Hampshire Controls' "Air Flow Monitor" is a single probe instrument used for monitoring mass air flow levels within biosafety cabinets and laminar flow hoods. Besides monitoring, the unit also includes audible and visual alarm indication and an (SPDT) output for remote alarm indication.
Setup and operation video of the 'Air Flow Monitor' system (8 minutes)
For air flow indication a single, 5/16" diameter probe is used. Once it is inserted into the air flow appropriately (see video below), it will respond rapidly, accurately and repeatably. Once probe positioning has been accomplished, you only need to set the flow value to "just above" the acceptable desired audible alarm threshold. Then, should the flow rate drop to the set point level, a yellow indicator light will illuminate. If flow rate drops below the established set-point value (for ~10 seconds), a red status indicator light will begin to flash and an audible alarm will sound.
Nominal flow range for the standard configuration of this device is typically between 50 and 500 feet/minute for the low-range version. For the high range version it is 500-2500 feet/minute. Hampshire Controls standard version 'Air Flow Monitor" is intended for air temperatures between 18°C and 28°C. However, other temperature and flow range probes are available upon request.