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The TSI SureFlow™ Adaptive Offset Controller Model 8681 is an ideal digital controller for laboratories with fume hoods.
A stand-alone device, the 8681 ensures that the exhaust volume is always greater than the supply volume for negative spaces, and less than the supply volume for positive spaces. This negative air balance helps ensure that chemical vapors cannot diffuse outside the laboratory, complying with requirements in NFPA 45-2000 and ANSI Z9.5-2003.
The SureFlow 8681 with battery such as Li202SX Battery, Li202SX-6600 Battery, Li202SX-66C Battery, Li202SX-7200 Battery, Li202SX-7800 Battery, Li202SX-78C Battery, TSI 8240 Battery, TSI 9130 Battery, TSI 9550 Battery, TSI 9510BD Battery, TSI AEROTRAK APC 9510-02 Battery, Zoncare BAT-120003 Battery also controls the temperature of the laboratory space by modulating reheat and the supply air volume. Optionally, a room pressure sensor can be connected to the 8681 controller to correct long-term changes in the building dynamics.
The 8681 uses TSI's unique through-the-wall pressure sensor to provide closed-loop control of the pressure differential. The pressure sensor slowly resets the offset between the supply and exhaust flows.
The 8681 easily integrates to the building management system using either alarm relays or digital communications. The 8681 supports the open MODBUS protocol.
Features and Benefits
•Stand-alone room pressure control provides system reliability
•Integrates temperature control into laboratory ventilation control
•Flow tracking control ensures stability in the HVAC system
•Direct pressure measurement provides continuous, closed-loop control
•Audible and visual alarms warn staff of unsafe conditions
•Network communications allow for building-wide control efficiencies
•Convenient keypad and display support local programming
•Passwords prevent unauthorized access to controller functions
Applications
•Laboratories with fume hoods
Included items
•Digital interface module
•Through-the-wall pressure sensor
•Controller output cable, 25 ft
•Transformer, 120:24 VAC
•Transformer cable, 25 ft
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