ComSonics CyberTek QUALIFIER, User Manual

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Appendix - Qualifier System
3-6
Appendix D: Pressure Relief
The Qualifier meter case is sealed against
water. Because of this seal, taking the Qualifier
meter to extremes of air pressure (e.g., from
sea level to a very high elevation) may cause
air pockets within the keypad. To alleviate this,
the Qualifier meter is fitted with a pressure
relief “valve”: a Phillips screw directly beneath
the label on the back of the unit.
Loosen the screw a few turns and wait five
minutes for the air pressure within the unit to
equalize.
Do not forget to re-tighten the screw
after performing this action!
!