Campbell Manufacturing LIQUID LEVEL DB1 Manual De Usuario

DB1 Liquid Level Measurement Sensor

Case 3

PortSet(3,1)

'Open valve to atmosphere

EndSelect

Delay(0,150,MSEC)

Sum = 0

For j = 1 To 25

'Take 25 pressure readings for each tube and atmosphere

BrFull(mV, 1, mV25,4, VX1, 1, 2500, true, true, 0, _60Hz, 1, 0)

Sum

Next j

Valve(i)=

Sum/25 'Average the 25 readings from upper and lower tube and atmosphere

PortSet(1,0)

'Close valve to lower tube

PortSet(2,0)

'Close Valve to upper tube

PortSet(3,0)

'Close Valve to atmosphere

Next i

Delta_mV = Valve(2) - Valve(1)

Mult

Delta_H/Delta_mV

Offset = (Valve(3) * Mult)

WtrLvl = Valve(2)* Mult – Offset 'units of WtrLvl are same units as Delta_H (a constant)

CallTable

Table1

NextScan

EndProg

5.2 CR10(X) Example

Input Location Usage:

LOCATION LABEL

#1:

Liquid Level

#4:

Multiplier

#5: Offset
#6: mv/V
#7: Sum
#8:

Avg. Level

#9: mV/V#1
#10:

mV/V#2

#11:

mV/V#3

#12:

Delta V

#13:

Delta h

* Table 1 Programs
01: 60

Sec. Execution Interval

1: Do (P86)
1: 2

Call Subroutine 2

2: Do (P86)
1: 42

Set high Port 2