Gas Connections - Teledyne 3000MA Operating Instructions Manual

Percent Oxygen Analyzer

3.3.1 Gas Connections

It is recommended that a gas filter be located upstream of the 3000MA
to prevent sensor or restrictor contamination. A 0.5 micron filter should be
suitable.
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 (1 to 15 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). Use the restrictor without the blue dot sticker in the same manner
for low pressure applications (less than 1 psig).
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:
Figure 3-3: Rear Panel of the Model 3000MA
Operating the unit without restrictors can cause damage to
the sensor due to excessive flow rates.
Teledyne Analytical Instruments
Installation 3
3-3