3.6
Target Plate Air Purge
The BB701 comes with a nitrogen air purge collar that surrounds the target
plate. When connected to a nitrogen gas source the target plate is kept free of
condensation at lower temperatures. Snow is likely to form on the plate when it
is kept at temperatures below freezing temperature. Snow or condensation will
change a target’s emissivity. This can lead to inaccuracies unless the infrared
pyrometer is corrected for this emissivity change.
It is therefore recommended that the user take advantage of this feature. Use
dry gas or Nitrogen with a dew point below –20°C (–4.0°F). The rate of gas inlet
should be 0.25 to 0.50 m
3
/hr. (5 to 10 ft
3
/hr.). Do not exceed the maximum gas
inlet rate. The port will accept any flexible tubing (vinyl, rubber, PTFE, latex)
with an 1/4" outer diameter, such as OMEGA
TM
#TYVY-1418-100-A.
BB701
3
3-6
