LCT 307i RS 485 Combined Sensor

The LCT 307i combined sensor is designed for continuous measurement of water level, conductivity, and temperature in mineral water wells. A single sensor can thus be used to monitor the condition of mineral water in a well, pool, or borehole.

3-in-1 combined measurement—water level, electrical conductivity, and water temperature.
Continuous monitoring—real-time tracking of measured values.
RS-485 digital communication – reliable data transmission to a host system.
Modbus RTU / HART – support for standard communication protocols.
Compact submersible design – suitable for installation in wells, boreholes, tanks, and other water structures.
Durable construction – stainless steel housing and IP68 protection rating for long-term use in water.
Temperature compensation – digital compensation of level and conductivity measurements for stable results.
One sensor for multiple parameters – eliminates the need for separate sensors for individual measured variables.

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Description

Water level, conductivity, and temperature readings are transmitted sequentially via the RS-485 bus using the Modbus RTU or HART communication protocol. A proven semiconductor sensor with a stainless steel isolation diaphragm is used to measure the liquid level. Conductivity is measured by a 4-wire sensor with platinum electrodes on a ceramic substrate. This configuration enables accurate conductivity measurements over a very wide range. Both the level and conductivity channels are digitally temperature-compensated. The temperature channel is equipped with a Pt 1000 sensor.

Applications

Water Level Monitoring – continuous measurement of water levels in wells, boreholes, and reservoirs.
Water Quality Monitoring – measurement of water’s electrical conductivity as an indicator of its composition.
Water Temperature Measurement – real-time monitoring of the temperature of the measured medium.
Mineral and spring waters – suitable for monitoring water parameters in boreholes and spring areas.
Wells and boreholes – combined measurement of water level, conductivity, and temperature using a single sensor.
Swimming pools and water reservoirs – continuous monitoring of water level and selected water parameters.
Environmental monitoring – data collection for long-term monitoring of water resources.
Remote monitoring – digital transmission of measured values via RS-485 using the Modbus RTU or HART protocol.

Technical specifications

Technical Specifications	H40 - GSM/GPRS Data Logger, Level Sensor
Measured Parameters	water level, electrical conductivity, and water temperature
Water Level Measurement Range	0–4 to 0–200 m H₂O
Conductivity measurement range	5 μS/cm to 200 mS/cm
Temperature measurement range	0 to 70 °C
Measurement accuracy	±0.1% of range
Communication	RS-485
Communication protocol	Modbus RTU / HART
Baud rate	1,200 to 38,400 bits/s
Power supply	8–36 V DC / 3.3–5 V DC depending on model
Level sensor	semiconductor sensor with stainless steel isolation diaphragm
Conductivity sensor	four-wire sensor with platinum electrodes on ceramic
Temperature sensor	Pt 1000
Temperature compensation	Digital compensation for level and conductivity measurements
Probe diameter	27 mm
Material	stainless steel
Protection rating	IP68
Medium	water and other compatible liquids

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