Thermo Scientific Mercury Freedom 80i, Manual

Page: 71 / 104

Thermo Fisher Scientific Mercury System Manual 6-1
Chapter 6
Optional Equipment
The Mercury System is available with the following options:
●
“Mercuric Chloride Generator” on page 6-1
●
“Hydrator” on page 6-1
●
“Zero Air Supply” on page 6-7
●
“Nitrogen Generator” on page 6-7
The TFS Mercuric Chloride Generator (oxidizer) uses a patented process
by which chlorine gas is mixed with elemental mercury (
Figure 1–6
). This
mixing is done a short distance from the probe injection point to help
minimize contact of mercuric chloride with cold spots. Mercuric chloride
(HgCl
2
) will adsorb or react on any "cool" surface (below 190
°
C). The
chlorine is supplied by a small cylinder (900 ppm Cl
2
in N
2
Balance), and
the elemental mercury is supplied by the Model 81 i elemental Hg
generator
An oxidized mercury source is required in order to comply with 40 CFR
Part 75 which states that a system integrity test needs to be performed once
a week.
The Hydrator humidifies calibration gas, improves system response, and
provides more complete recovery (
Figure 1–8
).
Use the following procedure to install the Hydrator.
Remove CDA to system by closing the air handling inlet valve on the side
of the rack. Monitor pressure gauge on the regulator assembly and proceed
when pressure drops to zero psi.
Mercuric Chloride
Generator
Hydrator
Hydrator Installation
System Preparation