Co/Co Measurement - TESTO 645 Instruction Manual

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The 0632.1240 probe measures concentrations from
0 to 1 vol % CO 2 . The unit can be switched between ppm and
vol% as described in "Parameter settings" on page 16.
The measuring principle is based on infrared absorption. The
probe has a relatively high power consumption on account of its
sensor. Use mains unit and rechargeable batteries for long-term
measurements.
Note: The correct reading is available 20 to 30 seconds after
being switched on.
The corresponding "Count Down" is displayed.
If there are major changes in the concentration, the probe needs
30 - 60 seconds to adapt itself to the outside world.
Gently swinging of the probe shortens the adaptation time.
Hold the probe as far away as possible from you to reduce
the influence of the CO
Pressure offset
Please note that the CO2 reading depends on absolute air pres-
sure. This effect is compensated in the instrument.
Enter the correct absolute pressure for the location in the
"Instrument configuration" menu (see Chapter 6).
Permissible ambient temperature:
Permissible storage temperature:
30
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