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
Sponsler, Inc.
IT275N Remote Totalizer & Rate Indicator
pg. 6 DOC#: MN-275N-A
CALIBRATION
Sensitivity
The sensitivity adjust R1 is located on the IT275I ( I nput and Analog) PCB. The amplitude of the signal
generated by the turbine is proportional to the r ate of flow; therefore, se nsit ivity should be adjusted at
the lowest usable flow rate. Rotate R1 completely counterclockwise then slowly rotate R1 clockwise until
the display correctly responds then increase R1 slightly clockwise. The nominal R1 position is with the
arrow indicating 11 o’clock.
FIGURE 2
Calibration Factor
The calibration factor is derived fr om the turbine’s K-Factor (Pulses per gallon or ot her desired
engineering unit).
C.F. = Engineering Units
K-Factor
The calibration factor is used for total and rate; the desired engineer ing unit for totalization is also the
engineering unit for displayed rate per minut e. 2 different engineering unit s for total and rate is not
possible.
Example 1: K-Factor = 250 pulses per gallon
Engineering Units = gallons
∴ C.F. = 1/250 = .004000
On the IT275I PCB:
Set S3 #3 ‘ON’ (↓ Position) for ÷ 100 (m oves decimal point r ig ht 2 places)
Formula 1
Sponsler, Inc.
IT275N Remote Totalizer & Rate Indicator
pg. 7 DOC#: MN-275N-A
500 x 60 x .4000
30,000 x .400
12000
100
100
100
On the IT275F PCB
Set S5@4, S6, 7, 8@0 (.4000)
Set S4 in ‘0’ position (0.4000)
The electrical accuracy can be verified by injecting a stable frequency @ TB2-1,2 on the Mounting PCB
and incorporating the following formula:
Total = F x T x C .F.
D
Where F = Frequency in Hz (Frequency = K-Factor X Flowrate)
60
T = Time (Duration) of test in seconds
C.F. = Calibration Factor as entered in S4-S8
D = Divider as entered in S3
Example 2: F = 500 Hz T = 1 minute (60 sec) C.F. = . 4000
Formula 2
Total Displayed =
Rate Indicator will display 120 continuously.
FIGURE 3
=
=
= 120 in 1 minute
Calibration ‘0-1’ Function
The ‘0-1’ function provides enhanced accuracy when totalization encompasses a large q uant it y for an
extended period of time such as SCF produced in a 24-hour period.
The ‘0-1’ function should be incorporated only when both conditions listed below are met:
1) C.F.’s 1
2) C.F.’s 5
ST
digit right of decimal is 1
th
digit right of decimal is not 0
Sponsler, Inc.
IT275N Remote Totalizer & Rate Indicator
pg. 8 DOC#: MN-275N-A
Formula 3
Example 3: Assume a turbine has a K-Factor of 79. 58 pulses per SCF and t he customer product
demand is 520,000 SCF a day
C.F. = 1/79.58 = .0125659 = .12566 ÷ 10 Note: Both conditions are met
Without t he ‘0-1’ function: S3 #2 ‘ON’ (↓ Position) for ÷ 10 (moves decimal right 1 place)
S5@1, S6@2, S7@5, S8@7 (.1257 rounding 4
S4 in ‘0’ Position (0.1257)
A usage of 520,000 SCF = 41,381,600 tot al pulses ( 520, 000 x 79.58) and using the C.F.
of S4-S8 the displayed quantity is 520,166 SCF ( 41,381,600 x .1256
10
rather than 520,000 for a difference of 166 SCF.
With the ‘0-1’ function: Set S3 #3 ‘ON’ (↓ Position) for ÷ 100 (moves decimal right 2 places)
Set S5@2, S6@5, S7@6, S8@6 (.2566)
Set S4 in ‘1’ Position (1.2566)
As stated above the 24 hr usage is 520,000 SCF. The displayed quantit y is now 520,001
SCF
( 41,381,600 x 1.2567 ) for a diff erence of 1 SCF
100
Change of Calibration Engineering Units
Assume that liters rather than gallons are the desired engineering units.
Example 4: K-Factor = 250 pulses per gallon
Liters = 3.785 per gallon
C.F. = Units per Gallon
Pulses per Gallon
C.F. = 3.785/250 = .01514 for display of lit ers
On the IT275I PCB:
Set S3 #2 ‘ON’ (↓ Position) moves decimal point right 1 place
On the IT275F P.C.B:
Set S5@1, S6@5, S7@1, S8@4 (.1514)
Set S4 in ‘0’ Position (0.1514)
Note: The ‘0-1’ function was not incorporated because only 1 of the 2 conditions was met
C.F.’s 1
Example 5: The Engineering Unit is pounds in 10
st
digit right of decimal is 1
th
s CO2
K-Factor = 250 pulses per gallon
Pounds of CO
In order to establish 10
= 8.470 per gallon
2
th
s, increase lbs./gal. by a fact or of 10
th
digit)
)
Sponsler, Inc.
