CA2058591A1 - Computerized remote resistance measurement system with fault detection - Google Patents

Computerized remote resistance measurement system with fault detection

Info

Publication number
CA2058591A1
CA2058591A1 CA2058591A CA2058591A CA2058591A1 CA 2058591 A1 CA2058591 A1 CA 2058591A1 CA 2058591 A CA2058591 A CA 2058591A CA 2058591 A CA2058591 A CA 2058591A CA 2058591 A1 CA2058591 A1 CA 2058591A1
Authority
CA
Canada
Prior art keywords
multiplexer
output
input
rtd
wires
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA2058591A
Other languages
French (fr)
Other versions
CA2058591C (en
Inventor
Jonathan Castle
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MOORE INDUSTRIES-INTERNATIONAL Inc
Original Assignee
MOORE INDUSTRIES-INTERNATIONAL Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by MOORE INDUSTRIES-INTERNATIONAL Inc filed Critical MOORE INDUSTRIES-INTERNATIONAL Inc
Publication of CA2058591A1 publication Critical patent/CA2058591A1/en
Application granted granted Critical
Publication of CA2058591C publication Critical patent/CA2058591C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
    • G01K7/18—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer
    • G01K7/20—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer in a specially-adapted circuit, e.g. bridge circuit
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K15/00—Testing or calibrating of thermometers
    • G01K15/007—Testing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant

Abstract

A microprocessor-controlled remote resistance measurement system is disclosed wherein the connection leads to the three- or four-wire resistance temperature devices (RTDs) are multiplexed via a four-channel analog multiplexer at the input of the unit. A separate two-channel multiplexer is also used to multiplex a fifth input for measurement of a reference resistor. The output of the multiplexer is coupled to a voltage-to-frequency converter, wherein the frequency output is utilized as an input to the microprocessor-based controller. The microcontroller can check for broken wires by addressing the multiplexers to individually isolate any of the connecting wires to the remote RTD sensors. The output of the multiplexer is monitored in a Test Mode by connecting a known impedance to the multiplexer output to determine if any RTD
connections are defective. If one of the voltage sensing wires is faulty, the known impedance will cause an erroneous frequency reading into the microcontroller, which will then provide an indication on the display for determining exactly which RTD wire is broken. Only two address lines are used to control the five multiplexer channels through the use of a function selector circuit and a two-stage measurement cycle.
CA002058591A 1991-07-01 1991-12-30 Computerized remote resistance measurement system with fault detection Expired - Fee Related CA2058591C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US724,120 1991-07-01
US07/724,120 US5317520A (en) 1991-07-01 1991-07-01 Computerized remote resistance measurement system with fault detection

Publications (2)

Publication Number Publication Date
CA2058591A1 true CA2058591A1 (en) 1993-01-02
CA2058591C CA2058591C (en) 1999-10-12

Family

ID=24909099

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002058591A Expired - Fee Related CA2058591C (en) 1991-07-01 1991-12-30 Computerized remote resistance measurement system with fault detection

Country Status (6)

Country Link
US (1) US5317520A (en)
EP (1) EP0521234B1 (en)
JP (1) JP3307677B2 (en)
AU (1) AU644929B2 (en)
CA (1) CA2058591C (en)
DE (1) DE69230354D1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112462737A (en) * 2020-11-18 2021-03-09 国网重庆市电力公司电力科学研究院 Method for constructing security control device RTDS dynamic simulation test system, test method and system
CN112763857A (en) * 2020-04-27 2021-05-07 天津市中力神盾电子科技有限公司 Fault arc detection method and product thereof

