Linearization is a process of taking a repeatable event and offsetting the anticipated errors, usually in real time, to adjust the data. In the case of a flow meter reporting the liquid passing through it, several mechanical factors will result in a calibration curve that is not a flat line (i.e. you do not get the same number of pulses per volume for all flow rates). The meter’s output curve will typically show more pulses per volume in the middle ranges and lower pulses per volume at the extremely low and high flow rates. Fortunately this response curve is repeatable, so the non-linearity of the curve can be taken into account and smoothed out through compensating software.
All Max meters are calibrated over their entire operating range and the RPM and corresponding pulse output values are stored in the transmitter. This initial calibration guides the transmitter’s software to apply the appropriate factor to convert the natural output to a corrected output. Once this adjustment is set, the output will truly be the same pulses per cc value (K-factor) at all flow rates. This compensation greatly simplifies the use of the Max meters as each meter of a type can be set to the same K-factor; making them interchangeable.
Typical K-Factors by Model:
Model P213 (1000 pulses/cc) Model G004 (500 pulses/cc) Model H241 (15000 pulses/liter)
Model P214 (90 pulses/cc) Model G015 (200 pulses/cc) Model H242 (5000 pulses/liter)
Model P215 (20 pulses/cc) Model G045 (70 pulses/cc)
Model P001 (12,000 pulses/cc) Model G105 (25000 pulses/liter)
Model P002 (1000 pulses/cc) Model G240 (7000 pulses/liter)