Product Description
FLOWSIC100 · Operating Instructions · 8012513/YSA5/V2-1/2016-07 · © SICK Engineering GmbH 41
Subject to change without notice
2.3.7 Cooling air control option for device types M-AC and H-AC
The "Cooling air control for device types M-AC and H-AC" subassembly serves minimizing
the number of temperature drops below the dewpoint on the ultrasonic transducer. The
cooling air blower is switched on or off depending on the transducer temperature. Cooling
therefore only runs for appropriately high gas or transducer temperatures. This prevents
permanent cooling air operation overcooling the probe. Setting the required limit values for
switching the cooling air supply on and off is made in SOPAS ET (
p. 150, 4.3.5).
2.3.8 Optional sets for emergency air supply for device types with purge and cooling air
operation
The optional sets for emergency air supply serve preventing severe damage to transducers
should the purge/cooling air supply fail. The sets are usable as described in the respective
written versions for the FLOWSIC100 measuring system with 1-path configuration, SOPAS
application setting "FLOWSIC100". The emergency air supply systems monitor failures in
supply voltage for the purge air blower. Prerequisite for using the sets for emergency air
supply is the on-site provision of compressed air free from oil and dust.
WARNING:
The emergency air supply systems only provide temporary protection for trans-
ducers against overheating (several hours) and must never be used as alterna-
tives for standard purge/cooling air supply because there is a risk that the
emergency air supply systems create interfering noise on the transducers and
therefore influence measurement. On devices purged externally (FL100 PM,
PH and
PH-S), there is also a risk of the emergency air not keeping transducer surfaces
sufficiently clean.
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