RKI 72-2120-401 Digester gas monitor, 100% volume CH4 / 25% volume O2 / 50% volume CO2 / 1,000 ppm H2S

Description

RKI is proud to introduce the RKI 72-2120-401 Digester Gas Monitor. Gas from waste digesters contains high levels of methane, CO2 and H2S, with little to no oxygen present. The RKI gas monitor checks for all these gases on a cyclic basis. A powerful air aspirator pulls a sample from up to 100' (30.5 m) away. Since digester gas contains high humidity and high H2S, both of which can cause damage to sampling systems, the RKI Digester Gas Monitor is designed to handle these with no damage to the sampling system or sensors. The sample is filtered through a series of dirt, dust and moisture stopping filters, and these filters are automatically blown back and cleaned out with fresh air at the end of each cycle. After each cycle, the sensors and sampling system are flushed with fresh air so as to minimize corrosion caused by the high H2S content. The system is fault tolerant minimizing the possibility of expensive repairs or downtime. System integrity is maintained at all times using a flow fail monitoring device which provides a fail alarm and relay if there is ever a problem with the flow system, such as a blockage, or if the air aspirator compressed air supply is removed or interrupted.

Features

• NEMA 4X enclosure with clear window and corrosion-resistant design to ensure long-lasting use
• Constructed to withstand extreme environments and extreme samples
• Sample system for high humidity
• Accurately measures gas with high levels of H2S present
• H2S 0 to 1,000 ppm (0 to 3,000 or 0 to 5,000 ppm optional)
• Self-draining moisture trap
• Back flush for sample line
• Made with no moving parts for extended aspirator wear life
• Can be placed indoors or outdoors (wall-mounted)
• Proven RKI technology for reliable performance
• Modular design is easy to maintain
• Simple to operate
• Measurement time is just 4 minutes, taken at periodic cycles; cycle time is selectable, with settings for cycle time of 1 hour, 4 hours, 8 hours, 24 hours or 7 days
• Contains adjustable alarm levels for each gas and also programmable alarm relays
• Provides 4 to 20 mA signals for each gas concentration for connection to an external DCS, PLC or other site control system
• Modbus output is also available
• Outputs are the readings received from the last cycle taken

Specification