Campbell AVW1, Инструкция по эксплуатации

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4-1
SECTION 4. THE AVW1
4.1 GENERAL
The AVW1 contains circuitry needed to
interface Geokon's 4500 series vibrating wire
sensor to the CR10. The AVW1 is designed to
interface one vibrating wire sensor (temperature
and pressure) to two single ended CR10
channels. The AVW1 has no quiescent current
drain. The current drain during the very short
(2.4 ms) temperature measurement is .4 mA or
lower. The current drain during the vibrating
wire measurement (170 ms to 500 ms) is 32
mA. The AVW1 is 2.5 inches long by 2.5
inches wide by 1.4 inches high. The silk
screening for the AVW1 is shown below.
FIGURE 4.1-1. The AVW1
4.2 SENSOR HOOK UP
FIGURE 4.2-1. Hook up to AVW1
4.3 WELL MONITORING EXAMPLE
In this example the vibrating wire sensor is used
to monitor the Distance from the lip of the well
to the water surface in a 150 foot well. The
water level is expected to stay within 40 to 80
feet of the lip so the 50 psi pressure sensor is
placed approximately 100 feet below the lip of
the well. The same sensor used in Section 3.2
for the computation of the multiplier etc. (serial
number 3998) will be used again in this
example.
In the example program that follows the depth
of water above the vibrating wire sensor is
measured in psi and then converted into feet of