INSTALLATION & OPERATION MANUAL IT275N REV. A Remote Totalizer & Rate Indicator DOC#: MN-275N-A.
Sponsler, Inc. IT275N Remote Totalizer & Rate Indicator pg. 2 DOC#: MN-275N-A TABLE OF CONTENTS PAGE # SPECIFICATIONS ....................................................................................................................... 3 INTRODUCTION ......................................................................................................................... 4 General ...........................................................................................................................
Sponsler, Inc. IT275N Remote Totalizer & Rate Indicator pg. 3 DOC#: MN-275N-A SPECIFICATIONS TEMPERATURE: Operating -40 to 85°C Storage –65 to 125°C INPUT VOLTAGE: Internal AA Lithium Battery Battery Operating Life – 2 years assuming 24 hr. operation Battery Shelf Life – 10 years INPUT SIGNAL: Frequency 0-2500 Hz Amplitude 20 mV – 28V Sine or Squarewave Sensitivity field adjustable Impedance 10K DISPLAY: Totalizer: LCD, 8 Digit .3” characters Rate Indicator: LCD, 6 Digit, .
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 battery 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 accomplished externally by a magnetic field.
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 the factory immediately.
IT275N Remote Totalizer & Rate Indicator Sponsler, Inc. pg. 6 DOC#: MN-275N-A CALIBRATION Sensitivity The sensitivity adjust R1 is located on the IT275I (Input and Analog) PCB. The amplitude of the signal generated by the turbine is proportional to the rate of flow; therefore, sensitivity 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.
Sponsler, Inc. IT275N Remote Totalizer & Rate Indicator pg. 7 DOC#: MN-275N-A 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 Formula 2 Where F = Frequency in Hz (Frequency = K-Factor X Flowrate) 60 T = Time (Duration) of test in seconds C.F.
IT275N Remote Totalizer & Rate Indicator Sponsler, Inc. Example 3: pg. 8 DOC#: MN-275N-A Assume a turbine has a K-Factor of 79.58 pulses per SCF and the customer product demand is 520,000 SCF a day C.F. = 1/79.58 = .0125659 = .12566 ÷ 10 Note: Both conditions are met Without the ‘0-1’ function: S3 #2 ‘ON’ (↓ Position) for ÷ 10 (moves decimal right 1 place) S5@1, S6@2, S7@5, S8@7 (.1257 rounding 4th digit) S4 in ‘0’ Position (0.1257) A usage of 520,000 SCF = 41,381,600 total pulses (520,000 x 79.
Sponsler, Inc. IT275N Remote Totalizer & Rate Indicator pg. 9 DOC#: MN-275N-A 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 FT3 is known, but not the unit volume per gallon as required to calculate calibration factor; take the reciprocal of gallons per unit volume to derive the unit volume per gallon; i.e.
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 operating 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.
IT275N Remote Totalizer & Rate Indicator Sponsler, Inc. pg. 11 DOC#: MN-275N-A Typical Output Configuration – Although the IT275N will function in all configurations caution must be exercised when incorporating 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 calibration.
IT275N Remote Totalizer & Rate Indicator Sponsler, Inc. pg. 12 DOC#: MN-275N-A MISCELLANEOUS Battery Replacement The battery is located on the Mounting PCB and inserts into 2 sockets. When installing the battery, it is imperative to OBSERVE POLARITY. Simply pull the 3-board stack (See FIGURE #5) out of the enclosure, install the battery and reinsert the board stack. The display will be all zeros. FIGURE 5 The previous figure illustrates the removal of the 3-board stack from the condulet.
Sponsler, Inc. IT275N Remote Totalizer & Rate Indicator Dimensional Information FIGURE 6 pg.
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©2009 Pub. No.
