INSTALLATION & OPERATION MANUAL MODEL IT375 FIELD MOUNTED RATE INDICATOR AND TOTALIZER February 2002
Sponsler, Inc. Model IT375 Contents CONTENTS 1. Introduction 1.1 Model Number Designation 1.2 Intrinsic Safety Considerations 3 4 4,5 2. Specification 6 3. Operation 3.1 Display 3.2 Test Mode 3.3 Filtering 3.4 Calculation of Rate and Total 3.5 Total Conversion 3.6 Frequency Cutoff 3.7 Linearizer 7 7 7 8 9 9 10 10 4. Programming 4.1 Program Steps 4.1 Flow Chart 11 12,13 14,15 5. Example 16 6. Versions 6.1 Battery Powered Version 6.2 DC Power Version 6.
Sponsler, Inc. Model IT375 Introduction Pg. 3 1. INTRODUCTION The Model IT375 Rate Totalizer is a microprocessor-based instrument that accepts a sinewave or pulse input from Sponsler Company, Inc. Precision Turbine Flowmeters. The instrument displays 5 digits of Flowrate, 7 digits of Resettable Total and an Accumulated Total. The displayed rate and total values can be in different engineering units. The instrument is compatible with a wide range of flowmeters.
Sponsler, Inc. Model IT375 Introduction 1.1 MODEL NUMBER DESIGNATION The Model Number of the IT375 describes the power & output options installed and the mounting options. Model IT375i .
Sponsler, Inc. Model IT375 Flowmeter Input: Entity parameters on the flowmeter enable connection to a wide range of approved sensors. Input parameters are: Ui = 24V Ii = 20mA Pi = 320mW The internal capacitance and inductance seen on these terminals is 0.002uF and 0mH. Output parameters are: Uo = 10.0V Io = 9.0mA Maximum allowed external capacitance is 60µF. Maximum allowed external inductance is 1.5H. Introduction Pg.
Sponsler, Inc. Model IT375 Specifications Pg. 6 2. SPECIFICATION General: Display: Resettable Total: Accumulated Total: Rate: K-factor: Decimal Points: Timebase: Frequency Range: Signal Type: Battery Powered Version: Type: Battery Life: LCD which is continuously powered. 7 digits with 10mm (0.4") high digits. Resettable from front panel. Displayed when the ACCUM TOTAL button is depressed. 5 digits with 8.5mm (0.33") high digits. The pulses per unit of measure (eg.
Sponsler, Inc. Model IT375 Operation Pg. 7 3. OPERATION The Model IT375 Rate Indicator and Totalizer accepts a sinewave or pulse input from a wide range of flowmeters. The instrument is fully programmable with all operating parameters and calculation constants programmable from the front panel. The setup parameters are stored in a non-volatile memory and are retained for at least 40 years in the event of a power loss. 3.
Sponsler, Inc. Model IT375 Operation Pg. 8 3.3 FILTERING Frequency fluctuations caused by pulsating flow through a flowmeter can interfere with the precision of the displayed rate. For this reason, the Model IT375 has a programmable digital filter which will average out these fluctuations and enable accurate, stable readings. The degree of filtering of the input signal can be adjusted depending on the magnitude of fluctuation and the particular application.
Sponsler, Inc. Model IT375 Operation Pg. 9 3.4 CALCULATION OF RATE The flow rate, R, is calculated as follows: R=f x H K where f is the input frequency in Hz (pulses/second). H is the timebase of rate and is 1 for seconds, 60 for minutes, 3600 for hours and 86,400 for days. K is the Kfactor (pulses/unit volume). The Kfactor is flowmeter dependent and is supplied with the flowmeter. It will be either on a calibration certificate or stamped on the body of the meter.
Sponsler, Inc. Model IT375 Operation Pg. 10 3.6 FREQUENCY CUTOFF A frequency cutoff can be programmed below which flow rate is not registered. Input frequencies at or below the cutoff are totalized, however, the rate is displayed as zero. The frequency cutoff has a default value of 0.25Hz. The cutoff should be left as 0.25Hz unless the flowmeter in use has a lower frequency. Note that the lower a cutoff frequency the correspondingly longer response time for flow rate to update.
