DE-OX® SUN Helium
analyzer Draft Issue n. 1.1 of 10/02/11
page
5
mixed gas flow, gives an electrical signal. This signal is transmitted to the central unit and processed in order to give
the helium percentage information on the display. The mixed gas flow that comes in contact with the sensor, must
range from 0,5 to 1 litres/min (best 0,5 lit/min) at the same calibration pressure (typically ambient pressure 1 bar) and
temperature (Typically 20°C) or a wrong gas analysis will occur (preferably use a flow regulator with meter connected
to the mixed gas tank). Higher flow value or pressure or temperature variations, will cause wrong analysis and will
irreparably damage the sensor. During the gas analysis, the unit must be kept steady and must not be shaken or
submitted to vibrations. Allow gas freely flows into the pipes.
During gas analysis, the helium percentage of the mixed gas being analyzed is available on the display. It is possible
to make several gas analysis without waiting the instrument goes to 0 reading.
It is possible to let
DE-OX® SUN
in ambient for ambient analysis of helium. In this case the reading will be slower (up
to 5 minutes).
Warning
When battery is nearly exhausted BAT appears on the display. In this case helium analysis is not anymore
reliable.
Warning
Breathing mixed gas with helium needs the right training. NOOA and medical studies recommend not to
expose to an oxygen partial pressure higher than 1.6 bar or lower than 0.18 bar because of serious personal
injury including death. Refer to proper medical literature and receive the right training.
Replacement of the Battery and of the Helium Sensor
DE-OX® SUN
requires one 9 Volt transistor alkaline battery. It must be replaced when “bat” appears on the display.
To replace the battery:
- Switch off
DE-OX® SUN
.
- Remove the three closing screws and carefully open the
instrument.
- Remove the old battery and replace it with the new one.
- Do not throw anyway the old battery. Check the correct recycling
procedure.
- Close the instrument screwing the three closing screws.
- Switch on the instrument with the On/Off key and check the battery
level.
Warning
Don’t leave battery inside the instrument if you do not use it for
a long time.
The helium sensor must be replaced when unable to correctly read
helium concentration. The sensor life is over 24 months or more
under normal operating conditions. Always contact
TEMC
®
for
replacing the sensor.
Warning
Replace the helium sensor when the unit is unable to correctly analyze the gas. The use of an exhausted
sensors may cause dangerous analysis and lead to death. Wrong helium analysis may lead to death. Always
contact
TEMC
®
for sensor replacement. Do not use any other helium sensor brand.
To replace the helium sensor:
- Switch off
DE-OX® SUN
with the On/Off key.
- Remove the three closing screws and carefully open the instrument.
- Unplug the sensor connector.
- Remove the old sensor screwing un-clockwise the flow adapter and replace it with the new one.
- Connect again the plug to the sensor connector. Screw again the flow adapter.
