User's Manual

Introduction
6
There are two options available:
1. OM4720/5G
• Measures 5 gases, provides live readings of all gases and λ
• PC software to graph and/or diagnose emissions faults from gas readings
2. OM4720/4G
• Measures 4 gases, provides live readings of all gases and λ
• PC software to graph gas readings
The OmiScan Gas system enables the measurement of four or five of the main
exhaust gases emitted from a spark ignition engine. The gases measured are:
Carbon Dioxide (CO
2
), Carbon Monoxide (CO), Hydrocarbons (HC), Oxygen (O
2
) and
Nitric Oxide (NOx) (optional). Measurement accuracy meets or exceeds requirements
for OIML Class 0 and BAR97:
• CO:Range - 0% to 15%; accuracy typically 3% relative
• CO
2
: Range - 0% to 20%; accuracy typically 3% relative
• O
2
: Range 0% to 25%; accuracy typically 1% relative
• HC n-hexane: 0 to 2000ppm; accuracy typically 3%
• HC n-propane: 0 to 30000ppm; accuracy typically 5%
• NOx :Range - 0 to 5000ppm, accuracy typically 3% relative (optional)
The optional PC based system provides enhanced facilities for data capture and
graphing as an additional feature.
The OmiScan Gas handset communicates with the base station using Bluetooth
®
Wireless Technology and with the PC option, the handset communicates with a PC
via a USB port.