NI SCXI-1125 8 Channel Isolated Analogue Input Module

NI SCXI-1125 8 Channel Isolated Analogue Input Module

The NI SCXI-1125 accurately measures the flow of digester gas produced in a wastewater treatment process is important for process productivity and environmental regulatory reporting. The measurement of gas production is directly proportional to the effectiveness and efficiency of the digester process itself. The amount of gas sent to the engine is then the key control variable if the collected gas is used as a fuel in a cogeneration or CHP system. In addition, if any gas is released or flared, as both methane and carbon dioxide are known to be polluting greenhouse gases (GHGs), local environmental regulations often require that the amount of gas released or flared be reported. Other important factors when selecting a digester gas flow meter include installation safety and ease of maintenance. Since CH 4 is a flammable, potentially explosive gas, the instrument should have an agency approval certificate for Div.1/Zone 1 HazEx installation. If the meter is to be installed before the gas is dry/cleaned or not at all, the engineer must also consider the success of measuring S deposits in wet gas, blockage or fouling of orifices or moving parts due to H 2 , and the cost and convenience of regular cleaning to remove H 2 S residues.

With no moving parts, a simple plug-in design, and full global HazEx certification, the NI SCXI-1125 flowmeter is the ideal solution for digester gas flow measurement.The ST80 flowmeter is a high-performance, rugged, thermally dispersive technology air/gas flowmeter that combines ultra-reliable, feature-rich electronics and FCI innovations such as Adaptive Sensing Technology ( AST)) with the industry’s widest range of application matched flow options combined with sensors, including FCI’s Wet Gas Flow Element, to provide a truly superior solution for moisture rich biogas applications.The ST80 meter further combines these features with a rugged transmitter housing and the industry’s widest range of process connection options to provide the longest service life and ease of user-installed duct or pipe Installation. The ST80s plug-in configuration for wastewater digester gas is a single-point flowmeter for pipe diameters greater than 2 inches (51 mm). It has a wide operating flow range: 0.25 to 1000 SFPS (0.07 to 305 NMPS).