Families Citing this family (101)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4305314A1 (en) * 1993-02-20 1994-08-25 Mannesmann Kienzle Gmbh Arrangement for checking the function of a temperature sensor
US5669713A (en) * 1994-09-27 1997-09-23 Rosemount Inc. Calibration of process control temperature transmitter
US5741074A (en) * 1995-06-06 1998-04-21 Thermo Electrioc Corporation Linear integrated sensing transmitter sensor
US5616850A (en) * 1995-12-29 1997-04-01 Gas Research Institute Emissions measuring system and method
US5700090A (en) * 1996-01-03 1997-12-23 Rosemount Inc. Temperature sensor transmitter with sensor sheath lead
US5746511A (en) * 1996-01-03 1998-05-05 Rosemount Inc. Temperature transmitter with on-line calibration using johnson noise
US8290721B2 (en) 1996-03-28 2012-10-16 Rosemount Inc. Flow measurement diagnostics
US6539267B1 (en) 1996-03-28 2003-03-25 Rosemount Inc. Device in a process system for determining statistical parameter
US7085610B2 (en) 1996-03-28 2006-08-01 Fisher-Rosemount Systems, Inc. Root cause diagnostics
US6907383B2 (en) 1996-03-28 2005-06-14 Rosemount Inc. Flow diagnostic system
US7254518B2 (en) * 1996-03-28 2007-08-07 Rosemount Inc. Pressure transmitter with diagnostics
US6017143A (en) 1996-03-28 2000-01-25 Rosemount Inc. Device in a process system for detecting events
US6654697B1 (en) 1996-03-28 2003-11-25 Rosemount Inc. Flow measurement with diagnostics
US7949495B2 (en) 1996-03-28 2011-05-24 Rosemount, Inc. Process variable transmitter with diagnostics
US6754601B1 (en) 1996-11-07 2004-06-22 Rosemount Inc. Diagnostics for resistive elements of process devices
US6449574B1 (en) 1996-11-07 2002-09-10 Micro Motion, Inc. Resistance based process control device diagnostics
US6519546B1 (en) 1996-11-07 2003-02-11 Rosemount Inc. Auto correcting temperature transmitter with resistance based sensor
US5956663A (en) * 1996-11-07 1999-09-21 Rosemount, Inc. Signal processing technique which separates signal components in a sensor for sensor diagnostics
US6601005B1 (en) 1996-11-07 2003-07-29 Rosemount Inc. Process device diagnostics using process variable sensor signal
US5828567A (en) * 1996-11-07 1998-10-27 Rosemount Inc. Diagnostics for resistance based transmitter
US6434504B1 (en) 1996-11-07 2002-08-13 Rosemount Inc. Resistance based process control device diagnostics
US6369563B1 (en) 1996-11-23 2002-04-09 Mts Systems Corporation Method for high resolution measurement of a position
AU1688497A (en) * 1996-12-19 1998-07-15 Mts Systems Corporation Method for high resolution measurement of a time period
EP0948759B1 (en) * 1996-12-31 2002-08-07 Rosemount Inc. Device in a process system for validating a control signal from a field device
US5929344A (en) * 1997-07-28 1999-07-27 Micro Motion, Inc. Circuitry for reducing the number of conductors for multiple resistive sensors on a coriolis effect mass flowmeter
EP1023650B1 (en) 1997-10-13 2003-09-24 Rosemount Inc. Communication technique for field devices in industrial processes
WO1999060579A2 (en) * 1998-05-20 1999-11-25 The Foxboro Company Three-wire rtd interface
US6243077B1 (en) 1998-11-18 2001-06-05 Boourns, Inc. Sensor and circuit architecture for three axis strain gauge pointing device and force transducer
US6611775B1 (en) 1998-12-10 2003-08-26 Rosemount Inc. Electrode leakage diagnostics in a magnetic flow meter
US6615149B1 (en) 1998-12-10 2003-09-02 Rosemount Inc. Spectral diagnostics in a magnetic flow meter
US7206646B2 (en) * 1999-02-22 2007-04-17 Fisher-Rosemount Systems, Inc. Method and apparatus for performing a function in a plant using process performance monitoring with process equipment monitoring and control
US6298454B1 (en) 1999-02-22 2001-10-02 Fisher-Rosemount Systems, Inc. Diagnostics in a process control system
US7562135B2 (en) * 2000-05-23 2009-07-14 Fisher-Rosemount Systems, Inc. Enhanced fieldbus device alerts in a process control system
US6633782B1 (en) 1999-02-22 2003-10-14 Fisher-Rosemount Systems, Inc. Diagnostic expert in a process control system
US8044793B2 (en) 2001-03-01 2011-10-25 Fisher-Rosemount Systems, Inc. Integrated device alerts in a process control system
US6356191B1 (en) 1999-06-17 2002-03-12 Rosemount Inc. Error compensation for a process fluid temperature transmitter
