|WORLD METEOROLOGICAL ORGANIZATION||
|Explanation of the criteria for classification and numbering of components||
|Explanation of the dates on the component's description|
DIGITAL WATER LEVEL METER
1. Purpose and objectives
A water level
sensor developed for use in observation stations with telemeters
and drainage pump stations. It can be connected directly
with wireless equipment and data processors. It further allows
simultaneous measurement and digital recording/printing.
Reed switches at 1 cm intervals are turned on and off by a magnet in a float. This provides a series of electrical signals for the output. This 1 cm accuracy can be guaranteed irrespective of the total measurement range.
level meter can function fully automatically as a system for
water level measurement and recording.
is water level BCD signals delivered to telemeter equipment etc.
Digital recording and printing allows recording and printing at a
given time step. In case a pre-set alarm water level is exceeded,
data is recorded at a shorter time interval, and an asterisk is
printed in front of the corresponding values.
5. Operational requirements and restrictions
civil engineering works necessary for the construction of the
facilities to install this unit, the number of professional
level personnel for its installation, operation and maintenance
is of at least
In case of recording the data measured at the site, it is necessary to replace the paper tape periodically (about every 6 months: paper tape is required for 6 months use with max. one hour printing per day). When battery is used as the only power source, it is also necessary to replace it for a charged battery periodically.
Ambient temperature is -10 to +50 °C for the sensor, but a heater should be applied to prevent freezing. It is -10 to +40 °C for the coder, with humidity below 90 %, though no condensing is allowed.
There are 6
different ranges (per water level meter) of water
level measurable: 0 to 1 m, 0 to 1.5 m, 0 to 2.0 m, 0 to 2.5 m, 0
to 3.0 m and 0 to 3.5 m. Subject to measurement range,
combination use is done.
6. Form of presentation
and specifications of the instrument and home page are available
7. Operational experience
in more than 2500 places may answer for the reliability of this
water level meter, which has been in use since 1967. Several
units have been exported to Philippines and Indonesia.
8. Originator and technical support
10. Conditions on use
The hardware is for sale.
|(First entered: 1 FEB 93||
Last updated: 21 APR 00)