Model 306 Ozone Calibration Source Manual Rev. G-1
18
7.
USING THE MODEL 306 TO CALIBRATE AN OZONE MONITOR
7.1
Flow Requirement
The flow requirement of your ozone monitor must be less than the output capacity of
the Model 306 Ozone Cal Source
™, which is about 4 L/min.
7.2
Attaching the Ozone Cal Source
™ to an Ozone Monitor
7.2.1 Overview
For calibration of an ozone monitor, tubing may be attached from the ¼-inch stainless
steel Swagelok outlet fitting on the back of the Model 306 Ozone Cal Source
™, to the
inlet of the ozone monitor. The tubing should be made of PTFE (Teflon
), PFA, or
some other inert material that does not destroy ozone and that does not desorb
plasticizers and other organics that can contaminate the flow path. The length of
tubing should be kept as short as possible (not more than a few feet) to minimize
ozone destruction. Tygon
, polypropylene (which may look like Teflon
), and metal
tubing should not be used. Teflon-lined Tygon
tubing, which is supplied with the
instrument and is available from our online store (
), provides the flexibility of Tygon
and the inertness of Teflon
.
The Model 306 Ozone Cal Source
™ may be attached directly to the ozone monitor;
excess ozone flow will be diverted through an ozone scrubber internal to the Model
306, and any perturbation in total flow rate will be automatically adjusted by the
microprocessor using feedback from the mass flow meter of the Model 306.
7.2.2 Installation of the Model 306 on a Sampling Line
A 3-way valve inside the Model 306 OCS
TM
can be set so that air from a sampling inlet
on the back of the instrument bypasses the Model 306 and is routed to the user’s
ozone monitor or system. When the Model 306 OCS
TM
is turned off, or in hibernation
mode (discussed in Section 5.3), the valve is set so that air is routed from the
sampling inlet. This permits the user to leave the Model 306 OCS
TM
plumbed in-line
with their ozone monitor or other system when the Model 306 is not in use.
Model 306 Output to
User’s Ozone Monitor:
O
3
Calibration Air
or
Sample Air from Inlet
Sample Air
Inlet
