Liquid Controls IT300N - Manual (Page 6)

4
THEORY OF OPERATION
Flow rate equation: Flow total equation:
Flow Total T T =
Sum of Input Pulses
FAC
TYPICAL APPLICATIONS
Several typical applications of the IT 300N are shown below. Please observe that the various pulse inputs and power
options may be intermixed in many ways to solve common applications. The isolated pulse output may be freely
used so long as proper polarity is observed.
Caution: When 4-20 mA loop option is provided, the power wiring to the loop power option should always be to
terminals (+) 12 and (-) 11. Accidental wiring to (+) 12 and (-)6 should be avoided since excessive current
fl ow may result with power option "C".
Caution: The magnetic pickup input and contact closure input require isolated sensors for proper operation. Ac-
cidental connections to earth may result in erroneous operation of the analog output and/or excessive
current fl ow with power option "C".
Caution: Accidental connections from circuit common (3 or 6) to earth or terminal (11) may result in erroneous op-
eration of the analog output and/or excessive current fl ow with power option "C".
WIRING
Flow Rate Indication =
Input Frequency
FAC
x Time Scaler
Where Time Scaler is equal to: 1 for rate per second read out
60 for rate per minute read out
3600 for rate per hour read out
86400 for rate per day read out
“D” option Only
20 Point Linearization Option: 20 Point Linearization Option:
A 20 point linearization table is used to construct a curve describing the relationship of K-Factor and input frequency.
The measured input frequency is used to access the table. A linear interpolation of adjacent point pairs is used to
arrive at the K-Factor at that input frequency. The fl ow rate and total are then computed based upon the K-Factor
for that measurement sample.
NOTE: For best performance and resolution choose as many decimal places as possible in the K-Factor.
Example: Enter a K-Factor of 1 as 1.000.
Remote
Reset Switch
12 VDC
Power
Supply
+
-
1 Mag Input 1
2 Mag Input 2
3 Shield/Common
4 Reset Input
5 Contact Input
6 Common/ DC In (-)
Turbine Meter with
Mag Pickup
6
5
4
3
2
1
MAG INPUT / DC POWERED
DC In (+) 12
Not Used (-) 11
Opto Input (+) 10
Opto Input (-) 9
Opto Out (+) 8
Opto Out (-) 7
7
8
9
10
11
12
KEP
115-12
or
Ext. Battery
(Power option A or B)
Flowmeter with
Switch Closure Output DC In (+) 12
Not Used 11
Opto Input (+) 10
Opto Input (-) 9
Opto Out (+) 8
Opto Out (-) 7
1 Mag Input 1
2 Mag Input 2
3 Shield/Common
4 Reset Input
5 Contact Input
6 Common/ DC In (-)
6
5
4
3
2
1
CONTACT INPUT / PULSE OUTPUT / BATTERY POWERED
123456
7
8
9
10
11
12
(Power option A or B)
Remote
Reset Switch
1 Mag Input 1
2 Mag Input 2
3 Shield/Common
4 Reset Input
5 Contact Input
6 Common/ DC In (-)
Turbine Meter with
Mag Pickup
6
5
4
3
2
1
MAG INPUT / BATPACK POWERED
DC In (+) 12
Not Used(-) 11
Opto Input (+) 10
Opto Input (-) 9
Opto Out (+) 8
Opto Out (-) 7
7
8
9
10
11
12
BATPACK PLUGIN
CONNECTOR
BATPACK
(Power option A or B)
(Power option C or AC)
Turbine Meter with
Mag Pickup
1 Mag Input 1
2 Mag Input 2
3 Shield/Common
4 Reset Input
5 Contact Input
6 Common
6
5
4
3
2
1
+ -
Strip Chart
Recorder
MAG INPUT / 4-20 mA LOOP POWERED
4-20mA (+)(+) 12
4-20mA (-) 11
Opto Input (+) 10
Opto Input (-) 9
Opto Out (+) 8
Opto Out (-) 7
7
8
9
10
11
12
24 VDC
Power
Supply
+ -