horiba APNA-370, Operation Manual, Page: 13 / 113

1 OVERVIEW
1
1 OVERVIEW
1.1 Introduction
APNA-370 is an ambient nitrogen oxide monitor using the chemiluminescence (CLD) method
as its operating principle. This monitor allows you to continuously measure the concentrations
of nitrogen oxides (NO, NO
2
, and NOx (NO + NO
2
)) in the atmosphere.
The concentrations of NO
2
are calculated from those of NO and NOx.
As the analog output of concentrations, you can select either the combination of momentary
value and rolling average or that of momentary value and average (optional). The default
setting is the combination of momentary value and rolling average.
Addition of an RS-232C port (optional) will allow you to carry out data communication.
1.2 System Configuration
APNA-370 is a standalone system that allows you to operate it by merely connecting a
calibration gas diluter.
The system can be upgraded by connecting a computer, monitor, recorder, calibration gas
generator.
The system configuration of APNA-370 is shown in the following diagram:
Fig. 1 System configuration
APNA-370
Calibration gas
High-concentration
calibration gas
(Optional)
dilution unit