Calibration Equipment; Figure 70 - Portable Purge Calibrator; Figure 71 - 3-Liter Chamber - General Monitors 4802A Instruction Manual

Model 4802A

6.2.6 Calibration Equipment

The Model 4802A uses a Portable Purge Calibrator (Figure 70) or the 3 Liter Chamber
(Figure 71), to accomplish calibration. The calibration and calibration check procedures
and use of the Portable Purge Calibrator is explained in Sections 5.2 and 5.3.
Figure 70 – Portable Purge Calibrator
The procedure using the 3-Liter Chamber (Figure 71) is explained below:
The 3-Liter Chamber is used when the 4802A is calibrated with liquid or solvent vapors.
Before the Model 4802A is calibrated with any solvent or volatile liquid, consult the
listing in Appendix B to determine the volume of solvent/liquid required to produce a
50% LEL concentration in the 3-Liter Chamber. However, if the user specified calibration
level is not 50% LEL, consult the factory for the correct volume. Let the factory know the
calibration level (25 to 90% LEL) and the solvent/liquid being used to calibrate the
sensor.
Figure 71 – 3-Liter Chamber
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