- Use the standard gas cylinder with a known concentration (for example NH3 in N2 with a concentration of 25ppm or
50ppm) to supply the gas to the sensor;
- Use the calibration cap as above pictures to attach to the sensor and connect the tubing to the gas cylinder;
- Open the valve on the Cylinder slowly and make sure the gas has reached the sensor. Please use the Flow regulator
2.5 LPM or 5.0 LPM.
- Press a timer to start counting the time;
- After 2 minutes, force the device to send data once every minute, and stop forcing at 5 minutes. The highest
Raw_value is the Span value.
- After that, immediately turn OFF the valve to save the gas;
- Remove the calibration cap from the sensor;
- Place the sensor in clean air again.
-The calculation of new A, B value based on basic linear formula: y = A * x + B
Where:
A, B is calibration coefficients
x is the sensor process value (example gas level in ppm) read on reading device (RAW_VALUE in the payload) such as
on application server/network server, on offline tool
y is the correct value. y is the value of standard gas/standard condition
Which condition of Zero value: y
0
=A * x
0
+ B
Which condition of Span value: y
s
=A * x
s
+ B
From the two formulas, the calculation of A, B as below
A = (y
0
- y
s
) / (x
0
- x
s
)
Note: the Raw_value can be positive or negative; it will be in the range of -3.00 to +3.00 ppm
Step 2: Get the Span value
Note: Keep the sensor Power ON all the time;
Notes:
- The tube length is short as possible to reduce the gas loss.
Note: Just get one value for Span
Note: Always keep the sensor Power ON all the time;
DO NOT PLACE THE SENSOR IN THE SPAN GAS FOR MORE THAN 5 MINUTES; IT WILL SATURATE THE
SENSOR OUTPUT AND DEGRADE THE SENSOR LIFE QUICKLY.
Step 3: Calculate the new A and B
Summary of Contents for Lidar People Counter
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Page 9: ...Daviteq Gas Detection Technologies...
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Page 64: ...Figure 12 Adjust the orientation of the probe 5 7 Attach the Wireless Transmitter to the probe...
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Page 87: ...Tel 84 28 6268 2523 4 ext 122 Email info daviteq com www daviteq com...
