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UV Source Lamp and Detector Diagnostics
O3 REF Value Meaning
4700 mV to 5000 mV The Source Lamp and Detector are
operating, but adjustment is required
4000 mV to 4700 mV The Source Lamp and Detector are
operating properly; no adjustment is
needed
2500 mV to 4000 mV The Source Lamp and Detector are
operating. Adjustment is useful but not
required
150 mV to 2500 mV The Source Lamp and Detector are
operating, but adjustment is required
90 mV to 150 mV Either the Source Lamp or the UV
detector is not functioning
Less than 90 mV The Detector Pre-Amp or V/F Board
has failed or is disconnected
TABLE 4.1 UV SOURCE LAMP AND DETECTOR DIAGNOSTICS
Adjustment required or Adjustment useful:
The first adjustment that should be made is to adjust the gain on the UV Detector
Preamp. The adjustment for the preamp is located through the preamp cover at the front
of the optical bench (See Figure 4.1). The preamp should be adjusted to 4500 mV +/-
100mV.
If the preamp cannot be adjusted to achieve this value, additional adjustment can be made
by rotating the lamp inside the lamp housing at the rear of the optical bench(See Figure
1.9.) To adjust the lamp, loosen the lamp set-screw on the top of the optical bench and
slowly rotate the lamp while observing the O3 REF value. Re-tighten the lamp setscrew.
FIGURE 4.1 - DETECTOR PREAMP ADJUSTMENT
P/N 02395D1 Teledyne API Model 450 O
3
Monitor Instruction Manual - Page 48