Model 106-H Ozone Monitor Manual Rev. D-2
6
3.2.3
Connections to the Instrument
Inlet tubing may be attached to the ¼ inch stainless steel Swagelok fitting on the back
of the instrument. For the high concentrations of ozone typically used with the Model
106-H Ozone Monitor, stainless steel tubing is recommended.
3.2.4
Operating Parameters
The Ozone Monitor has an internal pressure relief device that protects the instrument
from excessive pressure. The device vents through an ozone scrubber when the inlet
pressure exceeds 50 psi and is not meant to be used in normal operation. Although
the ozone scrubber is made with an ozone destroying catalyst that has very high
ozone capacity, it may not scrub 100% of the ozone if the flow exceeds several liters
per minute. Operators of the instrument should not rely on the pressure relief device
as a pressure regulating device or expose the instrument to pressures above 50 psi.
Although the instrument compensates for temperature drift, if strong temperature
fluctuations are expected, the instrument should be placed in a thermally insulated box.
3.2.5
Checking the Zero Offset
Check the zero measurement occasionally, or if the instrument has not been used
recently. The zero offset of the instrument can be measured by first purging the
instrument with zero gas at a minimum flow rate of 0.2 L/min for at least 2 minutes.
For an accurate measurement, the instrument must have been turned on long enough
for the internal temperature to stabilize. The observed offset can be corrected for by
running the auto-zeroing function, as described in Section 3.10 of this manual.
3.2.6
Summary of Operating Recommendations
Operating Recommendation
Frequency
Manual
Section
Allow ~20 minutes for instrument
warmup before taking data
Each startup
3.2.2
Pressure should be below 50 psig
Each use
2, 3.2.4
Flow rates should be below 55 L/min
Each use
2
Inlet tubing should be made of
stainless steel
Each use
3.2.3
Check the zero offset
Occasionally or if not used
recently
3.2.5, 3.10, 6
Perform multipoint calibration
•
Annually
•
Any time major
disassembly of
components is performed
•
Any time the zero or span
checks give results outside
of the acceptable limits
1.2, 5
If strong temperature fluctuations are
expected, place the instrument in a
thermally insulated box
User-defined
3.2.4
