TEK M4A-AT is an Electronics Module.

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.

M4A-AT

Name: M4A-AT
Brand: K-TEK
SKU: M4A-AT

Electronic Module

Product image is representative; revision or series may vary. Contact us to request a specific version.

Product Describe：

External Mounted
for AT100/AT200 level transmitters
13.5-36VDC loop-powered
4-20mA with HART output, integrated LCD, SIL 2 rated

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Technical specifications for M4A-AT

Manufacturer:

K-TEK
Product Category:

General Automation
Spare Part Number:

M4A-AT
Estimated shipping dimensions:

6.2x5.3x7.6cm
Weight:

0.12 kg
Tariff Code:

8537101190
Counliy of origin:

USA
Supply Voltage:

24 VDC
Operating Voltage Range:

12 - 36 VDC
Power Consumption:

≤ 3.5 W
Operating Current:

≤ 150 mA
Signal Accuracy:

±0.1% of full scale
Isolation Voltage:

1500 VAC
Temperature:

-40 to 170ºF
Humidity:

0 to 100% R.H., non-condensing

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Information

Overview Manuals Common Applications Product Precautions

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

M4A AT M4A

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.

FAQ View All FAQ

What is TEK M4A-AT?

TEK M4A-AT is an Electronics Module.
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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