TELEDYNE OLDHAM SIMTRONICS Everywhereyoulook BM 25A, User Manual

Page: 23 / 72

BM 25A/AW
AREA GAS MONITOR
USER MANUAL
NPB25AEN
Revision D.0
15
3.4 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.
3.4.1 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 25A/AW
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 25A/AW equipped with an electric pump)
BM 25A/AW with electric pump is not CSA certified.
Before each use of the electrical pump, check the seal by obstructing the end of the
sampling line until the Flow Fault alarm is triggered. Do not forget to remove the
sensors cover to return to diffusion mode.