Non-interference packaging:
The detector is encapsulated in an explosion-proof metal shell with a glass cover screwed on the shell. The magnetic programming buttons on the transmitter panel can be operated by hand-held magnetic programming tools, which ensures the interference-free operation of the sensor interface. All calibration and field debugging can be carried out without opening the cover and keeping the original state of the site.
Simple calibration:
Calibration tips are displayed on the LCD screen with backlight, which greatly simplifies the calibration steps. Technicians can simply start the calibration procedure with magnetic programming tools. Once the calibration procedure is started, the detector will display a calibration menu with two options: zero calibration and initial calibration. Selecting zero will start the auto-zero function. After calibration, the display will return to the calibration menu. Selecting SPAN will start automatic initial state calibration, and the display will ask the gas set by the detector and its concentration. Once the gas is supplied, the detector will automatically start calibration. When the signal is stable, the detector will record the initial data and prompt the operator to disconnect the air supply. Once the gas concentration reaches zero, the detector will automatically continue its original normal work. If the detector cannot perform the calibration procedure for any reason, the detector will display an error prompt. This process takes less than three minutes and there are almost no mistakes.
Signal output:
Infrared gas sensor has two kinds of signal outputs: analog 4~20mA output and RS-485 data bus output. There is only one output of 4~20mA. The output signal is a 4~20mA linear analog signal related to the detection range. The signal is compatible with Detcon's 10 series and 12 series multi-module controllers, programmable logic controllers and other standard data acquisition devices. Analog output has two other functions. First, when entering the calibration menu, the 4~20mA signal will be reduced to 2mA. This low current will be maintained until the sensor returns to normal operation. Second, once an error occurs, the signal from 4 to 20mA will drop to 0 mA, and this situation will remain until the error state returns to normal. The changes of these output signals can be used by external devices to identify and record the working state of the sensor.
RS-485 data communication adopts Modbus RTU protocol, which is compatible with almost all programmable logic controllers, human-computer interface software and other control systems. Because Modbus RTU protocol is a standard. The following information can be obtained from RS-485 communication interface: detector reading, detector alarm point, calibration mode, detector error, status of two alarms and calibration program error. The address of RS-485 can be changed by dual in-line package switch. The communication is two-wire and half-duplex, and 600 detector is used as its servo equipment. Theoretically, the main controller can control 256 different 600 detectors at a distance of 4000 feet.
Alarm characteristics:
The infrared gas detector has three relays, two for alarm and one for fault self-inspection. There is no relay. These three alarms can be adjusted to the following working states through jumpers: contact state (normally open or normally closed), and relays can also be adjusted to be continuously energized or continuously de-energized. In addition, the alarm clock can also be adjusted to mute. The alarm point can be adjusted through the menu. The self-check alarm can also be set to mute state through the menu, responding to the following situations: zero drift is lower than-10% range, microprocessor error, infrared light source error, signal parameter error or any other situation that hinders normal calibration. At 250 volts AC, the relay contact set current is 5 amps; 5 amps at 30 volts DC.
Programming state:
The programming state function allows users to set the alarm point, RS~485 identification number, detection gas and measurement range of the sensor in "View Programming State" on the menu by using magnetic programming tools. Once you enter the program, the display will automatically turn pages to complete all debugging steps. When finished, the sensor will return to normal working condition.
Over-range range:
When the gas concentration measured by the detector exceeds 100%LEL of the measuring range, the display screen will flash and display the highest value. When the gas concentration returns to the measurement range, the display screen will return to the normal working state.
Catalytic combustion gas detector;
It is used to monitor the change of combustible gas in ambient air from 0~ 100%LEL. The sensor adopts catalytic combustion technology, and the sensor can be replaced on site. The catalytic combustion sensor is sensitive to various combustible gases. This technology has universal applicability to combustible gases. The sensor has been specially designed with anti-poisoning function and can work reliably for five to ten years in most industrial environments.