CUSTODY TRANSFER GAS FLOW MEASUREMENT AND PROCESS MONITORING
Technical Data:
| Measured values | Volumetric flow, a. c., volume a. c., gas velocity, sound velocity |
| Number of measuring paths | 2, 4, 4+1, 4+4 |
| Measurement principle | Ultrasonic transit time difference measurement |
| Measuring medium | Natural gas, air, C 2 H 4 , steam, process gases (e. g. CO 2 up to 100%, N 2 , O 2 , Cl 2 etc.), gases like sour gas or bio gas with high H 2 S content |
| Measuring ranges Volumetric flow, a. c. | 4 … 400 m3/h / 1,600 … 100,000 m3/h Measuring ranges depend on nominal pipe size |
| Repeatability | < 0.1 % of the measured value |
| Accuracy
2-path version 1 : 4-path version 2 : 4-path version 2 : 4-path version 2 : |
Error limits ≤ ± 1 % ≤ ± 0.5 % Dry calibrated≤ ± 0.2 % After flow calibration and adjustment with constant factor ≤ ± 0.1 % After flow calibration and adjustment with polynomial or piecewise correction2 In the range Q t … Q max with straight 20D/3D inlet/outlet section or with 10D/3D flow conditioner2 In the range Q t … Q max with undisturbed 10D/3D inlet/outlet section or with 5D/3D flow Conditioner |
| Diagnostics functions: | Integrated device diagnosis and extended diagnosis via MEPAFLOW600 CBM software |
| Gas temperature: | ––40 °C … +180 °C,–194 °C … +280 °C |
| Operating pressure: | 0 bar (g) … 250 bar (g) On request: Up to 450 bar (g) |
| Nominal pipe size | 2 ” … 48 ” (DN 50 … DN 1200) |
| Ambient temperature ATEX, CSA:
IECEx: |
–40 °C … +60 °C,–40 °C … +70 °C Optional,–50 °C … +70 °C |
| Storage temperature | –40 °C … +70 °C |
| Ambient humidity | ≤ 95 % Relative humidity |
| Conformities: | AGA-Report No. 9 API 21.1 OIML D11 OIML R137-1 ISO 17089-1 BS 7965 Pattern approval: MID, PTB, NMi, Measurement Canada, GOST … |
| Ex-approvals IECEx,ATEX,NEC/CEC (US/CA) | Gb/Ga Ex d e ib [ia Ga] IIA T4, Gb/Ga Ex d e ib [ia Ga] IIC T4 Ultrasonic transducers intrinsically safe II 1/2G Ex de ib [ia] IIA T4 II 1/2G Ex de ib [ia] IIC T4 Ultrasonic transducers intrinsically safe Class I, Division 1, Groups B, C, D T4 Class I, Division 2, Groups A, B, C, D T4 Class I, Division 1, Group D T4 Class I, Division 2, Group D T4 Ultrasonic transducers intrinsically safe |
| Electrical safety | CE |
| Enclosure rating | IP 65 / IP 66 / IP 67 |
| Analog outputs | 1 output: 4 … 20 mA, 200 Ω Active/passive, electrically isolated |
| Digital outputs | 3 outputs:30 V, 10 mA Passive, electrically isolated, Open Collector or according to NAMUR (EN 50227), f max = 6 kHz(scalable |
| Interfaces | RS-485 (2x, for configuration, output of measured values and diagnosis) |
| Bus protocol | Modbus ASCII,Modbus RTU HART |
| Operation | Via meter display and software MEPAFLOW600 |
| Dimensions (W x H x D) | See dimensional drawings |
| Weight | Depending on device version |
| Material in contact with media | Low temperature carbon steel, stainless steel, duplex steel |
| Electrical connection | 12 … 28.8 V DC With active current output: 15 … 28.8 V DC≤ 1 W |
