Measurement Of Differential Pressure - Metro DataVac DPC 20 User Manual

MANOMETER DPC 20

3.3 Measurement of differential pressure.

If the differential mode has been chosen, the manometer shows the message P1 .
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You have then to measure the first pressure.. By pressing on . the result is
recorded. The manometer then shows the message P2 . You have then to measure
the second pressure The difference between pressures P2- P1 .is then shown. By
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pressing again, you can, if you want, record the difference, the P1 comes back
for the following measurement.
4. USING THE DPC 20 WITH THE SPC400 AEROSOL
The SPC400 Aerosol is a system for quality control designed specially for
manufacture of aerosol cans. It enables analyses of data to prevent manufacture of
bad parts. To use the manometer DPC 20 with the SPC400 Aerosol, they will have to
be connected by the appropriate cable (reference 45310). The setup defined in the
SPC400 Aerosol must include a pressure characteristic (see SPC400 Aerosol User's
Guide).
Note: If the DPC 20 is connected to the SPC 00 Aerosol device, its charge is
maintained automatically.
There are two ways of using the manometer with the SPC400 Aerosol:
4.1 Using the manometer permanently connected
In this case, all measurements are made at one place, and data are transferred to
the SPC400 Aerosol as the measurements are made. The sample size is set to zero
(see 2.4 Sample size). According to the setup defined in the SPC400 Aerosol, the
value for the pressure characteristic will be required at the appropriate time. When
this happens, you just have to make the measurement with the DPC 20, and then
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press to transfer the measured value. The SPC400 Aerosol will then continue the
measurement cycle.
4.2 Walking around measurements with data download
This method allows making a certain number of measurements without having the
manometer connected to the SPC400 Aerosol. This is particularly interesting when it
comes to sample cans on the production line, when for example you wish to perform
statistical process control. Make sure the sample size defined in the DPC 20
corresponds to the one defined in the setup of the SPC400 Aerosol.
The first step is then to make the number of measurements defined by the sample
size. At the end of each sample, the two devices have to be connected through the
appropriate cable to enable download of data from the DPC 20. The download is
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made by pressing on the SPC400 Aerosol each time it requires a pressure
measurement. Please note that the transfer is operated from the SPC400 Aerosol.
Consequently, you do not need to touch the DPC 20 to transfer data. This functioning
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USING THE DPC 20 WITH THE SPC 400 AEROSOL