Company Announcement - Kobold Instrumentation, represented in South Africa by Instrotech – a Comtest Group company – presents it’s Oval Wheel Flow Meters Model DOM, specifically for fuel consumption measurement in diesel engines using the dual flow inputs and the 'A-B' setting. A pair of DOM flowmeters is used with a single electronic model ZOD-Z3 to give a net reading of fuel consumption. Principle of Operation  The Oval Gear meters are positive displacement flowmeters where the passage of liquid causes two oval gears to rotate within the precision measuring chamber and with each rotation a fixed volume of liquid passes through the meter. Magnets embedded within the gears initiate a high resolution pulse train output. The pulse output can be wired directly to process control and monitoring equipment or can be used as an input to instruments supplied with or fitted directly onto the meter.

The flowmeter is available as a blind transmitter with pulse output capable of interfacing to most monitoring and control instrumentation or the meter can be fitted with or supplied with instruments such as totalisers, rate totalisers or batch controllers. These instruments also have monitoring and control output options including 4-20 mA, scaled pulse, flowrate alarms and batch control logic (preset metering).
This technology allows precise flow measurement and dispensing of most clean liquids regardless of their conductivity, with other liquid characteristics having no or minimal effect on meter performance. This metering technology does not require flow profile conditioning or straightline runs as required with alternative flow technologies making the installation relatively compact and low cost. Positive displacement flowmeters are an inexpensive means to accurately meter high viscosity clean liquids as high as 1 million centipoises however, the appropriate meter must be sized so that the pressure drop across the primary measuring elements (oval rotor), does not exceed the maximum capability of either.

Areas of application are all viscous, non-abrasive clean liquids like: petroleum, grease, pastes, oil, fuels, water, chemicals, ink, etc.  Stainless steel flowmeters are suited to most water based products and chemicals and aluminum meters are suitable for fuels, fuel oils & lubricating liquids. For more information on Kobold’s DOM Diesel Monitoring Flow meter, contact Instrotech on 010 595 1831