Hach Company's Open Channel Flowmeter
The Sigma flowmeter, Model 920, was designed for dual-channel or redundant collection system flow monitoring. It's ideal for either permanent or portable applications. Model 920 has multiple sensors for redundancy, averaging and multiple pipe monitoring, sampler pacing capabilities, and rainfall logging features available. Long battery life (over 90 days) reduces sites visits and an internal modem automates data retrieval and reporting.