HOBO MicroRX Station Manual
1-800-LOGGERS 22
www.onsetcomp.com
•
The sensor face located in the nose cone of the sensor
end needs to be in the water to measure water level.
•
Any change in length of the sensor cable will result in a 1-
to-1 corresponding error in the depth measurement.
Always pull-test a cable prior to deploying a logger in a
well to make sure it does not stretch.
•
If you are deploying the sensor in a lake, river, or stream,
you must first build a stilling well to protect it and the
cable. A simple stilling well can be constructed with PVC
or ABS pipe. A properly constructed stilling well holds the
sensor in position and protects the sensor from currents,
wave action, and debris. Suspend the sensor in the
stilling well so it is always underwater, but not on the
bottom to be buried by silt.
For more information, see the Technical Application Note
for Constructing a Stilling Well at:
http://www.onsetcomp.com/water_level_stilling_well.html
•
To prevent the sensor from moving in currents and to
ensure the support cable is kept straight during
deployment, you may need to add a weight to the
suspension cable just above the sensor or hang a weight
below the sensor. In some cases, you may need to both
add a weight and use a stilling well.
•
Be very careful not to exceed the burst pressure for the
sensor. The pressure sensor will burst if the maximum
depth is exceeded (see
Specifications
). The sensor should
be positioned at a depth where it will remain in the
water for the duration of the deployment, but not
exceed the rated bursting depth.
•
If the cable is too long, loop the cable and secure the
cable with multiple zip ties to ensure the loop does not
slip. The looped cable should be tight enough that the
cable can be easily pulled out of the well if necessary, but
it must not bend the cable any tighter than a 1.25 cm (0.5
inch) radius to prevent damage to the cable.
Installing the Grounding Wire
If you are using a grounding wire (CABLE-MICRO-G), attach it to
the grounding wire port on the back of the station. Use the
screw and washer included with the grounding wire to attach it
to the port.
•
If you are mounting the station on a tripod or mast, use
the optional U-bolts (U-BOLT-KIT2). Attach the grounding
wire under one of the nuts on one end of the U-bolt.
•
If you are mounting the station on a metal post, clamp the
grounding wire to the metal post with a hose clamp or a
U-bolt.
•
If you are mounting the station to a flat surface, attach the
grounding wire to a proper ground. Note that the
grounding wire may prevent the logger from being flat
against the surface. Be careful not to bend the case when
tightening screws.
Care and Maintenance
The station is designed for outdoor use, but should be
inspected periodically. When inspecting the station, do the
following:
•
Verify the station enclosure is free of visible damage or
cracks.
•
Make sure the station is clean. Wipe any dust or grime off
with a damp cloth.
•
For RX2102 and RX2104 models: Make sure the built-in
solar panel is clean. Wipe off any debris with a damp cloth.
•
Wipe any water off the station before opening it.
•
Check that all cables and wires are free of damage, such as
cracks, cuts, and splits.
•
Make sure cables and wires are still fastened securely and
any conduit is still intact.
•
Grease the sides and bottom of the cable channel and the
portion of the cables in the cable channel with a small
amount of silicon grease.
•
Verify that all cables and wires are free of corrosion. If
moisture is visible inside the station, open the door to air
it out. Be sure to determine the source of the moisture
and fix it. Check the cable channel and cover seals for any
sign of moisture entry.
•
Make sure the cable channel is intact and installed
properly, and the latches are fully locked when the station
door is closed.
Connect the
grounding
wire here
Make sure the
sensor face
(represented by
dashed lines in
this diagram) is in
the water to
measure water
level
10.0 mm (0.39 in.)
