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User’s Guide
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e-mail: info@omega.com
FC-21
Flow Computer
99579 08/21/03
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CONTENTS 1. DESCRIPTION 1.1 Unit Description ...............................................................................................1 1.2 Unit Features ...................................................................................................1 1.3 Specifications ..................................................................................................2 2. INSTALLATION 2.1 General Mounting Hints..............................................................................
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CONTENTS 7. PRINCIPLE OF OPERATION 7.1 General..........................................................................................................38 7.2 Orifice Flowmeter Considerations .................................................................38 7.3 Flow Equations ..............................................................................................38 7.4 Calculating the Expansion Factor..................................................................41 7.5 Computation of
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FC-21 Flow Computer Unit Description 1. Description 1.1 Unit Description: The FC-21 Flow Computer satisfies the instrument requirements for a variety of flowmeter types in liquid applications. Multiple flow equations and instrument functions are available in a single unit with many advanced features. The alphanumeric display shows measured and calculated parameters in easy to understand format. Single key direct access to measurements and display scrolling is supported. The versatility of the F
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FC-21 Flow Computer 1.3 Specifications: Specifications: Pulse Inputs: Environmental Number of Flow Inputs: one Indoor Use Configurations supported: single input with or Altitude up to 2000m without quadrature (menu selectable) Operating Temperature: 0°C to +50°C Input Impedance: 10 K Ω nominal (-20°C to 55°C optional) Pullup Resistance: 10 K Ω to 5 VDC (menu Storage Temperature: -40°C to +85 C selectable) Maximum Relative Humidity : 80% for temperatures Pull Down Resistance: 10 K Ω to common up
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FC-21 Flow Computer Relay Outputs Operating Mode The relay outputs are menu assignable to The Flow Computer can be thought of as making a (Individually for each relay) Low Rate Alarm, Hi series of measurements of flow, temperature/ Rate Alarm, Prewarn Alarm, Preset Alarm, Pulse density sensors and then performing calculations Output (pulse options) or General purpose warning to arrive at a result(s) which is then updated (security). periodically on the display. The analog output, the pulse out
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FC-21 Flow Computer Setup Mode Maintenance Mode: The setup mode is password protected by means of The Maintenance Mode of the FC-21 is the Test a numeric lock out code established by the user. In and Calibration Mode for the device. This mode addition, a secret, manufacturers numeric unlock provides a number of specialized utilities required entry sequence is available. for factory calibration, instrument checkout on start- up, and periodic calibration documentation. The system also provides a
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FC-21 Flow Computer Operation of Serial Communication Port with Operation of Serial Port with Modems (optional) Printers The FC-21 RS-232 channel supports a number of FC-21’s RS-232 channel supports a number of operating modes. One of these modes is intended operating modes. One of these modes is intended to support operation with a modem in remote to support operation with a printer in metering metering applications. FC-21’s role is that of DTE applications requiring transaction printing, data
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FC-21 Flow Computer 2. Installation 2.1 General Mounting Hints: General Mounting Hints The FC-21 Flow Computer should be located in an area with a clean, dry atmosphere which is relatively free of shock and vibration. The unit is installed in a 5.43" (138mm) wide by 2.68" (68mm) high panel cutout. (see Mounting Dimensions) To mount the Flow Computer, proceed as follows: Mounting Procedure a. Prepare the panel opening. b. Slide the unit through the panel cutout until the it touches the panel. c.
