STANDARD SPECIFICATIONS Instrument Process gas connection port: NPT 1/8 (F), Rc 1/8 Electrical conduit: NPT 1/2 (F), M20 Case structure: IEC IP66 Flame-proof structure: ATEX: II 2G Ex d II B T6 Gb; II 2D Ex tb IIIC T80 °C Db IECEx: Ex d IIB T6 Gb, Ex tb IIIC T80 °C Db TIIS: Ex d IIB T6X KOSHA: Ex d IIB T6 Display: LCD Calorie display: 5 digits % display: setting range is shown by a % and by a bar graph Automatic calibration setting display: and light up alternately when set. Calibration factor display: a flag is shown if calibration fails Communications: HART protocol ver. 7.0 (with CommStaff and HART 475 Communicator) Power: 24 Vdc ±10 %, 0.3 A max. (inrush current at startup) Output: Analog output: 4.20 mAdc Contact output: 24 Vdc ±10 %, 50 mA max. (transistor contact for status); 24 Vdc ±10 %, 1 A max. (transistor contact for calibration) Paint: Baked acrylic resin finish Color: Housing: Light beige Front cover: Dark beige Terminal cover: dark beige GasCVD Natural Gas Calorimeter Model CVM400 OVERVIEW The CVM400 GasCVD Natural Gas Calorimeter measures the thermal conductivity of a gas mixture such as natural gas at different temperatures and calculates the calorific value of the gas based on its thermal conductivity. Drawing upon expertise in gas analysis and gas calorific value measurement accumulated for more than 20 years since the release of the first Smart Gas Chromatograph, Azbil Corporation now offers compact, lightweight, and high-precision natural gas calorimeters that comply with international legal metrology standards. FEATURES (1) OIML R 140 compliant device. Can be used as a calorimeter or calorific value determining device (CVDD) for natural gas. (OIML R140: International Organization of Legal Metrology recommendation that includes specifications for CVDDs.) (2) Innovative structure compatible with various installation sites .... .............. .......................... ........ ............................ ........ .............. ...... ............ ........ ..........- weight, allowing a variety of installation site choices. .... ................................................................................................................................................ use (3) Revolutionary continuous measurement. Can detect a change of calorific value in processes in near real time by measuring every 2 seconds. (4) Fast response (sample flow rate: 50 ml/min) .... .............................................................................................................................................. MJ/m3) .... ............................................ .... ........................................ Response time is defined as the time output signal changes to 90 %. (5) Automatic calibration for prolonged stability. Automatic calibration using pure methane guarantees long-term stable operation. (6) A wealth of diagnostic functions .... ................ ........................ ...................... .................... ...................... ................ ........ operating environment is suitable, making use of a temperature sensor embedded on the same chip as the thermal conductivity sensor. .... .................................................................................................................................................. for comparison with the recommended replacement period (70000 hours) for the calorimeter. .... .................................................................................................................................................... automatic calibration records to check changes in the calibration factor. MEASUREMENT PRINCIPLE The CVM400 measures the thermal conductivity of natural gas at different temperatures, changing the temperature of the thermal conductivity sensor in multiple stages. The calorimeter uses the support vector regression (SVR) method that is also employed on Azbil Corporation’s differential pressure transmitters. The calorific value is calculated from the measured thermal conductivity values of the process using a characteristics formula created in advance based on thermal conductivities measured at different temperatures of the natural gas. No.SS2-CVM100-0100 1 6th edition 10 1 Specifications are subject to change without notice. “This product is designed for general industrial use.”