AIRGARD
®
335 MONITOR SPECIFICATIONS
Digital Display
3 digit, 7 segment LCD with status indicators and
icons. Electronic bargraph moves 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 (0.25 to 1.27 m/s). Over range
measurements shown as Hi. Under range
measurements show as Lo.
Resolution
1 fpm or 0.01 m/s.
Accuracy
±10% or 10 fpm, whichever is greater.
Alarm Range
50 to 250 fpm (0.25 to 1.27 m/s).
Alarm Delays
User configurable from 0 to 255 seconds.
Audible Alarm Indication
85 dB at 4 inches (10 cm).
Horn Silence
Temporary and permanent.
Night Set Back
Monitor can be remotely disabled.
Visual Alarm Indication
Large red LED for low flow and high flow alarm
zones.
Visual Caution Indication
Large yellow LED for low flow caution zones.
Caution offset is configurable through menu.
Visual Normal Indication
Large green LED for normal flow zone.
High Flow Alarm Disable
Audible, visual, and relay disable.
Alarm Relay Output
Nominal switching capacity 1A at 30 VDC,
0.5A at 125 VAC; form A relay.
Emergency Purge
Button on front of monitor activates a relay that can
be used to command the fume hood damper to
open fully until pressed again. Nominal switching
capacity 1A at 30 VDC, 0.5A at 125 VAC, form A
relay.
External Alarm Input
Intermittent audible and LCD status indicate
external alarm.
Sash Override Alarm Input
Audible and LCD status indicators indicate the
sash position switch has been tripped.
Calibration
Two point field calibration required.
Instrument Dimensions
Front Faceplate — 5.25 (L) x 3.0 (W) x 5/8 (D)
inches (13.3 x 7.6 x 1.6 cm);
Rear Enclosure — 3.0 (L) x 2.0 (W) x 0.5 (D)
inches (7.6 x 5.0 x 1.3 cm).
Mounting
Flush, 3.0 (L) x 2.0 (W) inch (7.6 x 5.1 cm) cutout
required on hood surface.
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 30 V AC/DC. Wall plug in power supply
supplied for US and Canada.
The calibration and configurable parameters are stored in the non-volatile memory of
the instrument and are not lost when the monitor loses power.
