Assortment / System Description

Room pressurization and fume hood control
Fume hood
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21.9.4 Fume hood and ODP interaction
The fume hood controller communicates with a hood user through the
Operating Display Panel (ODP). The ODPs are networked PL-Link devices. The
primary purpose of the ODP is to indicate to the user that the hood is or is not
drawing the proper air flow rate. The Fume Hood Flow Alarm state is the data
used to indicate sufficient flow. The ODP indicates the alarm state through
three media:
● Text displayed on screen (QMX3.P87)
● Red, yellow, green indicator lights
● Horn
The Horn Silence Button lets a hood user silence the horn temporarily.
The Emergency Button on the QMX3.P87 lets a user call for a high flow rate in
special circumstances that should be defined by the safe operating procedures
for the laboratory.
The ODP supports a rich set of secondary features that can be applied where
they are needed.
● Numerical display of flow or velocity
● Light switch
● Sash closer
● Manually select air flow or velocity
● Prevent scheduled mode change (QMX3.P88)
● Indicate over use of exhaust system capacity
● Indicate high exhaust flow temperature (according to EN 14175 Part 7)
● Energy Efficiency feature (Green Leaf)
● Alert user to excess sash opening
Additional ODP
Features