Teledyne API Model 401 O
3
Photometric Calibrator Instruction Manual, 01124, Rev. J2
3.5 Summary Of Front Panel Calibration Controls
The calibration controls are summarized below in terms of the button sequences used to access
them.
Table 3-1: Calibration Controls
Button Sequence Function Default Limits
STBY Select stand by mode - -
ZERO-ENTR Begin zero calibration - -
O3GN-ENTR Begin span calibration - -
ASEQ-ENTR Begin multi-point calibration - -
SETUP-WAIT Zero/span/duration 15 min 1-20 min
SETUP-EVNT-TIME Auto check time-of-day 23:30 00:00-23:59
SETUP-EVNT-ASEQ En/disable auto multi-point check OFF OFF/ZS/Z2S/Z5S
SETUP-EVNT-SHFT Auto check time shift 0 min
SETUP-MISC-O3-
GEN-MODE
Select lamp control mode Bench
± 60 min
CNST/REF/BNCH
3.6 Photometer Calibration
Model 401 is capable of accurately reproducing O
3
span gas. However, it should be
quantitatively verified by relating to a master standard such as certified Model 400 O
3
photometric analyzer. The calibration of Model 401 photometer can be verified by periodic
(recommended every 3 months) intercomparison between Model 401 photometer and a master
standard.
Photometer Zero Calibration
1. Turn the power on for both Model 401 and Model 400 (as master standard) and allow them
to stabilize for minimum of one hour.
2. Start to generate the zero gas by pressing "zero" button from the main menu and enter the
password (512). In case of using external dry zero air, verify proper IZS flow and pressure of
external air source. (See Figure 1-5 for pneumatic connections.)
3-3
