WATER LEVEL LOGGER

Water Level Logger

Description

The Water Level Logger is a microprocessor controlled unit for automatically recording the water level at preprogrammed intervals. The equipment consists of a cylindrical probe which has a transducer incorporated into its base and a robust waterproof control unit which is connected to the probe. The probe is positioned in the water and the system measures the height of the water above the transducer. The probe has been redesigned so that it now has a smooth end and, if required, can be used directly in the ground without a dip well. The control box contains the display unit with the water level meter, logger and battery box. To increase the units flexibility the logger is detachable from the control box to enable it to be replaced in the field. The logger is setup and the data retrieved via an RS232 lead that is connected to an IBM PC or compatible. The logger is programmed with a text string, used to identify the logger, the logging time interval and automatically with the current date and time. When the data is retrieved, the text string, time and date of each reading and water height are obtained. The data is displayed graphically, and maximum and minimum values are shown. The data can be changed into various formats for exporting to spreadsheets etc. for further analyses.

Specifications

General
	Water table height range:	0 to 1 metre (or as required)
	Accuracy:	<0.5% (normal operating conditions)
	Battery life:	> 1 year
Logger
	Resolution:	4 mm (255 steps)
	Information stored:	Water depth Time and date of reading Identifying text
	Data retention:	Indefinite, even when battery is removed
	Logging Interval	1 second to 10 days
	Logging period:	Up to 2 years
	Software	IBM PC or compatible, File output compatible with spreadsheet formats (e.g. Excel) Graphical and statistical output
Dimensions
	Transducer tube:	35 mm (diam.) x 1230 mm (or as required)
	Control box:	180 mm x 180 mm x 140 mm
Displays
	Water height display:	LCD display, gives depth in mm (activated by read switch) Battery check LED
	Logger indicator:	Flashes every 4 secs. when logging in progress
Controls
	Read switch:	Activates water height display and battery check
Batteries
	Display box	10 AA Alkaline batteries
	Logger	1/2 AA Lithium battery
Connectors
	The probe and logger are connected to the display unit with a waterproof connector. The logger lead connects the logger to the serial port on the PC.
Downloading
	If required the logger can be downloaded in the field with a portable PC or Palm hand held computer. As an option the logger section can be disconnected for remote downloading and replaced with another logger .