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Flow control of chemical and other liquid media at very low flow rates has been and continues to be considered the industry challenge with ongoing need for technical improvement. Control valves used with flow meters have a series of engineering and application problems for which no easy solution is often available. Valve isolation, media compatibility of valves, use of switching on/off vs. proportional valves, ‘volume dead spaces’, speed of valve response to an input, “sticktion”, and pressure losses due to insertion all significantly impact design and performance of chemical flow control devices. Couple these challenges with the inherent limitation of flow metering technology at very low flow rates (undetectable bypass flow of rotating paddle wheels and turbines, low flow sensor signal and high sensor noise at low flow, vibration accuracy losses of Coriolis flow sensors, inability to measure non-conductive media by magnetic flow sensors), and a difficult problem is even more acute.

The BI-7000 Liquid and Chemical Flow Controller was developed to minimize inherent low flow control challenges and maximize advancing low flow control technology. Expanding Bowman Industry and Manufacturing’s Corroperm ™ corrosion protection sensor technology to proportional valves and wedding them to the intrinsic Bowman Industry advantage of pressure based laminar flow sensing methodology allows the BI-7000 chemical and liquid flow controller to specify control accuracy of +/- 1% full scale flow under 2 ccm. The same accuracy specified for the BI-7000 models from 500 ccm and lower is standard.

Applications benefiting from this advance in low flow control are common: R&D, analytical laboratories, chemical dosing control, pharmaceutical and bio-pharmaceutical drug discovery and process control, on-line chemical and medical analyzers, additive and batch control, chemical and bio-warfare sensors and control, industrial hygiene and pollution control equipment – all need advanced low flow chemical control.

Go to BI-7000 Specification Page
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FEATURES BI-7000 Liquid and Chemical Flow Controller:

• Corroperm ™ product protection from aggressive chemicals and liquids
• Very low and precise flow control under 2 ccm
• Flow control ranges from 500 ccm and under
• Real time flow sensing and proportional valve feedback in less than 50ms
• Control equilibrium in 250ms
• Set point command: local, remote or PC
• Internal PID and/or external PID tuning
• Bench top and Panel mount models
• Flow Totalizer
• Streaming RS-232 data for volumetric flow, totalized flow and set point
• Field flow rate re-ranging and orifice/laminar flow element substitution
• Field replacement proportion valve assembly for re-ranging
• Can be serviced in-line
• Programmable alarms and relay
• Multiple outputs-analog and digital proportional to flow
• Touch screen user interface-menu driven
• Clear, bright, adjustable contrast, indicating display