58
8024252/AE00/V1-0/2020-07| SICK
O P E R A T I N G I N S T R U C T I O N S | ZIRKOR200 Ex-D
Subject to change without notice
8
MAINTENANCE
Fig. 31: Control unit main fuses
8.6.2
Test air and reference air volumes
The systems are always preset at the factory to the correct test air or reference air volumes.
The instrument air versions are designed for an inlet pressure of 1...10 bar, it may be
necessary to readjust the reference air volume or test air volume when the inlet pressure is
higher than 6 bar.
The air volume should be within the following ranges:
Test air
:
150 l/h - 180 l/h
Reference air
: 30 l/h - 40 l/h
8.6.3
Setting the flow volume (Safe Area control unit)
On systems with integrated pneumatics, it is possible to set the reference or test air volume
on the electronics. A distinction is made here between the pump and instrument air
version:
●
The
pump version
uses ambient air. Only the test air volume can be set for the pump
version.
●
The
instrument air version
requires an external supply of clean, dry and oil-free air
(instrument air) directly at the installation site. Here both the reference and test air
volumes must be set.
