Flomec 490, Instruction Manual

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13 Calibration
4.3 Calculating K-factors
( litres or m³ )
Calculate K-factor ( pulses / litre ) using the above graph and the metric constant of 1273.2 as
follows :
Pulses / litre = 1273.2 x (A) from graph
pipe ID² (mm)
Example ‘a’ :
K-factor for 100mm pipe: 1) from graph 100mm ID (A) = 24.0
2) pulses/litre. = 1273.2 x 24.0
10000 = 3.056 p / litre
K-factor for m³
: multiply by 1000 eg. K = 3056 p/m³
K-factor for megalitres : multiply by 1000000 eg. K = 3056000 p/megalitre
NOTE :
K-factors for Reed Switch output option are 1/3 the standard factors of voltage pulse
output.
22
22.5
23
23.5
24
24.5
25
40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 360 380 400 420 440 460
(A)
pipe ID (mm)
Pipe ID 450mm & above (A) = 22.5
See
example a