962-7DA1-135 datasheet(4/36 Pages) MAGNETROL

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51-646 Echotel® Model 961 & 962 Ultrasonic Level Switches

1.0

Introduction

ECHOTEL Model 961 and 962 ultrasonic level switches

utilize pulsed signal technology to detect high, low, or dual

point level in a broad range of liquid media applications.

Model 961 is a single point level switch. Model 962 is a

dual point switch used as a level controller or to control

pumps in an auto-fill or auto-empty mode.

1.1

Principle of Operation

Model 961/962 switches utilize ultrasonic energy to detect

the presence or absence of liquid in a single or dual point

transducer. Ultrasonic contact level technology uses high-

frequency sound waves that are easily transmitted across a

transducer gap (see Figure 1) in the presence of a liquid

media, but are attenuated when the gap is dry. Model

961/962 switches use an ultrasonic frequency of 2 MHz to

perform this liquid level measurement in a wide variety of

process media and application conditions.

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 converts the applied voltage from the elec-

tronics into an ultrasonic signal. When liquid is present in

the gap, the receive crystal senses the ultrasonic signal from

the transmit crystal and converts 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.

2.0

Installation

2.1

Unpacking

Unpack the instrument carefully. Inspect all units for

damage. Report any concealed damage to carrier within

24 hours. Check the contents of the packing slip and

purchase order. Check and record the serial number for

future reference when ordering parts.

serial number

Ultrasonic

transducer

Transmit

crystal

Receive

crystal

Figure 1

Ultrasonic Signal Transmission

Across Transducer Gap

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