Campbell KPSI Series, Инструкция по эксплуатации

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1
Using the CS400/CS405 (KPSI Series
169/173) Submersible Pressure
Transducer with Campbell Scientific
Dataloggers
1. General Information
The CS400/CS405 (KPSI-PSI Series 169/173) submersible pressure transducer
measures water levels in environmental and industrial applications. As the
water depth changes over the transducer, so does the pressure. The
CS400/CS405 contains a strain gauge element which senses the pressure and
produces a corresponding mV analog output when an excitation current is
provided. The datalogger measures the signal differentially and scales it to the
excitation current. This current is detected by the datalogger by measuring the
voltage drop across a 100-Ohm precision resistor such as Campbell Scientific’s
part #7977 in series with the black excitation 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** 0.022% FSO/
°
C worst case
Proof Pressure 1.5 X rated pressure
Burst Pressure 2.0 X rated pressure
Resolution Infinitesimal
*Static accuracy includes the combined errors due to nonlinearity, hysteresis
and nonrepeatability on a Best Fit Straight Line (BFSL) basis, at 25
°
C.
**Thermal error is the maximum allowable deviation from the Best Fit Straight
Line due to a change in temperature.
Comp. temp. range 0 ° C to 27 ° C
Operating temp. range -10
°
C to 70
°
C
Excitation 0.5 mA constant current
Zero offset, max 10 mV
Bridge impedance 3500 ohms nominal
Insulation resistance 100 megohms at 50 VDC