Model 420 & 425 Flame Photometer
425 91 001
Issue 22
1
st
December 2016
ECN 1410 & 1932
- 22 -
Installation
continued
2.4
Assembly
continued
Figure 2.4
Filling the ’U’ tube
Wash bottle, 2. Constant head & drain, 3. ‘U’ tube, 4. Drain tube, 5. Spring Clip
8
Fit the constant head & drain (Gas Trap) on the two retaining screws (see
below). Fit the drain tubing (400 22 002) (item 4, figure 2.4) to the outlet on
the constant head and drain. If necessary connect a suitable length of tubing
(not supplied), to extend the drain tubing to carry waste to a sink or other
drain receptacle. The downward flow of waste must not be restricted.
9
Make sure that the constant head and drain is pushed fully down on its
mounting screws. Use a wash bottle (item 1, figure 2.4) to fill the 'U' tube with
deionised water. Sufficient water should be used to purge the tube of air.
Allow excess water to flow back into the drain.
IMPORTANT
Do not continue until you are satisfied that the 'U' tube has been
completely filled with water, and is purged of air.