US7010459B2 (en) 1999-06-25 2006-03-07 Rosemount Inc. Process device diagnostics using process variable sensor signal
WO2001003099A1 (en) 1999-07-01 2001-01-11 Rosemount, Inc. Low power two-wire self validating temperature transmitter
US6505517B1 (en) 1999-07-23 2003-01-14 Rosemount Inc. High accuracy signal processing for magnetic flowmeter
US6701274B1 (en) 1999-08-27 2004-03-02 Rosemount Inc. Prediction of error magnitude in a pressure transmitter
US6556145B1 (en) 1999-09-24 2003-04-29 Rosemount Inc. Two-wire fluid temperature transmitter with thermocouple diagnostics
US6612737B1 (en) * 1999-12-29 2003-09-02 Affymetrix, Inc. System and method for self-calibrating measurement
US6735484B1 (en) 2000-09-20 2004-05-11 Fargo Electronics, Inc. Printer with a process diagnostics system for detecting events
WO2002071173A2 (en) * 2001-03-01 2002-09-12 Fisher-Rosemount Systems, Inc. Data sharing in a process plant
US7720727B2 (en) 2001-03-01 2010-05-18 Fisher-Rosemount Systems, Inc. Economic calculations in process control system
US8073967B2 (en) 2002-04-15 2011-12-06 Fisher-Rosemount Systems, Inc. Web services-based communications for use with process control systems
US6970003B2 (en) 2001-03-05 2005-11-29 Rosemount Inc. Electronics board life prediction of microprocessor-based transmitters
US6629059B2 (en) 2001-05-14 2003-09-30 Fisher-Rosemount Systems, Inc. Hand held diagnostic and communication device with automatic bus detection
US6772036B2 (en) 2001-08-30 2004-08-03 Fisher-Rosemount Systems, Inc. Control system using process model
US20030193843A1 (en) * 2002-04-12 2003-10-16 Frank Krahe Method for high resolution measurement of a position
US7104684B2 (en) * 2002-11-29 2006-09-12 Sigmatel, Inc. On-chip digital thermometer to sense and measure device temperatures
DE10258366A1 (en) * 2002-12-12 2004-07-08 Endress + Hauser Wetzer Gmbh + Co Kg Method and device for measuring the resistance of a temperature-dependent resistance element
US7098669B2 (en) * 2003-10-01 2006-08-29 Flowline, Inc. Depth determining system
US9244111B2 (en) * 2003-10-17 2016-01-26 Ronald P. Clarridge Amperage/voltage loop calibrator with loop diagnostics
DE10359988A1 (en) * 2003-12-19 2005-07-14 Siemens Ag Measuring device, in particular temperature transmitter
US20050225345A1 (en) * 2004-04-08 2005-10-13 Solid State Measurements, Inc. Method of testing semiconductor wafers with non-penetrating probes
KR100677742B1 (en) * 2004-07-23 2007-02-02 삼성전자주식회사 Digital temperature sensor, System and Method to measure temperature
US9201420B2 (en) 2005-04-08 2015-12-01 Rosemount, Inc. Method and apparatus for performing a function in a process plant using monitoring data with criticality evaluation data
US8005647B2 (en) 2005-04-08 2011-08-23 Rosemount, Inc. Method and apparatus for monitoring and performing corrective measures in a process plant using monitoring data with corrective measures data
US8112565B2 (en) 2005-06-08 2012-02-07 Fisher-Rosemount Systems, Inc. Multi-protocol field device interface with automatic bus detection
DE102005029045A1 (en) * 2005-06-21 2007-01-04 Endress + Hauser Wetzer Gmbh + Co Kg Apparatus and method for determining and / or monitoring the temperature
US20070068225A1 (en) 2005-09-29 2007-03-29 Brown Gregory C Leak detector for process valve
US7367712B2 (en) * 2006-02-06 2008-05-06 National Instruments Corporation RTD measurement unit including detection mechanism for automatic selection of 3-wire or 4-wire RTD measurement mode
US7953501B2 (en) 2006-09-25 2011-05-31 Fisher-Rosemount Systems, Inc. Industrial process control loop monitor
US8788070B2 (en) * 2006-09-26 2014-07-22 Rosemount Inc. Automatic field device service adviser
EP2074385B2 (en) 2006-09-29 2022-07-06 Rosemount Inc. Magnetic flowmeter with verification
US7658539B2 (en) * 2006-12-04 2010-02-09 Rosemount Inc. Temperature sensor configuration detection in process variable transmitter
US8898036B2 (en) 2007-08-06 2014-11-25 Rosemount Inc. Process variable transmitter with acceleration sensor
DE102007038060A1 (en) * 2007-08-10 2009-02-12 Endress + Hauser Wetzer Gmbh + Co. Kg Device for determining and / or monitoring a process variable
