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  •   Submersible hydrostatic liquid level sensor | level transmitter | RS485 | DC 12–36 V | for water, oil and other liquids | stainless steel probe
      Submersible hydrostatic liquid level sensor | level transmitter | RS485 | DC 12–36 V | for water, oil and other liquids | stainless steel probe 1
      Submersible hydrostatic liquid level sensor | level transmitter | RS485 | DC 12–36 V | for water, oil and other liquids | stainless steel probe 2
      Submersible hydrostatic liquid level sensor | level transmitter | RS485 | DC 12–36 V | for water, oil and other liquids | stainless steel probe 3

    Submersible hydrostatic liquid level sensor | level transmitter | RS485 | DC 12–36 V | for water, oil and other liquids | stainless steel probe

    Code: ES-YWTT1M-RS485
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    Price 242.00 € VAT incl.
    ( 200.00 € VAT excl. )
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    Submersible liquid level sensor / transmitter designed for measuring the level of water, oil and other liquids that are non-aggressive to stainless steel. The sensor measures the pressure of the liquid column and transmits a signal to an automation system, controller, indicator, PLC or other control equipment.

    This model can be used in reservoirs, water tanks, wells, boreholes, technical water systems, oil tanks, wastewater or drainage systems where continuous liquid level monitoring is required. 

  • Product description

    Submersible hydrostatic liquid level sensor / level transmitter – RS485, DC 12–36 V, stainless steel probe

    Submersible hydrostatic liquid level sensor / level transmitter for continuous level monitoring in tanks, reservoirs, wells and process systems. The probe is immersed in the liquid and measurement data is transmitted via a digital RS485 interface to a controller, PLC, display or other automation system.

    This version is powered from DC 12–36 V. The probe is made of stainless steel and is intended for water, oil and other liquids compatible with the probe and sealing materials.

    Important when selecting:
    this product family may be available with different outputs such as 4–20 mA, 0–10 V and RS485. This description refers to the RS485 version. Measurement range, accuracy, RS485 protocol / register map, cable length and stainless-steel grade must be verified for the exact ordered version.
    Output
    RS485
    Power supply
    DC 12–36 V
    Measurement principle
    hydrostatic
    Probe
    stainless steel

    For engineers / power engineers / automation specialists

    The transmitter is intended for applications requiring continuous digital level measurement. RS485 is particularly useful where the measured level must be integrated into a PLC, RTU, data logger, SCADA or remote monitoring system.

    Typical tasks:
    • water level measurement in tanks and reservoirs;
    • monitoring wells, process tanks and vessels;
    • level monitoring of oil or other compatible liquids;
    • pump control based on measured level;
    • high / low level alarms implemented in the controller;
    • transmission of level data to SCADA or remote monitoring systems;
    • process level monitoring and data logging.

    Operating principle

    The immersed probe measures the hydrostatic pressure created by the liquid column. The higher the liquid level above the sensing element, the higher the hydrostatic pressure. Integrated electronics process this value and transmit level information through the RS485 interface.

    Engineering note:
    hydrostatic level measurement depends not only on liquid height but also on liquid density. If the measured medium differs significantly from water, or its density varies with temperature or concentration, the level conversion in the controller should be evaluated separately.

    Technical data

    Type Submersible hydrostatic level sensor / transmitter
    Measured variable Liquid level
    Output / communication RS485, digital
    Supply voltage DC 12–36 V
    Probe Stainless steel
    Installation Submersible
    Suitable liquids Water, oil and other liquids compatible with probe, seal and cable materials
    Measurement range Verify for exact ordered version
    Accuracy Verify for exact ordered version
    RS485 protocol / registers Verify in documentation for the exact version
    Cable length According to selected configuration

    RS485 integration

    RS485 enables digital measurement transmission over longer distances than a typical 0–10 V analogue signal and is convenient for industrial automation integration. Before connection to a PLC or controller, the communication parameters of the exact model must be checked.

    For RS485 design, verify:
    • RS485 A/B conductor assignment;
    • communication protocol;
    • device address;
    • baud rate;
    • parity, stop-bit and data-bit settings;
    • register addresses and scaling of transmitted values;
    • whether line-end termination resistors are required;
    • shielding and grounding concept.
    RS485 ≠ automatically Modbus RTU:
    RS485 defines the physical communication layer, not the higher-level protocol. State “Modbus RTU” only when confirmed by the manufacturer's documentation for the exact version.

