Honeywell 4022, System Manual

Page: 223 / 239

Scanner Maintenance Heads and sensors
Figure 9-12 Head Air Purge
9.9.4.2. Maintaining head internal temperatures
Check head temperatures daily on the User Station. Head internal
temperatures are preset at the factory. This temperature should hold
constant between 38
°
C (100
°
F) and 49
°
C (120
°
F), and, most importantly,
vary less than
±
1
°
C (1.8
°
F). Under most conditions, the ideal internal head
temperature is 40
°
C (104
°
F). When the temperature rises above limits that
are preset in the Precision Platform software, the scanner automatically
sends the heads offsheet.
Both head enclosures use coolant to cool the sensor platform, and both use
an ECU to cool the internal air temperature. A trim heater is also used in
each head to maintain an elevated minimum air temperature when the
heads are offsheet. The trim heaters also help to stabilize the internal air
temperature.
To maintain the system:
1. Check head temperatures daily on the User Station. The
temperature should be between 38
°
C (100
°
F) and 49
°
C (120
°
F).
p/n 6510020208 10/18/07
9-47