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Signet 3719 pH/ORP Wet-Tap
*3-3719.090*
3-3719.090
•
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.
2. Specifications
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:
Electrode:
• Process Connection:
Performance
•
Maximum Flow Velocity: 10 ft/s
•
Efficiency:
•
Response Time:
•
Drift:
•
Operating Range:
•
Accuracy:
•
Reference Junctions: Porous PTFE
•
Electrolyte:
•
Elements:
•
Temp. Sensor (pH):
•
Temp. response time (τ): 4 38 s
•
Sodium Ion Error:
•
Impedance (pH):
Wetted materials
•
Retraction Housing:
•
O-rings:
•
Saddle Gasket:
•
Saddle body:
•
Electrode Body:
•
Electrode junctions:
•
Electrode sensing surface:
•
Electrode O-rings:
Rev H 09/07
English
1.2 kg (2.7 lbs.)
0.13 kg (0.3 lb)
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
> 97% @ 25°C (77°F)
pH: <5s for 95% of signal change
ORP: Application dependent
< 2 mV per week
pH: 0 to 14 pH
ORP: -2000 to +2000 mV
± 0.1% over full range
3.5M KCl
Ag/AgCl
3K Balco (3-2716-WT)
PT-1000 (3-2756-WT, -WTP-X)
< 0.05 pH in 0.1 molar
Na+ ion at 12.8 pH
<150 MΩ @ 25°C
CPVC
FPM
FPM
Polypropylene Grade 8
ASTM D2565, 1-8, UV stabilized
Glass OR Plastic
Porous PTFE
Glass Membrane (pH)
Platinum (ORP)
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.
Process temperature and pressure specifications:
•
3719 Wet-tap and electrode installed with:
8 in. PP saddle:
6 in. PP saddle:
All other PP saddles:
The maximum pressure is derated by temperature up to
40°C. See graph below
psi
bar
6 in. PP Saddle
116
8
102
7
87
6
72.5
5
58
4
3
45
8 in. PP Saddle
29
2
1
14.5
-10
0
10
14
32
50
Storage temperature:
•
Wet-tap assembly:
•
Electrode:
Other Materials
•
Locking Shroud:
•
Hardware:
•
Saddle Hardware:
1. Description
2. Specifications
6. Maintenance & Cleaning
Maximum 5 bar @ 20°C
(Maximum 72.5 psi @ 68°F)
Maximum 6 bar @ 20°C
(Maximum 87 psi @ 68°F)
Maximum 7 bar @ 20°C
(Maximum 102 psi @ 68°F)
2½, 3, 4, 10 & 12 in. PP Saddles
Custom
fittings required
to operate in
this range!
Consult Factory
20
30
40°C 50
60
70
68
68
104°F
122
140
158 176
-15 to 120°C (5 to 248°F)
0° to 85°C (32° to 185°F)
PVC
316 SS
316 SS, 430 SS (reinforce. ring)
English
80
°C
°F
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Table of Contents
Summary of Contents for Signet 3719
- Page 1 Signet 3719 pH/ORP Wet-Tap English *3-3719.090* 3-3719.090 Rev H 09/07 English 1. Description • Do not exceed maximum temperature/pressure specifications. 2. Specifications • Wear safety goggles or face shield during installation/service. 3. Dimensions • Do not attempt to disassemble the retraction housing and the 4. 3719 System Overview electrode piston. 5. Installation • Do not alter product construction. 6. Maintenance & Cleaning • Failure to follow safety instructions may result in severe 7. Troubleshooting personal injury. 8. Ordering Information • 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...
- Page 2 (0.8 in.) 39 mm 39 mm (1.52 in.) (1.52 in.) 2716-WT pH Electrode 2756-WT(-1) pH Electrode 2717-WT ORP Electrode 2756-WTP(-1) plastic pH Electrode 2757-WT ORP Electrode 3719-1 Wet-tap 3719-2 Wet-tap 2757-WTP plastic ORP Electrode in. outlet 2 in. outlet for for 2 to 4 in. 6 to 12 in. saddles saddles CAUTION! When using these clamp-on saddle fittings, the system temperature and pressure is limited by the saddle specifications.
- Page 3 4. 3719 System Overview 5. Installation 4.1 Twist-Lock Components 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 sufficient clearance to 10.20 pH remove and insert the electrode. 25.0C Signet pH/ORP • The 3719 can be mounted in any orientation, including Transmitter horizontal and inverted. ENTER • If inverted, use caution when removing the sensor. Residual fluid may be present in the retraction housing. Keep electrode connector clean and dry at all times. a) 3719 pH/ORP Wet-Tap Any angle OK b) Low Profile PP Clamp-on Saddle Fitting (ASTM sizes 2.5 to...
- Page 4 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-profile fittings to assure proper positioning in pipe sizes 2.5 to 12 inches. • Utilization of the accessory saddle fittings, offered as part of the 3719 system, is strongly recommended. • Choose the 3719 version (-11 or -21) appropriate to the size of the branch connection of the required fitting: Use -11 for sizes 2.5 to 4 in, and -21 for sizes 6 to 12 in. 5.3 Installation in Pipe Sizes less than 2.5 Inches • It is possible to install the 3719 into pipe sizes below •...
- Page 5 5.5 Electrode Installation 2750 1. Remove the safety plug from top of 2760 electrode piston. Slide electrode straight down into electrode piston. Thread electrode into place until connector shoulder is flush with top of electrode piston. Hand tighten only. 2. Place the Locking Shroud over electrode; 2720 turn ¼-turn clockwise to unlock the piston, then press down firmly on the locking shroud to lower the electrode piston into the pipe. 3. Turn the shroud -turn counterclockwise to lock the piston. 4. Install the matching electronics assembly or preamplifier onto the electrode connector. ENGLISH DO NOT ATTEMPT TO REMOVE THE RETRACTION HOUSING FROM A PRESSURIZED PIPING SYSTEM! Signet 3719 pH/ORP Wet-Tap...
- Page 6 Tighten the electrode back down to reseal the assembly and follow the steps in the box below. If the piston does not retract easily, or if any fluid is observed leaking from the electrode threads, the pipe must be drained before the 3719 can be safely removed. •...
- Page 7 0.24 0.18 0.12 0.06 0.06 0.12 0.18 0.24 0.45 0.36 0.27 0.18 0.09 0.09 0.18 0.27 0.36 0.45 Slope in ORP electrodes ORP slope errors are caused by contamination of the platinum electrode surface. Cleaning the electrode surface will usually restore proper values, response time, and stability. Many systems require both pH and ORP calibration. To conserve calibration reference solutions, use pH 7 and 4 buffers for pH calibration first. ORP calibration can be performed with the same buffers after adding quinhydrone. Response Time/Stability Response time and stability are affected by the condition of the glass surface (ORP electrode - Platinum surface), reference junction, and reference solution. Restoration to acceptable levels can often be accomplished by cleaning the electrode's glass surface (ORP electrode - Platinum surface) and reference junction. pH and ORP electrodes are similar to batteries; they age with time and usage. The following information will help maximize electrode life: • High temperatures or concentrated acids/caustics will accelerate electrode aging. • Never store the electrode tip in deionized (DI) water. • Never expose electrode to temperatures below -12°C (10°F) or allow it to dehydrate. These conditions will damage the electrode. Signet 3719 pH/ORP Wet-Tap...
- Page 8 1220-0114 O-rings 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 3-3719.090 Rev H 09/07 English © George Fischer Signet, Inc. 2002...
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