Alnor AirGard^® 335 Fume Hood Monitor

The AirGard 335 continuously monitors fume hood face velocity by measuring the air velocity of clean air from the room passing through the air inlet on the front of the monitor. The monitor then reports this information through readily understandable means to the user. An electronic bargraph moves back and forth through universally recognized red (danger), yellow (caution) and green (safe) colored zones as the velocity changes. Corresponding large colored lights also illuminate. A continuous audible alarm alerts of a dangerous situation when the face velocity is in an alarm condition. This information can be sent to other personnel in a remote location by means of a dry contact relay output. A digital display can be enabled to view velocity quantitatively. The monitor mounts flush to the fume hood surface and fits into a single electrical receptacle box knock-out.

Specifications
Digital Display 3 digit, 7-segment liquid crystal display with status indicators and icons. Electronic bargraph moves back and forth through colored zones as the velocity changes.
Display Units If digits are enabled, velocity is represented in feet per minute (fpm) or meters per second (m/s). User selectable through menu.
Display Range 50 to 250 fpm (.25 to 1.27 m/s). Over range measurements shown as Hi. Under range measurements shown as Lo.
Resolution 1 fpm or .01 m/s.
Accuracy ±10% or 10 fpm, whichever is greater.
Alarm Range 50 to 250 fpm (.25 to 1.27 m/s).
Alarm Delays User configurable through menu from 0 to 255 seconds.
Audible Alarm Indication 85dB @ 4 inches (10 cm).
Horn Silence Temporary & permanent.
Night Set back Monitor can be disabled remotely.
Visual Alarm Indication Jumbo red LED for low flow and high flow alarm zone.
Visual Warning Indication Jumbo yellow LED for low flow and high flow warning zones. Warning offset is configurable through menu.
Visual Normal Indication Jumbo green LED for normal flow zone.
High Flow Alarm Disable Audible, visual and relay disable.
Alarm Relay Output Nominal switching capacity 1A @ 30V DC, .5A @ 125V AC, form A relay.
Emergency Purge Button on front of monitor activates a relay that can be used to command the fume hood damper to full open until pressed again. Nominal switching capacity 1A @ 30V DC, .5A @ 125V AC, form A relay.
External Alarm Input Intermittent audible and LCD status indicator indicate external alarm.
Sash Override Alarm Input Audible and LCD status indicator indicate the sash position switch has been tripped.
Calibration Two point field calibration required.
Instrument Dimensions
Front Faceplate 5.25L x 3.0W x 5/8D inch (13.3L x 7.6W x 1.6D cm).
Rear Enclosure 3.0L x 2.0W x .5D inch (7.6L x 5.0W x 1.3D cm).
Mounting Flush. (3.0L x 2.0W inch cut out required on hood surface).
Monitor fits into a single electrical receptacle box knock-out.
Operating Conditions 55 to 86°F (13 to 30°C), 5% to 95% RH, non-condensing.
Storage Temperature -40 to 150°F (-40 to 65°C), 5% to 95% RH, non-condensing.
Power Requirement 9 to 30V AC/DC. (Wall plug in power supply supplied for domestic units).

The calibration and configurable parameters are stored to nonvolatile memory of the instrument and are not lost when the monitor loses power.