Using the CS400/CS405 Submersible Pressure Transducer with Campbell Scientific Dataloggers
5
Use Short Cut, Edlog, or the datalogger Keyboard/Display to program the
datalogger to read these sensors. All programming methods require the “slope”
provided on the “Calibration Report.” A Calibration Report should accompany
every sensor received from KPSI. It is specific to the individual sensor; verify
that the Report and the sensor have the same serial number, and retain the
Report for your records.
4.1 Using Short Cut
Short Cut is the easiest and typically the preferred method for programming the
datalogger. Short Cut will ask for the “slope” which is listed on the Calibration
Report. From this value Short Cut will calculate the multiplier.
Short Cut for Windows has two additional modules for calculating the offset.
Choose either the “Manual Offset” or “Automatic Offset” module to adjust the
transducer reading to the current water level reading. Short Cut for DOS asks
for a current water level reading to automatically calculate the offset. Review
Short Cut’s (Windows or DOS) Help for more detail on using the offset.
Older versions of Short Cut for DOS required the transducer’s sensitivity be
entered in the units of mV. Visit Campbell Scientific’s web site
(www.campbellsci.com) or talk to an applications engineer to receive your free
copy of the latest Short Cut release.
Short Cut stores the CS400/405 level data in the high resolution format. Short
Cut also generates a wiring diagram that shows how to connect the transducer
to your datalogger.
The sections that immediately follow are for Edlog and
Keyboard/Display users. Short Cut users can jump ahead to the
Maintenance section (page 10).
4.2 Using Edlog or the Keyboard/Display
Use two sequential Instruction 6s - Full Bridge Measurement. These
Instructions require a multiplier and offset. Your datalogger manual has a
detailed explanation of Instruction 6.
4.2.1 Calculating the Multiplier
Three multipliers are required in a datalogger program for a CS400/CS405.
The multiplier for the first P6 instruction, parameter seven is 0.01, the
multiplicative inverse of 100 (Ohms). The multiplier for the second P6
instruction, parameter seven is 0.5, the factory calibration current in mA.
These first two multipliers are used for all CS400/CS405s.
The third multiplier (used in the P37 instruction, parameter two) is a calibration
multiplier and is specific to each CS400/CS405. Before you begin
programming, determine the third multiplier as outlined below. There are two
different types of calibration; factory (manufacturer’s calibration sheet) and
field (physical recalibration).
NOTE
