Litre Meter Press Release

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The next generation flagship Smart Trak Model 100 digital mass flow meter – the Smart Trak 2 from Sierra Instruments ( – is now available in the UK from Litre Meter (

Smart-Trak 2 features Dial-A-Gas® technology with up to ten pre-programmed gases with the same unit. Its internal microprocessor is pre-programmed with ten gases that are commonly used in biotech, pharmaceutical, analytical and research applications – others gases can be substituted to customise the flowmeter. This technology allows the instrument to be used for multiple applications, creating greater flexibility as well as helping to reduce its spares inventory.

The Smart Trak 2 has an accuracy of +/- 0.5 per cent of full scale and can measure flow ranges from 0-10 standard cubic centimetres per minute (sccm) to 0-1,000 standard litre per minute (slpm).

Constructed in 316 stainless steel, the instrument features a fast-response control valve and primary standard calibration and NIST traceability. It also has a pilot module which replaces expensive control and readout electronics, available mounted to the face of the instrument or in a convenient hand-held version. It enables a range of control functions including gas type, setpoint value and source, engineering units, output signal and valve state – open, closed or automatic.

These control functions are also available from a PC via RS-232. Source code for RS-232 communication is provided but it has multi-drop RS-485/MODBUS RTU capability using Sierra’s Compod™.

The Compod enables simple gas processes like gas mixing and blending, batch control, leak testing and process monitoring at a fraction of the cost of complex programmed logic controllers (PLCs). A Compod, coupled with Sierra’s Smart-Trak® mass flow meters and controllers, simplifies basic flow control installations and permits networking of multiple instruments using open source MODBUS RTU protocol. Two digital outputs and one analogue input can be configured by the end user for a wide variety of process controls. Unlike dedicated PLCs, a Compod is a small device that mounts locally to the face of the Smart-Trak MFC.

Litre Meter, a leading manufacturer and supplier of custom flow meters, is the UK distributor for the Sierra Instruments range of flow meters. As with Litre Meter’s own range of custom flow meters, Sierra Instruments’ range is designed to operate in some of the harshest conditions on the planet.