    Installation in a tank or reservoir

    • The probe should be fully immersed in the measured liquid.
    • Do not install directly in the impact zone of an incoming liquid stream.
    • Avoid locations with strong turbulence, air bubbles or intensive mixing.
    • The probe should not rest on the tank bottom if this can mechanically load the sensing element.
    • Fix the cable so that its weight and tension are not transferred to the probe sealing assembly.
    • If the cable contains an atmospheric-pressure compensation vent, keep the vent dry and unobstructed.
    Do not select solely by liquid name:
    actual suitability for oil, fuel, chemicals or aggressive liquids depends not only on the stainless-steel probe but also on the diaphragm, seals and cable jacket. Material compatibility must be checked for the specific medium.

    Power supply and EMC

    The transmitter uses a 12–36 V DC supply. In industrial environments, use a stabilised DC power supply and route the sensor communication cable separately from variable-frequency drives, motors, contactors and other strong electromagnetic interference sources.

    For the RS485 line:
    in practice, a shielded twisted pair is recommended. Follow bus-topology principles and avoid long stubs. Shield connection and grounding should follow the EMC concept of the complete automation system.

    Selecting the measurement range

    The hydrostatic transmitter range should be selected according to the maximum actual liquid column height, not only the geometric height of the tank. Consider:

    • maximum operating level;
    • possible overflow level;
    • liquid density;
    • probe installation height above the tank bottom;
    • required measurement reserve;
    • level scaling used in the controller.
    An unnecessarily large range reduces practical resolution:
    if a transmitter with a much larger range is used for a low tank, only part of its measurement span is utilised. Select a range close to the actual process level while retaining a reasonable safety margin.

    Use according to application

    Water systems

    For tanks, wells, reservoirs and process-water level measurement.

    Industrial automation

    For level monitoring, alarms and process control in PLC / SCADA systems.

    Pump control

    For automatic pump start/stop or multi-level control logic in a controller.

    Remote monitoring

    For transmitting level data to remote controllers, telemetry devices or data loggers.

    Advantages and limitations

    Advantages

    • Digital RS485 output.
    • Wide DC 12–36 V supply range.
    • Submersible design.
    • Stainless-steel probe.
    • No moving float mechanism.
    • Convenient integration into PLC / SCADA systems.
    • Suitable for continuous level monitoring.

    Limitations

    • Measurement is influenced by liquid density.
    • RS485 parameters must match the controller.
    • Chemical compatibility must be checked for the specific medium.
    • Strong turbulence may reduce measurement stability.
    • Measurement range must be selected for the real process level.
    • Modbus RTU must not be assumed from RS485 alone.

    Commissioning and verification sequence

    1. Check the measurement range of the ordered version.
    2. Check power-supply polarity and the DC 12–36 V source.
    3. Verify RS485 A/B wiring according to the manufacturer's diagram.
    4. Set the required communication parameters in the controller.
    5. Verify data scaling and engineering units.
    6. Compare the indicated level with a known actual liquid level.
    7. Set high- and low-level limits in the PLC / SCADA system.
    8. Document device address, range, communication parameters and scaling in the project documentation.

    Engineer checklist before ordering

    • What is the maximum liquid level, m?
    • What is the density of the measured liquid?
    • What is the liquid temperature?
    • Are probe, diaphragm, seal and cable materials compatible with the medium?
    • What cable length is required?
    • What exact RS485 protocol is used?
    • What are the communication settings and register addresses?
    • Will it connect to a PLC, RTU, SCADA or separate display?
    • Are there strong EMC interference sources on site?
    • Does the cable use atmospheric-pressure compensation and how will the vent end be protected?

    Frequently asked questions (FAQ)

    Is RS485 an analogue output?
    No. RS485 is a digital communication interface. 4–20 mA and 0–10 V are examples of analogue outputs.
    Is DC 12–36 V the output signal?
    No. DC 12–36 V is the sensor supply voltage. Measurement data in this version is transmitted through RS485.
    Can it be used in oil?
    Only if the specific oil is compatible with all wetted probe, sealing and cable materials. A stainless-steel body alone does not confirm chemical compatibility.
    Does RS485 mean the sensor uses Modbus RTU?
    Not necessarily. RS485 is the physical interface. The actual protocol must be verified in the manufacturer's documentation.
    Can the probe simply be dropped onto the bottom of a tank?
    It is better to install it so the probe is not mechanically loaded, does not rest on the bottom, and is not directly exposed to strong inflow or turbulence.

    RS485 level measurement for industrial automation

    The submersible hydrostatic level transmitter is intended for liquid level measurement and digital data transmission to PLCs, controllers and remote monitoring systems.

    RS485 + DC 12–36 V + stainless-steel submersible probe – a practical solution for tanks, wells, process vessels and other liquid-level automation tasks.

    Illustrative image may have been created using AI. The appearance of the product may differ slightly from the image shown. Please refer to the technical specification.

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