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If it is not possible to achieve an acceptable O3 REF test Value by means of adjustment,
it is possible that the lamp has deteriorated beyond its useful range and should be
replaced.
Lamp or Detector Failure:
WARNING
UV LIGHT PRESENT
DO NOT LOOK DIRECTLY AT THE UV LAMP SINCE UV
LIGHT COULD CAUSE EYE DAMAGE. ALAWYS USE UV
FILTERING GLASSES OR VIEW THROUGH GLASS.
A O3 REF value of approximately 125 mV usually indicates a total failure of either the
source lamp or the detector. To determine which component is at fault, remove the top
cover of the optical bench and observe the "lamp end" of the glass absorption tube. If a
blue-white light is visible, the lamp is operating and the detector is at fault and should be
replaced. If no light is visible, the UV lamp should be replaced. Please contact Teledyne
API for obtaining replacement parts.
NOTE
In cold ambient conditions, it may require 5 to 15 minutes of
warm-up before the source lamp initially fires. Be sure to wait for
this period before troubleshooting the lamp/detector.
5.3 Changing the analog output range
5.3.1 Voltage output
Output voltage ranges are set by DIP switches on the V/F board. To change the range for
the analog output:
1. Turn off instrument power
. Remove instrument cover. Locate the V/F board
near the front of the analyzer using Figure 1.9.
2. Locate switch S1, along the top edge of the card. Select the desired range per
Table 4.2 below.
3. Recalibrate the ADC as described in Section 5.4.
P/N 02395D1 Teledyne API Model 450 O
3
Monitor Instruction Manual - Page 49