ARA SINGLE GAS DETECTION

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Hydrogen Sulfide (H2S)

Hydrogen Sulfide (H₂S) may desensitise and render the body unconscious in no time at high concentrations, therefore, reliable personal monitoring equipment is crucial.

Oxygen (O2)

This wearable oxygen detector has only one button to make use of the oxygen detector simple and alerts workers when oxygen health levels exceed set safety levels.

Carbon Monoxide (CO)

The ARA CO monitors offer live and personal carbon monoxide readings as well as lifetime remaining countdown to help users plan for future CO based projects.

Sulfur Dioxide (SO2)

The ARA SO2 gas detector allows users to set high/low alarms and offers instantaneous visual, audio, vibration alarms when SO2 is detected.

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Diffusion Vs. Pumped Fixed Gas Detection

Diffusion Fixed Gas Detection Device

A diffusion gas detection device works, as the name suggests, on the diffusion principle. The sensor is exposed to the ambient air and will measure the gas by means of the diffusion principle. Diffusion means proportional spread of molecules over the available space (from high concentration to low concentration). This also means that a diffusion gas detection device is only able to measure the concentration of gases at the location where the device is located. Since there is no forced flow of the gas to be measured, this device is not suitable for taking measurements remotely, but they do accurately identify what’s present in a given location.

Pumped Fixed Gas Detection Device

Pumped instruments are equipped with a built-in sampling pump. This means that the device is constantly drawing in gases. A sampling hose may be connected to extend the reach. This means that you can take a measurement from a safe distance so you have an idea of which gases will be present in which concentration before you are exposed to this environment. This allows you to make an appropriate risk analysis and make the right strategy and PPE choices based on the measurement results. By positioning the measuring hose correctly, you can also make a correct measurement at different heights to chart all risks.

OEM Sensors – comparison

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Comparative specifications
Sensor Variant	MiniPID 2 PPM WR VOC Sensor	MiniPID 2 PPM VOC Sensor	MiniPID 2 PPB WR VOC Sensor	MiniPID 2 PPB VOC Sensor	MiniPID 2 HS VOC Sensor	MiniPID 2 10.0 eV VOC Sensor	MiniPID 2 11.7 eV VOC Sensor
Electrode Stack Colour	Blue	Blue	White	White	Red	White + Gold Spot	White
Minimum Detection Limit	500 ppb	100 ppb	20 ppb	1 ppb	0.5 ppb	5 ppb	100 ppb
Range	0 to >10,000 ppm	0 to 4000 ppm	0 to >200 ppm	0 to >40 ppm	0 to >3 ppm	0 to >100 ppm	0 to >100 ppm
Response Time T90 (s)	<3	<3	<8	<8	<12	<8	<8
Sensitivity	>0.4 mV/ppm @ 100ppm	>0.65 mV/ppm @ 100 ppm	>5 mV/ppm	>30 mV/ppm	>600 mV/ppm	>15 mV/ppm	>1 mV/ppm
Lamp Energy	10.6 eV	10.6 eV	10.6 eV	10.6 eV	10.6 eV	10.0 eV	11.7 eV
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