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한국의 
Differential Flow Computer ZFC
With temperature compensation
Measuring range: 0.000 010 ... 9 999 999 with variable decimal position
Input: coil / sine wave (HI: 20 mVpp or LO: 80 mVpp -sensitivity selectable), NPN/PNP, Open Collector, reed switch, Namur, active pulse signals 8, 12 and 24 VDC
Digital output: 2x contact NPN, max. 50 VDC - 300 mA
Analogue output: 4-20 mA
Power supply: 8-24 VAC/DC
Operating conditions: -40 ... +80°C (-40°F ... +176°F)
Communication: interface RS485, Modbus RTU
Display: LED backlight, LCD with large 17 mm digits, sensor supply
Datasheet
Operating Instructions
Miscellaneous
Description
The flow computer model ZFC has been developed to calculate corrected differential liquid volume at normal conditions for generic products. A typical application is the measurement of fuel consumption by engines for power generators, e.g. on board ships and locomotives. The usual difficulties encountered in such applications include: pulsating flows, very low consumption readings, vibration and high ambient temperatures. These are all well catered for in the design and operation of the ZFC. The corrected volumetric flow in each line is calculated using the thermal expansion coefficient algorithm stored in the flow computer. The reference temperature can be defined as desired, e.g. 15 °C, 20 °C or 60 °F. The ZFC is your first and safest choice for field mount indicators, especially in harsh weather conditions like rain, snow, salty atmospheres and temperatures between -40 °C up to +80 °C (-40 °F up to 176 °F).
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