Instruction Manual Dräger MSI EM2 EM200plus-i
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8.3.3 Start of flow measurement
The measurement of gas velocity is done with a pitot tube by
measuring the differential pressure between total pressure and
static pressure. To do this, the tubes outlet of total pressure
has to be connected with the + pressure inlet and the outlet of
the static pressure with the – pressure inlet of the MSI
EM200plus-i.
Displayed are the active flow, the result of the last measurement, the calculated average
value of the temporary stored measurements and the number of all temporary stored meas-
urements. With
(ZERO)
the active flow may be set to zero (zero point adjustment). With
(MEASURE)
the active flow will be temporary stored and the value is shown as last. The num-
ber of the temporary stored measurements will increase.
With
(READY)
the result of the flow measurement will be
displayed.
With
(CONTINUE)
the documentation menu will be called.
9 Ambient air CO measurement
In some countries (e.g. Spain) exists a regulation, to measure
ambient air CO at the site of a combustion to prove their
tightness. For this the MSI EM200plus needs no external
sensor. At a place with fresh air, without CO content, the value
has to be 0 ppm. Is the reading not 0 ppm, pull the hose off of
the gas inlet of the gas conditioner and wait for a while.
Push (
ZERO)
. The displayed value will become zero, this zero
point is independent from the CO zero point of normal flue gas
measurements.
Slip the hose on the gas inlet again!
After pushing
(CONTINUE)
the display reads the actual CO value
of the ambient air.