US8301676B2 (en) 2007-08-23 2012-10-30 Fisher-Rosemount Systems, Inc. Field device with capability of calculating digital filter coefficients
US7702401B2 (en) 2007-09-05 2010-04-20 Fisher-Rosemount Systems, Inc. System for preserving and displaying process control data associated with an abnormal situation
US8055479B2 (en) 2007-10-10 2011-11-08 Fisher-Rosemount Systems, Inc. Simplified algorithm for abnormal situation prevention in load following applications including plugged line diagnostics in a dynamic process
US8294451B2 (en) * 2007-12-03 2012-10-23 Texas Instruments Incorporated Smart sensors for solar panels
US8182139B2 (en) * 2008-05-30 2012-05-22 Apple Inc. Calibration of temperature sensing circuitry in an electronic device
JP4274385B1 (en) * 2008-07-28 2009-06-03 株式会社オーバル Temperature measurement circuit in a flow meter
US7921734B2 (en) * 2009-05-12 2011-04-12 Rosemount Inc. System to detect poor process ground connections
US8556505B2 (en) * 2009-09-18 2013-10-15 Cummins Ip, Inc. Apparatus, system, and method for accurately reading high and low temperatures
US8314709B2 (en) * 2009-10-05 2012-11-20 Pratt & Whitney Canada Corp. Fire detection fault enhancement
US8864378B2 (en) 2010-06-07 2014-10-21 Rosemount Inc. Process variable transmitter with thermocouple polarity detection
US8449181B2 (en) * 2010-08-26 2013-05-28 Rosemount Inc. Process fluid temperature measurement
US9207670B2 (en) 2011-03-21 2015-12-08 Rosemount Inc. Degrading sensor detection implemented within a transmitter
US9927788B2 (en) 2011-05-19 2018-03-27 Fisher-Rosemount Systems, Inc. Software lockout coordination between a process control system and an asset management system
CN102707153A (en) * 2012-06-28 2012-10-03 哈尔滨工业大学 Contact resistance measuring system and method based on voltage-frequency conversion method
US9052240B2 (en) 2012-06-29 2015-06-09 Rosemount Inc. Industrial process temperature transmitter with sensor stress diagnostics
DE102012107090A1 (en) * 2012-08-02 2014-02-06 Phoenix Contact Gmbh & Co. Kg Multi-conductor measuring device for detecting a faulty, temperature-dependent resistance sensor
US9228905B2 (en) 2012-08-21 2016-01-05 General Electric Company RTD measurement device
US9207129B2 (en) 2012-09-27 2015-12-08 Rosemount Inc. Process variable transmitter with EMF detection and correction
US9602122B2 (en) 2012-09-28 2017-03-21 Rosemount Inc. Process variable measurement noise diagnostic
DE102012220738A1 (en) * 2012-11-14 2014-05-15 Robert Bosch Gmbh Measuring circuit for determining resistance value of sensor resistor element for motor vehicle control device, has power supply terminal, which is electrically connected with pole of supply voltage source
US9297846B2 (en) 2012-12-01 2016-03-29 Keysight Technologies, Inc. Continuous broken sense lead detection system
US9222844B2 (en) * 2013-02-25 2015-12-29 Rosemount Inc. Process temperature transmitter with improved sensor diagnostics
CN105339769A (en) * 2013-06-28 2016-02-17 Pr电子股份公司 System and method for detection of wire breakage
CN103558841B (en) * 2013-11-05 2016-05-11 国家电网公司 The closed cycle simulation test method of the low-voltage capacitance compensating Setup Controller based on RTDS
JP6092129B2 (en) * 2014-01-16 2017-03-08 アズビル株式会社 Temperature measuring system and temperature measuring instrument
FR3038053B1 (en) * 2015-06-26 2019-04-05 Continental Automotive France TEMPERATURE MEASURING DEVICE
US10024728B2 (en) * 2015-10-09 2018-07-17 Linear Technology Llc Circuit and arrangement for 3-wire measurements with input protection
US10310462B2 (en) * 2016-05-05 2019-06-04 Honeywell International Inc. System and apparatus for sustaining process temperature measurement for RTD lead wire break
DE102020115090A1 (en) * 2020-06-05 2021-12-09 WAGO Verwaltungsgesellschaft mit beschränkter Haftung CIRCUIT FOR ANALOG-DIGITAL CONVERSION
CN112485599A (en) * 2020-12-08 2021-03-12 国网四川省电力公司电力科学研究院 Feeder terminal FTU automatic checkout device of embedding RTDS platform
WO2024047736A1 (en) * 2022-08-30 2024-03-07 理化工業株式会社 Temperature measurement device and abnormality detection method
CN116381657B (en) * 2023-06-07 2023-08-25 天津知海科技有限公司 Method and device for monitoring faults of transmitting channel, sonar transmitter and storage medium

