The TSI SureFlow™ Model 8681 Adaptive Compensation Controller is the ideal digital controller for laboratories equipped with fume hoods.

The Model 8681 is a self-contained device that ensures that exhaust volume is always greater than intake volume for negative pressure controlled spaces and exhaust volume is always less than intake volume for positive pressure controlled spaces. Negative pressure balancing helps ensure that chemical vapors do not escape the laboratory and meets NFPA 45-2000 and ANSI Z9.5-2003 standards.

The SureFlow 8681 also controls laboratory space temperature by regulating heating and intake air flow. If needed, a room pressure sensor can be connected to the 8681 controller to correct for long-term changes in building dynamics.

The 8681 user provides closed-loop control of differential pressure using TSI's exclusive through-the-wall pressure sensor. The pressure sensor slowly restores the offset between supply and exhaust air flows.

The Model 8681 is easily integrated with building management systems using alarm relays or digital communications. The Model 8681 supports the open MODBUS protocol.

Features and Benefits

Independent room pressure control provides system reliability

Integrate temperature control into laboratory ventilation control

Flow tracking control ensures stability in HVAC systems

Direct pressure measurement provides continuous closed-loop control

Visual and audible alarms warn personnel of unsafe conditions

Network communications enable building-wide control efficiency

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

25 ft controller output cable

120:24 VAC transformer

25 ft transformer cable