Cermet II User’s Manual
Michell Instruments
9
INSTALLATION
2.6.1 Transmitter Mounting - Sample Block and Gas Connections (Optional)
Sample gas connections are made to the Gas In and Gas Out ports on the sample block
see
Figure 8. Either port on the sample block may be used as the Gas Input port (i.e.
for connection purposes the ports are interchangeable).
Normally, connections are made via stainless steel pipework, in which case the sensor
block/transmitter assembly will be self supporting. If Te
fl
on tubing is used it may be
necessary to support the assembly with a body clip.
1
1
2
2
3
4
5
3
4
5
6
1
2
3
4
5
Figure 8
Sample Block Gas Connections
Both the Input and Output gas connections are
⅛
” NPT. It is recommended that both
the Gas Input and Output connections are made made via
⅛
” NPT to 6mm or
⅛
” NPT
to ¼” stainless steel tube adaptors (2 to 5 -
Figure 8). The method of connection to the
sensor block (6) is as follows:
NOTE: The following description relates to 6mm tube
fi
xings. The sample
block ports are both
⅛
” NPT female process connections. Tube adaptors are
not supplied with the equipment but can be obtained by contacting your local
distributor or Michell Instruments (see www.michell.com for details).
1.
Cut a suitable length of 6mm (¼” U.S.) stainless steel tubing (1) to the
correct length and, if necessary, bend to shape to suit the location of the
sensor block assembly.
NOTE: To facilitate ease of connection to the
port, at least 75mm (3”) of the tubing coming out of the Gas In
port must be straight.
2.
Clean off any burrs or metal shavings adhering to the tubing.
3. Screw
the
⅛
” NPT (¼” U.S.) NPT Swagelok adaptor (5) into the
⅛
” NPT
(¼” U.S.) NPT inlet port in the sensor block (6) and tighten to a torque
setting of 35 Nm (25 lbf-ft).
4.
Pass the stainless steel tubing (1) through the locking nut (2).
NOTE:
Threads towards the gas port.
5.
Fit the back ferrule (3) over the stainless steel tubing (1) with the bevelled
end facing the back of the front ferrule (4).
6.
Place the front ferrule (4) over the stainless steel tubing (1), bevelled end
towards the adaptor (5).
