User's Manual for CM6G - Yokogawa

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5-25.1 Notes on WiringWARNING• Cables and wires must be connected after all power supplies are turned off.• An electrical wiring duct must not be used for the simultaneous connection of a large capacityconverter, motor, or power supply.• When cables are connected in a place with high or low ambient temperatures, use cablessuitable for the place where they are used.• When cables are used in an atmosphere where harmful gases, liquids, oil, or solvents arepresent, use cables made of materials capable of withstanding those things.• Use crimp terminals with insulated sleeve (M4 screws) for the wire ends.5.2 Wiring to Peripheral Equipment5.2.1 Power SupplyUse a 600 V insulated vinyl cabtyre cable (JIS C3312) with a cross-section area of 2 mm 2 or more, ora wire or cable that is the equivalent or better.5.2.2 GroundingConnect a grounding wire to the grounding terminal inside the panel. A grounding wire must beconnected so that the grounding resistance becomes 100 Ω or less (equivalent to JIS Class D).5.2.3 Analog Output (4 to 20 mA DC)Use a shielded twisted pair cable with a cross-section area of 0.5 mm 2 or more, or a cable that isthe equivalent or better, and install it separately from the power supply and alarm output cables andsources of electromagnetic interference. A shielded cable must be connected to the frame ground(FG) beside each of the output terminals. The load resistance from the perspective of this equipmentmust be 750 Ω or less.5.2.4 Contact OutputUse a 600 V insulated vinyl cabtyre cable (JIS C3312) with a cross-section area of 2 mm 2 or more, ora wire or cable that is the equivalent or better.The flame extinction alarm contact and orifice chamber temperature drop alarm contact must be nonvoltagedry contacts and the contact rating must be as follows.ContactFlame distinction alarm contactOrifice chamber temperature drop alarm contactRating100 V AC 5 A100 V AC 3 A5.2.5 Contact Input (Remote Ignition: Custom Order)A non-voltage contact must be input as a contact input signal. The contact rating is 24 V DC 1 A.The open or closed state of the input is determined by the resistance value from the perspective of thisequipment. The resistance value also includes the wiring resistance.Contact closed: 200 Ω or less. Contact open: 100 kΩ or more.IM 11R02A01-02E
6. Construction and FunctionTypical System Configuration 6-1Calorie DetectorGas CalorimeterDensity MeterPComputing StationOutput4-20mA DC1 to 5V DCCalorific ValueWI (Wobbe Index)SolenoidValveDifferentialPressureTransmitterOrifice AssemblyGasPressureRegulatingUnitSample GasAirPressureRegulatingUnitInstrument AirF00.aiItemCalorie detectorComputing station (digital)Density meterDifferential pressure transmitterOrifice assemblySolenoid valveFunction / DescriptionDetects WI or calorific value. Generates an alarm and takes protectiveactions when the burner flame goes out or abnormal combustion occurs.Calculates WI or calorific value. Displays selected parameters, e.g., eachdifferential pressure and calorific value. Adjusts zero / span and others.Measures density used for calculation of calorific value. Not required forWI measurement.Detects differential pressure of gas and air before and after orifice, andconverts it to an electrical signal.Gas and air orifices housed in the constant temperature chamber.Serves as a safety valve to shut off the sample gas flow.Figure 6.1 Components and Functions of Model CM6G Gas Calorimeter6.1 Air Pressure Regulating SectionSEE ALSORefer to Figure 6.2, 6.3 and 6.4The instrument air pressure (300 to 700 kPa) is reduced by air set (2-1) to about 200 kPa, furtherreduced to about 20 kPa by the pressure reducing valve (2-2) and after that the pressure is set byneedle valve (V-16) to the differential pressure 500 Pa.The air is controlled at 40°C in the preheater, which helps the temperature control by the orifice.When the temperature is increased more than 60°C, thermostat in the preheater operates andintercepts the power supply of the heater. This air pressure regulating section is common to allsystems.IM 11R02A01-02E
Page 1: User’sManualModel CM6GGas Calorim
Page 4 and 5: iiTIPThis symbol gives information
Page 7 and 8: iModel CM6GGas CalorimeterIM 11R02A
Page 9 and 10: iii9.4 Calibration of the Density M
Page 11 and 12: 1. Outline 1-1Model CM6G Gas calori
Page 13 and 14: 2. Specifications 2-12.1 Standard S
Page 15 and 16: 2-3Utility : Water : Approx. 0.2 l/
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Page 21 and 22: 2-92.4.4 Dimensions of Options1. Pr
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Page 25 and 26: 4-14. Outside PipingsThe connection
Page 27: 5-15. External WiringsExternal wire
Page 31 and 32: 6-3Standard Flow Sheet1. Town Gas A
Page 33 and 34: 6.3 Differential Pressure Detection
Page 35 and 36: 6-7POWERLampIGNITLampMEASLampALARML
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Page 44 and 45: 6-166.6 Density MeterThe GD400G is
Page 46 and 47: 7-27.4 Supply of the AirOpen valve
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Page 52 and 53: 9-29.1.2 For Steel Mill UseSEE ALSO
Page 54 and 55: 9-49.3 Calibration of the Computing
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Page 58 and 59: 10-410.2.4 Washing Bubbler or Press
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Page 66 and 67: 11-47) When the density meter is at
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Page 70 and 71: 12-2b) Print circuit board assembly
Page 72 and 73: 12-412.3 Preheater E7023NGNo. Name
Page 74 and 75: 12-612.8 Temperature Controller E70
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Revision Informationi Title Manual
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User’sManualModel CM6GGas Calorim
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2-2Utility :Instrument Air : Approx
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2-42.2.2 Standard AccessoriesFollow
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5-25.1 Notes on WiringWARNING• Ca
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User's Manual for CM6G - Yokogawa

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