Design, Specifications are subject to change without notice.

Ask factory for technical specifications before purchase and/or use.

Whenever a doubt about safety arises from this product, please inform us immediately for technical consultation without fail.

Ð EF76 Ð

Ultrasonic Ceramic Sensors

Application Notes

Because the Ultrasonic Sensors are designed for

use in the air, they can not be used under the

water or others liquid.

1. Design Engineering Notes

1. Application of DC voltage

DC voltage shall not be applied to the

Ultrasonic Sensors because insulation

resistance may deteriorate.

2. Maximum Input Voltage

The Ultrasonic Sensors shall not be operated

beyond the specified ÒMaximum Input VoltageÓ

in the catalog or the specifications.

3. Characteristics change owing to load

impedance

Center frequency and sensitivity change in

accordance with load impedance.

Therefore, the load characteristics chart shall

be taken into consideration in designing

circuit.

4. In the Design of Transmitting Circuits

It shall be noted that the impedance of the

device is as low as 500 Ω (approximately) at

the resonance frequency.

2. Mounting Notes

1. Installation

It is recommended to hold the Ultrasonic

for absorption of mechanical stresses such as

shock and vibration.

V

Except sulfurated rubber

2. Soldering

Soldering of the lead terminals shall be done

at a position of 2.5 mm or more apart from

bottom plain of the devices.

3. Bending force to the Terminals

Abnormal bending force shall not be applied

to the terminals of the Sensors, otherwise

holding parts of the terminals may be easily

broken, resulting in failures and damages of

the devices.

4. Directivity

Please be cafeful enough in deciding facing

position of the sensor because of directivity.

3. Storage Notes

1. Environmental Conditions

The Ultrasonic Sensors shall not be operated

and/or stored under following environmental

conditions;

a) To be exposed directly to water or salt

water.

b) Under conditions of dew formation or frost.

c) Under conditions of corrosive atomosphere

such as hydrogen sulfide, sulfurous acid,

chlorine and ammonia.

2. Long Term Storage

The Ultrasonic Sensors shall not be stored

under severe conditions of high temperature

and high humidity. Store them indoors under

40 ¡C max. and 75 %RH max. Use them within

one year and check the solderbility before

use.