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TEK-AIR FLOWMETER - FVC2600 SERIES - SASH SENSING FUME HOOD CONTROL SYSTEM

 

For basic constant velocity fume hood control using sash position sensing, Tek-Air recommends model FVC-2600. This system utilizes sash position to reset the volume setpoint in the duct exhaust volume sensing equipment. Tek-Air's VorTek airflow traverse probes provide volumetric measurement in that application.

The result of the exhaust volume changing based on sash position, allows the controller to maintain a constant face veloicty at the opening of the sash. The basic system consists of a controller, sash sensor(s), display unit, i/p transducer, and an exhaust air control valve with integral flow measurement sensors. The controller is typically wall-mounted above the fume hood.

The FVC2600 also works well with the AV3000 control valve when the I/P output is wired to the fast acting electric actuator

Tek-Air FVC2600 Series

 

..Applications
Economical, high performance VAV system capable of instantaneous response to changes in sash opening and air handling systems
Designed for vertical and horizontal fume hoods
True "closed loop control system" using Sash Position to reset the Volume Set Point of the Hood Control Valve.
Additional night-time face velocity setback feature

Principle of Operation
The FVC2600 consists of the following basic elements:
1. Sash position sensors and transmitter
2. Fume hood display
3. Controller
4. Electronic to pneumatic converter or actuator
5. Exhaust air control valve with VorTek airflow probes
6. Configuration tool (not shown)
In simple terms, the VorTek airflow sensor in the fume hood exhaust duct measures and reports the airflow volume to the FVC2600 controller. The volume setpoint is set for both "occupied" and "unoccupied" status via a hand-held configuration tool. The appropriate setpoint is then selected, via a digital input, by the Building Automation System, a time clock lock or other switching system. The controller then modulates the exhaust valve, via the Electronic-to-Pneumatic Converter to maintain the proper airflow rate.

Tek-Air FVC2600 Series  Installation

 

Specifications FVC2600
Power.......................................24 VAC +/- 10%, 10 VA max.
Display
LCD...................................4 1/2 Digit
Dimensions.......................5 in. x 3.125 in. x 1.5 in.
Keypads............................Mute, Parameters
LEDIndicators
Normal..............................Green
Alarm.................................Red
Emergency (purge).............Red
Face Velocity
Range................................0 to 1000 fpm
Resolution..........................5 fpm
Accuracy............................+/- 5 fpm @ 100 fpm
Low Alarm Setting...............0 to 500 fpm
High Alarm Setting..............100 to 1000 cfm
Alarm Delay.........................Adjustable, 5 to 30 seconds
Airflow Volume
Range..................................0 to 5000 cfm
Resolution...........................1 cfm
Accuracy.............................+/- 1.5% Rate +/- 0.5% FS
Outputs
Control.................................4-20 mA, 500 ohms max.
Signal...................................4-20 mA, 500 ohms max.
Alarm...................................SPDTRelay, 0.5 amps max.
Communications.......................RS-485, 2-wire

 

 

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