Liquid Controls IT300N-BBL - Manual (Page 4)

3
THEORY OF OPERATION
Flow Rate Indication =
Input Frequency
FAC x FAC mul
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
Flow rate equation: Flow total equation:
Flow Total =
Sum of Input Pulses
FAC x FAC mul
10 Point Linearization Option:
A 10 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 flow rate and total are then computed based upon the
K-Factor for that measurement sample.
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 is utilized, the power wiring to the loop should always be to terminals (+) 12 and (-)
11. Accidental wiring to (+) 12 and (-)6 should be avoided since excessive current flow may result.
Caution: The magnetic pickup input and contact closure input require isolated sensors for proper operation.
Accidental connections to earth may result in erroneous operation of the analog output and/or excessive
current flow.
Caution: Accidental connections from circuit common (3 or 6) to earth or terminal (11) may result in erroneous
operation of the analog output and/or excessive current flow.
WIRING
TYPICAL APPLICATIONS
Flowmeter with
Switch Closure Output
4-20mA (+)/DC In (+) 12
4-20mA (-) 11
Opto Input (+) 10
Opto Input (-) 9
Opto Out (+) 8
Opto Out (-) 7
1 Mag Input 1
2 Mag Input 2
3 Shield/GND
4 Reset Input
5 Contact Input
6 Common/ DC In (-)
654321
CONTACT INPUT / PULSE OUTPUT / BATTERY POWERED
KAL1B
Totalizer
123456
4 1
7
8
9
10
11
12
Turbine Meter with
Mag Pickup
1 Mag Input 1
2 Mag Input 2
3 Shield/GND
4 Reset Input
5 Contact Input
6 Common/ DC In (-)
654321
MAG INPUT / 4-20mA LOOP POWERED
4-20mA (+)/DC In (+) 12
4-20mA (-) 11
Opto Input (+) 10
Opto Input (-) 9
Opto Out (+) 8
Opto Out (-) 7
7
8
9
10
11
12
Strip Chart
Recorder
+ - 24 VDC
Power
Supply
+ -
KEP
115-24
Remote
Reset Switch
1 Mag Input 1
2 Mag Input 2
3 Shield/GND
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
4-20mA (+)/DC In (+) 12
4-20mA (-) 11
Opto Input (+) 10
Opto Input (-) 9
Opto Out (+) 8
Opto Out (-) 7
7
8
9
10
11
12
BATPACK PLUGIN
CONNECTOR BATPACK
Remote
Reset Switch
12 VDC
Power
Supply
+
-
1 Mag Input 1
2 Mag Input 2
3 Shield
4 Reset Input
5 Contact Input
6 VDC In (–)
Turbine Meter with
Mag Pickup
6 5 4 3 2 1
MAG INPUT / DC POWERED
(without 4-20mA Loop Option)
VDC In (+) 12
Do Not Use 11
Opto Input (+) 10
Opto Input (-) 9
Opto Out (+) 8
Opto Out (-) 7
7
8
9
10
11
12
Power
Supply
or
Ext. Battery