Model 420 & 425 Flame Photometer
425 91 001
Issue 22
1
st
December 2016
ECN 1410 & 1932
- 50 -
Cleaning and Maintenance Procedures
continued
8.5
Six Monthly Maintenance
EQUIPMENT REQUIRED: -
As for weekly maintenance, plus the following: -
'U' tube and drain tube
Methanol
Tissues
Soft lint-free cloth
Cotton buds
1.
Carry out the Daily and Weekly Maintenance procedures.
2.
Clean the mixing chamber, burner tube, burner and constant head and drain
(see Section 8.7).
3.
Replace polythene nebuliser tube, 'U' tube and drain tube.
4.
Clean the optical filters and the glass chimney (see Section 8.8).
5.
Check the air and fuel tubing and connectors for leaks, using soap solution.
8.6
Nebuliser
EQUIPMENT REQUIRED: -
Stopwatch
10ml beaker
Cleaning wire
Cleaning Solution
Polythene inlet tube
8.6.1 Operational Check
1.
Turn off the fuel supply at source.
2.
Switch on the instrument and the air compressor. Check that the ‘flame on’
LED is off.
3.
Fill the beaker with deionised water, and weigh it.
4.
Present the 10ml beaker of deionised water to the nebuliser tube for an
accurately timed minute.
5.
Re-weigh the beaker and calculate the aspiration rate. If it is between 3 and
6g per minute, no further action is required.
If it is too low, continue with paragraph 6. If it is too high contact your
Sherwood Scientific Distributor.
Do not attempt to adjust the nebuliser as the capillary position is fixed
during manufacture, and is not adjustable.