On-Device Calibration
The F-900 can be calibrated without any additional software. To access the calibration options, navigate to Setup > Calibration. Choose which sensor you want to calibrate. Choosing the sensor go to PPB and then select the Re-calibration function. Follow the steps listed below. You will need the following to start a calibration:
- A standard gas (Refer to Table 1 on pg. 2)
- Fresh potassium permanganate in solids chamber (aka Chamber Out or Chamber B)
Before connecting your standard gas the prompt will ask you if you want to use the Chamber Out as your zero source.
- If you have selected Yes, then procced to the next step.
- If you have selected No, then it will ask you to connect the zero gas you want to use.
- Then it will ask you to write in the exact concentration of the gas you will be using.
- After all that is done the offset will begin to run, and the results will show typically around 15-20min.
Below are some instructions on how to connect your standard gas to calibrate the gas sensors on your F-900:
If using an On Demand Flow Regulator, directly connect the regulator to the IN port on the F-900. When using an On Demand-Flow Regulator, the gas is drawn out of the regulator/cylinder by the pump of the F-900. When the regulator is fully twisted onto the cylinder, the PSI on the gauge will move. Rotate the regulator until it is tightly onto the cylinder of gas (clockwise).
- The regulator can be removed from the cylinder (a small puff of gas will escape) to be used with other gas cylinders or for storage. To remove the regulator, twist counter-clockwise.
Figure 17: Ethylene calibration gas cylinder with On Demand Flow Regulator connected to F-900 IN port.
If not using an On Demand Flow Regulator, be sure to use a t-valve release extra pressure to avoid damaging the F-900. Alternatively, a flow meter can be connected to be sure that the flow going into the F-900 is appropriate levels and gas is not being wasted. Always open the regulator very slowly and allow only 1-2 PSI (6-13 kPa) until the ethylene value starts to increase on the F-900.
After connecting your standard gas and the offset calibration has been complete.
- It will ask to connect your desired calibration (span) gas. After that it will ask you again to write in the exact concentration of the gas.
- Once the exact value of your span gas has been written, the calibration will start, usually takes about 5-10 min.
- After 10 min the calibration will be complete and your new offset and gain will be shown on screen.