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I disagree. It depends on how you calibrate the meter. If you are just letting it sit or waiving it in the air, then you want a slow flow rate. If I remember right, the faster the flow rate the greater the reading of the O2, i.e. it is reading richer than you actually have. Try different rates and see what happens. However, my recommendation is that you keep a bottle of EAN 21 that came directly from the compressor (so you know that is what it is) and calibrate off of that at whatever rate you want and then analyze at that rate. This also has the advantage of calibrating with no moisture/humidity since that is also what you are reading. When calibrating by letting the meter sit or from atmosphereic air, the humidity in the air is supposed to be taken into account. So with this procedure, that can be ignored. I personally use a slow flow rate.mempilot:What is the proper flow rate for analyzing O2 in lpm? I've been using 2 lpm, but someone told me that may be too low.
I'm using the analyzer at the LDS. It has 3 parts: the analyzer computer, the flow meter, and the tank valve fitting. I first calibrate it by attaching the tank valve fitting to a compressed air tank. I open the tank valve about half way and adjust the flow meter to read 2 lpm. After the digital readout on the computer stabalizes, I set the calibration wheel so the readout is 20.9. Then I shut off the tank valve, leaving the flow meter set at 2 lpm. I let the system bleed, and then connect my tank. I open my tank valve about half way and wait for the readout to stabalize. That is the reading I put on my tank.DepartureDiver:I disagree. It depends on how you calibrate the meter. If you are just letting it sit or waiving it in the air, then you want a slow flow rate. If I remember right, the faster the flow rate the greater the reading of the O2, i.e. it is reading richer than you actually have. Try different rates and see what happens. However, my recommendation is that you keep a bottle of EAN 21 that came directly from the compressor (so you know that is what it is) and calibrate off of that at whatever rate you want and then analyze at that rate. This also has the advantage of calibrating with no moisture/humidity since that is also what you are reading. When calibrating by letting the meter sit or from atmosphereic air, the humidity in the air is supposed to be taken into account. So with this procedure, that can be ignored. I personally use a slow flow rate.
mempilot:What is the proper flow rate for analyzing O2 in lpm? I've been using 2 lpm, but someone told me that may be too low.