EM940 Smart Tank Level Measurement Radar
Honeywell Analytics / Honeywell
New product
Manufacturer: Honeywell Marine
Country of Origin: Honeywell Marine / France design platform
Product Type: Smart radar tank level measurement transmitter / tank gauging sensor
Marine Application: Cargo tank level gauging, ballast tank monitoring, tank inventory measurement, and integrated marine tank gauging systems on tankers and specialized vessels
The equipment shown in your photos is the Honeywell Marine EM940 Smart Tank Level Measurement unit, marked P/N M34372 and described on the nameplate as a pressure sensor / smart tank level measurement device. In Honeywell Marine’s fixed gauging portfolio, the EM940 is part of the EM540 / EM940 radar level gauge family used for accurate tank level measurement on tankers and other marine liquid cargo applications. Honeywell describes the EM940 as a marine-approved radar level gauge for reliable non-contact level measurement in ship tanks.
For shipowners and marine engineers, the EM940 is important because it forms part of the vessel’s cargo monitoring and tank gauging system, helping operators monitor cargo level, ullage, and associated tank data with high accuracy.
The Honeywell EM940 is a marine radar type tank level gauge / tank measurement transmitter designed for installation on ship tanks. It is used to measure tank level continuously and send level information to the ship’s tank gauging control system or central cargo monitoring system.
According to Honeywell marine technical references, the EM940 is used for precise level measurement in liquid tanks, especially on tankers, and is designed as a non-contact radar-based gauge. Honeywell’s published EM940 data indicates a measurement range up to 42,000 mm, high accuracy, and compatibility with marine fixed gauging systems for cargo and ballast applications.
In practical marine service, the EM940 is used where reliable tank level data is essential for:
Key technical features associated with the Honeywell Marine EM940 include:
Honeywell documentation for the EM940 family lists features such as IP66/67 protection, stainless steel housing, marine approvals, and operation in demanding tanker environments.
A typical Honeywell Marine EM940 tank level gauge assembly may include:
In many installations, the EM940 works together with:
The EM940 is commonly used on:
Its role is especially important where vessel operators need continuous and accurate level measurement without manual sounding, improving both safety and operational efficiency.
Possible causes: power / communication fault, damaged cable, interface issue, internal electronics fault, system configuration mismatch.
Check: supply voltage, signal cable integrity, control room interface status, and tank gauging network connections.
Possible causes: incorrect setup, contamination around the antenna / measuring surface, wiring issues, grounding problem, or associated system calibration issue.
Check: inspect installation condition, verify parameter settings, and compare with manual sounding if permitted by vessel procedures.
Possible causes: terminal corrosion, junction box moisture ingress, damaged communication line, or defective interface board.
Check: inspect cable glands, terminal tightness, continuity, and associated tank gauging cabinet modules.
Because the EM940 is installed in certified hazardous areas on many tanker systems, repair and opening procedures must follow the maker’s safety instructions and vessel permit requirements. Use only qualified marine automation technicians for intrusive maintenance.
To keep the Honeywell EM940 reliable onboard:
For tankers, having correct spare identification is important. The nameplate in your photo clearly shows EM940, P/N M34372, and Item 34820-0, which should be referenced during procurement.
The Honeywell Marine EM940 remains widely relevant because tanker operators still depend on accurate cargo tank gauging for safe loading, unloading, custody monitoring, and compliance with operating procedures. Replacing a faulty EM940 with the correct part is often far more practical than modifying the entire tank gauging system, especially on vessels already equipped with Honeywell / Enraf marine gauging architecture.
What is the Honeywell Marine EM940 used for?
It is used for marine tank level measurement in cargo and other liquid tanks as part of a shipboard tank gauging system.
Is the EM940 a radar gauge?
Yes. Honeywell literature identifies the EM940 as part of the radar level gauge family for marine tank gauging.
Can the EM940 be used on tanker cargo tanks?
Yes. It is intended for marine tank gauging applications, including tanker service, depending on vessel system design and certification requirements.
What details should be sent when requesting a replacement?
Send the model EM940, P/N M34372, item number, serial number, tank location, and photos of the nameplate and full unit.
The Honeywell Marine EM940 Smart Tank Level Measurement is a marine radar tank gauging device used for accurate liquid level monitoring in cargo and ballast tank applications. As part of Honeywell Marine fixed gauging systems, the EM940 helps ship operators monitor tank level continuously, improve cargo handling accuracy, and maintain reliable tank inventory data onboard.
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