Campbell CR510 Manuel de l'opérateur télécharger pdf (Page 236)

TD ADDENDUM—SECTION 8. PROCESSING AND PROGRAM CONTROL EXAMPLES

AD-8-8

Time into Test, min Output Interval Loop #

00 to 10 10 sec. 1

10 to 30 30 sec. 2

30 to 100 1 min. 3

100 to 300 2 min. 4

300 to 1000 5 min. 5

1000 and greater 10 min. 6

This is accomplished with a series of loops

(

Instruction 87), where the delay and count

parameters are used to implement the

frequency of measurement (and output) and the

duration of the that frequency. The unit of delay

is the execution interval. A delay of 1 with a 10

second execution interval and a count of 60

means the instructions in the loop, in this case

measure and output water level, are executed

every 10 seconds for 10 minutes.

The drawdown portion of the test is completed

at s

ome time greater than 1000 minutes. To

enter the recharge phase of the test, the

operator enters the *6AD Mode and sets Flag 1

high. At the next 10 minute pass through loop 6

the loop is exited. Program execution returns to

the top of the program table and the

measurement schedule starts over again for the

recharge test.

The sensor is a 50 PSI Druck, model 930/ti with

a c

alibration of 49.93 mV/10V of excitation or

4.993mV/V. Your calibration will be different.

An excitation voltage of 1500 mV yields a

maximum signal of 7.489 mV at 50 PSI, fully

utilizing the 7.5 mV Input Range to provide the

best resolution.

The multiplier, m, is calculated to provide depth

of

water in feet:

m = (50 psi/4.993 mV/V) * (2.3067 ft/psi)

m = 23.099 ft/mV/V

The offset is calculated to provide a final value

that r

epresents the distance from the lip of the

well to the water surface. Similar to Figure

7.16-2, the offset equals the initial distance of

47.23 feet plus the initial reading of 54.77, or

102 feet.

* 1 Table 1 Programs

01: 10 Sec. Execution Interval

User must toggle Flag 1 to start measurements

01: P91 If Flag/Port

01: 21 Do if flag 1 is low

02: 0 Go to end of Program Table

Loop 1, Output every 10 seconds for 10

minutes

02: P87 Beginning of Loop

01: 1 Delay

02: 60 Loop Count

03: P86 Do

01: 1 Call Subroutine 1

04: P95 End

Loop2, Output every 30 seconds for 20 minutes

05: P87 Beginning of Loop

01: 3 Delay

02: 40 Loop Count

06: P86 Do

01: 1 Call Subroutine 1

07: P95 End

Loop 3, Output every 1 minute for 70 minutes

08: P87 Beginning of Loop

01: 6 Delay

02: 70 Loop Count

09: P86 Do

01: 1 Call Subroutine 1

10: P95 End

Loop 4, Output every 2 minutes for 200 minutes

11: P87 Beginning of Loop

01: 12 Delay

02: 100 Loop Count

12: P86 Do

01: 1 Call Subroutine 1

13: P95 End

Loop 5, Output every 5 minutes for 700 minutes

14: P87 Beginning of Loop

01: 30 Delay

02: 140 Loop Count

15: P86 Do

01: 1 Call Subroutine 1

16: P95 End

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