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Level measurement in open containers with our hydrostatic probes

Level measurement in open containers with our hydrostatic probes

Hydrostatic probes allow for precise level measurement in unpressurised, open tanks and vessels as well as in underground applications such as shafts, wells and boreholes. Depending on how they are accessed, the level is detected via submersible or screw-in probes.

Our probes convert pressure directly into an electronic standard signal in order to display the level in analogue form, e.g. in litres, m³, kg or %. We recommend the use of immersion probes especially for difficult mounting positions. For installation, it should be noted that the immersion probe is suspended from the top of the tank.

The screw-in probe must be fitted directly into the tank through a screw thread at the lowest point to be measured near the bottom.

Principle of our hydrostatic level gauge

The probes are available in stainless steel and ceramic versions. This means they can be used both in water and oily liquids, as well as in aggressive media. A membrane inside the measuring element is formed according to the pressure of the fluid column in the tank. Behind this, a piezoresistive silicon chip generates an output signal of 4...20 mA / 0...10V proportional to the atmospheric pressure via a built-in microcontroller.

Evaluation and display units

Our programmable digital display AD313, designed for panel mounting, offers a scaling function to display individual output values (litres etc.) as level-describing parameters. Moreover, adjustable limit values can be monitored by means of an alarm function as a relay output with this device. For this, you also need the top-hat rail evaluation units TK-313 or TK-315 to show the filling level in per cent. With the TK-313, two limit values can be monitored whilst with the TK-315 even four values can be observed using a relay output. The application described above is illustrated below.

Advantages of our hydrostatic level sensors

  • Precise measurement, even with difficult tank or container designs
  • High media compatibility
  • Applicable even in combination with aggressive media
  • High reliability along with a long service life
  • Available as a complete system
  • 4…20 mA output signal
  • Excellent for level detection

A quick look at our product range for hydrostatic level measurement

 

Immersion probe - hanging version: HD-100 | HD-102 | HD-103

Measuring range: 0.8…10 mWs (other ranges available upon request)

Accuracy: <2% of final value

Housing: Stainless steel 1.4571 | PVC | PVDF

Measuring cell: Stainless steel 1.4404 | Ceramics 96% | Ceramics 99.9%

Supply voltage: 15…30 V DC

Output signal: 4…20 mA

Operating temperature: -10…70 °C (PVC -10…60°C)

Type: Hanging probe

General information on hydrostatic level measurement

Data sheet HD-100 | HD-102 | HD-103

Screw-in probes: HD-110 | HD-112 | HD-114

Measuring range: 0.8…10 mWs (other ranges available upon request)

Accuracy: <2% of final value

Housing: Stainless steel 1.4571 | PVC | PVDF

Measuring cell: Stainless steel 1.4404 | Ceramics 96% | Ceramics 99.9%

Supply voltage: 15…30 V DC

Output signal: 4…20 mA

Operating temperature: -10…70 °C (PVC -10…60°C)

Type: Screw-in probe

General information on hydrostatic level measurement

Data sheet HD-110 | HD-112 | HD-114

Programmable digital display: AD-310 | AD-313

Universal measuring inputs: Current 0…20 mA DC | Voltage 0…10 V DC | Potentiometric voltage divider 1...100 kΩ

Display: LED 14mm, 5-digit

Operation: Membrane keys

Display range: -19999…32000

Analogue output: 0…20 mA

Measuring inaccuracy: ±1 % or ±1 digit

Two programmable limit switches

Programmable relay function

Data sheet AD-31x

Evaluation unit with two and four limit switches: TK-313 | TK-315

Operating temperature: -20…+60 °C

Nominal voltage: 24…230 V AC/DC

Input ssignal: Current 0…20 mA | Voltage 0…10 V | Resistor in three-wire circuit RG 0–4...10 kΩ

Output switch contacts: TK-313 two changeover contacts | TK-315 four changeover contacts

Switching voltage: max. 250 V AC

Fastening: Mounting rail according to EN 50022

Display: 2-digit, 7-segment

Data sheet TK-313

Data sheet TK-315

Last modified onTuesday, 08 June 2021 09:39