Elster

The Elster QA series consists of turbine flow meters, which are designed for higher flow rates, typically from 25 m³/h up to 650 m³/h, with nominal diameters ranging from DN25 to DN150. These meters are suitable for industrial and utility applications where large volumes of gas are measured. The MQM series, on the other hand, is a diaphragm meter, which is a positive displacement meter. The MQM10, for example, has a maximum flow rate of 16 m³/h and a 1-inch connection. Diaphragm meters are preferred for smaller loads, such as commercial buildings or light industrial processes, because they maintain accuracy at low flow rates. The choice between the two depends on the expected flow range and the required turndown ratio.

Elster QA series gas meters are rated with an accuracy of ±1.5% within the flow range of 0.2 Qmax to Qmax. This accuracy is maintained across the meter's measuring range of 1:20, which means the meter can accurately measure flow rates from 5% to 100% of its maximum capacity. For example, a QA40 with a maximum flow of 65 m³/h will maintain ±1.5% accuracy from approximately 13 m³/h up to 65 m³/h. This level of accuracy makes these meters suitable for custody transfer and process monitoring applications where precise measurement is required for billing or regulatory compliance.

Yes, Elster QA series meters are designed to measure a variety of non-corrosive gases. According to the product specifications, they are suitable for natural gas, air, methane, nitrogen, and other inert gases. The aluminum body construction is compatible with these media, and the meters are calibrated for the specific gas density and viscosity. However, it is important to verify that the meter's calibration and any associated electronic components are configured for the specific gas being measured. For gases with different properties, such as higher density or corrosiveness, a different meter type may be required. Always consult the datasheet or contact 3G Electric for guidance on gas compatibility.

Elster QA series gas meters can be equipped with several output options to facilitate remote reading and integration into control systems. Common options include a Namur inductive sensor (E200), an optical interface, M-BUS, and L-BUS. The Namur sensor is a standard for industrial environments, providing a pulse output that can be connected to a counter or PLC. The optical interface allows for local reading with a handheld device. M-BUS and L-BUS are communication protocols used for remote data collection in utility networks. These outputs enable the meters to be used in automated metering infrastructure (AMI) or building management systems, allowing for real-time monitoring and data logging.

Elster QA series gas meters are pressure-rated to 16 bar, which corresponds to PN 16. This rating is consistent across the series, including models like the QA100 and QA160. The meters are designed to withstand this pressure safely, and the aluminum body is tested to meet the required safety standards. For applications with higher pressure requirements, additional pressure reduction or regulation equipment would be needed upstream of the meter. It is essential to ensure that the meter's pressure rating matches the operating conditions of the gas system to avoid damage or safety hazards. Always verify the pressure rating on the datasheet before installation.

Selecting the correct Elster gas meter size involves determining the expected flow rate range and the available pressure. The QA series offers a range of models with different maximum flow capacities, from 25 m³/h (QA16) to 650 m³/h (QA400). The meter should be sized so that the expected minimum and maximum flow rates fall within the meter's measuring range, which is typically 1:20. For example, if your application has a minimum flow of 10 m³/h and a maximum of 200 m³/h, a QA160 with a capacity of 250 m³/h would be appropriate, as its range would be from 12.5 m³/h to 250 m³/h. It is also important to consider the pipe size and connection type. 3G Electric can assist with sizing calculations based on your specific flow data and site conditions.