HART liquid level transmitters for configuration via a distributed control system (DCS) or HART communicator. HART liquid level transmitters are compatible with the Highway Addressable Remote Transducer (HART) communication protocol which is the most popular standard used with smart field devices by the process control industry. HART functionality enables the transfer of liquid level transmitter data via an AC digital signal which uses the 4-20mA analogue output signal as a carrier, thus eliminating the need for extra wires and connectors.
- LMK458 Marine Approved Hydrostatic Level Transmitter - Marine approved level transmitter with 4-20mA output for measuring level of contents inside ship ballast, fuel, liquid cargo or wastewater tanks
- DPT200 Pressurised Tank Level Differential Pressure Transmitter - Pressurised tank liquid level differential pressure cell transmitter for process plant storage.
- LMK457 Marine Approved Level Transmitter - Marine approved level transmitter with 4-20mA current loop output for shipbuilding with optional all CuNiFe construction for sea-water compatibility in ranges from 0.4 mH2O to 250mH2O gauge.
- LMK382 Low Range IP68 Waste Water Level Transmitter - Submersible Low Range waste water level transmitter with intrinsically safe option for monitoring the level of sewage and effluent in water treatment plants.
Device information retrieval
What type of information can you retrieve from a liquid level transmitter using HART communications?
All types of HART enabled liquid level transmitters are required to include the following device information, which are retrieved using Universal Commands:
- Manufacturer name
- Product type
- Liquid level value and units (Primary Variable)
- Output signal and % of scale
- Message (32 characters)
- Liquid level range (Lower Range Value – LRV & Upper Range Value – URV)
- Liquid level range limits (Lower Sensor Limit LSL & Upper Sensor Limit USL)
- Liquid level unit
- Damping time constant
- Final assembly number
In addition to the above Universal Commands a manufacturer may also include further device information such as:
- Tag number
- Device ID
- Temperature value and units (Secondary variable)
- Software version number
User device configuration
What can you configure on a liquid level transmitter using the HART coms protocol?
There are some basic operations that are essential for a user to configure in the field such as the following which are usually available via most HART communication terminals:
- Re-range LRV & URV
- Change the damping time constant value
- Set Tag number
- Change liquid level units
Checklist for HART liquid level transmitter requirements
Define your HART liquid level transmitter requirements using this checklist:
- Liquid level range?
- Output signal? 4-20mA with HART coms
- Electrical connection?
- Process connection?
- Process media type?
- Hazardous area?