CODEL Operation and Maintenance Manual
Issue : A Rev. : 3 Date : 13/11/2018 Ref. : 100351
P a g e | 2
The monitoring stations, Figure 1, provide all required measurements and outputs at each monitoring location
within the tunnel.
Figure 1: Tunnel Tech 500 Series - Monitoring Station
1.2 CO, NO, and NO
2
CO, NO and NO
2
are measured using electrochemical cell technology. Once the zero level of the cell is set and
recorded in the instrument memory, the cell output is linear and proportional to the ppm or ppb reading.
A serial data link via an RS485 interface allows communication directly with the TunnelTech 500 sensors.
The PSU is required to convert the mains (90-263V AC) supply to the 24V DC required to power the TunnelTech
500.
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