Fuji Electric ZFK8 Instruction Manual page 12

3. PIPING
a spanner after it cannot be turned any more by hand.
Joint for calibration gas:
3.2 Piping of reference gas inlet
body.
installation method of piping.
the piping length as short as possible.
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CAUTION
Main body
(calibration gas inlet)
(1) Coupling
(3) Frount ferrule
(4) Back ferrule
(2) Nut
ø6mm or ø1/4inch teflon
tube for piping
- 1 Packing
2 Reference gas inlet