IT275N Remote Totalizer & Rate Indicator
pg. 9 DOC#: MN-275N-A
Actual Quantity
Displayed Quantity
C.F. = 84.7/250 = .3388
On the IT275I PCB:
Set S3 #1 ‘ON’ (↓ Position) does not move decimal point
On the IT275F PCB:
Set S5@3, S6@3, S7@8, S8@8 (.3388)
Set S4 in ‘0’ Position (0.3388)
Note: If the gallons per unit volume such as 7.48 gallons per FT
gallon as required to calculate calibration f act or; take the reciprocal of gallons per unit
volume to derive the unit volume per gallon; i.e. 7.48 gallons per FT
3
FT
per gallon
Example 6: The engineering unit is ACF (FT
3
)
K-Factor = 250 pulses per gallon
ACF = .13369 per gallon
C.F. = .13369 / 250 = .00053476
On the IT275I PCB:
Set S3 #4 ‘ON’ (↓ Position) moves decimal point right 3 places
On the IT275F PCB:
Set S5@5, S3@3, S7@4, S8@8 (.5348 rounding the 4
Set S4 in ‘0’ Position (0.5348)
Example 7: Desired Engineering Unit is ACF x 10
K-Factor = 250 pulses per gallon
ACF = .13369 per gallon
In order to establish x 10, decrease ACF/gal by a factor of 10
C.F. = .013369 / 250 = .00005348
On the IT275I PCB:
Set S3 #5 ‘ON’ (↓ Position) moves decimal point right 4 places
On the IT275F PCB:
Set S5@5, S6@3, S7@4, S8@8 (.5348 rounding the 4
Set S4 in ‘0’ Position (0.5348)
Field Correction of Calibration Factor
To adjust the calibration factor to reflect the tur bine’s act ual resp onse t o the operating conditions,
incorporate the following formula:
Formula 4
New C.F =
x Present C.F.
3
is known, but not the unit volume per
3
1/7.48 = .13369
th
digit)
th
digit)
Sponsler, Inc.
IT275N Remote Totalizer & Rate Indicator
pg.
10
DOC#: MN-275N-A
Example #8: Actual = 50
Displayed = 52
C.F. = .4000
New C.F. = 50/52 x .4000
= .9615 x .4000
= .3846
On the IT275N PCB:
Set S5@3, S6@8, S7@4, S8@6
In the above example, .9615 denotes that the meter is oper at ing 4% fast. Multiplying by the present
C.F. (.4000) by the Actual: Displayed Ratio (.9615) effectively reduces the error by decreasing the C.F.
by 4%.
Example #9: Actual = 52
Displayed = 50
C.F. = .4000
New C.F. = 52/50 x .4000
= 1.04 x .4000
= .4160
On the Factoring PCB:
Set S5@4, S6@1, S7@6, S8@0
In the previous example, 1.04 denotes that the met er is oper at ing 4% slow. Multiplying the present C.F.
(.4000) by the Actual: Displayed Ratio (1.04) effectively reduces the error by increasing the C.F. 4%.
4-20mA Analog Output
The IT275N provides a 4-20mA loop control that is proportional to the flow rate. The f r equency-current
converter output is intended to control a 4-20m A loop, but will transmit a 4-20mA signal into a load if an
external excitation voltage is provided.
The IT275N requires 5.6V of the loops total voltage; therefore, if a 250 ohm sense or load resistor is
incorporated the minimum loop or excitation voltage must be 10.6V, 5.6V + (.02 x 250). The maximum
loop or excitation is 57.6V, 56.6V + (.004 x 250).
Minimum Loop Voltage = 5.6 + (.02 x R) Maximum Loop Voltage = 56.6 + (.004 x R)
All adjustments for the 4-20mA output are located on the IT275I PCB (Refer to FIGURE 2). The f ull-
scale frequency is selected by F/S range select S2, ‘0’ = 100 – 1000 Hz, ‘1’ = 1000 – 2500 Hz F/S
Frequency. To calibrate the 4-20mA output adjust ‘Zero’ (R12) for 4mA @ 0 Hz and ‘Span’ (R14) for
20mA @ the full-scale frequency. The zero and span adjustments are independent.
Sponsler, Inc.
IT275N Remote Totalizer & Rate Indicator
pg.
11
DOC#: MN-275N-A
Typical Output Configuration –
Although the IT275N will function in all configurat ions ca ut ion m ust be exercised when incorporat ing
configurations C and D because the IT275N ground assumes the potential developed across the sense
or load resistance and must be considered when an external signal source such as a frequency
generator is used for calibrat ion. A ‘cheat er ’ plug m ay be required to allow all test equipment to float
and assume IT275 ground potential.
FUNCTION SELECTION
Reset Function
Reset is incorporated to set the TO TAL Display to 00000000.
Reset is initiated externally by placing a magnet in the proximity of reset S9 located on t he Di sp la y PCB
and indicated on the enclosure label as ‘RESET’.
FIGURE 4
Sponsler, Inc.
IT275N Remote Totalizer & Rate Indicator
pg.
12
DOC#: MN-275N-A
MISCELLANEOUS
Battery Replacement
The battery is located on the Mounting PCB and inserts into 2 sock et s. When installing t he bat t ery, it is
imperative to OBSERVE POLARI TY. Simply pull the 3-board stack (See FIGURE #5) out of the
enclosure, install the battery and reinsert the boar d stack. The display will be all zeros.
FIGURE 5
The previous figure illustrates the r emoval of the 3-board stack from the condulet. Note that the
mounting board is not removed.
CAUTION: Do not use the LCD’s or S9 as grip points to remove the board stack.
To Remove: Place a flat head screwdriver under the edge of the IT275D board and lift up gently until
the board stack is far enough out of the condulet to gr ab hold of the outer edge of the t op boar d.
To put the 3 board stack back in the condulet, align as illustrated and push down.
Sponsler, Inc.
IT275N Remote Totalizer & Rate Indicator
pg.
13
DOC#: MN-275N-A
Dimensional Information
FIGURE 6
Sponsler, Inc.
IT275N Remote Totalizer & Rate Indicator
pg.
14
DOC#: MN-275N-A
Sponsler, Inc.
IT275N Remote Totalizer & Rate Indicator
pg.
15
DOC#: MN-275N-A
©2009
Pub. No. MN-275N-A
(09/09)
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