Kimo C310 - Page 20

➢ Go to “Board” line then press OK.
➢ Go to “Air velocity/airflow” line then press OK.
➢ Press OK on “Measure mean” line then use Up and Down arrows to select :
• Pitot tube L (coefficient : 1.0015)
• Pitot tube S (coefficient : 0.84)
• Debimo blades (coefficient : 0.8165)
• le coefficient of the element (free coefficient)
➢ Press OK.
Select the type of section : 3 selections are possible : rectangular or circular section or airflow coefficient.
• For the rectangular and circular sections : see chapter 3.6.1
• For the airflow coefficient :
➢ Press OK on “Section type” line then select “Flow coeff”.
➢ Press OK on “Coefficient” line then enter the coefficient with Up/Down/Left/Right arrows.
➢ Press OK.
➢ Press OK on “Reference unit” line then select the unit with Up and Down arrows.
➢ Press OK.
This airflow coefficient allows to calculate an airflow from the pressure. It is indicated by the manufacturer of the devices
supplied with pressure connections (+ and -). From the square root of the measured pressure (Delta P) and from this
coefficient, you get the airflow. Airflow = C
D
x
√
Δpressure
The coefficient must be between 0.1 and 9999.9.
The available units for the reference unit are : Pa, mmH2O, inWg and mbar.
Enter a correction factor : this correction coefficient allows to adjust the transmitter according to data in air velocity of the
installation.
How to calculate it ? For example, the air velocity in your section is 17 m/s and the transmitter displays 16.6 m/s. The
coefficient to apply is 17 / 16,6 it means 1.024.
➢ Press OK.
➢ Enter the security code then press OK.
➢ Go to the “Parameters” line then press OK.
➢ Go to “Board” line then press OK.
➢ Go to “Correction factor” line then press OK.
➢ Use Up/Down/Left/Right arrows to enter a correction factor then press OK.
The correction factor must be between 0.2 and 2.
Set the compensation in temperature and in atmospheric pressure : it is possible to modify the compensation
temperature value. Indeed, measured air velocity and airflow with a Pitot tube or Debimo blades (or other differential
pressure element) depends on operating temperature. It is required to enter the operating temperature in order to get
more accurate results. It is possible to enter the value manually or to use a thermocouple K probe for an automatic
temperature compensation.
➢ Press OK.
➢ Enter the security code then press OK.
➢ Go to the “Parameters” line then press OK.
➢ Go to “Board” line then press OK.
➢ Go to “Compensation” line then press OK.
➢ Press OK on “Temperature” line then select :
• Manual entry to enter manually a temperature : press OK then select the unit (°C or °F) then enter a value
between -50 and +50 °C.
• Auto (thermocouple) : the transmitter will take into account the measured temperature by a thermocuple probe
connected to the pressure board.
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