toxic gas alarm

The GD-70D toxic gas alarm is a gas detection unit that detects toxic gases, oxygen, and flammable gases that occur in semiconductor and LCD factories. GD-70D can achieve environmental load reduction through the reuse of sensor substrates and the reutilization of constituent materials. Compliant with specifications - CE mark, also supports RoHS directive.

Introduction:

The GD-70D toxic gas detector is a fixed gas detector used to detect gas leaks in semiconductor factories and other areas. Used to detect toxic gases in the atmosphere, with concentrations expressed in ppm (parts per million) and oxygen expressed in profit or loss (% VOL). The use of industrial grade high reliability electrochemical or infrared sensors gives them high stability and maintenance free characteristics, reflecting a high level of technological development. The toxic gas alarm has three preset alarm points that can be modified through the program, corresponding to three LED indicator lights. Two additional LED lights indicate faults and power on. The output of the detector is 4-20mA, and a contact relay outputs corresponding alarms/faults. It also includes an optional expansion card with 3 relay outputs.

This gas detector is a safety device. Use the built-in gas sensor to detect abnormalities in the air caused by gas or other reasons (leakage or lack of oxygen). The concentration of the measured gas is displayed on the digital LCD. The built-in pump of the detector will extract and lift for gas measurement, with gas alarm contacts and fault alarm contacts, outputting gas concentration in 4-20mA or digital form, and can measure various toxic gases such as hydrogen sulfide, silane, ozone, nitric oxide, etc.

Function Description:

The core of a toxic gas detector is a 10 bit microprocessor (i.e. microcontroller) with the following built-in functions:

1. Self diagnostic function: Control the correct operation of hardware and sensors.

2. Zero point automatic tracking: It can automatically correct the drift of the zero point caused by temperature and physical changes in the detector, thereby maintaining the zero point unchanged.

3. Digital filtering: used for digital analysis of analog sampling values.

4. Hysteresis cycle: used for alarm output. When the concentration of hazardous gases approaches the limit value, it can prevent the detector from continuously outputting switch signals.