Aspirated mode (with pump option)
Remote sensing is possible with the internal electric pump option, or by using a hand
aspirator.
Sampling probes (rigid, semi-rigid or telescopic) and sampling tubing are
not antistatic. The user must take the necessary precautions to avoid
electrostatic discharges. In all cases, the user must prevent dangerous
electrostatic discharges using a metallic probe.
Warning (Hand Aspirator): The BM 25 series is designed to be used with a
built-in pump for remote sampling. A hand aspirator can be used for
indicative sampling, but it must be noted that when using a hand aspirator,
a reading error in the region of + 20% is possible. In addition, whereas the
pump can sample quickly and accurately with up to 30 meters of sample
line, the hand aspirator must only be used with up to 10 meters of sample
line and the sample time is extended. The sample line must be intact and
the proper flow established.
Using an electric pump
■ The internal pump is powered by the gas monitor's battery and starts automatically
when the sensors cover is applied (Figure 15: positioning the sensors cover (BM
25/25W equipped with an electric pump)ref. 1); this cover can be identified by its
hump (ref. 4).
■ Connect the sample line (ref. 2) to the gas inlet (ref. 3).
■ Wait a few seconds before reading the measurements. Any anomaly in the pump
system is indicated by an audible alarm and on the LCD display.
Figure 15: positioning the sensors cover (BM 25/25W equipped with an electric pump)
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