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2150EX Area Velocity Flow Module
Section 2 Preparation and Installation
2-10
If you are installing the LTC2191EX lithium battery packs, first
disconnect the 2150EX module(s). If you are installing the
SLA2191EX lead-acid battery packs, it is not necessary to dis-
connect the 2150EX module(s). Then:
1. Remove the battery door. To remove the door, turn it
1
/4 turn
counter-clockwise and pull it from the Battery Module.
2. Align the connectors and insert the new battery pack into
the Battery Module.
3. Check the humidity indicator disk inside the door. (See sec-
tion 2.4.3.)
4. Replace the door. Align the small triangle on the door with
the triangle above the battery port, push inward, and
rotate
1
/4 turn clockwise so the curved arrow is at the top of
the door.
Repeat steps 1 through 4 to install the second battery pack.
When finished, reconnect the 2150EX module(s).
Note
The battery packs should always be replaced as a pair. Never
mix old and new batteries. Battery packs should be disposed
of according to local battery disposal regulations. The
lead-acid battery packs should be recharged or recycled.
2.4.3 Inspect the Desiccant –
Battery Module
A humidity indicator is mounted inside each battery cap on the
Battery Module. The humidity indicators have regions that
display 20, 30, and 40 percent humidity levels. Ideally each
region should be completely blue. As the desiccant becomes satu-
rated, the humidity levels will increase and the regions turn
pink. When the 40 percent region turns pink, the Battery Module
is no longer adequately protected and the desiccant must be
replaced. Refer to section 5.4 for replacement instructions.
2.4.4 Inspect the Desiccant –
2150EX Module
A desiccant cartridge is inserted into the side of the 2150EX
Module. The cartridge is filled with silica gel beads that will
indicate when they are saturated. When dry, the beads are blue
or yellow. As the desiccant becomes saturated, the humidity
levels will increase and the beads turn pink or green. If the
entire length of the desiccant cartridge turns pink or green, the
reference air is no longer adequately protected and the desiccant
must be replaced. Refer to section 5.4 for replacement instruc-
tions.
CAUTION
Operating the 2150EX and sensor with saturated desiccant
can cause many problems such as drifting level readings and
permanent damage. It is important that the equipment is ser-
viced often enough to prevent the entire desiccant cartridge
from becoming saturated.
20
30
40
Humididy indicator