Sponsler, Inc. Model IT375 Programming Pg. 11 4. PROGRAMMING The Model IT375 is fully programmable with all parameters being stored in non-volatile memory. The Program Mode can be entered in one of two ways: 1. By removing the lower cover strip (ie. the dark grey strip along the bottom of the enclosure) and reversing it’s left – right orientation. This brings a small magnet on the inside of the cover strip in contact with a reed switch inside the instrument. 2.
Sponsler, Inc. Model IT375 4.1 PROGRAM STEPS Step Comment CAL 00 Pulse Output (applies to DC Power/Alarm version only). 0 = No pulse output, low and high alarms. 1 = Scaled pulse output and low alarm. 2 = Unscaled pulse output and low alarm. CAL 01 Kfactor - whole numbers. CAL 02 Kfactor - digits after the decimal point. The Kfactor is the pulses per unit of measure (eg. pulses/litre, pulses/gallon, etc). The Kfactor can be programmed in the range of 0.000001 - 999,999. See Section 3.4.
Sponsler, Inc. Step Model IT375 Comment CAL 10 & 11 program the flow rate below which the low alarm relay will close. The value can be programmed in the range 0 to 999,999. CAL 12 High Alarm or Pulse Output Factor - whole numbers. CAL 13 High Alarm or Pulse Output Factor - digits after the decimal point. CAL 12 & 13 program the flow rate above which the high alarm relay will close. The value can be programmed in the range 0 to 999,999.
Sponsler, Inc. Model IT375 Programming Pg. 14 PROGRAMMING INITIATE – REMOVE & REVERSE BOTTOM STRIP EXIT – REPEAT ABOVE STEP 0 = FLASHING DIGIT TOTAL 1468523 RATE PULSE OUTPUT 0 1 2 79.
Sponsler, Inc. Model IT375 Programming Pg.
Sponsler, Inc. Model IT375 Example Pg. 16 5. EXAMPLE A typical 2 inch liquid flowmeter has an operating range of 15 – 225 gpm and produces 148.914 pulses per gallon with a maximum output frequency of 563Hz. 3 points of linearization is required. The flow rate is displayed in gallons/min with 1 decimal point and the total in liters with no decimals.
Sponsler, Inc. Model IT375 Versions Pg. 17 6. VERSIONS This table summarizes features of each of the different Model IT375 versions: Model Number IT375i.X0L IT375i.X3L IT375i.
Sponsler, Inc. Model IT375 Versions Pg. 18 6.2 DC POWER VERSION The DC power version will operate from an external power source between 9-28VDC and draws no more than 4mA. This enables the instrument to be powered from AC mains with DC adaptors and eliminates the need to run separate DC voltages in the field. The instrument uses lithium batteries for backup if the DC power is interrupted. However, alarms and/or pulse outputs are disabled if the DC power is interrupted.
Sponsler, Inc. Model IT375 Versions Pg. 19 6.3 RELAY AND 4-20mA OUTPUT VERSION This version combines features of the DC powered with a 4-20mA output. The 4-20mA output provides a two-wire retransmission of the flow rate. Both the 4mA and 20mA setpoints are fully programmable so that the output can span either the entire operating range or only a portion. The instrument draws its operating power from the 4-20mA loop and uses the internal lithium batteries for backup if the 4-20mA loop is interrupted.
Sponsler, Inc. Model IT375 Flowmeter Input Pg. 20 7. FLOWMETER INPUT The Model IT375 has an input conditioning circuit which will accept signals from most sinewave or pulse producing flowmeters. Links on the rear panel enable the input circuit to be configured for different signal types. The input will interface directly to: Turbine flowmeters. Open collector outputs. Reed switches. Logic signals. Two-wire proximity switches. The following pages give examples of interfacing to various signal inputs.
