4.3.5.2.2
Entry/exit monitoring
Overview
When using entry/exit monitoring, materials can be transported both out of a haz‐
ardous area and into a hazardous area without interrupting the work process. As soon
as something other than material enters the hazardous area, the work process is inter‐
rupted.
Arrangement of the muting sensors
The muting sensors must be arranged so that the entire lengths of both the material
and the means of transport are detected by the sensors or the ESPE. There may not be
any detectable gaps, otherwise muting is ended too soon (reduced system availability).
NOTE
Prevent mutual sensor interference.
Functionality
The muting sensors are arranged in series on the left and right of the ESPE and detect
the material before it passes through the ESPE (
"
). The material can be transported
either into the hazardous area (
!
) or out of the hazardous area.
A1
L
1
!
L
3
A2
B1
B2
"
L
2
Figure 15: Entry/exit monitoring
!
ESPE
"
Hazardous area
Table 8: Conditions for entry/exit monitoring
Condition
Description
A1 & A2 (or B1 & B2)
Two muting sensors of a muting sensor pair
are activated to start muting. The first muting
sensor pair is activated according to the direc‐
tion in which the material is being transported.
A1 & A2 & B1 & B2
All four muting sensors are activated briefly to
accept the muting condition.
B1 & B2 (or A1 & A2)
Muting applies for as long as this condition
remains fulfilled. The second muting sensor
pair is activated according to the direction in
which the material is being transported.
4
PROJECT PLANNING
28
O P E R A T I N G I N S T R U C T I O N S | deTem4 LT Muting A/P
8024802/2020-07-17 | SICK
Subject to change without notice