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9.8 Fuses
The in-line fuse installed on the 24 VDC power circuit of the peristaltic pump
and temperature controllers is only to be replaced by trained service personnel.
Replace the AC power fuse in the power entry module only with 5AH, 250V, 5x20mm type
fuses.
9.9 Inorganic Denuder Rejuvenation
The two annular glass denuders (URG-2000-30-242-3CSS) are coated with one of two
solutions for the removal of potentially interfering acidic and basic gases.
For the removal of the acids (nitric, nitrite, sulfur dioxide, acetate, HCl, formic and oxalic
acid), a coating solution is used containing 2% sodium carbonate in a solution of 500 ml
deionized water, 20 ml of glycerol, and 750 ml of methanol.
For the removal of bases (ammonia), phosphoric acid is substituted for the sodium car-
bonate in the solution mixture described above. At a flow rate of 15 lpm, the denuders
are typically changed-out after 1 week of continuous operation. Monitoring concentra-
tions of ammonium and nitrate in PILS zero-air samples will provide an indication of
the need to rejuvenate the denuders.
To rejuvenate the denuders follow the following procedure:
1. remove the denuders from the sample inlet
2. remove the aluminum denuder bodies from the teflon end caps with fittings
3. wash four solid denuder end caps
4. install one solid end cap on each denuder
5. fill each denuder with MilliQ water, install the other cap and rotate the denuder
(30 times over 1 minute) to allow the water to wash the inside surfaces
6. undo the caps and empty the water from the denuders
7. repeat the last two steps 3 times with MilliQ water and then 3 times with clean
Methanol
83-00009-01A
PILS 4001-115V and 4001-230V
9.8 Fuses
Page 64 of 74
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