning
7. Troubleshooting
8. Ordering Information
1. Description
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.
2. Specifi cations
General
• Compatible sensors:
2716-WT Twist-Lock pH Electrode
2717-WT Twist-Lock ORP Electrode
2756-WT DryLoc® pH Electrode
2756-WT-1 DryLoc® pH Electrode
2756 -WTP DryLoc® plastic pH electrode
2756-WTP-1 DryLoc® plastic pH electrode
2757-WT DryLoc® ORP Electrode
2757-WTP DryLoc® plastic ORP electrode
• 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: FPM
• Electrode Body: Glass OR Plastic
• Electrode junctions: Porous PTFE
• Electrode sensing surface:
Glass Membrane (pH)
Platinum (ORP)
• Electrode O-rings: FPM
Other Materials
• Locking Shroud: PVC
• Hardware: 316 stainless steel
Performance
• Maximum Flow Velocity: 3 m/s (10 ft/s)
• Effi ciency: > 97% @ 25 °C (77 °F)
• Response Time: pH: <5s for 95% of signal change
ORP: Application dependent
• Drift: < 2 mV per week
• Operating Range: pH: 0 to 14 pH
ORP: –2000 to +2000 mV
• Reference Junctions: Porous PTFE
• Electrolyte: 3.5M KCl
• Elements: Ag/AgCl
• Temp. Sensor (pH): 3K Balco (3-2716-WT,
3-2756-WT-1, WTP-1)
PT1000 (3-2756-WT, -WTP)
• Temp. response time ( 438 s
• Sodium Ion Error: < 0.05 pH in 0.1 molar
Na+ ion at 12.8 pH
• Impedance (pH): <150 MΩ @ 25 °C
Storage Temperature:
• Wet-tap assembly: -15 to 120 °C (5 to 248 °F)
• Electrode: 0 to 50 °C (32 to 122 °F)
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.
Standards and Approvals
• Manufactured under ISO 9001 and 14001
25
China RoHS (Go to www.gfsignet.com for details)
76 mm
(3.0 in.)
130 mm
(5.13 in.)
49 mm
(1.94 in.)
45 mm
(1.75 in.)
39 mm
(1.52 in.)
20 mm
(0.8 in.)
75 mm
(2.94 in.)
Pipe thread
1
1
/2 in. NPT
or
ISO 7-R1
1
/
2
76 mm
(3.0 in.)
39 mm
(1.52 in.)
20 mm
(0.8 in.)
Pipe thread
2 in. NPT
or
ISO 7-R2
34 mm
(1.32 in.)
41 mm
(1.62 in.)
25 mm
(1.00 in.)
3. Dimensions
12 mm
(0.47 in.)
30,5 mm
(1.2 in.)
218 mm
(8.57 in.)
35 mm
(1.4 in.)
3719-1 Wet-tap
11/2 in. outlet for
21/2 to 4 in. pipe
3719-2 Wet-tap
2 in. outlet for
6 to 12 in. pipe
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.
2716-WT pH electrode
2717-WT ORP electrode
2756-WT(-1) pH electrode, glass
2756-WTP(-1) pH electrode, plastic
2757-WT ORP electrode, glass
2757-WTP ORP electrode, plastic
2 Signet 3719 pH/ORP Wet-Tap
4. 3719 System Overview
a
b
c
d
e
d
a) 3719 pH/ORP Wet-Tap
b) Customer-supplied Low-Profi le Clamp-on Saddle Fitting
(ASTM sizes 2½ to 12 in.)
c) DryLoc® pH or ORP Electrode (6 versions available; see
ordering infomation on page 8.)
("DryLoc®" refers to the electrode connector style)
d) 2750 or 2760 DryLoc® pH/ORP Preamplifi er/Sensor
electronics
e) Output signal options:
2750:
- Digital (S3L)
- 4 to 20 mA
2760:
- Analog mV Output- Digital (S3L)
All components (items a–d) are sold separately.
5. Installation
5.1 Notes on Location, Orientation and Required Clearance
• The 3719-1 is designed for use in pipes up to 4 in.
• The 3719-2 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.
• 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
• Provide 20 inches (minimum) clearance from the top of the
pipe for electrode removal..
218 mm
(8.57 in.)
250 mm
(9.9 in.)
115 mm
(4.5 in.)
OR
89.4 mm
(3.5 in.)
45 mm
(1.75 in.)
3Signet 3719 pH/ORP Wet-Tap
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