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3 Installation
3.4
Installing the Micro-Fuel Cell
The Micro-Fuel Cell is not installed in the cell block when the
instrument is shipped. It must be installed before the analyzer is placed in
service.
Once it is expended, or if the cell is exposed to air for too long, the
Micro-Fuel Cell will need to be replaced. The cell could also require replace-
ment if the instrument has been idle for too long.
When the micro-Fuel Cell needs to be installed or replaced, follow the
procedures in chapter 5, Maintenance, for removing and installing cells.
3.5
Gas Connections
Before using this instrument, it should be determined if the unit will be
used for pressurized service or vacuum service and low pressure applica-
tions. Inspect the restrictor kit that came with the unit. The kit consist of two
restrictors and a union for 1/4" diameter tubing. Notice that the two 1 3/4"
long, 1/4" diameter tubing are restrictors. It has an open end and a closed
end with a small circular orifice. The restrictor without the blue sticker is for
low pressure and vacuum service. For high pressure (5 to 50 psig) applica-
tions, use the restrictor that has a blue sticker on the body.
For pressurized service, use the restrictor with the blue dot and union
from the restrictor kit and attach it to the Sample In port. The small circular
orifice should face away from the back of the unit (against the direction of
gas flow). For positive pressures less than 5 psig, use the restrictor without
the blue dot sticker in the samplein line in the same manner.
For vacuum service (5-10 in Hg), use the restrictor without the blue dot
sticker and union but attach it to the Exhaust Out port. The small circular
orifice should face toward the back of the unit (against the direction of gas
flow).
Remove the blue sticker from the restrictor before using.
WARNING: Operating the unit without restrictors can cause
damage to the micro-fuel cell.
Figure 3-10 is an illustration of the Gas Connector Panel. The connec-
1
tors are
/
inch tube fittings. Optional gas connections are shown in a shaded
4
block.
For a safe connection:
1. Insert the tube into the tube fitting, and finger-tighten the nut until
the tubing cannot be rotated freely, by hand, in the fitting. (This
may require an additional
3-12
1
/
turn beyond finger-tight.)
8
Teledyne Analytical Instruments
Model 3000TB
`
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