Page 1
2-17/64[57.6]
3-3/8
[85.5]
3-45/64 [94]
2-9/16 [65]
1.743
2.272
[64]
1/2 NPT
SERIES 681
SANITARY PRESSURE TRANSMITTER
No Liquid Fill Diaphragm, Sanitary Clamp Fitting
CALIBRATION SERVICES AVAILABLE
Single Pressure Switches /
Single Pressure Transmitters
The Series 681 Sanitary Pressure Transmitter is designed to meet 3A standards
for applications in food, dairy, beverage and pharmaceutical processing, liquid level
control, and sanitary pipelines. The unit is fully sealed to withstand high pressure wash-
down in Clean-in-Place (CIP) and Sterilize-in-Place (SIP) installations. The Series 681
is designed with a unique, no liquid ll diaphragm and a sanitary clamp pressure tting
for easy installation with negligible clamping effect. A conduit tting, shielded cable
with vent tube and sealed screws for zero and span adjustment combine to make the
Series 681 completely watertight.
BENEFITS/FEATURES
• Fully sealed to withstand Clean-in-Place and Sterilize-in-Place installations
supports regulatory conditions for sanitary processes
• Sanitary clamp tting makes for easy installation
APPLICATIONS
• Sanitary process applications
• Food and beverage processing
• Water processing
• Dairy processing
• Pharmaceutical processing
MODEL CHART
Model Range Overpressure Sanitary Clamp Connection
681-02
681-12
681-42
681-52
681-62
DWYER INSTRUMENTS, LLC | dwyer-inst.com96
0 to 1 psi
0 to 2 psi
0 to 15 psi
0 to 30 psi
0 to 60 psi
50 psi
100 psi
150 psi
150 psi
180 psi
[44]
[58]
2.516
SPECIFICATIONS
Service: Compatible liquids and gases.
Wetted Parts: 316L SS.
Accuracy: ±.20% FS (includes non-linearity, hysteresis and non-repeatability).
Temperature Limits: -40 to 260°F (-40 to 125°C) 10 to 90% RH, non-condensing.
Pressure Limits: See table.
Compensated Temperature Range: 20 to 180°F (-7 to 80°C).
Thermal Effect: Zero and span shift: ±2.0% FS/100°F.
Power Requirements: 9-30 VDC.
Output Signal: 4-20 mA, 2-wire.
Zero and Span Adjustment: ±0.5 mA, non-interactive.
Response Time: ≤ 10 ms.
Loop Resistance: 800 Ω.
Electrical Connections: 1/2˝ conduit tting and strain relief with 15 ft (4.5 m)
cable.
Process Connection: 2˝ or 1-1/2˝ sanitary clamp tting male NPT.
Clamping Effect: Zero and span shift: ±0.15% FS for ranges up to 30 psi; ±0.25%
FS for ranges >30 psi.
Weight: 8 oz (227 g).
OPTIONS
2˝
2˝
2˝
2˝
2˝
Use order code: Description
NISTCAL-PT1 NIST traceable calibration certicate for pressure transmitters
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