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Current Loops
See Also: Loop, HIL, Loop Testers
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AC Power Sources, Frequency Converter
MAC-01, -02, -03
For reliability, all models of the Titan AC Power Sources/Frequency Converters are fully current limit protected against either continuous or transient short circuit or overload conditions. When an overcurrent condition exists, the internal current control loop overrides the voltage control loop and scales back the sinewave drive until it sees a safe output current level.
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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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- 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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4-20mA Current Loop D/A Converters
ADI integrated solutions combine both the D/A converter and driver in one chip to provide the required output directly from the digital domain. Analog Devices’ portfolio of leading industrial D/A converters and drivers provides a range of programmable output ranges from standard 4 mA to 20 mA for current loop communication to ±10 V for actuator control. ADI industrial converters offer considerable control functionality and advanced on-chip diagnostics to maximize system uptime, as well as eliminate the need for costly calibration routines needed by some traditional discrete architectures.
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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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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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PC Based High Current Test Set for Circuit Breakers and Temperature Rise Test Equipment
This equipment comprises of high current source for testing of circuit breakers with additional facility for temperature rise testing (thus incorporating testing for moulded case, vacuum & air circuit breakers as per IEC 60947-2). The system integrates a servo controlled source with closed loop current feedback to maintain the current constant. It has the necessary instrumentation for maintaining current at full load & other conditions arising in testing at high current. The bench has a PC based control system with temperature data logger (24 channel with ch-ch isolation amplifiers). The data logger displays as well as stores a set of temperature values with time.
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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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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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Dual High Speed Power Supply
VX4620
Dual high speed power supplyLow noise linear output stage with 200 Vpp and 1 AProgrammable bipolar voltage and positive/negative current limitsStable control loop even on long load linesAuto sensing featureProgrammable slew rateProgrammable over GPIB, USB or RS232Fast rise and fall times due to integrated sink capability
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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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PXI/PXIe Analog Output/Current Loop Simulator Module - 8 Channel
43-765-003
The 41/43-765-003 is an 8-channel Analog Output Module designed to meet the requirements of industrial control applications utilising current loops 4 – 20mA. It consists of up to four 16-bit, digital-to-analogue converters (DAC), capable of creating four current outputs each. Output current within 0mA - 4mA and 20mA - 24mA, give the ability to simulate error or extra signalling conditions. The ±24mA mode gives the ability to simulate either sourcing or sinking sensor.
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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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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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PXI/PXIe Analog Output/Current Loop Simulator Module - 16 Channel
43-765-001
The 41/43-765-001 is a PXI/PXIe 16-channel Analog Output Module designed to meet the requirements of industrial control applications utilising current loops 4 – 20mA. It consists of up to four 16-bit, digital-to-analogue converters (DAC), capable of creating four current outputs each. Output current within 0mA - 4mA and 20mA - 24mA, give the ability to simulate error or extra signalling conditions. The ±24mA mode gives the ability to simulate either sourcing or sinking sensor.
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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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Current Loop Adapter
OP-1C
This adapter 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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Digital Electrical Network Analyzer
1826 NA
Standard Electric Works Co., Ltd
● Microprocessor-controlled.● Measures Earth Resistance without the need for poles in the ground or external measuring wires.● Earth measurement uses the real earth current path and the current generated by the electric network, without the need for any disconnection.● The Earth Resistance displayed is exactly the earth resistance that the earth current will need to go through if an earth fault occurs. No need to add all the bonding points and connection paths resistances.● Displays voltage supply at the transformer (Line to Neutral), without loading the transformer. Displays voltage between Line (Phase) and Earth (Ground), without drawing any current.● Measures the impedance of the line itself so you can analyze and differentiate between the multiples paths of the wiring.● Measures the Neutral Impedance. Single one smart push button operation; ON, Test, Scroll trough results and menus.● Checks wiring integrity (LEDs).● Auto off/auto ranging (software ranging). ● Combined prospective short circuit current, loop, individual wire and Earth Tester.● Voltage test L-N and L-E.● Loop test for L-E and L-N and PSC.● 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 large orders.
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PCI Express 16 Reed Relay Output
8004He
The 8004He 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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PXI Analog Output/Current Loop Simulator Module - 4 Channel
41-765-004
The 41/43-765-004 is an 4-channel Analog Output Module designed to meet the requirements of industrial control applications utilizing current loops 4 – 20mA. It consists of up to four 16-bit, digital-to-analogue converters (DAC), capable of creating four current outputs each. Output current within 0mA - 4mA and 20mA - 24mA, give the ability to simulate error or extra signaling conditions. The ±24mA mode gives the ability to simulate either sourcing or sinking sensor.
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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.
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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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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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HART Protocol Stack
softHART
SoftHART is the industry-standard smart HART (Highway Addressable Remote Transducer Protocol) communications stack for industrial automation. HART is a bidirectional protocol and communicates over existing 4-20 mA analog current loops, extending communication capabilities without the inconvenience of installing additional wiring.
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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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Remote Indicators
ABB field indicators provide a convenient way to access the field instruments data when they are located in remote or difficult to access areas. Powered directly from the 4-20 mA current loop, they require minimal effort to setup.
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PCI 8 Form C Relay Output / 8 Isolated Input Digital Interface
8011
The 8011 digital I/O interface provides 8 optically isolated inputs and 8 Form C relay outputs. The inputs protect the PC and other sensitive equipment from spikes and ground loop current that can be generated in industrial environments, while the outputs provide higher current capabilities (up to 2A) and are optimized for 24V operation.
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Loop-Powered Transmitters and Drivers
4-20mA
Loop-Powered Transmitters convert the output from proximity probes, seismic sensors, into a 4-20mA DC current, which is proportional to the input being measured. 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.
