Spectrex Quasar 900 Open-Path Gas Detection System Manual de usuario descargar pdf (Pagina 27)

TM 888200 Rev (I), January 2014

Visual Indicators 15

3.2 Visual Indicators

One 3-color LED indicator is located in the back side of the detector/source

and can be seen through the back cover window. See Figure 2 and

Figure 3, item 11.

The detector statuses are listed in Table 3.

Table 3: Detector LED Indications

Detector Status

LED Color

LED Mode

Fault

Yellow

4Hz – flashing

Alignment / Standby

Yellow

1Hz – flashing

Zero Calibration

Yellow

Constant

Normal

Green

1Hz – flashing

Warning

Red

2Hz – flashing

Alarm

Red

Steady

The source statuses are listed in Table 4.

Table 4: Source LED Indications

Source Status

LED Color

LED Mode

Fault

Yellow

4Hz – flashing

Normal

Green

1Hz – flashing

3.3 Output Signals

The SafEye system provides the following outputs:

 0-20mA Current Output, page 15

 RS-485 Interface, page 16

3.3.1 0-20mA Current Output

The 0-20mA output provides the detector status measurement showing a

continuous reading of exact gas concentration.

The 0-20mA functions as current sink, but it can be configured as Source

(see Appendix A).

The maximum permitted load resistance for the 0-20mA output is 600Ω.

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