Meriam M2 – Series Smart Manometer - Manual (Page 34)

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To install the four batteries: 1) Make sure polarity of
battery matches the markings in the compartment. 2) 1st
place the (+) end of the battery into the battery slot. 3)
Then push in the (-) end of the battery until seated in the
bottom of the battery slot. The battery compartment has
stand offs molded into the side of the compartment. When
a battery is installed with the polarity reversed, the stand
offs prevent the negative battery terminal from contacting
the positive terminal in the battery compartment. The unit
will not power up when a battery is installed this way.
Should this happen, simply reverse the battery to align the
polarity.
With the batteries secured in the battery compartment,
replace the compartment cover. The cover has only one
correct alignment. The “WARNING
DO NOT OPEN IN
EXPLOSIVE ATMOSPHERE
” statement on the battery cover
must be visible and aligned in the middle of the
manometer case.
To secure the cover, torque the screws clockwise to 1.6-
1.8 in-lbs. Do not over tighten.
To prevent internal damage to circuitry, do
not substitute screw lengths for the factory
supplied screws.