962-5DA0-032 datasheet(3/12 Pages) MAGNETROL

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A D V A N C E D

S E L F - T E S T

A N D

D I A G N O S T I C S

Ultrasonic switches are often used as the

last

means

detecting

whether

process vessel will overflow and cause a

spill of potentially hazardous liquids, or

empty

out

and

possibly

cavitate

the

pumps. In these critical applications it is

desirable to have a method of periodically testing the

ultrasonic switch to ensure that it is functioning properly.

Model 961/962 switches feature an advanced self-test

technology that not only tests the electronics, transducer,

and piezoelectric crystals, but also tests for the presence

of industrial sources of environmental noise. Should the

switch detect any problems a malfunction output is gen-

erated to alarm the user, and a red LED is lit to indicate

an alarm condition.

Self-test is performed automatically and continuously sev-

eral times per second to verify proper operation of

961/962 switches. In addition, a pushbutton is provided to

initiate a manual self-test mode. Pressing this test button

stops all transmit pulses, which simulates an electronics

failure. This failure is reported as:

• 3.6 or 22 mA (selectable) with current shift output units

• SPDT malfunction relay de-energizes with relay

output units

Taking diagnostics one step further is the unique noise

self-test mode feature that is standard in all 961/962

switches. This tests for electromagnetic and acoustical

noise that can influence many instrumentation technolo-

gies. If high levels of environmental noise are detected,

the electronics reports a fault condition to alert the user

of potential instrumentation reliability concerns.

A microprocessor in the 961/962 electronics continuously

monitors all self-test data. Should a fault occur, the micro-

processor can determine whether the malfunction is due

to the electronics, transducer, piezoelectric crystals, or the

presence of environmental noise. A pushbutton and Fault

LED is used to assist in troubleshooting the switch:

5 One flash of the Fault LED indicates a problem

with the transducer or piezoelectric crystals

55 Two flashes of the Fault LED indicates a

problem with one of the electronics boards

555 Three flashes of the Fault LED indicates

excessive levels of environmental noise

Transd

ucer

& cryst

als

Electro

nics

Noise

A D J U S T A B L E

T I M E

D E L A Y

Turbulence

and

splashing

can

cause

some fixed time response switches to

produce

false

level

alarms.

Model

961/962 switches overcome this difficulty

with an adjustable time delay feature.

A potentiometer allows a

1⁄2 to 45 second delay to be set

to disregard waves or splashes, and reliably detect the

true liquid level.

R E L I A B L E

T R A N S D U C E R

D E S I G N

Dependable

point

level

measurement

begins with reliable sensor design. Over

30 years of ultrasonic level switch tech-

nology experience is behind the Model

961/962 single and dual gap transducers.

The result is an extremely robust trans-

ducer design that offers superior perform-

ance in difficult process conditions.

Model 961 single point has a tip-sensitive transducer with

an arch-shaped gap for superior performance in aerated

or foamy liquids. Dual point Model 962 features a tip sen-

sitive lower gap and flow through upper gap. This robust

design allows separations of 125 inches (318 cm) between

the upper and lower transducer gaps.

962-5DA0-032 Datasheet(PDF) 3 Page - Magnetrol International, Inc.

962-5DA0-032 Datasheet(HTML) 3 Page - Magnetrol International, Inc.

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