User Guide Head BIS L-300-S116 Edition 0408 not flush mounting General installation notes for BIS L All read/write distances presume ambient temperature +20°C If BIS | components ore mounted in or on steel , or there is metal within the active field of the read/write head , the field data will be reduced and communication may be compromised. When installing date carriers on or in steel , note the reduced rewrite distances. Precise distance date available on request.