Explanation of the criteria for classification and numbering of components    F00.2.01
(JUN 00)
Explanation of the dates on the component's description



1.   Purpose and objectives

     This Telephone Service Water Gauge utilises telephone circuits to supply water level information on remote dams and rivers using a voice message.

2.   Description

     The system consists of a water level transmitter, a telephone service controller and an ordinary telephone receiver. The system is activated from a remote location by calling its telephone number; callers receive the water level data by means of a voice message.

     -  Water level information is available at any time and any place.

     -  High precision mechanism.

     -  Easy access.

     -  Either an ordinary telephone line or a leased-line can be used.

3.   Input

     Input signals are B.C.D. (Binary Coded Decimal) signals using an analog to digital conversion unit connected to the water level transmitter.

4.   Output

     -  Automatic service for telephone circuits using a voice message.

     -  The system provides the water level using a voice message.

5.   Operational requirements and restrictions

     - Operations personnel should have a basic knowledge of electrical circuitry; a licence is needed for        the telephone installation.

     - A monthly equipment inspection is required.
     - Ambient temperatures 0 - 50°C, humidity 0 - 90% R.H.

6.   Form of presentation

     A catalogue and instrument specifications are available.

7.   Operational experience

     More than 170 sets have been installed in Japan since 1967. Eight sets have been exported.

8.   Originator and technical support

     Makaasa Instruments Co.

9.   Availability

     From the HOMS National Reference Centre for Japan.

10.  Conditions on use

     Instrument for sale.

(First entered: 05 FEB 81

Last updated: 16 JUNE 81)