3M GD-6 Benutzerhandbuch

10

11

GD-6

Main Fan Power

120VAC 

ALARM

120VAC 

Power

Exhaust Fans

coil

coil

power

output

GD-6

–

+

power

output

–

+

4

3

2

1

1

1

3

3

4

5

6

7

8

9

2

24 V 

RET

N.C.

N.C.

N.C.

N.O.

N.O.

N.O.

COM

COM

COM

-1 LOOP

+1 LOOP

+24 VDC

-1 LOOP

+1 LOOP

+24 VDC

- Strobe 

+ Strobe 

- Horn 

+ Horn 

Relay 1

Gnd

Panel Power 

120/250VAC

3M™ MACURCO™ 

 DETECTION AND VENTILATION 

CONTROL PANEL DVP-120

STARTER RELAYS 

120VAC COILS

Relay 2

Relay 3

24 V 

RET

L

N

Gas detection and exhaust fan control is provided by a 3M™ Macurco™ DVP-120 system. This System 
will use the GD-6 Combustible Gas  to current transducer, Nitrogen Dioxide to current transducers or 
Carbon Monoxide to current transducers. Each transducer will measure the level of the target gas and 
provide this information to the DVP-120 over a 4-to-20mA current loop.
All power and signal connections for the transducers are provided from the DVP-120 control panel, via 
unshielded four conductor cable. The DVP-120 control panel provides three relays which can be used for 
ventilation fan control or alarm signaling. These relays (SPDT-Form C) are for pilot duty only, capable of 
switching 10 amps loads up to 240VAC.
NOTE:
1. Power connections at the sensor are non-polarized.

 

W

W

Each time the unit is turned on it performs a self-test, which activates visual alarms. If the self-test fails, or if all the alarms 

do not activate, do not use. Failure to do so may adversely affect product performance and 

The 3M™ Macurco™ GD-6 Combustible Gas Detector cycles through an internal self-test cycle for the first minute that it is 

powered. The unit will execute the test cycle any time power is dropped and reapplied (i.e. power failure). During the self-test 

cycle the unit will display the firmware version number, then count down from 60 to 0 and finally go into normal operation. The 

fan and alarm relay will be activated for the power-up cycle unless the “Power Up Test” (PUt) option is OFF. The indicator light 

(LED) will flash green during the self-test cycle. At the end of the 1 minute cycle, the unit will take its first sample of the air and 

the light will turn solid green. 

Do not cover or obstruct visual alarm LED. Doing so may adversely affect product performance and 

or death.

1.  With the display function turned “On”, the 3M™ Macurco™ GD-6 Combustible Gas Detector will show the current 

concentration of gas % LEL or “0” (zero) in clean air. When the gas concentration reaches the Fan Relay setting (10% LEL, 

for example) the display will flash back and forth between “FAn” and “10”. With the display function turned ”Off”, the 

display does not show the gas concentration, but will show “FAn” as long as the fan relay is activated.

2.  With the display function turned “On” and the gas concentration reaching the alarm relay setting, (20% LEL, for example) 

the display will flash back and forth between “ALr” and “20”. The buzzer will sound indicating “Alarm” if the buzzer is 

turned “On”. With the display function turned off the display does not show the gas concentration, but will show “ALr” 

when the Alarm relay is activated.

3.  With the 4-20mA function turned “On”, the 4-20mA output will correspond to the concentration (0-50% LEL). The display 

will show “FAn” and “ALr” and sound as outlined above.

•  The default

Display setting is off

•  The default

power Up Test setting is on

•  The default

Buzzer setting is off

•  The default

alarm relay setting is activation at 20% LEL

•  The default

Fan relay Delay setting is 3 minutes

•  The default

Fan Minimum runtime setting is oFF

•  The default

Fan relay setting is activation at 10% LEL

•  The default

alarm relay Configuration is normally open

•  The default

4-20ma output setting is oFF