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The HERMetic UTImeter Gtex is a portable gas tight liquid level gauge designed for closed gauging of hydrocarbons and chemicals. The sensor is calibrated once at the factory and does not require subsequent calibration. The temperature probe is a RTD element. The characteristics of the RTD are stored inside the sensor. The sensor is sending true temperature values to the electronic box. Therefore changing a sensor or a tape does not require a new calibration. The unit is used for custody transfer, inventory control measurement and free water detection on marine vessels when connected to a HERMetic vapour control valve. When fixed on the tank the HERMetic UTImeter Gtex avoids any gas release during operation.

A closed system exists when a marine tank vessel does not permit direct exposure and/or release of the tank contents into the atmosphere under normal operating conditions.
(API MPMS 17.2 A.4.1)


1" Connection 2" Connection

The unit can be ordered with a 1" connection or a 2" connection depending on your needs to fit the HERMetic Gtex to the vapour control valve.
The unit also enables 3, optionally 4 measurements in one single operation

  • Ullage
  • Temperature
  • Oil-water interface level
  • Innage, Reference height

Complies with:

  • IMO
  • SOLAS 74
  • MARPOL 73/78
  • IBC, BCH codes
  • ISO, API, IP
  • EC Directive 89/336/EEC
  • EC Directive 94/9/EC
  • EC Directive 96/98/EC

Approved by:

  • National authorities (USCG, MSA,...)
  • All major classification societies

Technical specifications


  • Continuous temperature reading, ullage and interface detection.
  • Easy access for battery exchange.
  • High accuracy and stability.
  • Chemically resistant to corrosive liquids.
  • Sensor exchange without needs of new calibration.
  • No temperature drift.
  • No degradation of the sensitivity due to sensor aging.
  • Interchangeable adaptors for connection on different vapour control valves.
  • Tape cleaning devices, window wiper and tape protection as standard on all Gtex units.
  • Low maintenance cost.
  • Fully modular unit. Change tape, storage tube, sensor or instrument unit yourself.
  • Easy and detailed instructions in Operation and Service Manual.

Principle of installation

A gauge dedicated to your application

  • HERMetic UTImeter Gtex with 1" sensing probe, FKM gaskets for the main applications in hydrocarbons.
  • HERMetic UTImeter Gtex Chem with 1" sensing probe, FFKM gaskets and tape connector for use in corrosive liquids.
  • HERMetic UTImeter Gtex Visc and HERMetic UTImeter Gtex Chem Visc with 2" load on the sensing probe, recommended for operation in high viscous products or for innage measurements in hydrocarbons or in corrosive liquids. Manual detection of tank bottom.

Operation Manual HERMetic UTImeter Gtex

Operation Manual HERMetic UTImeter Gtex Chem