Georg Fischer 3719 Specifications
Signet 3719 pH/ORP Wet-Tap Assembly
Features
• Electrode removal without process shutdown
• Space saving 45 mm (1.75 in.) short-stroke design
• Sealed pneumatic dampening for smooth and safe
operation
• SafeLoc™: Cam-activated automatic locking
mechanism
• Protects electrode sensing surface from breakage
• Suitable for mounting in any orientation
3719
Assembly
The Signet 3719 pH/ORP Wet-Tap allows installation and
removal of pH or ORP electrodes, even under process
pressure, without the need for process shutdown during
routine electrode maintenance and calibration.
Process isolation is achieved during electrode
retraction with two sets of double O-ring seals on a
unique and compact retraction assembly; no separate
valve is required.
The Wet -Tap body design allows full access to the
plunger and internal O-rings, to easily perform
maintenance such as lubrication/replacement of O-rings
and the cleaning of the internal plunger/housing to
remove material build up in di cult applications.
A patented cam-activated automatic locking mechanism,
SafeLoc™, and the short stroke design help to assure
operator safety. The wet-tap unit can be mounted at any
angle and can be used with the Signet DryLoc®
Wet-Tap electrodes.
2756, 2757 Wet-Tap
Electrodes
(Sold Separately)
• Process threaded connection NPT or ISO
• Fully serviceable internal O-rings
Applications
• Aquatic Animal Life Support Systems
• Recreational Water Monitoring
• Water & Wastewater Treatment
• E uent Monitoring
• Neutralization Systems
• Sanitization Systems
• Pool and Spa Control
NOTE:
This product is assembled using Synthetic grease
with PTFE.
Specifi cations
General
®
Compatible DryLoc
Process Connection 3719-11 NPT 1½
Maximum Flow Velocity 3 m/s 10 ft/s
Materials
Retraction Housing (Wetted) CPVC
O-rings (Wetted) FKM (O-Rings are lubricated with Super Lube multi-purpose grease with PTFE)
Locking Shroud PVC
Hardware 316 stainless steel
Max. Temperature/Pressure Rating
Operating Pressure 100 psi (6.9 bar) maximum @ 25 °C
Shipping Weight
Standards/Approvals
Electrodes 2756-WTP, 2756-WTP-1 plastic
2757-WTP plastic
3719-21 NPT 2 in.
3719-12 ISO 7/1 - R 1.5
3719-22 ISO 7/1 - R 2
1.2 kg 2.7 lb
Manufactured under ISO 9001 for Quality, ISO 14001 for Environmental Management and
OHSAS 18001 for Occupational Health and Safety
in.
See Temperature and Pressure graphs for more information
Wet-Tap Installation
Pipe, Tank, Wall Mount
Signet Instrument
8900 9900 9950
with 2751 Sensor Electronics
ENTER
Signet Model 3719 Wet-Tap Assembly
with Wet-Tap Electrode 3-2756-WTP
or 3-2757-WTP
OR
Signet Instruments
9900 with 2751 Electronics
and Rear Enclosure
+
+
System Overview
Customer supplied tees and fittings
4 to 20 mA InputPanel Mount
2751 Sensor Electronics
and Customer Supplied Chart Recorder,
Programmable Logic Controller, or
Programmable Automation Controller
+
PLC
Automation System
2751 Sensor Electronics with 0486 Profibus
Concentrator and Customer Supplied
Programmable Logic Controller or
Programmable Automation Controller
L IN+
L IN-
N/C
L OUT+
L OUT-
N/C
L IN+
L IN-
+5V OUT
DATA
GND
L IN+
L IN-
+5V OUT
DATA
GND
Out
In
S3L Loop
S3L Loop
USB
Profibus
Channel 5
Channel 6
Channel 7
+
Valve
Signet 3-0486 Profibus Concentrator
Address
Power
Channel 1
Channel 2
Channel 3
24 VDC
0.40A Max
S3LFreq
S3LFreq
S3LFreq
+5V OUT
+5V OUT
+5V OUT
Freq IN
Freq IN
PWR+
PWR+
PWR+
PWR-
PWR-
PWR-
DATA
DATA
GND
GND
PLC
+
Channel 4
S3LFreq
+5V OUT
Freq IN
Freq IN
DATA
DATA
GND
GND
All sold separately
www.gfsignet.com
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