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Hydrostatic level transmitter 681
The pressure transmitters of Type 681 with piezoresistive measuring elements have compensated, calibrated, and amplified sensor signals, which are provided as standardized voltage or current outputs. In the version as a submersible probe with saltwater- and oil-resistant connection cable, they are particularly suitable for level measurement of aggressive liquids. For ambient pressure compensation, a tube is routed through the cable. All metal parts made of stainless steel are hermetically welded.
- Mechanically protected membrane through special head design
- 100 % sealed against medium, as fully welded
- Better stabilization of the sensor in turbulent media through additional weight (option)
- High overload safety due to chemically etched chip membrane and special design of the glass feedthrough
- Compact design in SMD technology increases operational safety during shock and vibrations
Hydrostatic level transmitter 681
Product feature
Pressure measuring range
0 ... 25 bar (Relative)
Pressure measuring range
optionally available (Absolute)
Field of application
Permissible overload
3x Pressure range
Bursting pressure
<200 bar
Media
Diesel oil; Heating oil; Kerosenes; Salt water; Brackish water; Drinking water, food-safe; Seawater; River water; Petrol; Chlorinated water
Medium temperature
-5 ... 80 °C
Material
Housing
Stainless steel 1.4435 (316L); Titanium
Sealing material
FPM
Cables
Teflon; PUR; PE
Electrical data
Supply voltage 3-wire
13 ... 30 VDC
Current consumption 3-wire
0 ... 10 V
Permissible load 3-wire
>10 kOhm
Supply voltage 2-wire
9 ... 33 VDC
Current consumption 2-wire
4 ... 20 mA
Permissible load 2-wire
< (supply voltage - 9V)/0.02 A (max.)
Supply voltage 2-wire (Ex)
9 ... 28 VDC
Current consumption 2-wire (Ex)
4 ... 20 mA
Permissible load 2-wire (Ex)
< (supply voltage - 9V)/0.02 A (max.)
Cable length
various lengths
Explosion protection
ATEX Gas
II 1G Ex ia IIB/IIC T3 ... T6
ATEX Dust
II 1D Ex iaD 20 IP6x T145 ... T70 ÀC
Standards Gas
EN 60079-0 / EN 60079-11
Standards Dust
EN 61241-0 / EN 61241-11
Temperature class
T6; T4
Approval
Interference emission
EN 55022
Shock
EN 60068-2-27
Vibration
EN 60068-2-6
Interference resistant
EN 61000-4-2; EN 61000-4-3; EN 61000-4-4; EN 61000-4-5; EN 61000-4-6
Hydrostatic level transmitter 681
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EN-GB
Data Sheet 681
Data Sheet
PDF
DE
FR
EN-GB
Operating Instruction 680 681
Operating Instruction
PDF
EN-GB
Explosion protection approval ATEX
Certificate
PDF
EN-GB
681 Explosion protection approval ATEX
Certificate
PDF
DE
EN-GB
681 Konformitätserklärung EMC
Declaration of Conformity
PDF