Liquid Controls IT275N User Manual
INSTALLATION & OPERATION
MANUAL
IT275N REV. A
Remote Totalizer & Rate Indicator
DOC#: MN-275N-A.doc
Sponsler, Inc.
IT275N Remote Totalizer & Rate Indicator
pg. 2 DOC#: MN-275N-A
PAGE #
SPECIFICATIONS ....................................................................................................................... 3
INTRODUCTION ......................................................................................................................... 4
General ................................................................................................................................ 4
Theory of Operation ............................................................................................................. 4
Calibration ............................................................................................................................ 4
INSTALLATION ........................................................................................................................... 5
Inspection ............................................................................................................................. 5
Physical ................................................................................................................................ 5
Electrical ............................................................................................................................... 5
Signal ................................................................................................................................... 5
CALIBRATION ............................................................................................................................ 6
Sensitivity ............................................................................................................................. 6
Calibration Factor .............................................................................................................. 6,7
'0-1' Function ..................................................................................................................... 7,8
Change of Calibration Engineering Units ........................................................................... 8,9
Field Correction of Calibration Factor .............................................................................. 9,10
4-20 mA Analog Output ................................................................................................. 10,11
FUNCTION SELECTION ........................................................................................................... 11
Reset Function ................................................................................................................... 11
MISCELLANEOUS .................................................................................................................... 12
Battery Replacement .......................................................................................................... 12
LIST OF ILLUSTRATIONS
Figure 1 - Mounting PCB ...................................................................................................... 5
Figure 2 - Input & Analog PCB .............................................................................................. 6
Figure 3 - Factoring PCB ...................................................................................................... 7
Figure 4 - Resetting the Display .......................................................................................... 11
Figure 5 - Board Stack Removal ......................................................................................... 12
Figure 6 - Dimensional Informat ion ..................................................................................... 13
TABLE OF CONTENTS
Sponsler, Inc.
IT275N Remote Totalizer & Rate Indicator
pg. 3 DOC#: MN-275N-A
TEMPERATURE:
Internal AA Lithium Battery
Frequency 0-2500 Hz
DISPLAY:
Totalizer: LCD, 8 Digit .3” character s
4-20mA Control Loop
Mounts directly on flowmeter
Weight @ 2. 5 lbs.
SPECIFICATIONS
INPUT VOLTAGE:
INPUT SIGNAL:
Operating -40 to 85°C
Storage –65 to 125°C
Battery Operating Life – 2 years assum ing 24 hr. operation
Battery Shelf Life – 10 years
Amplitude 20 mV – 28V Sine or Squarewave
Sensitivity field adjustable
Impedance 10K
Rate Indicator: LCD, 6 Digit, .35” ch ar acters
Leading Zero Blanking on Rate Indicator
Input Factoring .00000001 – 1.9999 allows totalization and rate in any
engineering unit
OUTPUT:
ACCURACY:
FEATURES:
ENCLOSURE:
5-56V Loop Voltage
4-20mA Representation Proportional to flow
Independent Zero & Span adjustments
Loop Control Circuitry consumes no power from loop
Totalizer +/- 1 count
Rate Indicator +/- 1%
4-20mA output .3% F/S
Totalizer externally reset
FM Approved, C.S.A. Certified
Class I, Groups B,C,D
Class II, Groups E,F,G
Nema 4
Sponsler, Inc.
IT275N Remote Totalizer & Rate Indicator
pg. 4 DOC#: MN-275N-A
INTRODUCTION
General
The Model IT275N Industrial Remote Totalizer & Rate Indicator is a bat t ery powered device that
provides flow totalization & rate in any engineering unit. Total is displayed via an 8-digit liquid crystal
display; Rate via a 6-digit liquid crystal display. The Totalizer Reset function is accom plished externally
by a magnetic field. This particular feature retains the unit’s integr it y permit t ing complete operational
control in hazardous environments.
Negatives previously associated with LCD’s – poor cold temperature perfor m ance s, co ndensation which
is a byproduct of heaters and display ghosting have all been eradicated by incorporating a low
temperature coefficient LCD (-35
temperature specs of –40 t o 125
In addition the IT275N provides 1 analog interf ace out put. The 4-20mA loop control extracts no power
from the loop.
Theory of Operation
The IT275N amplifies and shapes the incoming pulses generated by the turbine's response to flow. The
amplified pulse train is then factor ed and divided to produce a t ot alized display in the desired
engineering unit. In the rate cir cu it , t he divided pulse train is factored by a phase locked loop (PLL) and
combined with a timebase circuit for absolute accuracy. This configuration permits t he calibration factor
to be universal for the total and rate displays.
Calibration
Field calibration is accomplished by incorporating a calibration factor base d on t he turbine's K-Factor.
The calibration factor range is .00000001 – 1.9999. The calibration factor is entered via 4 BCD
switches, a divider switch and a ‘0-1’ switch for the total and rate funct ions.
Calibration of the 4-20mA loop control is established by a F/S Frequency selector switch in conjunction
with the zero and span adjustments. 4-20mA calibration is independent of the calibration factor enter ed
for total & rate display units.
(SPONSLER, INC. STRONGLY RECOMMENDS THOROUGH REVIEW AND UNDERSTANDING OF
THIS MANUAL PRIOR TO INSTALLATION)
o
C). All monolithic and discrete devices of the IT275N have
o
C.
Sponsler, Inc.
IT275N Remote Totalizer & Rate Indicator
pg. 5 DOC#: MN-275N-A
INSTALLATION
Inspection
All units are completely assembled, inspected and tested at the factory prior to shipment. Upon receipt
of the unit, a visual inspection should be conducted to detect any impropriety or damage that may have
occurred during shipment. Report any discrepancy to t he factory immediately.
Physical
The IT275N Remote Totalizer & Rate Indicator is m et er mounted and should be positioned as practically
as possible taking into account display visibility, accessibility, etc. The IT 275N enclosur e is r at ed Class I
Groups B,C,D; Class II Groups E,F,G; and Class III Nema 4 and will withstand the harshest
environment.
Electrical
The IT275N Remote Totalizer & Rate Indicator is designed to operate with a single internal AA battery
and requires no external wiring for power. Wiring of the analog output can be accomplished in a couple
of different m et hods t o fit the application. For the analog output, shielded cable is not required.
Signal
A 2 wire twisted pair with molex and tinned terminations is standard. Pin orientation of t he m olex
connector or the tinned terminations is negligible.
FIGURE 1
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