Chapter 4: Modules
18 HOBO Energy Logger Pro User’s Guide
Connecting sensors to the module
Insert the Phoenix-style screw terminal connector into the connector on the end of the module.
Tip: The TRMS module is a single-ended device. Pins 2 and 4 are connected to signal ground and to each other.
Refer to the sensor documentation for terminal connection details and use the pinout diagram below to connect a
two-wire sensor or transducer to the module’s terminals. To make the connection, loosen the screw for each pin on
the connector, insert the appropriate wire, and tighten the screw.
The following example illustrates typical connections for two transformers:
Tip: Always refer to your sensor documentation for terminal connection details.
Once the sensors are connected, install the TRMS module into any of the three module slots on the logger. For more
information, refer to “Assembling the logger” on p. 4.
Use the provided label to identify a module/sensor combination to aid in determining sensor placement and cable
routing when in the field.
Configuring channels
Each channel of the TRMS module is individually configurable to accept a wide range of sensors. That means that
each channel can be configured to measure either current or voltage, and the collected data can be scaled to produce
meaningful results that are consistent with the properties being measured.
Use HOBOware Pro to configure each channel at launch time, or create and save different configurations to be
loaded into the modules whenever needed. A channel configuration consists of a channel name, measured property
name, and scaling parameters. Refer to the HOBOware Pro User’s Guide for details.
Verifying operation
The TRMS module begins functioning when logging begins. When the module is functioning correctly, the
Active
indicator on the module blinks once per logging interval for each configured channel to indicate that a successful
measurement has been made.
Tip: If you will be logging on both of the TRMS module’s channels, you must use a logging interval of two
seconds or greater. If you will be logging on only one channel per TRMS module, a one-second logging
interval can be used.
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