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9.4
OXYMAT 7 / ULTRAMAT 7: Introduction of reference gas
9.4.1
Selection of the reference gas
9.4.1.1
OXYMAT 7
Note
Composition of the reference gas
Using an unsuitable reference gas can cause the reference gas throttle (capillary tube) to be
closed. The device is then no longer capable of measuring.
Therefore, use dust-free reference gas or a standard dust filter with a mean pore width of <5 µm
in the reference gas inlet.
Overview
Table 9-1
Overview of the reference gases
Measuring range
0 to vol. % O
2
to 100 Vol. % O
(suppressed zero
2
point with full-scale value
100 Vol. % O
)
2
0 ≤ 21 ≤ 100% O
(suppressed zero
2
with 21 Vol. % O
within the span)
2
Reference gas "Air"
Air only has a constant O
For measurements with measuring ranges of 2 %, the exact O
"Air" must be known. Use this value as the setpoint for a zero point calibration.
Selection of the reference gas
The various measuring spans must have at least one common value. This value is then defined
as the "physical zero point" and applies to all the measuring ranges. The reference gas can be
selected on the basis of the "physical zero point".
Wall-mounted device
Operating Instructions, 07/2023, A5E31930403-AB
9.4 OXYMAT 7 / ULTRAMAT 7: Introduction of reference gas
Recommended
Reference gas connection pres‐
reference gas
sure range
N
2 000 to 4 000 hPa above sample
2
gas pressure
O
2
(max. 5 000 hPa absolute)
Air
100 - 150 hPa with respect to
sample gas pressure
share if the humidity is constant. Therefore use dry air.
2
Commissioning
Comment
The reference gas flow is set au‐
tomatically to between
5 and 12 ml/min.
The sample gas pressure may fluc‐
tuate by max. 50 hPa around the
ambient pressure
share of the reference gas
2
127
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