User guide

Spectrex Inc. - SafEye

300 Gas Detector Manual – TM 794100, Rev. D, May 2004

Notes:

1 The number of flashes shows the intensity of the received signals while the

color represents the gain (see Table 3). The left LED shows the “tens” unit of

the number while the right LED displays the “one” unit of the number of the

signal intensity. Each LED will flash 0 to 9 times (9 being the maximum

possible signal intensity). When the left LED has reached its highest signal,

look at the right LED for fine adjustment.

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 section 3.7.1

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 one of the

two following methods:

1. It can be measured proportionally (default) showing a continuous reading

of the exact gas concentration (see Table 4).

2. 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 SW3-2 selection (see Table 5).

The 4-20mA functions as current source. The maximum permitted load

resistance for the 4-20mA output is 600 ohms. The minimum permitted load

resistance is 100 ohms.