Bacharach MGS-150, Installation And Operation Manual, Page: 29 / 36

MGS-150 Manual
6309-9000 Rev 2 29
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).
4
Locate Pot P3 which is used to calibrate the range (span) of
the sensor.
5 Monitor the output between 0V (negative) and VS (positive).
6
Expose the sensor to calibration gas and allow to stabilize
(approximately 3 minutes).
7
Adjust pot P3 to the voltage calculated in section 6.4 (page
29).
NOTE: For semiconductor sensors, you MUST use
calibration gas in a balance of air ( not N
2
).