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QuadGard Installation and Operating Manual. Issue 5. January 1996Page25

Dräger QuadGard - 20351 04–4 Set channel alarm 1 relay normally energised or energised on alarm

Channel alarm 1 relay can be configured to normally energised ('failsafe') or not; a'failsafe' relay will always be in alarm state if the power fails.1.Select channel command “04–4:A1 RLY ENERGISE” and press Reset2.The display will show “... ON ALARM” if the channel alarm 1 relay is energized onalarm or “... NORMALLY” if it is normally energized3.Press or to change the setting4.Press or to select a different channel5.Press Reset.

04–5 Set channel alarm 2 relay normally energised or energised on alarm

Channel alarm 2 relay can be configured to normally energised ('failsafe') or not; a'failsafe' relay will always be in alarm state if the power fails.1.Select channel command “04–5:A2 RLY ENERGISE” and press Reset2.The display will show “... ON ALARM” or “... NORMALLY”, for the selectedchannel alarm 2 relay3.Press or to change the setting4.Press or to select a different channel5.Press Reset.

04–6 Set channel relay 3 normally energised or energised on alarm

Channel relay 3 can be configured to normally energised ('failsafe') or not; a 'failsafe' relaywill always be in alarm state if the power fails.1.Select channel command “04–6:R3 RLY ENERGISE” and press Reset2.The display will show “... ON ALARM” or “... NORMALLY”, for the selectedchannel relay 33.Press or to change the setting4.Press or to select a different channel5.Press Reset.

04–9 Set analogue output range

The analogue output can give 4mA or 0mA for zero gas concentration; full-scale gasconcentration always gives 20mA.1.Select channel command “04–9:ANALOGUE O/P” and press Reset2.The display will show “4mA TO 20mA” or “0mA TO 20mA”3.Press or to change the setting4.Press or to select a different channel5.Press Reset.

10–0 Set zero for 4–20 channels

Calibrates the system to the zero gas concentration signal from the sensor head.1.Select channel command “10–0:SET ZERO” and press Reset2.The display will show the current gas measurement for the selected channel3.Press or to select the required channel4.Press or until the display shows a gas measurement of zero (assuming that nogas is present)5.Press Reset.Note:The zero point can only be adjusted by ±1mA. If you are unable to zero the display themeasuring head may need re-calibrating.