Kaz911,
Ah, apologies, I did not realise that you had already looked at the service menu.
Your situation is unusual. It is not uncommon for early MK1 'bx' suffix cameras to only have range 1 calibration tables, but I had not heard of FLIR providing Range 2 calibration for a supplementary lens on such a camera. I suspect their automated calibration rig just generates the calibration files for Range 1 and 2, no matter which camera is attached to the supplementary lens at the time of testing.
It is possible to calibrate the camera for any Range using the service menu, but the correct high and low temperature Black Body thermal sources are needed.
As a side not on calibration..... Interestingly, whilst working on an early i5 recently, I found the production log for its calibration. It was clear that the camera had undergone an automated calibration routine that obeyed a set of 'on-board' camera 'descriptors' in order to produce only the required resolution and ranges. Thankfully I do not think the Exx series used such a calibration process and just the service menu is needed for calibration.
Fraser