Warnings
Do not open the enclosure when the device is energized.
Do not open the enclosure if an explosive gas atmosphere may be present.
The Otis Instruments WireFree OI-6940 Notis Quad 4-Gas Sensor Assembly is Class I Division I, Groups
C&D Certified. The assembly is able to maintain its certification at all times while in the field, simply by using
the non-intrusive calibration method which requires the use of an Otis Instruments, Inc. distributed magnet.
However, if the enclosure lid is removed, for whatever reason, the OI-6940 Notis Quad certification is not
valid. To avoid invalidating the certification, once the device is put in the field, always use the Otis
Instruments, Inc. distributed magnet to ensure non-intrusive calibration.
Strong magnetic fields may interfere with the non-intrusive magnetic switches. A strong magnetic field may
momentarily active a switch, or permanently disable the switch to the “on” or “off” position.
Do not cover the hole in the calibration cup, as this will cause the calibration to be inaccurate.
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