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Manual abstract: user guide HONEYWELL SWLDATASHEET
Detailed instructions for use are in the User's Guide.
[. . . ] 26 I
Flow monitors Air flow monitoring
SWL series
Sensor for air ducts, evaluation unit for enclosed mounting
ble ed ca shield 2 00 m m ax. 1 3 x 1. 5 m m
The combination of air flow sensor SLF 3 and evaluation unit ASL 453 is suitable for air flow monitoring in air-conditioning, ventilation and cooling installations and in any situation where
flow processes must be detected in air or neutral gases. [. . . ] As heat is withdrawn by the flowing air, the thermistor resistance alters. As the resistance also depends on the temperature of the medium, the difference must be determined by a second thermistor. The difference is compensated and in this way the switching point is kept stable. Suspended materials adhering to the sensor can have an insulating effect and so affect the measurement result and hence the defined switching point. Therefore it is advisable to remove any dirt during routine maintenance operations.
Switch-on bypass While the plant is being started up (still no airflow present), the output contact is activated and the flow condition signaled. The time for the switch-on bypass is adjustable from 2-60 s. The start-up or switch-on bypass starts when the unit is switched on. If an external start button (normally closed contact) is connected (to the Z-Z terminals), the start-up bypass begins when the (locking) button is pressed. Product Summary Supply voltage Sensor Evaluation unit 230 VAC 24 V AC/DC Type SLF 3 ASL 453 ASL 453/24
Technical data of evaluation unit
Power supply 230 VAC or 24 VAC/DC (see Product Summary) Power consumption approx. 3 VA Contact load Relay, single pole 8 A, max. 250 VAC Ambient temperature 0 60°C Flow rate Adjustable from 0. 1 to 20 m/s for gaseous media Response time approx. 1 s Repetition accuracy <2%, relative to the flow rate directly on the sensor. [. . . ] 18 kOhm The terminal voltage of evaluation units ASW454 or ASW 454/24 can also be checked with a voltmeter between the "a2" and "a3" terminals after disconnecting the sensor. 31. 4 VDC is the correct value.
with locking button Adjusting elements s = sensitivity = time for switch-on bypass t (high sensitivity at low flow) Signal lamps 1 = Flow present or switch-on bypass active = supply voltage present 2
s
Degree of protection: IP 32 (sensor) IP 65 (evaluation unit) [. . . ]
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