Technical Manual CODEL
22
Maintenance
The Tunnel Tech 700 Series system is designed for low maintenance. The sensors utilise the latest
microprocessor technology. The AQM sensor uses an infrared source that has a life expectancy of
over 3 years.
Routine Maintenance
VIS
6.1.1.1. Mechanical Check
Every 6 months - clean the optical surfaces of the AQM sensor and the reflector unit.
Access to the lenses is obtained by removing the sight tube on the front of the sensor mounting
bracket; this is done by removing the retaining bolts securing the tube to the flange. Removal of the
tube reveals the two lenses. Clean the lenses with a soft dry cloth and replace the sight tube. There
should be no need to re-align the sensor.
Access to the reflector is gained by removing the sight tube on the front of the reflector mounting
bracket. This is done by removing the retaining bolts securing the tube to the flange to reveal the
mirror on the inside of the cover plate. Clean the mirror with a soft dry cloth and replace the sight
tube. There should be no need to re-align the reflector.
The next stage of the mechanical check is to check detector levels. By following the steps below,
observe the detector levels to see if they correspond with the required levels of 10000 +/- 2000.
6.1.1.2. Press to return to the main display.
From the main display press to reach Diagnostics. Press to access
Diagnostic data.
.
6.1.1.3. Use the key to reach Vis Diag, and press to access.
6.1.1.4. Use the to reach Vis DRx, and press to access.
6.1.1.5. Vis DRx: Observe DRx Smoothed value while adjusting the optical alignment of the
instrument until this value has reached a plateau.
1. Meas - 09:24:29
CO: 21 ppm
3. DIAGNOSTICS
3.5. VIS Diag
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