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Current Loops
See Also: Loop, HIL, Loop Testers
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AC Current Sensor
RCTi and RCTi 3ph
The RCTi & RCTrms sensors convert ac current to an isolated 0-5V voltage or 4-20mA current loop. TA5V-5A allows compatibility with existing 1A or 5A CT metering circuits. Both offer a choice of proportional (rms) and instantaneous outputs. The available RCT current ranges are 0-100A to 0-50,000Apk. Both RCTi and RCTrms provide accurate measurement over a wide bandwidth ensuring precise measurement even with harmonically distorted wave shapes - using a flexible clip-on sensing coil. The RCTs are available as single and three phase models.
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4-port Serial Interface, Modular, With/without Optical Isolation, 3.3V/5V, With 9-pin Connectors
APCI-7500-3/4C
*This model has 4x 9-pin D-Sub male connectors on 2 brackets*RS232, RS422, RS485, 20 mA Current Loop*Modular structure through SI modules*With or without optical isolation*Mode configuration free for each port*128-byte FIFO-buffer, common interrupt*Transfer rate programmable up to 115,200 Baud*Option: up to 1 MBaud for RS485 and RS422*Automatic direction recognition for RS48*Mode: configurable RS232, RS422, RS485, 20 mA Current Loop (active, passive) with or without isolation (SI modules)
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Mezzanine System
5658
ECM P/N 5658 provides eight channels of 16 bit current measurement in the 0 to 25 milli-amp range. Each channel allows independent common mode voltages from -100 volts to +100 volts. Current detection is accomplished with a precision 100 ohm current sense resistor, creating a voltage drop of 2V in the current loop at 20 milli-amps.
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Opto-Isolated Current Loop Signal
4029
SPECTEC Innovative Sensor Solutions
SPECTEC's Model 4029 digital opto-isolated current loop signal conditioner prevents ground loops and interrupts any galvanic signals riding on magnetic speed sensor's output signal.. This signal conditioner converts magnetic, variable reluctance and inductive sensors' sinusoidal signals into a 4-20 mA output suitable for interfacing with process control units, dataloggers, flow controllers, and computers.
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Current Loop 20 MA Constant Current SI-module With Optical Isolation
MXTTY
Current loop 20 mA constant current (active, passive) SI-module with optical isolation.
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Calibrator Process
VA70034
Shanghai Yi Hua V&A Instrument Co., Ltd. CO.,LTD
Loop calibrator This Calibrator is use to measure or output 0 to 24 mA DC current loop, and 0 to 20 V DC voltage.
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Microwave Moisture Meter
RX-95
The system works based on the absorption of microwave energy by water molecules contained inthe x-rayed material. It is a non-contact, non-destructive method of instant measurement of water content - used for materials such as coal, flour, grain, cement, seeds, sugar, etc. Thanks to high measurement sensitivity (resolution greater than 0.01% of water content by weight), short measurement time (about 5 times/sec.) and repeatability of measurement - the system is suitable for continuous measurement of material moisture, e.g. on conveyor belts and its recording on a PC or using a 4-20 mA current loop.
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Measurement & Simulation
Highland Technology offers a wide array of tools for measurement, simulation, and control. Tachometers, thermocouples, RTDs, precision voltages, current loops, strain gauges, and more can be measured or simulated by Highland's products.
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Industrial 4-20mA Driver
Analog Devices portfolio of leading industrial d/a converters and drivers addresses the challenges of enhancing system accuracy, reliability, and overall functionality while reducing form factor and power dissipation. The products provide a range of programmable output ranges from standard 4–20 mA for current loop communication to ±10 V for actuator control. They simplify industrial system design by offering considerable control functionality and advanced on-chip diagnostics to maximize system up time. ADI industrial converters also eliminate the need for costly calibration routines needed by some traditional discrete architectures.
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Loop Meters
The CM-1TB + XL-1 are modern digital current loop-powered meters that convert standard loop current to engineering units. They feature high accuracy and a large 0.6-inch LCD display. Proven reliability combined with low cost has earned these meters world-wide acceptance, with thousands in use.
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- RS-232 to Current Loop Converter
Model 65A
FEATURES: Active/Passive Loops; 20 or 60 mA. Operation; DC To 19.2 KBPS; Half/Full Duplex; Optically Isolated; DTE/DCE Selectable. The Model 65A is a small, versatile, RS-232 to Current Loop Converters for use with teletypes or computers providing local terminal input via a 20mA. (or 60 ma.) current loop. The Model 65 includes a wall mounted transformer and internal power supply circuitry.
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PCI Express 16 Reed Relay Output
8004e
The 8004e PCI Express digital I/O interface provides 16 optically isolated inputs and 16 Reed relay outputs. The isolated inputs protect the PC and other sensitive equipment from the voltage spikes and ground loop currents that are common to industrial environments. The outputs provide high quality, long-life, dry contact switch closures suitable for low-current applications.
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Industrial 4-20mA DAC Solution
Analog Devices portfolio of leading industrial digital-to-analog converters address the challenges of enhancing system accuracy, reliability, and overall functionality while reducing form factor and power dissipation. The products provide a range of programmable output ranges from standard 4–20 mA for current loop communication to ±10 V for actuator control. They simplify industrial system design by offering considerable control functionality and advanced on-chip diagnostics to maximize system up time. ADI industrial converters also eliminate the need for costly calibration routines needed by some traditional discrete architectures.
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Resistance Tester With Leakage Current (Loop Current)
GT00WD00ZY
*screen display*Double protection insulation*Non-contact measured resistance, safe, fast
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PCI Express 8 Reed Relay Output
8012eS
The 8012eS PCI Express digital interface provides eight optically isolated inputs and eight Reed relay outputs (SPST). The isolated inputs are non-polarized and rated for 3-30 VDC. Optical isolation protects the PC and other sensitive equipment from the voltage spikes and ground loop currents that are common to industrial environments.
