ONSET FlexSmart TRMS Module S-FS-TRMSA Instruction Manual
- June 6, 2024
- Onset
Table of Contents
FlexSmart TRMS Module S-FS-TRMSA
Instruction Manual
Models: S-FS-TRMSA
S-FS-TRMSA-D
Included Items:
- Detachable screw terminal connector
- Imprintable label
The S-FS-TRMSA and S-FS-TRMSA-D are easy-to-configure, True-RMS input
measurement modules. The S-FS-TRMSA is compatible with HOBO® H22 series data
loggers. The S-FS-TRMSA-D is compatible with HOBO H22 loggers, U30 stations,
and RX3000 stations. The “-D” variant has a modular connector for connecting
to an available smart-sensor port. Both 2-channel modules have an input range
of 512 millivolts RMS full-scale. Thus, they are fully compatible with
industry-standard voltage and current transformers (PT and CT) which output
333 millivolts RMS full-scale.
The modules feature extremely low-power operation, resulting in long battery
life for unattended data logging applications.
Note: Refer to the H22 logger, U30 or RX3000 station, and HOBOware®
software manuals at
www.onsetcomp.com/support/manuals
for additional information on using and configuring the FlexSmart TRMS module.
Specifications
| Input Channels | Two; AC-coupled |
|---|---|
| Field Wiring | Iwo-wire via screw terminals on detachable connector, 16-24 AWG |
Replacement detachable connectors: Part of spares kit (A-FS-TRMSA4P-1)
Input Range| 5 to 512 Vrms
Minimum Input Voltage| SmVRMS; Input voltages < 5mV will be clipped to zero
(see graph below)
Maximum Input Voltage| ±1V referred to AC- terminals (pins 2 and 4)
Input Frequency| 50/60 Hz
Accuracy| ±0.3% of reading +/- 0.5% of FSR
ADC Resolution| 15 bits
AC Waveform| <4 Crest Factor
Power Requirements| +3.3V @ 3mA active, 61.tA sleep
Transfer Function|
Measurement Averaging Option| Yes
| The CE Marking identifies this product as complying with all relevant
directives in the European Union (EU).
Module Connections
Potential Transformers (PT) and Current Transducers (CT) are connected to the
module via a four-pin Phoenix-style detachable screw terminal connector. Once
the PTs and/or CTs are connected, the module can then be configured using
HOBOware software with the module installed on the HOBO H22 or U30 series
logger or using OBOlink® with the RX3000 station. Note: There are
limitations to the number of modules and smart sensors you can use with an
RX3000 station. If you are using both TRMSA-D modules and smart sensors, then
you are limited to a maximum of two TRMSA-D modules and any combination of
smart sensors to reach a total of 13 data channels. For example, if there are
two TRMSA-D modules in use with the RX3000 station, then this will leave nine
additional data channels for smart sensors. Refer to the smart sensor manuals
at
www.onsetcomp.com/support/manuals
for the number of data channels used by a specific smart sensor. If you are
not using smart sensors with the RX3000 station, then you are limited to a
maximum of four TRMSA-D modules. Exceeding these guidelines may result in
erroneous readings.
The diagram below illustrates typical connections between a PT and CT. For
module connection instructions specific to PTs and CTs purchased from Onset,
refer to the documentation provided with each PT and CT.
Note: For three-phase monitoring, each of the three modules should be
wired so that similar parameters are connected to corresponding pin numbers.
For example, voltage inputs pin 1 and 2 on each module; current inputs pins 3
and 4 on each module.
Measurement Averaging
This module supports measurement averaging. When measurement averaging is enabled, data is sampled more frequently than it is logged. The multiple samples are then averaged together and the average value is stored as the data for the interval. For example, if the logging interval is set at 10 minutes and the sampling interval is set at 1 minute, each recorded data point will be the average of 10 measurements. Measurement averaging is useful for reducing noise in the data.
1-508-759-9500 (U.S. and International)
1-800-LOGGERS (564-4377) (the U.S. only)
www.onsetcomp.com/support/contact
© 2008–2020 Onset Computer Corporation. All rights reserved. Onset, HOBO,
FlexSmart, HOBOware, and HOBOlink are trademarks or registered trademarks of
Onset Computer Corporation. All other trademarks are the property of their
respective companies.
10093-I MAN-S-FS-TRMSA
References
- Technical Support | Onset's HOBO and InTemp Data Loggers
- HOBO Resources | Onset's HOBO and InTemp Data Loggers