
CALIBRATION PROCEDURES
Model 400E Ozone Analyzer
Instruction Manual
176
P/N 04316 Rev: B
7.5.
Manual Calibration Check with IZS or Zero/
Span Valve Options Installed
To perform a manual calibration check of an analyzer with an IZS Option installed,
use the following method.
NOTE
While the internal Zero Span Option is a convenient tool for performing
Calibration Checks, its O
3
generator is not stable enough to be used as
a source of Zero Air or Span Gas for calibrating the instrument.
Calibrations should ONLY be performed using external sources of Zero
Air and Span Gas whose accuracy is traceable to EPA or NIST
standards.
STEP ONE:
Connect the sources of Zero Air and Span Gas as shown below.
MODEL
400E
Sample
Dry Air
Exhaust
Span
Zero Air
VENT
MODEL 701
Zero Air Generator
Source of
SAMPLE Gas
VENT only if input is pressurized
Option 51 - Internal Zero/Span Option
(IZS)
MODEL
400E
Sample
Dry Air
Exhaust
Span
Zero Air
VENT
MODEL 701
Zero Air Generator
Source of
SAMPLE Gas
VENT only if input is pressurized
MODEL 700
Gas Dilution Calibrator
(w/ Photometer Option)
or
MODEL 401
Ozone Generator
VENT
Option 50 - Zero/Span Valve Option
Figure 7-4: Pneumatic connections for Manual Calibration Check with Z/S Valve
or IZS Options