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FC-21 Flow Computer 3. Applications 3.1 Liquid Volume Liquid Volume Measurements: A flowmeter measures the actual volume in a liquid line. A temperature sensor can also be installed to correct for liquid thermal expansion (see 3.2 Corrected Volume). Calculations: • For Flowmeters with Pulse Outputs, Volume flow is calculated using the flowmeter frequency output and the user entered K-Factor. • For Flowmeters with Analog Transmitters, Volume flow is calculated using the measured flowmeter signal
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FC-21 Flow Computer 3.2 Corrected Liquid Volume Corrected Liquid Volume Measurements: A flowmeter measures the actual volume in a liquid line. A temperature sensor is installed to correct for liquid thermal expansion. Calculations: • Corrected Volume is calculated using the flow and temperature inputs as well as the thermal expansion coefficient stored in the flow computer. Use the "SET FLUID PROPERTIES" submenu to define reference temperature and density values for standard conditions. Output
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FC-21 Flow Computer 3.3 Liquid Mass Liquid Mass Measurements: Actual volume is measured by the flow element (DP transmitter, Flowmeter). Temperature is measured by the temperature transmitter. A density transmitter can be used for direct density measurements. Calculations: • The density and mass flow are calculated using the reference density and the thermal expansion coefficient of the liquid (see "SET FLUID PROPERTIES" submenu) Output Results: • Display Results Flow Rate, Resettable Total, No
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FC-21 Flow Computer 3.4 Batching Batching Measurements: A flowmeter measures the actual volume in a liquid line. A temperature sensor can also be installed to correct for liquid thermal expansion (see 3.2 Corrected Volume). Calculations: • For Flowmeters with Pulse Outputs, Volume flow is calculated using the flowmeter frequency output and the user entered K-Factor. • For Flowmeters with Analog Transmitters, Volume flow is calculated using the measured flowmeter signal and the user entered scal
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FC-21 Flow Computer 4 WIRING 4.1 Typical Batcher Wiring: Batcher Wiring (+) V 1 DC OUTPUT FLOW Signal 2 PULSE IN 1 Vin + IN 3 PULSE IN 2 Iin + Common 4 COMMON 5 --------- Vin + FLOW SENSOR 6 RTD EXCIT + COMP 7 RTD SENS + IN Iin + RTD SENS - 8 Stop Start 9 CNTR IN 1 10 CNTR IN 2 SEE USER 11 CNTR IN 3 MANUAL 12 COMMON 13 PULSE OUTPUT + 123456 14 PULSE OUTPUT - 15 Remote Counter ANALOG OUTPUT + 4-20 mA 16 ANALOG OUTPUT - 115 VAC MOV 17 NC 25 NC recommended 18 COM RLY1 26 COM RLY3 19 NO 27 NO 20 N
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3 4 4 3 FC-21 Flow Computer 4.3 Wiring In Hazardous Areas: Examples using MLT787S+ Barrier (MTL4755ac for RTD) Flow Input Flow Input Hazardous Area Safe Area + 4-20mA Flow 4-20 1 24V Out 28V Diode Transmitter 2 Q/∆P – 3 4-20mA In 4 Common Temperature Input Temperature Input (4-20mA Transmitter) (4-20mA Transmitter) Hazardous Area Safe Area 24V Out 1 4 Common – 4-20mA Temp. 4-20 28V 8 4-20mA In Diode Transmitter T + Temperature Input (RTD) Temperature Input (RTD) Hazardous Area Safe Area 4 Common
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FC-21 Flow Computer 5. UNIT OPERATION 5.1 Front Panel Operation Concept for Run Mode The FC-21 is fully programmable through the front panel. Please review the following usage summary before attempting to use the instrument. TOTAL RATE PRE 1 TEMP PRINT CLEAR MENU START 1 2 3 4 5 GRAND SCROLL PRE 2 DENS TIME HELP STOP ENTER 6 7 8 9 0 • – How To Use HELP On-Line Help On-line help is provided to assist the operator in using this product. The help is available during RUN and SETUP modes simply by
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FC-21 Flow Computer General 5.2 General Operation Operation The unit can display: Rate, Total, Grand Total, Temperature, Density, Presets and Time of Day. The Temperature and/or Density can be displayed even if you are using the Volumetric Flow Equation (a Temperature or Density sensor must be installed). The unit can perform Mass or Corrected Volume equations using a temperature or density sensor (these equations can be computed without Temp/Dens sensors by using user defined default values).
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FC-21 Flow Computer RS-232 Serial Port 5.3.5 RS-232 Serial Port Operation in Rate/Total mode (Rate/Total mode) The RS-232 serial port can be used for programming (using the Setup Disk) or for communicating to printers and computers in the Operating Mode (Run Mode). PC Communications: The Setup Disk also allows the user to query the unit for operating status such as Flow Rate, Flow Total, Temperature, Density, Presets, etc. Operation of RS-232 Serial Port with Printers: Transaction Printing For
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FC-21 Flow Computer 5.4 Batcher Operation The Batcher mode is used primarily to control batches. The main difference between the Batch mode and Rate/Total mode is the relay operation. The Batch mode allows the operator to "START" the unit via the front panel or remote input. Once started, the relays (RLY1 & RLY2) will energize and send power to a flow control device (i.e. solenoid valve or pump). The flow sensor will send a signal to the unit and total accumulation will begin. When the Prew
