High Purity

Litre Meter specialise in the design, manufacture and supply of flowmeters. Sierra manufacture a range of high purity and ultra high purity flowmeters for gas applications. Hoffer have a certified turbine meter to 3A standard. Listed below are all the flow meters within our range that are suitable for aggressive or corrosive chemicals:

The immersible thermal sensor is completely immersed into the flow stream. As a result, immersible thermal mass flow meters measure much higher gas mass flow rates in harsher environments than capillary thermal mass flow meters. There is very little pressure drop across an immersible sensor, and the flow does not have to pass through the LFE as it does with a capillary thermal mass flow sensor. HP and UHP versions available from Sierra in inline flow bodied flowmeter styles - 780 and 760. In-line mass flow meters from 0 to 0.7 nm3/h to 0-20000 nm³/h, +/-1% of reading.

Ultrasonic flowmeters measure the travelling times (transit time models) or the frequency shifts (Doppler models) of ultrasonic waves in a pre-configured acoustic field that the flow is passing through to determine the flow velocity. The Sierra range of ultrasonic (transit time) Innovasonic devices are available, click for details. Litre Meter has access to other ranges but the Innovasonic is relatively unique as not only are fixed and portable ultrasonics available but also insertion devices for tougher applications. Perfect for clamping on the outside of plastic piping ultrasonic flow meters can measure water and other liquids over a range of velocities and with a certain amount of solid content. 25mm to 10000mm;±1.0% of reading (also 0.5%); 0 to ±40 ft/s (0 to ±12 m/s).

Inline 'axial' turbine flowmeters are velocity measuring devices - they measure the average velocity of a fluid flowing through the body of the meter. Mounted within the body of a liquid turbine flowmeter is a vaned rotor. The rotor is centred on a shaft and allowed to rotate on bearings. The shaft is supported in the housing by tube bundles that also provide a measure of flow conditioning for the fluid stream. Good for low viscosity chemical flow metering. 3A version available with Triclover triclamp connections. Wide size range and excellent accuracy. 0.24-17 up to 3028-56775 litres/min. Overrange 150% intermittent. ±0.25% reading - typical. ±0.1% repeatability.

Magnetic flowmeters, also known as electromagnetic flowmeters or induction flowmeters, obtain the flow velocity by measuring the changes of induced voltage of the conductive fluid passing across a controlled magnetic field. The fluid has to be conductive so tap water and all water based chemicals are OK. Care has to be taken in measuring solvents, hydrocarbons, de-ionised and demineralised water where electromagnetic flow meters are not normally used due to low conductivity. Internal surfaces are plastic and exotic electrode materials such as platinum and titanium enable corrosive chemicals to be measured. Hygienic fittings available as standard. Contact Litre Meter for full details. 3mm to 2000mm although insertion units can be used up to 3000mm. ±0.2% over flow range 0.5 to 5 m/s; turndown 1000:1; maximum velocity 10 m/s.