Manual

4.1.7 Pressure sensor calibration (must be done at first use of the machine)

for vacuum full versions with pressure sensor

Reasons and procedures

Firmware rel. W8VD1A V4.4 and subsequent versions

This machine is equipped with a very precise “relative pressure” sensor that allows

you to automatically manage optimal operation time without having to carry out

checks or manual settings.

To use the vacuum sensor, all you need to do is make sure the machine is powered

up and turned on, then check that the letters “AA” appear on the right of the display;

this shows that the automatic vacuum is functioning.

Otherwise, move to the MENU button (button 6) in the D display field and, using

button 3 and 4, select the automatic program position AA.

The relative pressure is the difference between the location’s air pressure and the

desired final vacuum point (you can select from 1, 5 or 10 Mb as in the manual in

point 4.1.2).

This relative pressure is, however, affected by the air pressure of the place where

the machine has been installed, which may differ substantially from the one in which

the machines are produced and tested (20 m above sea level with an average pres-

sure of 1020 Mb).

With an increase in altitude, the pressure goes down considerably and the sensor

may have difficulties taking readings, which has an effect on the vacuum percentage

shown on the display. It isn’t the functionality of the machine that changes, the pump

is not affected in any way, and the actual pressure reached in the room is, at such a

time of operation, the same as or even less than what it was when the machine was

manufactured.

However, the following problem occurs: despite the fact that the room has reached the

vacuum required, the display continues to indicate a lower vacuum, and therefore the pump

continues to run uninterrupted.

In order to recalibrate the sensor to the new pressure situation of the machine’s in-

stallation location, different from the altitude and pressure of under which the ma-

chine was manufactured, a simple sensor calibration program has therefore comes

with the machine.

To calibrate, enter the programming menu: when the machine is powered up and

turned off, you should hold down the ON/OFF button (button 1) for 5 seconds. Move

on using the MENU button (button 5) until you get to: VACUUM CALLIBRATION,

choose “yes” with the arrows (buttons 3-4), confirm with the MENU button (button 5)

and follow the instructions indicated on the display (closing the chamber).

Once the machine’s calibration cycle is complete, the machine is ready to work un-

der the best conditions. If you lose power or the calibration procedure is necessarily

interrupted, we recommend repeating the steps described.

All of the machines with firmware release W8VD1A V4.1 and subsequent versions

can be updated with this V4.4 release.