8. F 500: Set the pressure measurement
This part allows to set an integration coefficient, to perform an autozero, to set a delay time between two auto-zeros.
In order to compensate a possible drift of the sensor, it is possible to add an offset and/or a coefficient to the value
displayed by the transmitter.
8.1. Perform an auto-zero
CPE 310-S and CPE 311-S transmitters have a manual auto-zero which guarantees a good reliability of the measurement
in high and low ranges.
The auto-zero compensates for any long-term drifts of the sensitive element, with the manual adjusting of the zero.
To perform a self-calibration:
➢ Press Esc during 8 seconds.
8.2. Integration of the pressure measurement
The pressure measurement element is very sensitive and reacts to pressure changes. When making measurements in
unstable air movement conditions, the pressure measurement may fluctuate. The integration coefficient (from 0 to 9) makes
an average of the measurements ; this helps to avoid any excessive variations and guarantees a stable measurement.
New displayed value = [((10 - Coef.) x New Value) + (Coef. x Old value)] /10
Example: CPE 311-S (0-1000 Pa) – Current measurement: 120 Pa – New measurement: 125 Pa
The pressure source being stable, the user selects a low integration. Integration: 1, maximum admitted variation ±10 Pa.
The variation is lower than 10 Pa, it is possible to apply the integration calculation formula.
Next displayed value = ((9 * 125) + (1 *120 ))/10 = 124.5 i.e, 124 Pa. If the new measurement had been de 131 Pa, the
next displayed value would have been 100% of the new value i.e, 131 Pa.
The transmitter is powered on.
➢ Press OK.
➢ Enter the activation code (see page 9).
➢ Press OK.
➢ Press Up key to go to F 500 folder.
➢ Press OK.
➢ Set the integration value with Up and Down keys.
This value is between 0 and 9 with:
• Coefficient 0: no integration, important fluctuation of the displayed value
• Coefficient 9: maximum integration, more stable measurement display.
8.3. Delay times between 2 auto-zeros
It is possible to set an interval between two self-calibrations.
The transmitter is powered on.
➢ Press OK.
➢ Enter the activation code (see page 9).
➢ Press OK.
➢ Press Up key to go to F500 folder.
➢ Press OK.
➢ Press Up key to go to F510 folder.
➢ Press OK.
The duration between 2 self-calibrations is displayed.
➢ Set the duration with Up and Down keys.
This delay time must be between OFF (no self-calibration) and 60 minutes.
➢ Press OK to validate the duration.
20 F 500: Set the pressure measurement
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