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3.4.2. Service Connections
The service connections on the top of the FlightDAQ2 cover the supply gas, purge gas, calibrate
and reference ports. These connections can be made either by 1/8” Swagelok compression fittings
or Chell AS205 quick disconnects. These fittings can be interchanged as they both mate with the
M5 feature in the top plate.
Port
Description
Supply
Supply pressure for the internal
shuttle valve
Clean, dry gas with a pressure 7 to 8 bar
gauge.
Purge
Purge supply pressure
Clean, dry gas with a pressure 7 bar gauge.
Care must be taken if the purge pressure
exceeds the pressure range of the
scanner.
Calibration
Calibration source for calibrating
the FlightDAQ2
Clean, dry gas with a maximum differential
pressure (relative to the reference pressure)
equal to the differential range of the scanner.
Reference
Reference for pressure
measurement
Reference pressure (usually left open to
atmosphere).
Maximum positive or
negative gauge pressure applied to the
reference must not exceed the full-scale
pressure of the internal scanner.