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Level sensor in 4 - 20 mA loop for city water supply

2015-06-14

Hello sir, I am using SS634 level sensors from your company . Could you give me some example of connection sensor in 4-20mA loop ? I am not sure if I have to connect + of voltage supply to red or blue wire of sensor , i. e. if current goes from sensor from red or blue wire ? The sensor is protection against reverse polarity and is fully calibrated in two points, 4mA @ 0cm, and the 20mA @ the max(depended on the sensor). I am making level monitoring of drinking water in one of pools in city watter supply, would need probably sensors for water depths for 1m, 2m and 5m , 4-20mA output .


SS634 Series Submersible Pressure Sensor for level and depth applications

CE conformity

Hermetically sealed

Protective cap included

Stainless steel 316L diaphragm

All stainless steel structure, oil filled

Various power supply: 1.5mADC, 5VDC,12~36VDC

AK Fluids US silicon oil, nontoxicity, good bio-compatibility

Output signals: 4-20mA, mV and 0-10V, 0-5V voltage output

Pressure ranges in gauge or absolute from 0.05 up to 20 bar

Descriptions

SS122/634/634P series submersible pressure sensors use piezoresistive technology, oil filled, all stainless steel integrated structure with IP68 grade, suitable for liquid level and depth measurement. Their all stainless steel, hermetically sealed housing makes them suitable for immersion in most industrial liquids and oils, are designed to give accurate readings at pressure ranges from 50 mBar up to 20 Bar (corresponding to water column depths of 0.5 m to 200 m).


The electrical connection is a special designed PE cable with air tube and the pressure connection part is an exposed 316L stainless steel diaphragm, no pressure port and no blocking problems, easy for daily maintenance. The all-welded design eliminates the need for an O-Ring seal, thereby eliminating potential leak paths. Typical applications including water and sewage treatment plants, water level monitoring at reservoirs/dams, down-hole water wells.


SS122 series are designed with mV output signal with 1.5mA, 1.0mA, 3VDC or 5VDC supply.

SS634 series are designed with amplified signals, 4-20mA output or 0-10V, 0-5V voltage output.

SS634P series are fitted with a welded pressure connection 1/4”BSP, as standard to give the very best in media compatibility and integrity other pressure connection is on request. Available with standard voltage and 4-20mA current outputs.


Technical data

Performance (EN 60770)

Total error band (inside the compensated temperature range)

±0.5%

Response time

< 4 ms

Overload pressure

2 × FS

Pressure range

0~5mbar20bar

Pressure type

vented gauge

Stability

≤0.2%FS/Year

Temp coefficient

±0.03%FS/°C


Environmental conditions

Medium temperature range

-40°C +100°C

Ambient temperature range

-20°C → +80°C

Compensated temperature range

0°C +60°C


Mechanical characteristics

Materials

Diaphragm

Stainless steel 316L

Enclosure

Stainless steel 304

Cable

PE

Weight (depending on cable length)

0.5 - 2.0 kg

Sealing rating

IP68