How do I calibrate my VR3 with the external oxygen sensor and cable link connected to my closed circuit rebreather?
· Connect the sensor cable to the VR3’s I/O port. · Ensure the correct oxygen sensor cell is installed in the sensor holder, (see Oxygen Sensor Cell FAQs) · Install the sensor cell in your rebreather. · Switch on your VR3 · Select Dive Now (short push of both switches) to keep the VR3 active for 5 minutes · A long push on the right switch will take you into your Gas Select screen · Make sure you are in Closed Circuit Mode and you see CLOSED CCT at the top of your screen · If not go to Closed Circuit mode by a long push on both switches · A short push of both switches takes you into the ADJUST screen · Move the cursor to select NX 99 in your gas list and switch it ON NOTE: use NX 99 unless you are at altitude in which case see FAQ#6. · A long push of both switches will save NX 99 as your diluent · Save it as the calibration gas (CAL) by a further long push on both switches. · CAL GAS will appear on the screen · Then a short push on the right-hand switch will confirm and · a further shor