Family Cites Families (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3911745A (en) * 1974-12-13 1975-10-14 Honeywell Inc Resistance reference junction compensator
US4102199A (en) * 1976-08-26 1978-07-25 Megasystems, Inc. RTD measurement system
JPS5369680A (en) * 1976-12-02 1978-06-21 Sumitomo Metal Ind Insulation resistance measuring device
JPS53116857A (en) * 1977-03-22 1978-10-12 Hokushin Electric Works Electric resistanceecurrent transformer
US4130019A (en) * 1977-06-09 1978-12-19 Nitschke John Stephen Self-compensating thermocouple reading circuit
US4122719A (en) * 1977-07-08 1978-10-31 Environmental Systems Corporation System for accurate measurement of temperature
US4201088A (en) * 1978-12-04 1980-05-06 Yellow Springs Instrument Company, Inc. Differential measuring system
DE2910608C2 (en) * 1979-03-17 1981-12-17 Kernforschungsanlage Jülich GmbH, 5170 Jülich Measuring device for practically simultaneous? T, T measurement
AU556751B2 (en) * 1981-10-26 1986-11-20 Sherwood Services Ag Return electrode monitoring system
US4575806A (en) * 1982-03-26 1986-03-11 Gould, Inc. Precision temperature measuring system
HU206161B (en) * 1985-01-30 1992-08-28 Tatabanyai Banyak Vallalat Device for indicating kinetic processes in situ, in a solid medium
FR2577480B1 (en) * 1985-02-21 1987-12-11 Labinal DEVICE FOR MEASURING BRAKE TEMPERATURES AND TIRE PRESSURES ON VEHICLE WHEEL TRAINS AND ESPECIALLY AIRCRAFT
US5012411A (en) * 1985-07-23 1991-04-30 Charles J. Policastro Apparatus for monitoring, storing and transmitting detected physiological information
GB8616276D0 (en) * 1986-07-03 1986-08-13 Racal Chubb Ltd Data acquisition system
US4954782A (en) * 1987-05-08 1990-09-04 The Boeing Company Self-checking ohmmeter that checks for contact resistance of its probes
US4989154A (en) * 1987-07-13 1991-01-29 Mitsubishi Petrochemical Company Ltd. Method of measuring resistivity, and apparatus therefor
DE3725752A1 (en) * 1987-08-04 1989-03-02 Vdo Schindling METHOD AND DEVICE FOR DISPLAYING THE LIQUID LEVEL IN A MOTOR VEHICLE TANK
US4859834A (en) * 1988-06-15 1989-08-22 Letco Management Company, Inc. Power controller for heat tracing cable which responds to ambient temperature
DE3933311A1 (en) * 1989-10-05 1991-04-18 Endress Hauser Gmbh Co TEMPERATURE MEASURING
US5143452A (en) * 1991-02-04 1992-09-01 Rockwell International Corporation System for interfacing a single sensor unit with multiple data processing modules

