4-20mA Loop-Powered Transmitters/Drivers
Applications
Riverhawk Transmitters convert the output from proximity probes, seismic sensors, accelerometers or velocity transducers into a 4-20mA DC current which is proportional to the input being measured.
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The transmitter converts the displacement or vibration signal to DC voltage and/or current for a DCS or PLC system. They control a 4-20mA current loop for a specified vibration range (ex. 0-5 mils peak-to-peak). The transmitters have a two-wire hook-up, powered solely by the loop current and have a power supply range of 15 to 36 volts.
Features:
- Loop-powered - only two wires to connect to a DCS or PLC system
- Auxiliary Signal Output
- Temperature Range -40°C to +85°C
- Loop Power Supply Range - 15 to 36 volts
- High Limit (max. current) - 25 ± 4ma
- Reverse Current Protection to 180mA
- Fault Detection (except for charge-coupled accelerometers)
4-20mA Loop-Powered Transmitters Connect to:
- Displacement Pickups (SMA)
- Proximity Probes (SMA)
- Accelerometers (Microdot)
- Velocity Transducers (SMA or terminal strip)
XT Series Transmitters
The XT-101 Vibration Transmitter converts the vibration signal as sensed by a proximity probe or seismic senor to a DC voltage which proportionally controls a 4-20 mA current loop for a specified vibration range such as 0-5 mils peak-to-peak, 0-125 microns peak-to-peak. Please take note that the loop current solely powers the transmitter. The XT-101 Model is most commonly used. XT-101X and XT-101Y Models are only used in applications where two probes are mounted in close proximity of each other. The XT-101X and the XT-101Y versions have different excitation frequencies to prevent interference
XT-101Vibration (input from Indikon Proximity Probe or A3J Seismic Pickup.) Controls loop current in proportion to vibration sensed by proximity pickup Specifications
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The XT-103 Displacement Transmitter connects to a proximity probe that is mounted perpendicular to a metal target. The transmitter generates DC voltage that is proportionate to the gap between the probe and the metal target. This DC voltage controls a 4-20 mA current loop for a specified probe gap range such as 35 - 75 mils, 20 – 200 mils, 0.50 – 2.00 mm. Please note that the loop current solely powers the transmitter. |
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Displacement (input from Proximity Probe) Controls loop current in proportion to proximity probe gap. Specifications
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The two-wire XT-121 Vibration Transmitter converts the vibration signal as sensed by an accelerometer to a DC voltage which proportionally controls a 4-20mA current loop. The 4-20mA range equals a vibration range in g’s (peak or average) of 0-1, 0-3, 0-5, etc. or in m/s² (peak or average) of 0-10, 0-20, 0-30, etc. The accelerometer signal first passes through a band-pass filter to establish the frequency range of interest. To monitor bearing vibration, ranges are most often expressed in velocity units (inches or mm per second, peak, or average) rather than acceleration units in g’s or m/s². Units with velocity outputs, XT-121V, have a signal intergrator that follows the band-pass filter. The vibration ranges become then 0-0.5ips, 0-1ips, 0-10mm/s, 0-15mm/s, etc. The transmitter is powered solely by the current loop | |||||||||||
XT-121Vibration (input from Accelerometers) Controls loop current in proportion to vibration sensed by accelerometer. Specifications
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590 Probe Driver SeriesRiverhawk also manufactures the 590 Probe Driver Series. The 590 converts displacement sensed by an eddy-current proximity probe, to a voltage output. The 590 is designed to work with a Probe Assembly. The driver is a 3-wire device with connections for power, common, and signal output. The driver is powered typically by negative 24VDC. The 590 is available in two versions; the 590X model is the standard unit and used in most cases. The 591Y model is used for the second probe when two probes are mounted in close proximity to each other, typically 90º apart on a shaft for vibration monitoring. The “X” and “Y” versions operate at different excitation frequencies, to avoid interfering with each other’s sensing operation. Typical Sensitivities: -200mv/mil, -100mv/mil, -50mv/mil, -20mv/mil Contact Engineering for Custom Applications. |
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