Sponsler, Inc. 1. Squarewave, CMOS or Pulse Flowmeter Input Pg. 21 Model IT375 Link Settings COIL PULSE DB DBH Link 1 Link 2 Link 3 NPS Switching threshold voltage is 1.3 volts. 2. Open Collector With 15µA/150µA internal pull up current Link Settings COIL PULSE DBL DBH Link 1 Link 2 Link 3 NPS 3. Reed Switch - Battery Powered Link Settings With 15µA internal pull up current COIL PULSE DBL DBH Link 1 Link 2 Link 3 NPS eg. Positive displacement flowmeters with reed switch outputs.
Sponsler, Inc. Flowmeter Input Pg. 22 Model IT375 5. Coils Link Settings COIL PULSE DB DBH Link 1 Link 2 Link 3 NPS 825R input impedance eg. Millivolt signal from paddlewheel or turbine (15mV P-P minimum). Note: If the input has a very high impedance, the following link settings should be used: Link Settings COIL PULSE DBL DBH Link 1 Link 2 Link 3 NPS 6.
Sponsler, Inc. Model IT375 Intrinsic Safety Pg. 23 8. INTRINSIC SAFETY CONNECTIONS When installing the Model IT375 in hazardous areas, the wiring and installation must comply with appropriate installation standards. The approval uses entity parameters on the input for connections to the flowmeter and associated apparatus type approval for the 4-20mA output. The 4-20mA output must, therefore, only be connected to barriers with the specified safety parameters as shown on the following page. 8.
Sponsler, Inc. Model IT375 Intrinsic Safety SAFE AREA IS Barrier Ro = 300 ohm Pg. 24 HAZARDOUS AREA + 2+ - 1- 7Rate Totalizer Cable length < 5 km IS BARRIER Uo = 28 V maximum Io = 93 mA maximum Po = 0.653 W maximum L/R < specified for selected barrier 8+ MODEL IT375 ENTITY PARAMETERS FOR INPUT TERMINALS 7 & 8 Ui = 24 V Ii = 20 mA Pi = 320 mW Ci = 0.002 uF Li = 0.0 EXAMPLES BARRIERS MTL 187’ 787, 787SP, 3041, 3042, 2441, 2442, 4041, 4045 Uo = 10.0 V Io = 9.0 mA Cext = 60 uF Lext = 1.
Sponsler, Inc. Model IT375 Intrinsic Safety Pg. 25 8.4 ALARM OUTPUTS The low alarm and high alarm/pulse output can be connected to suitably certified devices provided the circuit is protected with a barrier with the maximum safety parameters: Uo = 28V Io = 93mA Pmax = 0.653W The input capacitance on these terminals is 0.1uF max and the inductance is negligible. Note: The two alarm outputs must be kept as independent IS circuits and each protected with their own barrier.
Sponsler, Inc. Model IT375 Installation Pg. 26 9. INSTALLATION 9.1 WALL MOUNTING A wall mounting bracket is supplied with each instrument. Round head screws should be used to attach the bracket to the wall (countersunk screws should not be used). The bracket is mounted first with the tray section at the bottom. The instrument is then mounted on the bracket with two screws as shown below. 9.
Sponsler, Inc. Model IT375 Installation Pg. 27 9.3 REMOVING THE FRONT PANEL The front panel should be removed as follows: 1. Remove the top and bottom cover strips (ie. the dark plastic strip) by levering a screwdriver under one end. 2. Undo the screws retaining the front. Do not remove the screws, they are retained by O-rings. 3. Remove the front panel from the housing. To replace the front cover, reverse the above procedure.
Sponsler, Inc. Model IT375 Installation Pg. 28 9.5 WIRING When connecting the IT375 it is good practice to use shielded cable. The shield should be connected to earth at one end of the cable. The other end of the shield should not be connected. This wiring practice is mandatory in order to comply with the requirements for Electromagnetic Compatibility as per EMC-Directive 89/336/EEC of the Council of the European Community. 9.
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Sponsler Company, Inc. Model IT375 Index Pg.
Sponsler Company, Inc. Model IT375 Index Pg.
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