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.

Additional ODP Features

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

Description

Parameter

Default value

Value to display

1:Blank
2:Face velocity
3:Exhaust air volume flow
4:Exhaust level
5:Differential air pressure
▶ Alarms will still be displayed at the ODP if set to Blank.

DspyValue

2:Face velocity

Switch-on delay for sash opening alert
▶ The length of time after FhSashOpnAlrt turns on before the buzzer will start to beep. It is also the time after the buzzer silence is pressed in response to a sash open alert before the buzzer will start beeping again.

DlyOnSashAlrt

300 [s]

Enable sash tone

0:No
1:Yes
▶ Set to yes to allow the buzzer to be activated in the event of a sash opening alert or in the event of a sash maximum opening alert.

EnSashTone

0:No

Switch-off delay for sash maximum opening buzzer
▶ The buzzer will be immediately turned on in the event of a sash maximum opening alert. The buzzer will be automatically silenced after the time defined. The auto silence feature is disabled when DlyOffSshmBzz is set to 0.

DlyOffSshmBzz

0 [s]

Air velocity unit
▶ Defined by selected engineering unit – do not change.

AirVUnit

[m/s]
[ft/min]

Air volume flow unit
▶ Defined by selected engineering unit – do not change.

AirFlUnit

[m3/h]
[ft3]
[l/s]