The Airflow Monitor is installed directly onto the exterior of the device which it is monitoring fume hood or BSC. For fume hood applications, a small probe is provided, which is installed on the interior sidewall of the hood. This probe is connected to the Airflow Monitor using very small tubing (1⁄4” O.D.; also provided). For BSC applications, a duct static pressure probe is used in lieu of the sidewall probe and is installed into the exhaust duct serving the BSC.

The Airflow Monitor measures airflow by drawing an extremely small amount air from the room through the front reference port, through the internal air flow sensor and exits through the sidewall probe or static pressure probe. The airflow measured by the sensor is proportional to the fume hood face velocity and the BSC duct static pressure. If at any time the velocity drops below the calibrated alarm set point, the Airflow Monitor goes into full alarm mode (audible alarm sounds, mute button is initialized, red LED flashes and the alarm relay changes state). The alarm may be silenced by pressing the mute button. However, the red LED and relay remain the same until the alarm condition has been cleared.

The Airflow Monitor Velocity Alarm measures airflow velocity using an ultra-sensitive micro-bridge airflow sensor coupled with a high-resolution (24-bit) A/D converter. The resulting digital airflow measurement is extremely accurate, precise and repeatable. The alarm set point is programmed using a simple one-step operation which calibrates and stores data into the microprocessor’s non-volatile memory. The microprocessor continually compares the real time measured airflow to the programmed alarm set point. When the measured airflow is greater than the calibrated alarm set point, the green LED is illuminated to indicate normal operating conditions. When the measured airflow is less than or equal to the calibrated alarm set point, the unit goes into alarm mode alerting the lab occupants of a potentially unsafe condition.

• Red LED flashing will be displayed when the sash is raised above the maximum safe   
   working opening, Red LED (not flashing) indicates low airflow an audible alarm sounds.

• Night set back, when the night set back is activated the audible alarm will be muted and
  the Green LED will flash on/off.

• Unit is mounted on the face of the fume hood side wall at a convenient viewing height.

• 2 Relay units configure able as ( Night Setback / Sash High )

• 1 Relay output for low air alarm

• Com Port RS232 for connections to a Laptop or PC for diagnostics

• Power Supply - Low voltage DC power supply 15V DC. Monitor is supplied complete
   with a plug in type power supply for connection to a single gang socket. The main
   supply should be fused 3A.

• Air Flow Sensor- Monitor is supplied with a remote type air flow sensor and has a
   plug in RJ11 socket on the rear of the case to accept the sensor cable

• Vent - can be supplied for connection to the Fume Hood inner side wall, consisting
   of M1 of 25mm vent tube, a 25mm bush and coupling and box lid

• Sensor Cable- standard length of remote type sensor cable is 2M, a 5M version is
   also available. Custom sizes can be supplied.

• Visual screen displays the air flow velocity or air flow status ( Air Safe / Air Fail)

• Audio Visual Alarm, an Audible alarm with Red, Amber & Green LEDs

• Password protected push button set-up and calibration menus with on screen instructions

• Unit is mounted on the face of the fume hood side wall at a convenient viewing height.

• 3 Relay units configurable as (Night Setback/ Alarm Disable/Sash Hig /External Alarm
   High Low )

• Com Port RS485 for connections to a Laptop for diagnostics and configuration of
   the monitor, or for connection via a local Modus RTU for remote logging with real time
   graphical displays using the AFA Network software or direct connection to a BMS system

• Power Supply - Monitor is supplied complete with a plug in type power supply for
   connection to a single gang socket. The mains supply should be fused 3A. A desktop
   style power supply can be supplied with flying mains lead for connections to a
   fused spur or terminals

• Vent - can be supplied for connection to the Fume Hood inner sidewall, consisting
   of M1 of 25mm vent tube, a 25mm Bush and coupling and box lid

• Sensor Cable- standard length of remote type sensor cable is 2M, a 5M version is
   also available. Custom sizes can be supplied.