Spectrex Series 300 Open-Path Gas Detection System - Manual (Page 58)

Spectrex Inc. - SafEye TM 300 Gas Detector Manual – TM 794100, Rev. D, May 2004
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7.2.1 Routine Optical Surface Cleaning
The SafEye system, being an optical device, must be kept as clean as possible.
The optical surfaces concerned are the Source and Detector viewing windows.
To clean the optical window, proceed as follows:
1. Turn off the power to the SafEye detector and source.
2. Where dust or dirt has accumulated on the optical surface, clean the
surface with a small, soft-bristle brush.
3. The surfaces must then be washed thoroughly with water and a mild non-
abrasive detergent.
4. Thoroughly rinse the glass surface with clean water; ensuring no residue
is left behind.
5. Dry the glass with a clean dry soft cloth.
6. Enter in the Maintenance Logbook: Date, name of person and company
who performed the maintenance service.
7. Turn on power to the SafEye detector and source.
8. Perform signal verification (section 7.2.2).
9. Perform zero calibration (see section 6.6).
10. Perform functional check (see section 6.7)
7.2.2 Signal Verification
The Signal Intensity Check determines if there is a misalignment or if the Light
Source signal is wearing over a period of time. Clean the optical surfaces prior to
performing this check (see 7.2.1). This procedure should be performed in clear
weather.
1. Enter Alignment Mode by placing the mode selector on the side of the
detector for 2 seconds.
2. Within the first 20 seconds the Detector indicates 3 different indication
levels. See Table 1
3. Wait 20 seconds and count the number of LED flashes with the color, and
adjust the value (see Table 18).
4. Record the new results in the maintenance log book.
5. Determine the absolute variance compared with the previous alignment
reading in the maintenance logbook.
6. If the variance is more than 30%, perform alignment (see section 6) and
zero calibration (see section 6.6). Call a technician for service if the SIC is
less than 66 with both LED’s flash in red color.
Table 18. LED Signal Adjustment
Color (left-right) Number to be
added
Red-Red 0
Orange-Orange 62
Green-Orange 124
Green-Green 186