Environnement MP101M User Manual

Environnement S.A MP101M Duplication prohibited
SEPTEMBER 2013
2–8
2.3. ACQUISITION AND PROCESSING OF MEASUREMENT PARAMETERS
The temperature and pressure sensor outputs are transmitted via an analog multiplexer with 16 input
channels to the D/A converter on the Module board (4) in figure 1–7. The signals are converted into
digital signals and sent to the microprocessor.
The microprocessor processes acquisition data, carries out calculations, automatisms, interfaces
control.
The microprocessor receives the digital signal corresponding to count of the (G.M.) detection tube.
2.4. ORGANIZATION OF MEASUREMENTS
The measurements are organized into scan periods and cycles. A scan period is the time between two
intermediate weightings performed during a cycle.
Two types of measurement results are thus generated: periodic and/or cyclic.
a) Cyclic
This type of measurement provides better precision. The cycle duration is selected to obtain maximum
density of dust deposited on the filter (this depends on the utilization site).
b) Periodic
This type of measurement is less precise than a cyclic measurement. The periodic measurement is
used to analyze the density of the dust while it is being deposited in order to monitor a rapidly evolving
pollution event.
When operating with both cycle and period, both types of measurements are expressed. This
operating mode is preferable since, unlike operation with the "short" cycle, a substantial amount of
filter ribbon will be saved since the ribbon is only normally fed forward at the start of the cycle.
Period 1 (PC
1
)
Period n (PC
n
)
Period 2 (PC
2
)
C
n
N
0
SV
1
N
2
N
1
SV
2
SV
n
N
n
-1
N
n
C
1
C
2
C
n
-1
time
Cycle
Last period
N
C
SV
L

  

  

  

00 0 0
12
12
n n
n-1
n
n-1
(-2N for first period), Sampling time=Period duration-N N=counting time
NN N N
11 1 1
N =count, C = Ln ,C = Ln , C = Ln , C = Ln
kN kN kN kN
PC=Periodic concentration, SV=Periodic





112
12
12
0
C
n
n-1
n
n
C-C
CC-C
sampled volume, PC = , PC = , PC =
SV SV SV
N
1
Ln
k
N
Cycle concentration=CC=
SV
Figure 2-4 - Organisation of measurements

Environnement MP101M Specifications

General

Brand	Environnement
Model	MP101M
Category	Monitor
Language	English