User manual HONEYWELL SWW DATASHEET

[. . . ] 24 I Flow monitors SWW series For monitoring flow of liquid and piped, gaseous media 60 m 2 max. mm x 1. 5 able 4 ed c shield The flow in fluids can be monitored reliably with flow sensors SWF 62 and SWF 62 L and evaluation unit ASW 454. The sensitivity can be adjusted accurately with a rough and fine potentiometer. [. . . ] As heat is withdrawn by the flowing medium, the thermistor resistance alters.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. When monitoring high flow rates, rapid temperature fluctuations can trigger switching operations. 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. Product Summary Sensors Screw-in thread G 1/4 G 1/2 Sensor length (from thread) 25 mm 45 mm Thread length 23 mm 18 mm Type SWF 62 SWF 62 L 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 Max. Flow rate 0. 1. . . 3 m/s (liquid media) 1. . . 15 m/s (gaseous media) Response time approx. 20 ­ 60 s Repetition accuracy < 2%, relative to the flow rate at the sensor. [. . . ] 1. 0 kOhm The terminal voltage of the evaluation units ASW454 or ASW 454/24 can also be checked with a voltmeter between the "+" and "Gnd" terminals after disconnecting the sensor. 14. 8 VDC is the correct value. Adjusting elements Sensitivity (rough and fine) (high sensitivity at low flow) Signal lamps 1 = Flow present 2 = Supply voltage present s Degree of protection: IP 65 (sensor) IP 32 (evaluation unit) [. . . ]