Hottes
DESCRIPTION
The fume hood monitor is used to notify the user if the hood is not safe to use.
WORKING PRINCIPLES
To have a air flow (velocity), a differential air pressure must be present.
Higher the pressure, higher the air velocity.
CALIBRATION
The fume hood monitor is calibrated for two specific points:
with the sash fully open (lowest velocity point) and
with the sash fully closed (highest velocity point).
SPECIFICATIONS
Measurement range ±125Pa
Accuracy 0.08 Pa
Span Accuracy 3%
Offset stability <0.05 Pa/year
Buzzer 80 Decibels
Intuitive Display
One button action
Easy calibration process
Easy installation
IN THE BOX
ATEK Transmitter with differential pressure module and display
Power supply
2’ silicon tubing
18” aluminum tube
Fastening Hardware
DEFINITIONS
Air flow : Flow of air or any other fluid is caused by a pressure differential between two points. Flow will originate from an area of high energy, or pressure, and proceed to area(s) of lower energy or pressure.
Air velocity : Air velocity (distance traveled per unit of time) is most often expressed in feet per minute (FPM). In a hood, we want the air to move fast enough to catch fumes with it and keep the environment safe.
INSTALLATION
Install the tube mount with Epoxy inside the hood on the wall behind the sash
The opening end of the tube must located at 100 mm from the sash at working height
Place the transmitter with magnet beside the window
Plug the power supply from hood the electric outlet to the transmitter
Power On the transmitter
Proceed with the calibration process
The monitor is ready to use
AIRFLOW MONITOR ARE REQUIRED
Per ANSI Z9.5-2012, Section 8.10:
“All Hoods and exposure control devices shall be equipped with a flow indicator, flow alarm, or face velocity alarm indicator as applicable to alert users to improper exhaust flow.”
Per NFPA 45-2015, Section 7.8.7:
“A measuring device for indicating that the hood airflow remains within safe design limits shall be provided on each chemical fume hood… The measuring device for hood airflow shall be a permanently installed device and shall provide continuous indication to the hood user of adequate airflow and alert inadequate hood airflow by a combination of an audible and visual alarm. Where an audible alarm could compromise the safety of the user or the research, alternative means of alarm shall be considered.”
Per 29 CFR 1910.1450, Appendix A, OSHA Laboratory Standard:
“. . . . each hood shall have a continuous monitoring device to allow convenient confirmation of adequate hood performance before use. If this is not possible, work with substances of unknown toxicity should be avoided or other types of local ventilation devices should be provided… chemical hoods should be maintained, monitored, and routinely tested for proper performance.”
Per Prudent Practices, Section 9.C.2.4:
“Make sure that a continuous performance monitoring device is present, and check it every time the chemical hood is used.”
Per SEFA-1, Section 4.1.10:
“All hoods shall have some type of monitor for indicating face velocity or exhaust flow verification. The monitor can be a simple pressure gage connected to a Pitot tube in the exhaust duct, one of many electronic monitors, or a vaneometer. Regardless of the monitor installed, it should provide clear indication to the hood user whether exhaust flow or face velocity is within design parameters. A ribbon taped to the bottom of the sash is not acceptable.”
RÉTROFIT D'UNE HOTTE EXISTANTE
Le transmetteur de pression ATEK peut s'installer sur le circuit (tuyau) de vacuum de la hotte afin de mesurer la pression et déduire la vélocité de l'air.
Avantage
Le point de mesure est le même que le manufacturier.
Installation interne et intégrée, ce qui fait moins de chose à nettoyer dans une aire stérile.
Désavantage
Le transmetteur ne peut pas alerter directement les utilisateurs de la hottes, l'alarme audible et visuel doit provenir de la hotte.