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112763857A (en) * 2020-04-27 2021-05-07 天津市中力神盾电子科技有限公司 Fault arc detection method and product thereof
CN112763857B (en) * 2020-04-27 2022-03-29 天津市中力神盾电子科技有限公司 Fault arc detection method and product thereof
CN112462737A (en) * 2020-11-18 2021-03-09 国网重庆市电力公司电力科学研究院 Method for constructing security control device RTDS dynamic simulation test system, test method and system
CN112462737B (en) * 2020-11-18 2022-03-08 国网重庆市电力公司电力科学研究院 Method for constructing security control device RTDS dynamic simulation test system, test method and system

Also Published As

Publication number Publication date
JP3307677B2 (en) 2002-07-24
EP0521234A3 (en) 1995-03-08
CA2058591C (en) 1999-10-12
EP0521234B1 (en) 1999-12-01
AU644929B2 (en) 1993-12-23
DE69230354D1 (en) 2000-01-05
JPH05215804A (en) 1993-08-27
US5317520A (en) 1994-05-31
AU1007592A (en) 1993-01-07
EP0521234A2 (en) 1993-01-07

Similar Documents

Publication Publication Date Title
CA2058591A1 (en) Computerized remote resistance measurement system with fault detection
JPH03504048A (en) temperature measurement circuit
JPS5862795A (en) Cascade monitor
US4589073A (en) Apparatus for determining prospective short circuit current
KR920015137A (en) Precision measurement method of low resistance value
ATE23759T1 (en) DIRECT CURRENT DETECTION SYSTEM.
US4777473A (en) Alarm system incorporating dynamic range testing
US4558426A (en) Transducer multiplexer
CN206876120U (en) A kind of deformeter
JPS58182391A (en) Remote control device
JP4464217B2 (en) Strain measuring device and strain gauge discrimination method
RU2028641C1 (en) Serviceability check method for measuring information acquisition circuits
RU94032784A (en) Method of serviceability testing of measurement data capture circuits
ES1026077U (en) Device for the visual indication of operating anomalies in small power boilers. (Machine-translation by Google Translate, not legally binding)
CN216411894U (en) Fault self-diagnosis self-recovery vibrating wire monitoring system
RU1772783C (en) Device for diagnostics of discrete circuits in automatics
RU2007874C1 (en) Device for test of insulation breaks in cable line
KR200229723Y1 (en) Tester of Thermal difference transmitter and Resistance thermo detector
SU458849A1 (en) Multichannel telemetering device
JPH0431680Y2 (en)
SU917138A1 (en) Device for checking correctness of bundled conductors wiring
SU868776A1 (en) Device for detecting faults of an object
SU1737377A1 (en) Device for automatic control of interjoint wiring of electric connections
SU1046716A2 (en) Electrical circuit automatic checking device
SU390551A1 (en) ALARM DEVICE

Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed