Spectrex SafEye 300 Series, Руководство пользователя

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Output Signals
24 SafEye TM Open Path Detection System User Guide
Table 3: Alignment Indication LED Color
Left LED Right LED Gain
Red Red 3
Orange Orange 2
Green Orange 1
Green Green 0
2 After 20 minutes at alignment mode the detector will return to normal mode.
3 After zero calibration is finished, the detector will return to normal mode and
the signal intensity will be saved for next alignment comparison.
4
The 4 – 20mA level in this table refers to discrete indication option. A different
(continuous reading) option is described later in 4 – 20mA Current Output on
page 24.
3.7 Output Signals
The SafEye system provides the following outputs:
• Standard 4 – 20mA port
• Three dry contact relays
• Optional RS-485 output for PC communications
3.7.1 4
–20mA Current Output
The 4 – 20mA output can provide the detector status measurement in 1 of
the 2 following methods:
• It can be measured proportionally (default) showing a continuous
reading of the exact gas concentration (see Table 4).
• It can be a discrete indication according to the detector mode or the
warning or alarm signal at a defined gas concentration. Setting of this
method can be done by a maintenance host or PC unit.
The 4 – 20mA functions as the current source. The maximum permitted
load resistance for the 4 – 20mA output is 600ohms. The minimum
permitted load resistance is 100ohms.