Signet 3719 pH/ORP Wet-Tap
• Do not exceed maximum temperature/pressure specifications.
• 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
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.
1. Description
2. Specifications
3. Dimensions
4. 3719 System Overview
5. Installation
6. Maintenance & Cleaning
7. Troubleshooting
8. Ordering Information
*3-3719.090*
3-3719.090
Rev H 09/07 English
English
Process temperature and pressure specifications:
•
3719 Wet-tap and electrode installed with:
8 in. PP saddle:
Maximum 5 bar @ 20°C
(Maximum 72.5 psi @ 68°F)
6 in. PP saddle:
Maximum 6 bar @ 20°C
(Maximum 87 psi @ 68°F)
All other PP saddles:
Maximum 7 bar @ 20°C
(Maximum 102 psi @ 68°F)
The maximum pressure is derated by temperature up to
40°C. See graph below
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
Performance
•
Maximum Flow Velocity: 10 ft/s
•
Efficiency:
> 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
•
Accuracy:
± 0.1% over full range
•
Reference Junctions: Porous PTFE
•
Electrolyte:
3.5M KCl
•
Elements:
Ag/AgCl
•
Temp. Sensor (pH):
3K Balco (3-2716-WT)
PT-1000 (3-2756-WT, -WTP-X)
•
Temp. response time (
τ):
438 s
•
Sodium Ion Error:
< 0.05 pH in 0.1 molar
Na+ ion at 12.8 pH
•
Impedance (pH):
<150 M
Ω
@ 25°C
2. Specifications
Storage temperature:
•
Wet-tap assembly:
-15 to 120°C (5 to 248°F)
•
Electrode:
0° to 85°C (32° to 185°F)
°C
-10
0
°F
10
20
30
40°C
50
60
70
80
14.5
29
45
58
72.5
87
102
116
psi
2
1
3
5
7
32
14
50
68
4
6
8
bar
122
158 176
140
104°F
68
6 in. PP Saddle
2½, 3, 4, 10 & 12 in. PP Saddles
8 in. PP Saddle
Custom
fittings required
to operate in
this range!
Consult Factory
Wetted materials
•
Retraction Housing:
CPVC
•
O-rings:
FPM
•
Saddle Gasket:
FPM
•
Saddle body:
Polypropylene Grade 8
ASTM D2565, 1-8, UV stabilized
•
Electrode Body:
Glass OR Plastic
•
Electrode junctions:
Porous PTFE
•
Electrode sensing surface:
Glass Membrane (pH)
Platinum (ORP)
•
Electrode O-rings:
FPM
WARNING!
If used in conditions that exceed recommended
pressure ratings, this product can pose a serious
hazard.
We urge customers to read the specifications
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.
Other Materials
•
Locking Shroud:
PVC
•
Hardware:
316 SS
•
Saddle Hardware:
316 SS, 430 SS (reinforce. ring)
