SKU: SENS-1376
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FirstRate FST700-101 Submersible Liquid Level Transmitter Sensor, Range 0-2M, 4-20mA, 9-30V, IP68

₹8,209.00 (Inclusive of all taxes)
Out of Stock

The FirstRate FST700-101 is a submersible 4-20mA liquid level transmitter designed for continuous level monitoring in tanks, wells, and sumps. Featuring a 316L stainless steel probe and IP68 waterproof rating, it provides a robust, two-wire current loop output compatible with industrial PLCs, DCS, and data acquisition systems.

Features

  • 4-20mA two-wire current loop output for robust industrial signal transmission.
  • 0-2 meter H2O measurement range with ±0.5% FS accuracy.
  • 316L stainless steel probe construction for corrosion resistance in harsh liquids.
  • IP68 submersible rating and wide -40°C to +125°C storage temperature tolerance.
  • Wide 9-30V DC supply voltage range for flexible system integration.

Out of stock

Description

The FST700-101 operates on the hydrostatic pressure principle, where the sensed pressure is proportional to the height of the liquid column above the sensor’s diaphragm. This pressure is converted into a precise 4-20mA analog current signal, providing excellent noise immunity over long cable runs typical in industrial installations.

Its fully sealed 316L stainless steel housing and IP68 rating ensure reliable operation when fully submerged in a wide variety of liquids, including water, mild chemicals, and wastewater. The integrated 3-meter cable simplifies installation directly into process vessels.

Key Features

  • High-precision silicon piezoresistive sensor with ±0.5% full-scale accuracy.
  • Two-wire 4-20mA output simplifies wiring and is industry-standard for process control.
  • Corrosion-resistant 316L stainless steel wetted parts for extended service life.
  • IP68 submersible construction for direct immersion without an external housing.
  • Wide operating and storage temperature range for demanding environments.
  • Broad 9-30V DC input voltage compatibility with reverse polarity protection.
  • Zero and span calibration accessible for field adjustment to specific tank heights.

Applications

  • Continuous level monitoring in industrial water storage tanks and reservoirs.
  • Submersible pump control and dry-run protection in wells and boreholes.
  • Liquid level measurement in chemical process tanks and sumps.
  • Wastewater level monitoring in treatment plants and lift stations.
  • Fuel tank level sensing in agricultural and marine applications.

Technical Specifications

Model NumberFST700-101
Measurement Range0 - 2 m H2O
Output Signal4-20mA (Two-Wire)
Supply Voltage9 - 30V DC
Accuracy±0.5% FS
Probe Material316L Stainless Steel
Probe Diameter28 mm
Cable Length3 m
Ingress ProtectionIP68
Storage Temperature-40°C to +125°C

Frequently Asked Questions

What is the wiring diagram for the two-wire 4-20mA output?

The FST700-101 uses a simple two-wire loop. Connect the positive supply voltage (9-30V DC) to the red wire. The black wire completes the circuit to your PLC/DCS analog input or a precision resistor. The current flowing through this loop (4-20mA) is directly proportional to the liquid level. Ensure your power supply and readout device share a common ground.

Can this sensor be used with corrosive liquids like acids or seawater?

The 316L stainless steel wetted parts offer good corrosion resistance against many mild chemicals, fresh water, and wastewater. For highly corrosive acids, strong alkalis, or chlorinated seawater, a sensor with Hastelloy or Tantalum diaphragm material is recommended. Always verify chemical compatibility for your specific fluid.

How do I calibrate the 0 and 100% level points on this transmitter?

Calibration typically requires adjusting zero (4mA) and span (20mA) potentiometers located inside the sensor's cable gland or head. To set zero, place the probe at the empty (0m) level and adjust for 4.00mA output. For span, place it at the full-scale (2m) level and adjust for 20.00mA output. Some models may require a communicator for digital calibration.

What is the maximum depth I can submerge this IP68 sensor?

The IP68 rating indicates it is protected against continuous immersion. The specific depth limit is determined by the sensor's pressure range, not just the seal. Since this model is rated for 0-2 meters of water column (approximately 0.2 bar), it is designed for reliable operation at depths up to and including its full 2-meter range. Do not exceed this rated pressure.

Package Includes

  • FST700-101 Liquid Level Transmitter Sensor
  • Pre-attached 3-meter signal/power cable
  • Installation and specification documentation

Additional Information

Weight 0.545 kg
Dimensions 21 × 13 × 12 cm

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