Campbell Scientific CS445 Liquid Level Sensor - Manual (Page 8)

CS445 Liquid Level Sensor
4
waking the sensor and issuing the aM! command. The transducer responds to
the logger indicating that one measurement will be ready within two (2)
seconds. Subsequent communications handle data reporting from the sensor to
the datalogger.
Sensor Address
The CS445 is shipped from the factory with a preset SDI-12 address of 0. This
can be changed using the SDI-12 command ‘aAb!’ and the suggested method is
to use the SDI-12 Transparent Mode in a logger. See Appendix A for details
on Transparent Mode.
5.1 Using ShortCut
ShortCut is the easiest and typically the preferred method for programming the
datalogger. ShortCut generates a wiring diagram that shows how to connect
the pressure transducer to your datalogger.
The sections that immediately follow are for CRBasic, Edlog and
Keyboard/Display users. ShortCut users can jump ahead to the
Maintenance section (page 6).
5.2 Using CRBasic
In the CR200 Series dataloggers, Instruction SDI12Recorder is used to read
SDI-12 Sensors. A multiplier of 1.0 and an offset of 0.0 yields water level in
units of pounds per square inch (psi). For units of feet use a multiplier of 2.31
and an offset of 0.0.
The SDI12Recorder instruction has the following form:
SDI12Recorder(Destination, Output String, Multiplier, Offset)
Wiring for example program
Red Battery +
Black G
Brown C1/SDI-12
Clear G
Sample Program for CR200 Series Datalogger
'CR200 Series
'Declare the variable for the water level measurement
Public Level
'Define a data table for 60 minute maximum and minimums
DataTable(Hourly,True,-1)
DataInterval(0,60,Min)
Maximum(1,Level,0,0)
Minimum(1,Level,0,0)
EndTable
‘Read sensor(s) every 60 seconds
NOTE