Hi everyone,
Recently i have made a Gas Detector circuit which detects the leakage of
methane Gas at 10% LEL (see figure 1) & it works fine.
The sensor i m using is TGS2611.
The sesnsor has a variable resistance Rs which decreases the resistance with the concentration of GAS & when VRL exceeds VREF the alarm signal generates.
please note that the value or RL is matched with the sessor ID #18
at 10% LEL (RL=3.65KOhm)
Now i m trying to built the same circuit using two conditions
1. At 10% LEL it generates an alarm sinnal.
2. At 20% LEL the system should shut down.
(see Figure 2)
The Value for RL at 20 % LEL should be 2.61KOhm.
Please see the attachments, the figure 2 represents two level gas detector.
Kindly suggest me the resistance value that best suits the application in Figure 2.
THANKS.
Recently i have made a Gas Detector circuit which detects the leakage of
methane Gas at 10% LEL (see figure 1) & it works fine.
The sensor i m using is TGS2611.
The sesnsor has a variable resistance Rs which decreases the resistance with the concentration of GAS & when VRL exceeds VREF the alarm signal generates.
please note that the value or RL is matched with the sessor ID #18
at 10% LEL (RL=3.65KOhm)
Now i m trying to built the same circuit using two conditions
1. At 10% LEL it generates an alarm sinnal.
2. At 20% LEL the system should shut down.
(see Figure 2)
The Value for RL at 20 % LEL should be 2.61KOhm.
Please see the attachments, the figure 2 represents two level gas detector.
Kindly suggest me the resistance value that best suits the application in Figure 2.
THANKS.
Attachments
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