H59.0.22.6C-06
page 5 of 8
8
Oxygen measuring
-
Switch on instument, calibrate (refer to chapter 9 Calibration)
-> the
current oxygen concentration [%]
will be displayed
-
hold sensor to valve like shown (good
contact necessary, otherwise there
could be measured to low values)
-
Open valve a little, until You can hear
gas flow.
Attention: Do not open to far!
-
When measurement display is stable,
press
-key:
hld
(Hold = measurement is held) and
oxygen concentration [%]
are displayed alternating
-
pressing
again:
The Maximum Operating Depth (
MOD
) is displayed alternating to
hld
(
n
is the symbol for display in meters,
F
for feet)
-
pressing
again: return to current oxygen concentration display
The oxygen measurement
depends on air pressure
. The current pressure can be entered
during configuration.
If you
measure at atmosphere
and the calibration took place at the same conditions, the
pressure value has not to be adjusted necessarily, because the same pressure is used for
calibration and measuring.
(If the measurement is carried out at
other pressure conditions
than the calibration: The
actual pressure has to be entered in the configuration for measurement and calibration. )
The sensor’s
temperature dependency
is compensated internally. However for best results
try to keep the same temperature both during calibration and measuring.
Temperature differences between sensor and gas
may cause additional errors!
Therefore wait an appropriate period of time until the sensor has adjusted its temperature to
the gas that is measured. A suitable flow of the gas around the sensor increases the
adjustment significantly.
Try to avoid warming of the sensor by touching it during measurement or calibration.
When
measuring bottled gas
, consider that the gas coming out is cooler than the ambient
because of the pressure loss! Strong air flows can produce an over pressure at the sensor
–
possible source of measuring/calibration errors!
The nominal life time can be shortened by:
-
Wrong storage / operation temperature
-
Permanent use with dry gases (compressed gas).
It helps to put the sensor to normal-
humid ambient air in measuring breaks (“flush”
system with fresh air).
The
optimum operation position
is: with the sensor inlet pointing downwards
