Vega ASI-4 Operating Manual
Page 11
11 Installation
Connect a pitot tube to the “pressure port” and if required connect the static port. Most small aircraft such as ultralights or
microlights do not require a connection to a static port. In these cases, simply leave the static port open. Ensure however
that the static port does not receive pressurized air due to the forward movement of the aircraft. Be especially critical of
your pod or panel if you do not use a static port. Any build up of a pressure differential due to ram air or suction can lead
to large errors of the indicated airspeed. Static ports are usually mounted at a strategic position on the rear side of the
aircraft fuselage for faster, pressurized aircraft.
Suitable connection hose for both pitot tube and static port can be obtained from a hardware store or even a pet shop.
Good quality tubing is often used for fish tanks and it has just the right diameter.
Please note that this kind of tubing is not advised for pressurized aircraft. In this case you would need to obtain aircraft
grade tubing of suitable diameter. You would also have to use hose clamps to fasten the hose onto the ASI-4 pitot and
static ports. The ASI-4 allows you to calibrate the airspeed reading. This is done under the “AIRSPEED SETUP” menu
item. The main reason for this is to be able to remove errors introduced due to the airflow around your aircraft which may
have an effect on your pitot tube pressure.
11.1 General Connection Diagram
The use of an external 1A fuse is recommended. Connect the supply terminals to your aircrafts power supply. The ASI-4
can be used on both 12V and 24V without the use of any pre-regulators. Ensure that the supply voltage will not drop
below 8V during operation as this may result in incorrect readings.
