Why can I not calibrate the external cell linked to my VR3 or why does it show a different reading to my rebreather cells?
It is likely that the rebreather has not been properly calibrated. To test this, follow the manufacturers’ recommended calibration procedure. For example:- · If you are at sea level set the atmospheric pressure at 1000mb; if not adjust for altitude · Fill the rebreather completely with oxygen with the loop closed · Then evacuate the loop, allowing no air in at any time · Repeat this three times · After the last fill make sure the loop is at ambient pressure by momentarily opening and closing the mouth piece or pulling the counter-lung dump cord · Read the rebreather displays · If they are at 1.0 Bar PO2, the rebreather is correctly calibrated · If not, repeat the calibration process NOTE: you may get a cell stuck message while calibrating with the counterlungs full of oxygen. If so, you may need to add a breath of air to the loop to allow auto calibration to take place.
