940-123M-004 datasheet(2/4 Pages) MAGNETROL

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:

⁄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

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