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TELEDYNE INSTRUMENTS
460L Instruction Manual Calibration
05228 Rev B 41
DCN 5164 PRINTED DOCUMENTS ARE UNCONTROLLED
8. CALIBRATION
8.1. Zero Point calibration
Variations in ambient conditions, most notably changes in ambient humidity, and minor changes
in the performance of certain electronic components over time may cause slight offsets in the zero
point measurement of the monitor. To check for and compensate for these minor offsets use the
following procedure.
1. Supply zero air to the monitor by inserting a O
3
scrubber filled with activated charcoal into
the ozone supply gas line just before it enters the monitor.
A scrubber of this type is available from Teledyne Instruments
(Carbon Filter, DAU, 000 Grade; P/N FL0000020).
NOTE
Since variations in humidity is a common cause of these types of offsets, use of bottled
O
2
, which is extremely dry, as zero air is not recommended particularly in areas where
the ambient humidity is high.
2. Once the scrubber is installed, allow the monitor to operate until the O
3
reading stabilizes.
This may take approximately 15 minutes
3. Check the O
3
reading.
If the reading is within the repeatability specification of the monitor (see Section 2.1),
no adjustment is needed.
If the reading is higher than the repeatability specification of the monitor but still
relatively minor (10 to 20 ppb for example), press the two ZERO keys on the front
panel and hold them for 3 seconds.
If the offset is greater than 30 ppb or pressing the zero key has no effect, contact
Teledyne Instruments’ customer service department.
8.2. Span Point Calibration
1. Connect the M40M to a computer running a terminal emulation program such as Hyper-
terminal. See Section 3.7 for instructions.
2. Flow zero air, or pure O
2
through the analyzer and wait 15minutes.
3. After the analyzer has stabilized, perform a zero calibration by pressing both zero buttons
on the front panel at the same time.
4. Type:
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