Type / N.
Rev.
Data
Page
Total pages
EW095.605
5
November 2010
8
96
EsiWelma
s.r.l.
ppm
% VOL
LEL % (methane gas)
1.000.000
100
impossible combustion
100.000
10
100
Lower Explosive Limit
40
10.000
1
20
10
5
1.000
0,1
100
0,01
10
0,001
1
0,0001
Fig. 1.1
2
DESCRIPTION OF SYSTEM
The system (called EW40) is formed of a control unit UCE40... and field devices that
communicate by means of a shared line (BUS) and a dedicated master protocol (PEW40).
Therefore, this solution is suitable for central applications when a dedicated gas detection
control system is required. Each control unit has its own default identification code. The
following field devices are available:
•
UR.40..: gas detectors for application in hazardous and/or non hazardous areas
•
MAR40: relay modules for energising and/or local alerts
•
MDD40: display modules for distributed monitoring of the system
•
MID40: alarm modules for acquiring digital input from the field
NOTE: the words "detector" and "sensor" are used without distinction throughout this document
and have the same meaning, except where this may create ambiguity.
The system structure is shown in Fig. 2.1.
Possible combustion
range
Limit value range of
gas detectors
Содержание Sensigas EW40
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