42 FLOWSIC100 · Operating Instructions · 8012513/YSA5/V2-1/2016-07 · © SICK Engineering GmbH
Product Description
Subject to change without notice
2.3.8.1 Emergency air supply for device types M-AC and H-AC
Prerequisites:
1 Compressed air free from oil, dust and water provided by the customer.
2 Compressed air requirement about 9…11 m3/h
3 Primary pressure at least 1.5 bar (measurable with emergency air in operation).
Cooling function during normal device operation (
p. 87, 3.3.4.1)
In normal operation, cooling air for sender/receiver units is supplied via the MCU blower
unit or, optionally, via a blower unit in a separate enclosure (
p. 180, Fig. 147).
Air path in normal operation (cooling air supply via MCU blower unit):
- Air entry in the MCU suction opening - air filter - blower unit - flexible DN25 hoses -
backflow valve - cooling air inlet S/R unit - cooling air discharges from S/R unit (after
deflection in probe tube).
The "backflow valve" is open in forward direction (rubber poppet valve).
Cooling function in emergency operation (cooling air failure due to interruption or
failure of the voltage supply to the cooling air blower)
An installed solenoid valve releases a flow of compressed air should the standard cooling
air fail. If the compressed air flow is pressurized, the emergency air valve (
p. 87, Fig. 57)
with integrated backflow valve closes in the blocking direction and the compressed air
flows into the cooling channels of both S/R units (
p. 87, Fig. 57).
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