11
8.
Sensors
The FreVAX™ device is equipped with several sensors to guarantee an optimal vaccination result.
8.1.
Position Sensor
This sensor allows for continuous control of the correct holding
position of the device. Once the trigger has been pushed, before
allowing liquid to be drawn into the device the position sensor will
check if it is held upright in order to avoid drawing in air. If the device
is held in the correct angle, which is indicated by the small circle being
inside the big circle, liquid from the attached bottle will be drawn in.
Once the device is fully loaded with liquid, the holding position is no
longer relevant until the trigger is activated again.
Please note: When using the tubing adapter to deliver vaccine, no position sensor reading is needed
because there is no bottle mounted on top of the device. In this case, the position sensor can be
disabled (
user menu
settings
position sensor
off
).
8.2.
Air Detection Sensor
This sensor measures whether fluid or air is drawn into the device. If
air is drawn in, e.g. by emptying the bottle and not fitting a new one
in time, a warning “Air detected” is shown. Afterwards, only rinsing is
possible, indicated by blue flashing LED bars, until the air exits at the
injection head. This takes a minimum of 3 rinsing cycles, as the liquid
circuit has a volume of a little less than 6 ml and one rinsing cycle
moves a volume of 2 ml. After the rinsing process, you will be able to
vaccinate again (indicated by white flashing LED bars).
8.3.
Nozzle Sensor
This sensor enables an extra safety precaution when using the injector. Once the FreVAX™ device is
ready for vaccination (white flashing LED bars), push and hold the trigger. When the device is applied
to the skin of the piglet, the safety sleeve around the injection head will slide back, releasing the
vaccine. If either the trigger is not pushed or the safety sleeve around the injection head does not
slide back, no vaccine will be released. This allows for a high level of user safety.
Furthermore, the nozzle sensor measures if the minimum contact
time between device and piglet
for administration of the full dose
is
fulfilled. If the injector is released too early, implicating an underdose,
the device will give an optical warning via red flashing LED bars and a
written notification on the display.
9.
Vaccination Process
Press the trigger to load the device. The position sensor indicates
the position of the bottle in the holder of the FreVAX™.
Summary of Contents for FreVAX 101
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