E+H Digital Transmitter TMD1 for Tank Gauging Systems

Advanced Remote Tank Inventory Monitoring with Endress+Hauser TMD1

The Endress+Hauser Digital Transmitter TMD1 is a specialized tank gauging transmitter engineered to digitize, calculate, and transmit critical tank inventory data—including continuous liquid level, average/spot temperature, and limit alarms. Operating in tandem with mechanical float level gauges (such as the Endress+Hauser LT5 series), the TMD1 serves as an essential communication bridge between field level instruments and central supervisory systems (DCS, PLC, TankVision, or SCADA) in oil refineries, petrochemical terminals, and chemical tank farms.

Modular Architecture & Multi-Protocol Integration

The standout feature of the Digital Transmitter TMD1 is its highly flexible modular card structure. Users can customize or upgrade system functionality simply by inserting dedicated I/O and communication modules:

• Level Conversion Modules: Microprocessor-driven encoders convert mechanical rotation from float level gauges into high-precision digital Gray code or pulse signals.

• Temperature A/D Modules: Connects to spot temperature sensors or multi-element average temperature transmitters (such as Prothermo NMT53x series) via direct input or local HART communication.

• Versatile Transmission Drivers: Supports standard industrial tank gauging protocols including V1, BCD, Sakura, 2-wire transmission, and 4–20 mA analog I/O.

• Control & Alarm Outputs: Manages external relay contact inputs and alarm outputs for high/low level limit signaling and local pump/valve interlocks.

Key Performance Features & Operational Advantages

• Direct Mechanical Coupling: Mounts directly onto mechanical float gauges (LT5), converting tape/wire linear displacement into precise digital level readings.

• Modular Plug-In Functionality: Allows effortless functional upgrades, protocol expansion, or maintenance field replacements without changing the main transmitter housing.

• Hand-Held Terminal Optical Port: Features an external optical connector that enables safe local configuration, command alignment, and diagnostics via a hand-held terminal without opening the flameproof enclosure in hazardous areas.

• Robust Explosion-Proof Build: Built with a heavy-duty Ex d IIB T4 / FM XP Class I Div. 1 flameproof enclosure to withstand aggressive outdoor marine and refinery weather.

• Retrofit Compatibility: Easily connects to both new installations and existing legacy tank gauge systems to modernize plant automation infrastructure.

Enhanced Tank Safety & Inventory Control

By continuously transmitting precise level and temperature measurements to central control rooms, the TMD1 supports accurate volume calculations, custody transfer compliance, overfill prevention, and real-time loss control across complex bulk liquid storage facilities.

Applications

• Oil & Gas Refineries: Storage tanks for crude oil, gasoline, diesel, jet fuel, and heavy fuel oils.

• Petrochemical Terminals: Bulk liquid chemical storage, solvent distribution hubs, and asphalt tanks.

• Chemical Manufacturing: Acid/alkali storage vessels, monomer tanks, and polymer liquid holding facilities.

• Marine & Tank Farm Depots: Offsite tank farms, harbor terminal storage, and commercial pipeline distribution hubs.

Technical Specifications

Parameter / Feature	Specification Details
Device Type	Digital Tank Gauging Transmitter
Compatible Gauges	Float Level Gauges (Endress+Hauser LT5 series)
Monitored Variables	Continuous level, multi-point/average temperature, alarm status
Communication Protocols	V1, BCD, Sakura, HART, 2-wire / 2-way transmission, 4–20 mA
Module Options	Remote transmission, temp A/D conversion, level alarm, status input, DAC/ADC
Operating Temperature	Weatherproof: -20 °C to +60 °C (-4 °F to +140 °F) | Flameproof: -20 °C to +40 °C
Power Supply Options	100 V AC, 110 V AC, 200 V AC, 220 V AC (50/60 Hz)
Explosion Protection	Ex d IIB T4 / FM XP Class I, Div. 1, Groups C-D, AEx d IIB T4
Ingress Protection	Weatherproof / Flameproof heavy-duty terminal enclosure
Local Interface	Optical connector for Hand-Held Terminal (HHT2)
Certifications	FM, TIIS explosion-proof approvals

FAQ

Q1: What field gauges work in combination with the Digital Transmitter TMD1?

Answer: The TMD1 is specifically designed to couple mechanically with float level gauges, such as the Endress+Hauser LT5 series, for remote data conversion and transmission.

Q2: Can the TMD1 transmit temperature data alongside level readings?

Answer: Yes, with dedicated temperature A/D modules or HART communication cards, the TMD1 connects to spot temperature sensors or multi-element average temperature sensors (such as NMT53x).

Q3: How is local parameter setup performed in hazardous field areas?

Answer: The TMD1 features an optical connector port that allows operators to connect a hand-held terminal for field configuration and command alignment without opening the Ex d housing.

Q4: What protocols are supported by the TMD1 for host system integration?

Answer: The TMD1 supports various communication driver modules including V1, BCD, Sakura, 2-wire transmission, and HART protocols.

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