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940-111E-001 Datasheet(PDF) 2 Page - Magnetrol International, Inc. |
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940-111E-001 Datasheet(HTML) 2 Page - Magnetrol International, Inc. |
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2 / 4 page  Ultrasonic transducer Customer provided conduit Transmit crystal Receive crystal Figure 1 Ultrasonic signal transmission across transducer gap T E C H N O L O G Y Ultrasonic energy detects the presence or absence of liquid in a tip sensitive transducer gap. The principle behind contact ultra- sonic technology is that high frequency sound waves are easily transmitted across a transducer gap in the presence of liquid, but are attenuated when the gap is dry. The transducer uses a pair of piezoelectric crystals that are encapsulated in epoxy at the tip of the transducer. The crystals are made of a ceramic material that vibrates at a given frequency when subjected to an applied voltage. The transmit crystal con- verts the applied voltage from the electronics into an ultrasonic signal. When liquid is present in the gap, the receive crystal is able to sense the ultrasonic signal from the transmit crystal and convert it back to an electrical signal. This signal is sent to the electronics to indicate the presence of liquid in the transducer gap. When there is no liquid present, the ultrasonic signal is attenuated and is not detected by the receive crystal. S P E C I F I C A T I O N S Electrical: Power Supply: 12–35 VDC Power Consumption: Less than 1 Watt Signal Output: Model 940: SPDT relay, 1 amp @ 30 VDC, 0.5 amp @ 125 VDC, 0.5 amp @ 150 VAC Model 941: Dry Gap: 8 mA (±1 mA), Wet Gap: 16 mA (±1 mA) Cabling: 18" (457 mm) flying leads of 18 AWG wires Repeatability: 0.078" (2 millimeters) Response Time: 1 ⁄2 second typical Environmental: Ambient Temperature: -40° to +185° F (-40° to +85° C) Process Temperature: -40° to +185° F (-40° to +85° C) Maximum Pressure: 2000 psig (138 bar) for 1" (3 cm) and 2" (5 cm) transducers 1500 psig (103 bar) for transducers longer than 2" (5 cm) Shock ANSI/ISA-S71.03 Class SA1 Vibration ANSI/ISA-S71.03 Class VC2 These units have been tested to EN 50081-2 and EN 50082-2 and are in compliance with the EMC Directive 89/336/EEC. A G E N C Y A P P R O V A L S AGENCY APPROVED MODELS PROTECTION METHOD AREA CLASSIFICATION FM & CSA 94X-XXXX-XXX Non-Incendive Class I, Div. 2,Groups A,B,C, & D Class II, Div. 2, Groups E,F, & G Class III, Type 4X, IP 66, T4 941-XXXX-XXX Intrinsically Safe Class I, Div. 1,Groups A,B,C, & D Class II, Div. 1, Groups E,F, & G Class III, Type 4X, IP 66, T4 2 |
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