AUTOCAL
Time left 01:44 min
Purging w. CAL gas
73c
The analyzer initially carries out an AUTOCAL during the warm-
up phase. The ow of AUTOCAL gas (nitrogen or air) is displayed
in the bottom line, and the remaining time is shown in the line
above this. This AUTOCAL cannot be interrupted.
AUTOCAL
Time left 01:44 min
Purging w. meas.gas
73d
Following the calibration, the analyzer switches to purging with
sample gas. After the purging phase is complete, the analyzer
switches to measuring mode and remains in the warm-up phase
for about 30 minutes. For analyzers with installed UV module,
there is a constant check during the warm-up phase to deter‐
mine whether the UV module has reached its setpoint temper‐
ature. As soon as this is the case, there is a waiting period of
55 minutes. Once this time has expired, an additional AUTOCAL
is automatically conducted by the analyzer. The warm-up phase
is then nished and the full measuring accuracy has been
reached.
7.4.2 Measuring mode
74
403.8 vpm CO |
1875 vpm NO
|
936.4 vpm SO2 |
4.4 % O2 | P
The measured components are output on the display together
with their values and the units in mg/m
3
, vpm or volume percent.
With a change in the analyzer status, the corresponding letter
appears in the last two columns ("P" in the example; see
also Display and control panel (Page 89)). The analyzer remains
in measuring mode until an AUTOCAL (automatic, remote-con‐
trolled or manual) is carried out or until you manually switch the
analyzer to input mode.
If analyzers are installed in closed analysis cabinets, opening the
cabinet door may result in brief drifting of the measured values.
This is a result of the temperature exchange which then takes
place.
74a
***** vpm CO |
1875 vpm NO
|
936.4 vpm SO2 |
4.4 % O2 | P
If '*****" is displayed in measuring mode without a fault being
present, this means:
• Concentration in sample gas more than 5% higher than the
largest measuring range
• Signal saturation resulting from excessively high sample gas
concentrations
Operation
7.4 Operating modes
ULTRAMAT 23
94 Equipment Manual, 04/2022, A5E37100388-012
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