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MGS Installation and Operation Manual

28 1000-0085 Rev 0

• Gas cylinder with the appropriate gas and concentration

• A voltmeter (crocodile clips recommended)

• Screwdriver (depending on housing).

The MGS has three sensor PCB versions: semiconductor (SC),

electrochemical (EC), and infrared (IR).

6.4. Calculating Calibration Voltage

Sensor outputs are linear. As long as you have a gas cylinder of known

concentration you can calibrate to any desired range.

Example: For a sensor range of 0-1000 ppm and a cylinder of the target gas

at 800 ppm:

𝐕𝐨𝐥𝐭𝐚𝐠𝐞 = 𝐓𝐚𝐫𝐠𝐞𝐭 𝐆𝐚𝐬 𝐕𝐚𝐥𝐮𝐞 ×

𝟓 𝐕

𝐒𝐞𝐧𝐬𝐨𝐫 𝐑𝐚𝐧𝐠𝐞

𝐕𝐨𝐥𝐭𝐚𝐠𝐞 = 𝟖𝟎𝟎 𝐩𝐩𝐦 ×

𝟓 𝐕

𝟏𝟎𝟎𝟎 𝐩𝐩𝐦

= 𝟒 𝐕

So the output voltage signal should be adjusted to 4V.

6.5. Calibrating Semiconductor (SC) Sensors

Step Calibrating Semiconductor (SC) Sensors

1 Locate Pot P2 which is used to adjust the zero point.

2 Monitor the output between 0V (negative) and VS (positive).

3 Adjust Pot P2 to 0 V or slightly positive (0.01 V is acceptable).

Locate Pot P3 which is used to calibrate the range (span) of the

sensor.

5 Monitor the output between 0V (negative) and VS (positive).

Expose the sensor to calibration gas and allow to stabilise

(approximately 6 minutes).

7 Adjust pot P3 to the voltage calculated in section 6.4 (page 28).

NOTE: For semiconductor sensors, you MUST use calibration

gas in a balance of air (not N

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Murco MGS Spezifikationen Seite 28