Data Sheet for Product

Page 2 of 4 Siemens Industry, Inc.
Description
The VAV Fume Hood Controller consists of the
following components, which are required for each
fume hood:
• Fume Hood Controller
• Operator Display Panel and Cable
• Sash Sensor Kits (Vertical/Horizontal)
• Airflow Measurement and Control Options
For Pneumatic Damper applications you will need the
Pneumatic Fume Hood Exhaust Terminal, which
includes:
• #3 Pneumatic Actuator
• LAB AO-P Module.
• Velocity Pressure Transmitter
• Orifice Plate Airflow Sensor
• Single Blade Damper
For Electronic Actuation applications you will need the
Electronic Fume Hood Exhaust Terminal which
includes:
• Lab Electronic Damper Actuator Assembly
• Velocity Pressure Transmitter
• Orifice Plate Airflow Sensor
• Single Blade Damper or Venturi Air Valve
Controller
The Fume Hood Controller consists of a control circuit
board and metal enclosure. The enclosure may be
mounted directly on the exterior of the fume hood or
remotely on the laboratory wall or ceiling. The
controller circuit board is snap mounted inside the
enclosure and provides all wiring terminations for
input and output points, 24 Vac power, FLN trunk, and
the Operator Display Panel. A spare digital input and
output are provided for user applications such as
auxiliary sensors and alarms.
The control algorithms are pre-programmed. The
Fume Hood Controller is ready to begin operation
after selecting the proper application number defining
the network address, and appropriate setpoint and
control parameters using the laptop terminal. User
definable parameters include:
• Face Velocity Setpoint
• Alarm and Warning Limits
• Minimum Exhaust Flow
• Maximum Exhaust Flow
• Hood Sash Dimensions
• Control PID Gains
• Display Resolution
• Alarm Delay
• Emergency Setpoint
• Sash Open Area “Alert” for both
Attended and Unattended conditions
The controller uses the measured sash position and
the exhaust airflow to calculate the fume hood face
velocity using the equation:
Face Velocity = Exhaust CFM
Hood Open Area*
*Includes the sash opening, air foil and bypass area
The face velocity is compared to the face velocity
setpoint to calculate the required exhaust flow. The
controller modulates the damper using a floating
output to maintain the required exhaust airflow. VFD
and Venturi Air Valve applications include use of
calibration table and an analog output to take
advantage of the special flow control characteristics of
these devices. The fume hood controller performs this
control algorithm up to 10 times per second to ensure
maximum speed of response to changes in hood sash
upsets. Concurrently, the controller continually
monitors and updates all fume hood points including:
• Face Velocity
• High/Low Alarms
• Exhaust Airflow
• Sash Position
Controller Specifications
Power Requirements
Operating Range
Power Consumption
18-30 Vac, 50/60 Hz
4.0 VA (nominal) @ 24 Vac plus
actuator loads
Inputs
Analog
Digital
1 Velocity Pressure
Sensor (4-20 mA)
1 Spare (0-10 Vdc)
5 Sash position sensors
1 dry contact
Outputs
Analog
(0-10 Vdc)
Digital
(24 Vac optically
isolated solid state
switches @ 0.5A)
1 Exhaust Airflow Signal
1 Modulating for use with Venturi
or VFD, or Spare
1 Damper Actuator (2 DOs)
1 Spare
Package
Dimensions
Weight
6.5" H x 10.5" W x 3.0" D
(165 mm x 267 mm x 67 mm)
Approx. 3 lb. (1.35 kg)
Environmental
Storage Temperature
Operating Temperature
Operating Humidity
-40°F to 167°F (-40°F to 75°C)
32°F to 122°F (0°C to 50°C)
20% to 80% RH
non-condensing