Omega Products RT400R User Manual
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. PRICE DESCRIPTION
RT400T $370 Transmitter module
RT400R 425 Receiver module with rechargeable battery
pack and analog output
RT400-CHARGER 50 Extra 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:
±2 mV/V ±5 mV
±10 mV/V ±25 mV
±200 mV/V ±500 mV
±400 mV/V ±1000 mV
Resolution: >0.02% (13-bit)
Sensor Excitation: 3.3 Vdc
Power Requirement: Internal 3.6 Vdc
@ 120 mAh rechargeable battery
Standby Current: 150 µA
Battery Life: 500 hr typical when
fully charged
Housing: High-impact ABS
Dimensions: 55 x 90 x 40 mm
(2.2 x 3.5 x 1.6")
Weight: 120 g (4.2 oz)
Operating Temperature: -10 to 55°C
(26 to 131°F)
Storage Temperature: -40 to 85°C
(-40 to 185°F)
Antenna: 42 mm
Sensor Connection: 4 screw terminals
for 0.5 to 1.5 mm (24 to 15 AWG) wire
Cable Gland: Accepts cable diameter
3.0 to 6.5 mm (0.16 to 0.25")
RT400R RECEIVER
Frequency Range: 916 or 433 MHz
Receiver Sensitivity: -133 dBm
Communication Failure Alarm:
Adjustable time delay, open drain
output (100 mA max current);
LED indication
Analog Output: 0 to ±2.5 Vdc
Resolution: >0.02% (13-bit)
Power Requirement: 12 Vdc from
battery pack
Internal Battery: 3.6 Vdc @ 120 mAh
rechargeable battery (included)
Battery Life: 8 hr typical when
fully charged
Battery Charger: 12 Vdc @ 20 mA for
7 hr or continuous float charge
Housing: High-impact ABS
Dimensions: 55 x 90 x 40 mm
(2.2 x 3.5 x 1.6")
Weight: 120 g (4.2 oz)
Operating Temperature: -10 to 55°C
(26 to 131°F)
Storage Temperature: -40 to 85°C
(-40 to 185°F)
Antenna: 42 mm
1
⁄4 wave helical
1
⁄4 wave helical
ACCESSORIES
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