Hydrological Services Pty Ltd
Data Logger Model ML1-420
©
Copyright
ML1-420 100-16
Issue 1.00 6 Apr, 2011
transducer powered for 7 secs before measuring. Transducer
will be powered at 00:00, 00:15, 00:30, 00:45, 01:00, 01:15,….
The “Transducer Range” (
TXR
) is a parameter that defines the 20mA transducer depth. Zero
depth is usually represented by 4mA and maximum depth is represented by 20mA. This
parameter is determined by the particular transducer connected to the ML1-420.
TXR<CR>
Displays the present Transducer Range.
TXR=10.000<CR>
Set the 20mA depth to 10.000m
TXR=1.000<CR>
Set the 20mA depth to 1.000m
The “Type 4-20mA” (
TYPE4
) is a 16 character user defined string that allows the Status
Window to be customised for your measurement application. It simply changes the aesthetics
of the Status Window. The MiniLog may be used for measuring River Level, Dam Level,
etc…. It is best to start this parameter with a capital letter – for aesthetic reasons.
TYPE4<CR>
Display
the
MiniLog
Type
TYPE4=River<CR>
Set the logger to River
TYPE4=Dam<CR>
Set the logger to Dam.
The “Units 4-20mA” (
U420
) parameter is a user defined 8 character string that assists in
defining what is being measured. For example it may be mm or inches or litre/hr or widgets.
This parameter is so the logged data has meaning.
U420<CR>
Display
the
present
units.
U420=m<CR>
Set the units to m.
The “Water Level” (
WL
) command initiates an analog measurement of the 4-20mA
transducer and displays the result to 3 decimal places. The message “Please Wait…” will
appear while the transducer is warming up prior to the actual measurement.
WL<CR>
Please Wait…
12.981
The Water Level value displayed is created as follows :
Water Level (WL) = (((Measured 4-20mA)-4)/16) x Range (TXR) + Offset (RVHR)
The result displayed when a WL command is performed is also logged into memory with the
time.
