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Model OT-2 System Operation 3
3-7
Teledyne Analytical Instruments
The span gas cylinder must be equipped with a pressure
regulator with a metallic diaphragm. The regulator should be set to
approximately 3-5 psig. Rotate the selector valve (a) to the span
position and observe the flow meter (b) which should indicate a
flow of about 0.4 scfh. For calibration purposes the flow can be
increased to as much as 1 scfh in order to reduce the time re-
quired to stabilize.
Allow the span gas to pass through the O
2
sensor until the
reading has stabilized (approx. 10 min.). The O
2
transmitter can
then be adjusted (see instructions elsewhere in this section) to
match the analyzed content of the span gas. When the calibration
is complete, return the selector valve (a) to the sample position
and readjust the flow valve (c), (if necessary) so that flow meter
(b) reads 0.4 scfh.
Figure 3-5 Sample System Component Locations