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ASI Controls Building Automation Bard Wall-Mount and HVAC Equipment
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GD-1Specially Calibrated Combustible Gas Detector The GD-1 is an all electronic detector for special calibrations of most hydrocarbons, designed for use alone or for connection to alarm control panels. The GD-1 can operate on either 12 to 24 VDC power from standby or interruptible panel power, or be powered seperately. The attractive three part plastic case allows the GD-1 to be installed over a single gang, double gang or four inch square electrical box, providing a surface or near flush mount. Six inch long pigtail leads are provided for connections to the control panel or other devices.
Features: The GD-1 uses a full wave bridge rectifier at its power input, so that it is independent of the polarity of the input power. It can operate on DC or AC voltages between 12 and 24 volts. A switching regulator is used to efficiently match the wide input voltage range to the fixed, internal power system. As a result the power consumption is fairly constant at about 0.75 watts in normal operation, and 1.0 watts in alarm. The GD-1 has an internal 2 minute time delay, that prevents alarms during the warm-up of the gas sensor. During the warm up period the Green LED light blinks on and off. Once the delay is over, the continuous green light (ARMED) indicates normal operation. The GD-1 has a supervisory circuit of critical functions. A trouble condition, due to failure of a non-reliable component, results in both lights switching on and off and the normally closed trouble relay opening. A power failure also causes the trouble relay to open. The red LED (ALARM) turns on at the same time the SPDT alarm relay activates, to indicate the alarm condition. The relays are reed type devices that are glass encapsulated, thus are ignition protected.In the configuration, as shipped from the factory, the GD-1 is self restoring.When the air clears of gas, the red light turns off and the relay switches to its normal state. A jumper wire on the circuit board can be clipped to allow the unit to latch in upon alarm. Once latched in, power will need to be interrupted to un-latch the alarm condition.
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