RADIO TELEMETRY SYSTEM FOR
mV AND BRIDGE TYPE SENSORS
RT400 Series
Radio Telemetry System
for Sensors
Starts at
$
370
LC501, load cell, $340, shown smaller
than actual size, see page F-62 for details.
TRANSMIT —RECEIVE—DISPLAY
⻬ Up to 500 hr Battery Life
⻬ 13-Bit Resolution
⻬ Tough ABS Enclosures
⻬ Interference-Free
Transmission
⻬ Individual Coding Allows
Up to 256 Units
⻬ Sensor Excitation
Applications
⻬ Difficult-to-Wire
Installations
⻬ Remote Monitoring of
Strain Gages
⻬ Remote Stress Analysis
⻬ Weighing Systems
⻬ Remote Pressure
Monitoring
An Innovative Solution
In difficult installations, OMEGA’s
remote telemetry system for mV
sensors provides an innovative
alternative to costly cables or wires.
The RT400 system enables remote
data acquisition from sensors,
without hard-wiring.
The RT400 transmitter easily
interfaces with any resistor-based
or strain gage–based sensor and
converts the sampled analog signal
to digital code. This code is sent to
the receiver via FM radio
transmission. There, the original
analog signal is reconstructed and a
scaled output signal is produced.
The built-in UHF radio transmitter
and receiver circuits operate on
916 MHz and are type approved,
allowing license-free use. A fixed,
compact, 1⁄4 wave helical antenna
on both transmitter and receiver
units enables line-of-sight operating
ranges from up to 200 yards.
The compact design incorporates
miniature microprocessor-based
circuitry, which provides 16-bit
analog-to-digital conversion and
digital encoding for the radio
transmission. Owing to highly
reliable designs and data errordetection techniques, data
transmission is safe and free from
errors caused by interference.
The transmitter and receiver units
are powered by rechargeable
batteries. Battery life can be
extended up to 500 hours by
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using duty-cycle power saving
(a 1000 Ω load sampled every
10 seconds). Both the transmitter
and receiver units are lightweight
and housed in a rugged ABS case
that provides environmental
protection against water or dust
to IP65 standards.
An 8-way DIP switch sets the
transmitter and receiver address
codes. The 8-bit address code
prevents interference from adjacent
sets, and up to 256 codes are
available.
The RT400 transmitter will interface
directly with a Wheatstone bridge
sensor. An excitation voltage of
3.3 Vdc powers the sensor. The
excitation signal goes on 60 ms
before the sensor output is
sampled, then switches off to
extend battery life. Bridge
sensitivities from ±2 mV/V to
±400 mV/V are available for
maximum sampling sensitivity.
In reconstructing the signal from
the transmitter, the RT400 receiver
produces a scaled output of
0 to ±2.5 Vdc.
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C-43
42
(1.7)
40 (1.6)
55 (2.2)
90
(3.5)
21
(0.8)
RANGES OF UP TO 200 YARDS
DP25B-E, process meter, $245,
see page D-23 for details.
RT400R, receiver,
$425, shown
smaller than
actual size.
Connects to 4 mA display
Dimensions:
mm (in)
AVAILABLE FOR FAST DELIVERY!
To Order (Specify Model Number)
MODEL NO.PRICEDESCRIPTION
RT400T$370Transmitter module
RT400R425Receiver module with rechargeable battery
pack and analog output
RT400-CHARGER50Extra AC charger
Comes complete with AC adaptor, 3.6V rechargeable battery, and operator’s manual.
Ordering Example: RT400T, transmitter, and RT400R, receiver (complete system),
$370 + 425 = $795. An AC charging unit is standard with RT400R. Order a second charger
if simultaneous charging of both units is necessary in your application.
C-44
SPECIFICATIONS
RT400T TRANSMITTER
Frequency Range: 916 or 433 MHz
Transmitter Power: <10 mW
Transmission Interval: 500 ms to
10 s adjustable
Address ID: 0 to 255, switch selectable
User-Selectable Input Ranges:
Calibrators, Connectors, General Test and Measurement
Instruments, Glass Bulb Thermometers, Handheld Instruments
for Temperature Measurement, Ice Point References,
Indicating Labels, Crayons, Cements and Lacquers, Infrared
Temperature Measurement Instruments, Recorders Relative
Humidity Measurement Instruments, RTD Probes, Elements
and Assemblies, Temperature & Process Meters, Timers and
Counters, Temperature and Process Controllers and Power
Switching Devices, Thermistor Elements, Probes and
Assemblies,Thermocouples Thermowells and Head and Well
Assemblies, Transmitters, Wire
Flow and Level
Air Velocity Indicators, Doppler Flowmeters, Level
Measurement, Magnetic Flowmeters, Mass Flowmeters,
Pitot Tubes, Pumps, Rotameters, Turbine and Paddle Wheel
Flowmeters, Ultrasonic Flowmeters, Valves, Variable Area
Flowmeters, Vortex Shedding Flowmeters
pH and Conductivity
Conductivity Instrumentation, Dissolved Oxygen
Instrumentation, Environmental Instrumentation, pH
Electrodes and Instruments, Water and Soil Analysis
Instrumentation
Data Acquisition
Auto-Dialers and Alarm Monitoring Systems,
Communication Products and Converters, Data
Acquisition and Analysis Software, Data Loggers
Plug-in Cards, Signal Conditioners, USB, RS232, RS485
and Parallel Port Data Acquisition Systems, Wireless
Transmitters and Receivers
Band Heaters, Cartridge Heaters, Circulation Heaters,
Comfort Heaters, Controllers, Meters and Switching
Devices, Flexible Heaters, General Test and Measurement
Instruments, Heater Hook-up Wire, Heating Cable
Systems, Immersion Heaters, Process Air and Duct,
Heaters, Radiant Heaters, Strip Heaters, Tubular Heaters
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