Can I please ask your input on the implications of the following?
I am having issues to make the calibration of the JJ controller match the calibration of the HUD. The controller seems to be reading a bit higher than the HUD. In theory the HUD should be showing 1 orange at 1.0 (0.95-1.05) but when compared to the controller the controller seems to be reading between 1.04-1.10. This seems to be less of a noticeable problem at 0.7 as I do get 3 red dots or 1.3 as I do get 3 green ones. So the variance seems to be small and only noticeable around 1.0
I’ve tried several times and the outcome seems pretty consistent.
I think I know why this is happening and I think I know how to correct it but I am not sure of the implications of it thus, I would like to hear your input.
- a) Page 36 of the manual states that “the calibration gas must be set to 100% oxygen”
- b) However, the HUD assumes that “The actual value it uses for calibration is .98.” Shearwater HUD ***8211; Shearwater Research
- c) The predator manual states the following: “The system defaults to a calibration gas of 98% oxygen. This is to compensate for the difficulty in completely filling the loop with 100% oxygen and also to allow for water vapour.”
This would explain the difference in readings. In fact, if I modify the settings in the controller to calibrate to 0.98 both the HUD and the controller match a lot more closely.
So, should I be concerned or not?
For starters, I am not 100% clear if the 0.02% difference will make a significant difference and I’m making a storm on a tea cup