Universal User Guide, Rev L, February 2022
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4
TCM-1 Tilt Current Meter
This section is specific to the Model TCM-1 Tilt Current Meter and includes assembly, configuration, and
hanging in an inverted position.
4.1
Assembling the Current Meter (TCM-1 Only)
If you have the TCM-3, 4, or 5 those models have loggers built into the housing and do not require
additional assembly.
To assemble the TCM-1, screw the MAT-1 Data Logger into the end of the light grey pipe until tight. A
firm grip is sufficient. Do not overtighten or use tools.
Tip: Thread-locker is not normally required but may be desired if the meter will be subject to rough
handling or will be deployed in a challenging environment. If a thread-locker is used be sure to use a
plastic-safe thread-lock such as LocTite® 425 or equivalent.
4.2
Selecting a Velocity Range (TCM-1 Only)
The TCM-1 may be configured to increase its sensitivity for low currents by adding or removing the
ballast washer at the top of the meter. (See
Product Data Sheet
for the recommended speed ranges.)
The washer reduces the buoyancy of the meter and thereby increases the sensitivity of the instrument.
The washer is secured by a bronze bolt (1/2” wrench r
equired).
Tip: If you do not know the velocity in the deployment environment, leave the ballast washer off for the
widest velocity range.
Use a firm grip and screw the
logger all the way onto the
threaded bronze stud until tight.
Caution:
Use a 1/2” wrench but
do not
over-torque the ballast washer bolt. The
threads in the housing are made from
PVC plastic and can be stripped if the
bolt is over-torqued.
