Dwyer Instruments 681 Specifications

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

Single Pressure Switches

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 wash­down 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.

FEATURES/BENEFITS

• 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

DWYER INSTRUMENTS, INC. | www.dwyer-inst.com100

SPECIFICATIONS
Service: Compatible liquids and gases.

Wetted Parts: 316L SS.
Accuracy: ±.20% FS (includes

non-linearity, hysteresis and non­repeatability).
Temperature Limits: -40 to 260°F
(-40 to 125°C) 10 to 90% RH, non­condensing.

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 to 30 VDC.

MODEL CHART

Model Range Overpressure
681-02

681-12
681-42
681-52
681-62

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

Sanitary Clamp
Connection

2˝
2˝
2˝
2˝
2˝

[44]

[58]

2.516

Output Signal: 4 to 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).