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Teledyne API Model 401 O
3
Photometric Calibrator Instruction Manual, 01124, Rev. J2
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.
Detector Pre-Amp or V/F Failure
The O
3
REF test value of less than 75 MV usually indicates a failure of the Detector Pre-Amp.
Confirm that the V/F is operating properly as described in Section 9.6.3. If the V/F check is
successful, the Detector pre-amp has failed and should be replaced.
9.6.7 Checking Main Switching Valve
Proper operation of the main Switching Valve can be determined by performing the following
procedure:
1. Press Zero to generate the Zero gas and allow the analyzer to stabilize.
2. Observe the O
3
REF Test Function and make a note of its value.
3. Press span to generate approximately 400 ppb concentration and allow the analyzer to
stabilize.
4. Observe the O
3
REF Test Function and note its value.
If the O
3
REF value has decreased by more than 5 MV from its value with Zero-gas, then there is
a "cross-port" leak in the main switching valve. (NOTE: If desired, this check can be performed
using Ozone concentrations higher than 400 ppb. In this case, the drop in O
3
REF (in MV)
should be no greater than 5 x Actual Concentration/400.)
9.6.8 Checking The Lamp Power Supply
A schematic and physical diagram of the Lamp Power Supply are shown on drawings 01217 and
01218 in Appendix D.
It is not always possible to determine with certainty whether a problem is the result of the UV
Lamp or the Lamp Power Supply. However, the following steps will provide a reasonable
confidence test of the Lamp Power Supply.
9-16