MGS-350 Manual
6509-9000 Rev 1
33
Example:
For a sensor range of 0-10,000 ppm and a cylinder of the
target gas at 800 ppm:
𝐕𝐨𝐥𝐭𝐚𝐠𝐞 = 𝐓𝐚𝐫𝐠𝐞𝐭 𝐆𝐚𝐬 𝐂𝐨𝐧𝐜𝐞𝐧𝐭𝐫𝐚𝐭𝐢𝐨𝐧 ×
𝟓 𝐕
𝐒𝐞𝐧𝐬𝐨𝐫 𝐑𝐚𝐧𝐠𝐞
𝐕𝐨𝐥𝐭𝐚𝐠𝐞 = 𝟖𝟎𝟎 𝐩𝐩𝐦 ×
𝟓 𝐕
𝟏𝟎𝟎𝟎𝟎 𝐩𝐩𝐦 = 𝟎. 𝟒 𝐕
So the output voltage signal should be adjusted to 0.4V.
Figure 12. Adjusting Alarm Relays on the Mother Board
IMPORTANT:
RV3 is used to adjust the relationship
between the 0-10 V scale and the 4-20mA scales. THIS IS
FACTORY SET AND SHOULD NOT BE ADJUSTED.
Tools required:
•
Gas cylinder with the appropriate gas and concentration
•
A voltmeter (crocodile clips recommended)