Detailed description
Original instructions
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Calculation of the constant k
The constant k can be calculated because of a work point reference, with which the mass flow (MF_REF), the differential pressure (IN_REF), the absolute pressure (P_REF) and the absolute temperature (T_REF) are recognized.
When the input IN is a Differential pressure the equation says as follows:
When the input IN is not a Differential pressure the equation says as follows:
Specification of the calculation
With the calculation, a simple multiplication is entered: . In order to achieve pressure or temperature compensation, the parameters en_pres or en_temp must be set to 1. The square route is also only active when en_sqrt = 1.
When one of the parameters en_sqrt, en_pres, en_temp remains at 0, the calculation of the constant k must be adjusted to correspond (delete the square route, replace from P_REF or T_REF through 1)
Temperature unit
The temperature TEMP can be printed out in degrees Celsius or degrees Fahrenheit, depending on the value of the parameter tc_tf :
tc_tf
Temperature unit from TEMP
0
Degrees Celsius
Calculation of the absolute temperature TA:
1
Degrees Fahrenheit
Calculation of the absolute temperature TA:
Pressure unit
The pressure PRES can be printed out in any unit, as absolute or relative pressure, according to the value of the parameter pr_pa.
pr_pa
Pressure unit from PRES
0
Relative pressure
Parameter pu must conform to the unit 1 atmosphere.
Calculation of absolute pressure: PA = PRES + pu
1
Absolute pressure: PA = PRES