Spectrex Series 300 Open-Path Gas Detection System - Manual (Page 55)

Spectrex Inc. - SafEye TM 300 Gas Detector Manual – TM 794100, Rev. D, May 2004
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6.4 Powering on the system
Important!
Prior to any operation or maintenance follow the Safety Precautions given at
section 6.5
1. Make sure that the source and detector are connected to the power.
2. Make sure that the 4-20mA meter is connected to the detector.
3. Power up the system 18-32VDC.
4. After 60 seconds, the left LED lights at green, the current meter will
indicate 4mA.
Note
If it is the first operation after installation, the LED may indicate any status. Zero
calibration should be performed after powering the system (see section 6.5).
6.5 Safety Precautions
After powering-up, the detector requires minimal attention in order to function
properly, but the following should be noted:
1. Follow the instructions in the manual and refer to the drawings and
specifications issued by the manufacturer.
2. Do not open the detector housing, while power is supplied.
3. Do not touch internal parts other than the two functional switches.
Interference with internal circuits may impair detector performance and will
invalidate manufacturers warranty.
4. Disconnect external devices, such as automatic extinguishing systems
before carrying out any maintenance task.
6.6 Zero Calibration
Precise alignment must be performed prior to the calibration procedure.
Calibration should be performed in nice weather conditions with insignificant gas
concentrations in the surrounding environment or indoors.
Note
To change modes, place the Magnetic Mode Selector (see Figure 15, item 1) on
the detector for 2 seconds and wait for the LED indication.
After mode change allow a time lapse of 5 seconds before changing mode again.
Standby mode is a temporary mode lasting about 20 seconds used to facilitate
Zero Calibration mode selection. If the mode selector is not placed during this 20
seconds period, the detector will be switched to Normal mode.
1. Switch from Normal to Alignment mode. See Table 2 for LED status
indication.