TESTO 350 Maritime V2, Инструкция по эксплуатации

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6 Using the product
62
(21 Vol.%) the next time the instrument is switched off/on or when
another zeroing process is carried out. The same applies when a
measuring program passes through a zeroing phase. The O
2
test
gas must also be applied to the measurement gas inlet (as with the
toxic sensors).
If obviously unrealistic readings are displayed, the sensors
should be checked (calibrated) and, if required, adjusted.
The calibration/adjustment can be carried out by the user or
by a qualified service centre approved by Testo.
To ensure that specific accuracies are retained, Testo
recommends testing every six months and recalibration
when required.
Adjustments made with low gas concentrations can lead to
accuracy deviations in the upper measuring ranges.
The sensor protection (shut-down function) is not
deactivated. The test gas concentration should therefore be
lower than the set thresholds for the sensor protection.
The function of
to dilute all (x5) is automatically
deactivated.
If the instrument is fitted with an CxHy sensor, it should be
switched off before test gas is applied.
If a CxHy-Sensor is fitted, switch this off before measuring
test gases with O
2
contents <2%. If you forget to do this,
the sensor will switch off automatically during the
measuring process, but will still be strained unnecessarily.
The following boundary conditions must be met when calibrating /
adjusting:
• Use absorption-free hose material.
• Select
Testgas as fuel
• Switch on the flue gas analyser at least 20 minutes before
calibration / adjustment (to warm up)
• Use clean air for gas zeroing
• Maximum overpressure of the test gas 30hPa (recommended:
pressureless via bypass)
• Apply the test gas for at least 3 minutes
Recommended test gas concentrations and compositions can be
found in the Test Gas Manual (Order-No. 0981 2313) or in the
Download Centre.
Calling up the function:
Make sure that the ambient air us free of interfering gases
(e.g. CO, NO, etc.) during zeroing!