A SAFE HOOD AS…
defined by the OSHA lab standard, prevents the escape of contaminants
above the permissible Exposure Limits (PELs) and Threshold limit
Values (TLVs) or, at a level that does not pose a health hazard.
The law mandates proper fume hood performance.
FACE VELOCITY MEASUREMENT
IS NOT GOOD ENOUGH. Face velocity is all about fume capture
and nothing about fume containment. Fume containment is all about
calculating the Reynolds-Average Navier-Stoke Equation, governing
unsteady, incompressible flows. Both physics and empirical testing
proves that containment is all about internal vortex development.
The ASHRAE-110 test proves that fume hood spill is cyclically not
a steady fume release. The precursor to a fume hood spill is the
collapse of this vortex. Room supply air distribution, supply air
temperature, room pressure, fume hood loading, usage and location
all impact fume hoods vortex at any face velocity. The extent that
these factors influence fume hood containment depends on the type
and brand of fume hood selected.
FOR THE FIRST TIME
THE USER HAS A "REAL TIME" PERFORMANCE INDICATOR.
Hood AlertTM utilizes our patented VFVTM
pressure transducer. Designed to measure the fume hood vortex pressure.
We supply the exact location for your hood where the vortex pressure
must be monitored. It's the next best thing to having an ASHRAE-110
performance tracer gas test operating full time. The worry of not
knowing what brand fume hood will be used, what face velocity is
correct, and how well the system is balanced for a particular hood
disappears. The Hood AlertTM provides that
extra degree of comfort to the employer/owner, hood user, Architect
SAFE AND ACCURATE. Our
signal is a direct measurement of what is happening in the hood.
Flow Safe's Hood AlertTM is uniquely qualified
to truly measure and control fume hood performance. The alarm mimics
the ASHRAE Tracer gas test, and provides instant hazard communication
when containment is compromised.
USER FRIENDLY. Calibration
and configuration programming is done through the tamper proof settings.
Menu driven programs guide personnel through setup and operation.
EASY TO UNDERSTAND.
Hood status is displayed on optional LCD display, and highly visible
LED's. When improper face velocity occurs, an audible/visual alarm
is triggered. Hazard communication is via a red flashing, LED and
an audible alarm signal. The audible alarm may be silenced, while
The red hazard light remains on until normal flow is restored. The
audible alarm automatically rearms once the conditions clears.
VERSATILE. The Hood AlertTM offers many
user selected functions. Every set-point (even caution) is independently
adjustable. Users can program units of measure, time delay and audio
alarm. The Hood AlertTM is available for
monitor only or monitor and control.
STABLE AND RELIABLE.
The Hood AlertTM is engineered to provide
overall system stability. The sensor is accurate over a wide range
of operating temperatures. Optional P,I,I/D (adaptive gain) control
circuit prevents hunting. The optional Dam tm actuator and REV tm
linear damper provides additional accuracy and stability. The Hood
Alert tm has a 2 year warranty, incorporates patented, state-of-the-art
technology, and is manufactured to industrial standards, including