Labconco TXE Tall XPerEnclosure 3892022 - Manual (Page 33)

Chapter 6: Maintaining Your TXE
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Guardian Digital 1000 Airflow Monitor
Option
Refer to Figure 6-3 for operation and calibration. Refer to the separate Labconco
1000 Alarm Manual for detailed information.
Operation
The Guardian Digital Airflow Monitor consists of the airflow sensor, the Alarm Unit,
and the 15 VDC power supply. For 115V operation the alarm unit is powered by
plugging the power supply into the factory-prepared digital airflow monitor socket.
For 230V operation, the Alarm Unit is powered by plugging the power supply into a
building outlet. The alarm has “Enter,” “+,” and “-” buttons to program the monitor.
There is also a green LED “SAFE,” yellow LED “CAUTION,” and red LED “LOW”
with audible alarm for airflow conditions. The audible alarm can be permanently
muted if desired. The Guardian Digital 1000 Airflow Monitor displays a face
velocity value, provides an RS232 communications port to a PC or building computer
system, can be configured for external input connections such as night setback or
external alarm and provides up to three output relays that can be configured. For
complete detailed information, please refer to the separate Labconco 1000 Alarm
User’s Manual provided with the enclosure.
Calibration
The TXE comes factory calibrated with the monitor alarm at 60 ± 10 fpm with the
inflow velocity set at 90± 10 fpm.
Programming the Guardian 1000 Digital Alarm
Set the desired face velocity of the enclosure with the doors closed using an
average face velocity of readings from a thermal anemometer.
Configure Alarm
To successfully calibrate the airflow monitor, it will be necessary to change the
face velocity by adjusting the airflow exhaust volume. The exhaust volume can be
adjusted using the speed control located behind the front panel on the TXE.
The following inflow face velocity speeds are recommended to successfully
calibrate. To begin, determine what the low airflow, low warning airflow, normal
airflow, and high airflow shall be.
Low Air Alarm
Set Point
(user defined)
Enclosure
Operating
Inflow Speed
Low Calibration
Set Point
(user defined)
High Calibration
Set Point
(user defined)
60 – 70 fpm 80 fpm 50 – 90 fpm 100 – 150 fpm
80 - 90 fpm 100 fpm 50 – 110 fpm 100 – 170 fpm
NOTE: ENTER button stores information
+/- Buttons allow for scrolling.