3B Scientific Critical Point Apparatus - Manual

3B SCIENTIFIC® PHYSICS
1
Critical Point Apparatus 1002670
Instruction sheet
02/13 MH/JS
5
17
18
19
22 1 2 20 21
8 7 6
23
9 11 12 13 15 16 14
3 4
1 Vernier
scale
2 Fixed scale
3 Grease nipple
4 Threaded bush
5 Handwheel
6 Base
7 Frame
8 Threaded axle with piston
9 Piston
cover
10 Outlet for thermal medium
11 Inlet for thermal medium
12 End plate
13 Cylinder
14 Conical seal
15 Measuring cell
16 Valve plate
17 Regulating valve
18 Gas connection fittings 1/8"
(for Minican® gas container)
19 Flush valve
20 Hole for thermocouple
21 Heat casing
22 Safety valve
23 Manometer (excess pressure indicator)
1. Contents of instruction manual
On delivery, the critical point apparatus is filled with
hydraulic fluid. The test gas is not included.
Before filling with the test gas, carry out a volume
calibration, as described in chapter 6, using air as an
approximation of an ideal gas.
Filling with the test gas is described in chapter 7.
Experimental investigations are described in chap-
ter 8.
Important notes on storage of the test gas and
equipment (if not in use for a long period) are stated
in chapter 9.
Owing to the inevitable diffusion of the test gas
through the conical seal, it is necessary to degas the
hydraulic fluid in the equipment, as described in
chapter 10. This must be done before the equipment
is put away for storage (after removing the test gas) or
if it has been in use for a long time.
The threaded bush in the frame must be lubricated
regularly and also inspected at lengthier intervals.
Refer to section 11 for instructions.
Maintenance work as described in chapter 12 is only
required if the rubber components get worn out and
their functionality is adversely affected.