Step 3. Installed the Regulator to the Gas cylinder
Step 4. Attach the tube to the regulator
- Power ON the device;
- Place the device in a clean-air environment (the target value is nearly zero) at a temperature from 20 - 30 oC, in at
least 60 minutes. It is better to use the 99.99% Nitrogen gas as zero gas instead of clean air.
- After 60 minutes, record the Voltage output value. Recording multiple values in 5 minutes to calculate the average
value.
- 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, record the voltage output, then record voltage output value again at the minute of 3, 4, and 5.
Calculate the average output value of the minutes of 3, 4, and 5.
- 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.
Please use the Flow Regulator with a flow rate of 2.5 LPM or 5.0 LPM.
Step 1: Get the Zero value.
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: 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.