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Handheld Gas Monitor

Instrumentation & Measurement Solutions -
Handheld Gas Monitor

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Handheld gas monitors are sophisticated portable instruments for gas detection. They can detect the concentration of different flammable gases (CO, CH4), toxic gases (H2S, NO2, SO2), and other gases, and are widely used in a variety of industries such as petroleum, chemical, food, medical, semiconductor, automotive, mining and construction.

A handheld gas monitor is composed of sensors, signal conditioning circuit, ADCs, MCU, human-machine interface, and power supply. Sensors are one of the key components that determine the performance of handheld gas monitors. Depending on different categories and intended applications, one or more gas sensors of different kinds (such as flammable gas sensors and toxic gas sensors) can be found integrated within a single device.

Because gas concentration changes with temperature, a temperature sensor is necessary to detect gas or ambient temperature. The sensors used in handheld gas monitors commonly provide analog output, and therefore a signal conditioning circuit (of which amplifiers are the core components) is required to implement amplification and filtering of sensors’ small signals. The processed signals are then converted into digital signals by ADCs so that MCU can calculate gas concentration based on digital input and the pre-set algorithm. The human-machine interface on a handheld gas monitor includes several functional pushbuttons and a display for showing information. When the concentration of a gas is found higher than a preset limit, monitor will give sound and light alarm. The power supply consists of battery, power management and battery management. The power management is used to convert battery power into different voltages to satisfy different requirements. The battery management provides control and protection during battery charge process.

In order to ensure that handheld gas monitors have a small size and capability of working properly for a long life even in harsh environment, the components with high integration, low power, wide temperature range and small package, and a large-capacity rechargeable battery that can work in a wide range of temperature should be selected. Meanwhile, the approach that can reduce system’s power consumption should be adopted as many times as possible during system design

 

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APPLICATION NOTES

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TEXAS INSTRUMENTS MCUUsing power solutions to extend battery life in MSP430 applicationsMSP430Click Here
TEXAS INSTRUMENTS MCUDriving Large LCDs with LCD Peripheral of the MSP430MSP434Click Here
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MICROCHIPMCUSoftware Real-Time Clock and Calendar Using PIC16F1827AN1303PIC16F1827Click Here
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WHITE PAPERS

TEXAS INSTRUMENTS MCUDebunking the Ultra-low Power Comparison: MSP430 vs. Microchip XLP Tech Brief Click Here
FREESCALE SEMICONDUCTORMCUFreescale's Next Generation 8-bit LCD SolutionsClick Here
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FREESCALE SEMICONDUCTORMCUFreescale Low-Power Microcontroller Solutions BrochureClick Here
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TEXAS INSTRUMENTS MCUMSP430 Family Mixed-Signal Microcontroller Application Reports  Click Here
TEXAS INSTRUMENTS MCUMSP430(tm) Hardware Tools User's GuideClick Here
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TEXAS INSTRUMENTS MCUMSP430 Value Line LaunchPad Development KitClick Here
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EVAL KITS

FREESCALE SEMICONDUCTORMCUS08LL Demonstration Board DEMO9S08LL16DEMO9S08LL16MC9S08LL16Click Here
FREESCALE SEMICONDUCTORMCUTWR-S08LL64 Tower System 8-bit Segment LCD Module TWR-S08LL64-KITTWR-S08LL64-KITMC9S08LL64Click Here
FREESCALE SEMICONDUCTORMCUMCF51QE128 Evaluation BoardEVBQE128EVBQE128 MCF51QE128Click Here
FREESCALE SEMICONDUCTORMCUMCF51QE128 Demonstration Board DEMOQE128DEMOQE128MCF51QE128Click Here
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MICROCHIPMCUExplorer 16 Starter KitDV164033DV164033PIC24FClick Here
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MICROCHIPTemperature SensorMCP9700 Temperature-to-Voltage Converter PICtail? Demo Board MCP9700DM-PCTLMCP9700DM-PCTLMCP9700 Click Here
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OLIMEXMCUMSP430-449STK2MSP430-449STK2MSP430-449STK2MSP430-449STK2MSP430-449STK2MSP430-449STK2Click Here
OLIMEXMCUHEADER FOR MSP430F449 MSP430-H449MSP430-H449MSP430-449STK2MSP430-449STK2Click Here
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TRAINING
FREESCALE SEMICONDUCTORMCUFreescale DEMO9S08LL16DEMO9S08LL16 Out of the Box OverviewMC9S08LL16Click Here
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