FlexSmart™ TRMS Module (S-FS-TRMSA & S-FS-TRMSA-D) Manual
10093-H MAN-S-FS-TRMSA
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
Two-wire via screw terminals on detachable connector, 16-24 AWG
Replacement detachable connectors: Part of spares kit (A-FS-TRMSA-
4P-1)
Input Range
5 to 512 mVRMS
Minimum Input Voltage
5mVRMS; 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 r/- 0.5% of FSR
ADC Resolution
15 bits
AC Waveform
<4 Crest Factor
Power Requirements
+3.3V @ 3mA active, 6
μ
A sleep
Transfer Function
( )
[ ]
•
=
T
dt
t
V
T
VRMS
0
2
1
Measurement Averaging Option
Yes
The CE Marking identifies this product as complying with all relevant
directives in the European Union (EU).
Minimum Input Voltage Graph
FlexSmart TRMS Module
Models: S-FS-TRMSA
S-FS-TRMSA-D
Included Items:
•
Detachable screw terminal
connector
•
Imprintable label
