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
Up to 500 hr Battery Life13-Bit ResolutionTough ABS EnclosuresInterference-Free
Transmission
Up to 256 Units
Sensor Excitation
Applications Difficult-to-Wire
Installations
Remote Monitoring of
Strain Gages
Remote Stress AnalysisWeighing SystemsRemote 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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21
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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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