Onset HOBO U23-002 Operating and safety instructions

HOBO® U23-002 Replacement Cable/Sensor (CABLE-U23-002)
12990-B MAN-CABLE-U23-002
The U23-002 Replacement Cable/Sensor replaces a damaged cable on the U23-002. The replacement cable includes a built-in
temperature sensor and an RH sensor.
Contents:
•Cable/Sensor
•Dome Nut/Grommet assembly (installed on cable)
•Cable Tie
Required Equipment:
•Adjustable Wrench
•Utility Knife
Removing the Existing Cable/Sensor
1. Unscrew the grommet from the case and slide the
grommet/dome nut assembly down the cable. Use a wrench
if necessary.
2. Remove the end cap from the case. Twist the end cap
counterclockwise until the bumps on the cap line up with the
notch on the case, and then pull the cap off of the case.
3. Slide the board out of the case.
4. Remove the 3 desiccant packs and inspect them. If they are
not bright blue, dry them by leaving them in a warm (≤70oC
(158oF), dry location until the bright blue color is restored. If
a desiccant pack remains pink and will not turn blue, replace
it with a new desiccant pack (Part #: DESICCANT1).
5. Using a utility knife, cut the tie holding the sensor to the
board.
6. Disconnect the cable from the jack on the board (pull straight
out).
7. Pull the cable out through the case.
8. Discard cable, dome nut, and grommet.
Connecting the New Cable/Sensor
1. Slide the new cable through the case, connector end first.
2. Slide the dome nut/grommet assembly up towards the case
and hand-tighten the grommet. Do not tighten the dome nut
until assembly is complete to allow for sliding of the cable.

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12990-B MAN-CABLE-U23-002
3. Plug the mini-USB connector from the cable into the jack on
the bottom of the board.
4. Secure the cable to the board using the cable tie (included).
Feed the tie through the two holes near the end of the
board, with the cable tie’s ‘buckle’ on the battery side of the
board. Ensure that cable tie is tight and then trim the end.
5. Slide the board into the case. Align the sides of the board
with the grooves on the side of the case. Push the board into
the case until the outermost edges of the board are flush
with the beginning of the rails. Gently pull the cable where it
exits the grommet as you insert the board.
IMPORTANT: You can press on the end of the board to help
guide it into the case, but do not press on the LED and
photodiode leads or they may be damaged.
6. Re-insert the 3 desiccant packs.
7. Re-install end cap. Make sure the O-ring on the end cap is
still in place. It should not be pinched, twisted, or trapping
dirt or lint, which could interfere with the end cap. Line up
the two small bumps on the end cap with the two notches at
the end of the case and then push end cap in and lock into
place by turning clockwise just slightly until bumps prevent
further rotation.
8. Tighten dome nut.