background image

Using the CS400/CS405 Submersible Pressure Transducer with Campbell Scientific Dataloggers

6

Factory calibration: Each CS400/CS405 transducer is shipped with a
calibration report specific to that unit.  The report specifies calibration
conditions and actual data reflecting the transducer's static accuracy and
thermal characteristics.  Newer calibration reports from KPSI include a slope
figure near the bottom of the page that may make the following calculations
unnecessary. 

Short Cut users may need to divide the KPSI calibration slope
figure by 2.3065 to obtain PSI/mV for use in the Short Cut
CS400/CS405 setup screen.

The following is an example from a five psi CS400 calibration report:

Test

BFSL

(BFSL = Best Fit Straight Line)

Pressure

Room Temperature

PSIG

Outputs

0.0001

0.01

1.0002

4.30

1.9997

8.59

2.9996

12.87

3.9996

17.16

5.0006

21.45

To determine a multiplier based on the two calibration end-points:

Multiplier 

(5.006 PSI  -  0.0001 PSI)   2.3065 ft / PSI

21.45 mV  -  0.01 mV

0.5380  ft / mV

=

=

BFSL output at full scale pressure

BFSL output at min. scale pressure

Full scale pressure

Minimum scale pressure

Density factor
(e.g., feet of water/PSI)

A second way to calculate the multiplier is to run a linear regression on the data
from the factory calibration report.  In the regression, the BFSL output in mV
would be the x axis or independent variable and test pressure in PSI the y or
dependent variable.  The slope would equal the multiplier and the intercept
would be the offset.

Field calibration: If you do not have a factory calibration report, a multiplier
can be determined by performing a field calibration.  Wire the transducer and
program the datalogger as described, using a multiplier of 1.0 and an offset of
zero.  Watch the measurement results using Mode *6 on the keyboard/display
or the monitor mode on an attached computer.  Record the CS400/CS405 signal
output at two separate depths.

NOTE

Содержание KPSI Series

Страница 1: ...USING THE CS400 CS405 KPSI SERIES 169 173 SUBMERSIBLE PRESSURE TRANSDUCER WITH CAMPBELL SCIENTIFIC DATALOGGERS INSTRUCTION MANUAL REVISION 11 02 COPYRIGHT c 2000 2002 CAMPBELL SCIENTIFIC INC ...

Страница 2: ...This is a blank page ...

Страница 3: ...eturn policy apply to these items Products may not be returned without prior authorization To obtain an RMA number contact KPSI phone 800 328 3665 NOTE if the product has been exposed to hazardous media it must be fully decontaminated and neutralized prior to return to KPSI ...

Страница 4: ...This is a blank page ...

Страница 5: ...ions 3 3 6 BDR320 3 3 7 BDR301 3 3 8 PST3 8 4 4 Programming 4 4 1 Using Short Cut 5 4 2 Using Edlog or the Keyboard Display 5 4 3 CR10 X CR510 and CR500 Programming 7 4 4 CR23X and 21X Programming 8 4 5 BDR301 320 Programming 9 4 6 PST3 8 Programming 10 5 Maintenance 10 5 1 Every Visit At Least Monthly 10 5 2 Every Three Months 11 5 3 Every Two to Three Years or on a Rotating Schedule 11 6 Trouble...

Страница 6: ...This is a blank page ...

Страница 7: ...tation wire CS400 CS405 transducers are vented so that changes in barometric pressure are compensated for in the measurement The difference between the CS400 and CS405 is specified accuracy The CS400 has an accuracy of 0 25 of the full scale output The CS405 has an accuracy of 0 1 of the full scale output 2 Specifications Static Accuracy 0 25 FSO BFSL CS400 L 0 1 FSO BFSL CS405 L Thermal Error 0 0...

Страница 8: ... incorporated in the cable vents the sensor diaphragm to the atmosphere This eliminates the need to compensate the water level measurement for changes in barometric pressure To prevent water vapor from entering the inner cavity of the sensor the transducers are typically shipped with the vent tubes sealed Before operation visually confirm the vent tube is open The vent tube opening must terminate ...

Страница 9: ...o be replaced 3 4 Temperature Fluctuations Temperature fluctuations can be minimized by using a minimum cable burial depth of six inches and a sensor submersion depth of one foot 3 5 Sensor Connections Datalogger 7977 Resistor E1 Purple CS400 CS405 1H Yellow Black 1L Black Red 2H Green 2L White AG Blue G ground 3 6 BDR320 BDR320 7977 Resistor EX Purple CS400 CS405 CH1 Yellow Black CH2 Black Red CH...

Страница 10: ...e wiring for a CS400 CS405 and a DES 1 which can be connected to the PST3 8 FIGURE 3 2 Wiring diagram for a CS400 CS405 and a DES 1 for use with the PST3 8 4 Programming The example programs below enable the datalogger to collect and process data and store it in input storage locations Additional instructions are needed to output data to final storage For example time periodic output might include...

Страница 11: ...ts 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 Di...

Страница 12: ...5 To determine a multiplier based on the two calibration end points Multiplier 5 006 PSI 0 0001 PSI 2 3065 ft PSI 21 45 mV 0 01 mV 0 5380 ft mV BFSL output at full scale pressure BFSL output at min scale pressure Full scale pressure Minimum scale pressure Density factor e g feet of water PSI A second way to calculate the multiplier is to run a linear regression on the data from the factory calibra...

Страница 13: ... reference point However another reference datum such as elevation is often used Large offsets may result in truncation of less significant digits For example a measurement of 70 0 feet or greater will only show depth to the nearest 0 1 ft using the default low resolution If this is a problem consider performing offset correction after the data is collected or storing the data in high resolution f...

Страница 14: ...F P34 1 4 X Loc HEAD_FT 2 0 0 F NOTE site job specific offset 3 4 Z Loc HEAD_FT 4 4 CR23X and 21X Programming Use an excitation voltage of 1540 mV with a CS400 CS405 rated 20 PSI For a CS400 CS405 rated 20 PSI use 860 mV If the value in MA_MEAS goes to 99999 your particular transducer may require a slightly lower excitation voltage If this is the case decrease the recommended millivolts excitation...

Страница 15: ...an be programmed to measure the CS400 CS405 by prompt programming Select 6 WIR for the measurement type The multiplier must be multiplied by 0 05 for prompt programming the BDR multiplier 0 538 X 0 05 0 0269 for the above calibration Example Input Table Number 01 Measurement Interval Mins 0001 Loc Name Units Type Chn Mult Offset 01 HEAD FT 6WIR 001 0269 0 0000 02 OPT Remember to create an output t...

Страница 16: ... programming might include instructions P84 P70 etc 4 6 PST3 8 Programming The PST3 8 is preprogrammed Please refer to the PST3 8 manual for instructions 5 Maintenance Periodic evaluation of the desiccant is vital for keeping the vent tube dry To assess the effectiveness of the desiccant use one of the following An indicating desiccant that changes color when it s losing its drying power An enclos...

Страница 17: ...damage Check wire connections ensuring they are still secure 5 3 Every Two to Three Years or on a Rotating Schedule Send the transducers to the factory or laboratory for inspection and have them serviced and or replaced as needed 6 Troubleshooting The most common causes of erroneous pressure transducer data include poor sensor connections to the datalogger damaged cables damaged transducers moistu...

Страница 18: ...Using the CS400 CS405 Submersible Pressure Transducer with Campbell Scientific Dataloggers 12 ...

Отзывы: