Instrument Preparation; Calibration Photometer System Preparation; System Check; Model 49I Connected As Calibrator - Thermo Scientific 49i Instruction Manual

Instrument
Preparation
Calibration
Photometer System
Preparation

System Check

Thermo Fisher Scientific
Figure 4-1. Model 49i Connected as Calibrator
Use the following procedure to prepare the instrument prior to calibration.
1. Turn on the instrument and allow it to stabilize for a minimum of one
hour. Perform the service checks in the "Preventive Maintenance"
chapter.
2. Connect the Model 49i to the ozone manifold. If a Teflon® particulate
filter is being used, it must be installed prior to calibration.
As indicated in the EPA Technical Assistance Document there are several
tests that should be performed prior to the use of an ozone UV photometer
as a calibrator to ensure the accuracy of the measurements. These tests
include:
• System check
• Ozone loss test
• Linearity check
• Intercomparability test
A step-by-step checkout procedure to verify proper operation of a Model
49i Primary Standard (or a Model 49i modified as described earlier) is as
follows:
Calibration

Instrument Preparation

Model 49i Instruction Manual 4-3