- User Manual For Vt310 Combustible Gas Alarm Controller 2
- User Manual For Vt310 Combustible Gas Alarm Controller Free
- List Of Combustible Gases
- Flammable Gas
- User Manual For Vt310 Combustible Gas Alarm Controller Download
The Macurco GD-12 is a line voltage, dual relay Combustible Gas detector, controller and transducer. The GD-12 utilizes an internal switching power supply that is capable of using line voltage between 100 and 240VAC and 50-60Hz. The GD-12 has selectable 4-20 mA output, buzzer and digital display options. Combustible Gas Detectors; Carbon Dioxide Infrared Gas Detectors; Photoionization Gas Detectors; Dual Sensor Gas Detectors; 4-20mA Sensor Transmitters; Flame Detectors; Alarm Controllers. Sensepoint Gas Detector; Specialty Single and Dual Channel Controllers; Single Channel Viewsmart 2150S LED Alarm Controller; 2-Channel ViewSmart 2150/2050 LED.
8
95-8472
3.1
SENSOR VOLTAGE ADJUSTMENT
The combustible gas sensor is designed to operate at
3.3 Vdc. Voltages greater than this will shorten sensor
life, while voltages less than this will reduce sensor
sensitivity. The sensor supply voltage potentiometer
is adjusted at the factory to deliver 3.3 volts when the
sensor is coupled directly to the transmitter housing.
However, if the sensor and Model 505 Transmitter
are located separately, and the distance exceeds
the recommended distance indicated in Table 1, re-
adjustment is necessary. To adjust sensor voltage,
connect a digital voltmeter across the white and black
sensor wires (at the sensor).
Adjust the sensor voltage potentiometer (see Figure 8)
to obtain a reading of 3.3 Vdc on the meter. For sensor
separation configurations, this is typically a two-person
procedure.
Always measure the sensor voltage whenever utilizing
a sensor separation kit, and any time a Model 505
transmitter has been replaced. Failure to deliver 3.3 Vdc
to the sensor will result in loss of system accuracy.
CAUTION
The voltmeter must be suitable for use in a
hazardous location.
NOTES
1. SHIELDED SENSOR WIRING CABLE REQUIRED.
2. GROUND SENSOR WIRE SHIELD AT TRANSMITTER END ONLY.
3. SHIELDS SHOULD BE STRIPPED BACK WITHIN JUNCTION BOXES.
4. TERMINAL CONNECTOR REQUIRED FOR SENSOR CONNECTION
4.
(PROVIDED WITH SENSOR TERMINATION BOX).
SENSOR LOCATION
TRANSMITTER
LOCATION
CONNECT KEYED SENSOR
PLUG TO PIN CONNECTOR
CONTROLLER
4 TO 20 MA
24 VDC
–
–
+
+
C1939
–
SIG
RED
SENSOR
WHT
BLK
+
RED
WHT
BLK
Figure 7—Model 505 Transmitter with Sensor Termination Box
Table 1—Maximum Sensor Separation Distances
Wire Size
(AWG)
Recommended
Maximum Transmitter to Sensor Distance*
Maximum Transmitter to Sensor Distance**
User Manual For Vt310 Combustible Gas Alarm Controller 2
Feet
Meters
Feet
Meters
20
User Manual For Vt310 Combustible Gas Alarm Controller Free
12
3.6
65
19
18
20
6.1
100
31
16
31
9.4
160
50
14
50
List Of Combustible Gases
15.2
260
79
12
78
24.0
410
126
Flammable Gas
* Transmitter voltage adjustment not required.
** Transmitter voltage adjustment is required.
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