Product Short Description

Product Introduction

This is a compact DIN rail mounted microprocessor-based signal isolation transmitter dedicated for industrial temperature measurement. It converts weak thermocouple or RTD resistance temperature signals into standard 4-20mA DC analog output signals, with full galvanic isolation between input, output and power supply circuits to eliminate ground loop interference in complex industrial wiring environments.
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Yokogawa NFJT100-S10E
Yokogawa NFJT100-S10E - Image 2

Description

Core Technical Specifications & Performance Parameters

  1. Input Signal Types
    • Thermocouple Input: K, E, J, T, R, S, B, N standard thermocouple types
    • RTD Resistance Input: Pt100, JPt100 platinum resistance temperature sensors
  2. Standard Output Signal: 4mA ~ 20mA DC two-wire loop-powered analog signal
  3. Measurement Accuracy: ±0.1% of full measurement span
  4. Signal Response Time: 90ms fast conversion response
  5. Galvanic Isolation Strength: 1500V AC dielectric isolation between input/output/power loops
  6. Power Supply Range: 12V DC ~ 45V DC two-wire loop power supply
  7. Operating Temperature Range: -40℃ ~ +85℃ wide industrial temperature range
  8. Physical Dimensions: 72mm(H) × 24mm(W) × 127mm(D), ultra-narrow 24mm width to save cabinet installation space
  9. Net Weight: 160g
  10. EMC Compliance Standard: IEC 61326-1 industrial electromagnetic compatibility
  11. Explosion-Proof Certifications: ATEX, FM, CSA, TIIS, IECEx, NEPSI intrinsic safety approval for hazardous area installation

Function & Feature Highlights

  1. Universal multi-type temperature input support, single module compatible with all mainstream industrial thermocouple and RTD sensors
  2. High-precision microprocessor signal processing circuit, software programmable zero/span calibration without physical potentiometer adjustment
  3. Complete galvanic three-way isolation (input, output, power supply) to completely eliminate ground loop noise and common-mode signal interference
  4. Built-in sensor burnout detection function; automatically output fixed upper/lower limit current signal when thermocouple wire breaks or RTD circuit open-circuits
  5. Compact ultra-narrow 24mm width DIN rail mounting design, maximizes electrical cabinet internal space utilization rate
  6. Full intrinsic safety explosion-proof certification, suitable for installation in Zone 0/1/2 hazardous flammable gas industrial environments
  7. Front panel terminal wiring design, convenient on-site wiring, terminal screw clamping structure for stable wire fixation under equipment vibration
  8. Software configurable via Yokogawa VJ77 PC parameter setting tool; users can modify measurement range, sensor type and burnout logic on-site without replacing hardware

Working Principle

The NFJT100-S10E transmitter adopts a two-wire loop power supply architecture; the 4-20mA output loop simultaneously supplies working power for the internal microprocessor circuit. Weak temperature-dependent resistance or millivolt voltage signals from field thermocouple/RTD sensors are first filtered by an analog low-pass filter circuit to remove high-frequency industrial electromagnetic noise. The filtered analog signal is converted to digital data via a high-resolution ADC chip, then processed by the embedded microprocessor with built-in temperature compensation algorithms to eliminate cold-junction thermocouple measurement error. The calibrated digital temperature value is converted back to a linear 4-20mA DC analog output signal via a DAC circuit, transmitted to remote DCS/PLC analog input modules through two-wire shielded cable. The internal isolation transformer circuit blocks DC common-mode voltage between field sensor loop and control room cabinet power loop to prevent measurement drift caused by ground potential difference.

Material Composition & Structural Features

  1. Housing Material: Die-cast lightweight aluminum alloy shell, anti-corrosion anodized surface treatment, high mechanical shock resistance
  2. Internal Circuit Board: SMT surface mount industrial PCB, isolated transformer isolation components, precision metal film calibration resistors
  3. Mechanical Structure: Standard 35mm DIN rail snap-on mounting base, spring buckle fixed structure for fast installation and disassembly; front panel equipped with screw-type wiring terminals with anti-loosening spring washers
  4. Protection Structure: Fully sealed internal circuit compartment, IP30 front panel dustproof protection grade; terminal compartment separated from main circuit to prevent wiring dust contamination

Installation Requirements

  1. Mounting Method: Snap onto standard 35mm DIN mounting rail inside indoor electrical control cabinet only
  2. Wiring Specification: Use shielded twisted pair cable for field temperature sensor input wiring; shield layer single-end grounded inside control cabinet to reduce electromagnetic interference
  3. Power Wiring Restriction: Strictly follow two-wire loop wiring diagram; do not connect external separate DC power supply to input terminal side, which will damage internal isolation circuit
  4. Hazardous Area Installation Rules: When installing in explosion-proof hazardous zones, strictly follow IECEx/ATEX intrinsic safety wiring specifications, use certified explosion-proof cable glands and barrier isolation safety barriers
  5. Ambient Installation Limits: Avoid installation positions with direct high-temperature heat radiation, water splash, corrosive chemical gas or heavy dust accumulation; relative humidity must remain below 90% non-condensing

Application Scenarios

  1. Petrochemical, oil refining, natural gas chemical plant temperature measurement and signal transmission systems
  2. Thermal power plant boiler furnace, steam pipeline, turbine bearing temperature monitoring
  3. Pharmaceutical fine chemical, food beverage, brewery fermentation tank temperature measurement
  4. Metallurgical steel smelting furnace, hot rolling mill high-temperature workpiece temperature detection
  5. Offshore oil platform, chemical tank storage area hazardous zone temperature monitoring
  6. Water treatment plant heating pipeline, sludge digestion tank temperature signal conversion

Operation & Maintenance Precautions

  1. All wiring modification and parameter configuration operations must be performed after cutting off the 4-20mA loop power supply to avoid transient voltage surge damaging internal ADC circuit
  2. When calibrating zero and span measurement range via VJ77 configuration software, ensure field temperature sensor is placed at stable known reference temperature point to guarantee calibration accuracy
  3. Regularly inspect wiring terminal screw tightness; loose terminals will cause unstable temperature signal output and measurement drift
  4. Do not disassemble the aluminum alloy housing without authorization; internal isolation transformer and precision calibration components are sensitive to mechanical impact and vibration
  5. Avoid long-term continuous operation at ambient temperature exceeding +85℃; high temperature will accelerate internal electronic component aging and reduce measurement accuracy service life
  6. For hazardous area installed transmitters, perform annual explosion-proof wiring inspection to check cable gland sealing integrity and ground wire connection reliability

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