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Digital LOOP/PSC/LOAD Tester
2811 LP
Standard Electric Works Co., Ltd
● Microprocessor-controlled.● Displays and sound warning if external voltage present.● Displays mains voltage, scroll trough menus.● Checks wiring integrity (LEDs and display).● Single button operation.● Auto-off/auto-ranging.● Combined prospective short circuit current, PSC and LOOP tester.● Built-in carry case, test leads in separate pouch.● Loop test for L-E and L-N and PSC.● Voltage test L-N and L-E.● Enables analysis of constituent components in L-E and L-N loops giving resistance of earth, neutral wire, live wire and transformer winding.● Display can be customized for special orders.● 60Hz available on request.
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Fuse Buddy Current Loop
307M/308B
*Just clamp your current probe over the loop to access the amperage draw through a fused circuit. *Easy testing access, plugs right into fuse socket, no more hand made adapters. *Testing range 0-30 Amps - Do Not Exceed 30 Amps
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PXI Analog Output / Current Loop Simulators
These modules are aimed at simulating industrial control transceivers, utilizing 4–20mA current loops. The modules include built-in relays for shorts and opens functionality enabling fault insertion testing on every channel and also enable slew rates to be programmed so that different sensors can be effectively mimicked.
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PAT and Installation Verification Unit
PowerCheck 1557
The PowerCheck 1557 is a comprehensive PAT and installation verification checkbox. It carries out ongoing performance checks to ensure accurate measurement between calibration intervals. Fully tests Earth Continuity, Insulation Resistance, RCD Trip Time, RCD Trip Current, Loop, PE Conductor Current, Touch Current and Flash tests.
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Digital LOOP/PSC/LOAD Tester
1825 LP
Standard Electric Works Co., Ltd
● Microprocessor-controlled.● Measures the voltage drop as if 16A was flowing between Line and Neutral.● Displays voltage without current (V at 0A).● Display voltage as if 16A flowing between Line and Neutral (V at 16A).● Loop test for L-E● PSC between L-N.● Single one smart push button operation; ON, Scroll through results and menus.● Checks wiring integrity (LEDs).● Auto off/auto ranging (software range).● Combined prospective short circuit current, loop and load tester.● Display can be customized for large orders.
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Analog & Digital I/O Modules
USB analog and digital I/O modules are a complete family of data acquisition modules for use in process control systems. The analog input modules can measure process signals such as DC voltage, thermocouples, 4-20mA current loops, discrete contact closures.
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Current Loop Expansion Kit
OP-SB85C
This expansion kit supports current loop communications.The kit incorporates a communications circuit with photo-coupler isolation and constant-current power supply of insulated type, thus realizing not only monitoring but also easy communications testing with passive or active current loop devices.
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Intelligent Transmitter with Digital Indication
LEO 3
KELLER AG für Druckmesstechnik
LEO 3 is a micro-processor based transmitter with digital double-display for pressure (top display) and for the output signal (bottom display). The display is powered from the 4...20 mA current loop. Functions:
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Loop Meter
MZC-310S
The MZC-310S is a professional portable meter for testing electrical installations with over-current circuit breakers. The instrument measures short-circuit L-PE, L-N and L-L loop and prospective short-circuit loop current. A measurements can be done either with low testing current (up to 42A) with 2-pole method or high testing current (up to 280A) with 4-pole method that enables measurements with very high accuracy and resolution.
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Loop-Powered Digital Panel Meter
88-PRO
The 88-PRO Process Meter may be connected directly to a 4-20 mA, 10-50 mA or 1-5 mA current loop, with no need for additional power to the meter. This is because the meter is powered directly by the current loop, developing a maximum voltage drop of 2.5 V.
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16-Channel DAC Function Card
ProDAQ 3510
The ProDAQ 3510 DAC function card is a ProDAQ high-density card that fits into ProDAQ VXIbus motherboards and LXI function card carriers. This high-density card contains 16 independent, 16-bit DAC channels, and each channel is equipped with its own DAC. The ProDAQ 3510 DAC function card is specially designed for DC, low-frequency, and current loop applications.
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Signal Isolators & Converters
Devar current loop signal isolators reduce problems found in field measurements when signal transmitters or converters encounter both input and output signals that may be grounded. Current loop isolators eliminate these ground loops and are available as input loop powered or output loop powered instrumentation.
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Multifunction Installation Testers
Shanghai Beha Electronics Co., Ltd.
Loop impedance and prospective short circuit current measurement• Line impedance and prospective short circuit current measurement• Earth loop resistance in TT-systems• Rotary field test• RCD measurements (contact voltage, trip time, trip current - ramp method)• RCD analysis for test of all RCD parameters • Low Ohm and continuity measurement • Insulation measurement up to 1000V (suitable for 690 V industrial mains systems)• Earth resistance measurement with probes and clamp adapters• Voltage and frequency measurement • Current measurement with clamp adapters(optional)• Power and energy measurements• Harmonics measurement for voltage and current upto the 21st harmonics
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4 (High Current) D/A Outputs (±40 VDC or +100 mA)
DA3
The DA3 module features 4 high-current D/A output channels with a full-scale range of ±40 VDC or ±100 mA (max). The DA3 provides either voltage or current control loop modes that are programmable for the particular application.
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PCI Express 8 Reed Relay Output
8012e
The 8012e Low Profile PCI Express digital interface provides eight optically isolated inputs and eight Reed relay outputs (SPST). The isolated inputs are non-polarized and rated for 3-30 VDC. Optical isolation protects the PC and other sensitive equipment from the voltage spikes and ground loop currents that are common to industrial environments.
