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The M4A-AT is an industrial-grade plug-in electronics module developed for continuous liquid level measurement applications. Positioned as the core signal-conditioning unit within the ABB K-TEK AT100 and AT200 series magnetostrictive level transmitter systems, this hardware processes raw electronic returns from the underlying piezo-ceramic sensing elements, converting physical float positions into standardized process variables.
Local Indication with LCD Display
Dual Compartment Housing with Separate Field Terminal Compartment
Designed to Mount Externally to K-TEK KM26 or Other Magnetic Level Gauge
The module operates on a loop-powered infrastructure, drawing a standard operating voltage across a 13.5 to 36 VDC loop connection. Structurally configured to reside inside a dual-compartment explosion-proof housing, the module isolate field terminal wiring from the internal processing board, establishing a physical barrier against environmental ingress and localized moisture. For process automation integration, the component features a built-in RFI/EMI filtering circuit that limits high-frequency noise spikes from nearby industrial switches or heavy machinery, maintaining analog signal stability across extended field cable lengths.
The module outputs a 4-20 mA analog signal combined with HART protocol for simultaneous transmission of level data and diagnostics, enabling integration with DCS and PLC systems. A built-in LCD screen provides local readings, while onboard pushbuttons allow field configuration, including damping adjustments between 0.1 and 36 seconds. The hardware supports a 20-point calibration table for volumetric linearization.
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
K-TEK M4A-AT Electronic Module Manuals, Datasheets, Drivers, Link
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
Oil & Gas Refining
Tracks the physical boundary layer between crude oil and produced water inside high-pressure separator tanks to optimize chemical demulsifier injection rates.
Thermal Power Plants
Interfaces with local bypass chambers to measure level variations down to the micron level under high temperatures, preventing turbine water induction incidents.
Chemical Fertilizer Plants
Utilizes its dual-chamber isolated housing to read real-time ammonia volumes while using its SIL 2 functional safety rating to enforce critical overfill protection alarms.
Pulp & Paper Industrial Mills
Measures highly viscous, corrosive process fluids without mechanical fouling by relying on external magnetic coupling, relaying level updates 10 times per second to prevent tank overflows.
Iron & Steel Smelting
Monitors critical bearing lubrication fluid levels under continuous thermal cycling, outputting alarms via the HART loop if the oil volume drops below safety thresholds.
Mining & Mineral Concentration
Tracks reagent consumption metrics within wide environmental limits, operating reliably from -40°C to +76.6°C amidst airborne dust and corrosive vapors.
When using the K-TEK M4A-AT electronic module, you must maintain a steady input loop voltage between 13.5V and 36V DC to prevent power loss or component degradation. Ensure the dual-chamber enclosure is tightly sealed and its conduits are plugged to protect the internal circuitry from long-term cold condensation, moisture, or chemical vapors. Maintain the operating environment strictly within the -40°C to +76.6°C boundary, and use proper shielding and grounding layouts to block high-frequency electromagnetic noise. Finally, ensure that the internal hardware jumpers for the NE43 burnout fault directions match your specific safety loop configuration, and use the onboard pushbuttons carefully without applying excessive physical pressure.
Alternative Names
Alternative Names
M4A ATM4A
Technical notes
Technical notes
K-TEK M4A-AT is a field-replaceable plug-in electronics module for ABB / K-TEK AT100/AT200 magnetostrictive level transmitters. Operating on a 13.5V–36V DC 2-wire loop, it provides SIL 2 rated single-level measurement via a 4-20mA output with HART protocol and an integrated LCD. Featuring a 10Hz refresh rate and NE43 burnout protection, it operates from -40°C to +76.6°C to feed process data to DCS/PLC networks.
What is the core operating principle of the M4A-AT module?
It utilizes magnetostrictive technology, launching a current pulse down the sensing waveguide and receiving the returning torsional wave to calculate the real-time physical position of the external magnetic float with high precision.
How to properly install and use the M4A-AT?
Securely insert the electronics module into its external protective housing, link the internal waveguide sensor interface, and connect the 4-20 mA signal wires to the terminal cabinet of the central control system.
Which industrial communication protocols does the M4A-AT support?
The module features built-in support for the HART communication protocol, allowing technicians to read internal data or modify process configurations in the field using a handheld communicator.
What is the specific purpose of the M4A-AT?
It is used for the continuous monitoring of total liquid level or the interface level between two fluids of differing densities inside high-pressure storage tanks, chemical reactors, or separators.
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Disclaimer: We are not an authorized distributor or distributor of the product manufacturer of this website, The product may have older date codes or be an older series than that available direct from the factory or authorized dealers. Because our company is not an authorized distributor of this product, the Original Manufacturer`s warranty does not apply.While many DCS PLC products will have firmware already installed, Our company makes no representation as to whether a DSC PLC product will or will not have firmware and, if it does have firmware, whether the firmware is the revision level that you need for your application. Our company also makes no representations as to your ability or right to download or otherwise obtain firmware for the product from our company, its distributors, or any other source. Our company also makes no representations as to your right to install any such firmware on the product. Our company will not obtain or supply firmware on your behalf. It is your obligation to comply with the terms of any End-User License Agreement or similar document related to obtaining or installing firmware.
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