Intrinsically Safe Isolating Barriers

3系列安全栅

LW3 Series Isolation Safety Barrier

I. General Information of LW3 Series Isolation Safety Barrier

(I) Core Positioning & Function

The LW3 Series Isolation Safety Barrier is an intrinsically safe associated device connecting instruments in the hazardous area of industrial sites and instruments in the safe area of the control room. It can isolate and transmit signals (such as current, communication, thermal resistance, thermocouple, and switch signal) from the hazardous area to the safe area, realizing complete isolation of input-output-power supply channels.

It can also convert and distribute signals (such as current, voltage, resistance, and thermocouple) to meet the needs of industrial automation control systems, while solving system interference problems and ensuring stable and reliable operation.

(II) General Technical Parameters

Parameter Category Specific Parameters
Power Supply Voltage range: 20-30VDC; conventional rated voltage: 24VDC
Transmission Accuracy ±0.1%F·S (±0.2%F·S for some thermal resistance types)
Temperature Drift ±0.01%F·S/℃ (≤50ppm/℃ for some thermal resistance types, -20~+60℃)
Isolation Performance Withstand voltage between input-output-power supply terminals: ≥1500VAC/1min (50Hz); insulation resistance: ≥100MΩ/500VDC
Environmental Conditions Operating temperature: -20℃~+60℃; storage temperature: -40℃~+80℃; operating relative humidity: 5-95%RH (no condensation); operating atmospheric pressure: 80-106KPa
Electromagnetic Compatibility Compliant with GB/T18268 (IEC61326-1)
Installation Method 35mm standard DIN rail clip-on installation; vertical or horizontal installation supported; dense installation supported
Overall Dimension Conventional: W13×H110×D120mm (width×height×depth); multi-channel models (e.g., 2-in-2-out, 4-in-4-out): W18×H110×D120mm; overall weight: approx. 95g~110g
Wiring Specification Plug-in terminals (hot-swappable); wiring cables: 0.5~2.5mm² single-core or multi-core cables; connected by slotted cylindrical head M3 screws (torque ≤0.8Nm)
Certification Compliance Safety certifications: SIL3 functional safety certification, explosion-proof certification (mark: [Exia Ga]IIC[Exia Da]III C), 3C certification, EU CE certification; System certifications: ISO9001 Quality Management System, ISO14001 Environmental Management System, ISO45001 Occupational Health and Safety Management System; Executive standards: GB/T3836.1-2021 *Explosive Atmospheres - Part 1: General Requirements for Equipment*, GB/T3836.4-2021 *Explosive Atmospheres - Part 4: Equipment Protected by Intrinsic Safety "i"*, GB/T28471.1-2012, GB/T28472.2-2012, GB/T28473.1-2012
Other Features Some models have LED power indicators and fault alarm indicators (e.g., power indicator flashes when wire break alarm occurs); some intelligent models have USB interfaces, supporting online configuration (setting sensor graduation number, range, etc.) by connecting to a computer

II. Detailed Information of Each Model Isolation Safety Barrier

(I) Analog Input Isolation Safety Barrier

1. LW3151 (1-in-1-out)

Overview: Provides 16~28VDC power distribution for two-wire/three-wire transmitters in the hazardous area, receives their 4~20mA and other DC current/voltage signals, and outputs corresponding DC current/voltage signals to the safe area control system after isolation and anti-interference processing. Three-terminal isolation of input-output-power supply, with LED power indicator.

  • Input (Hazardous Area): Signal types: DC current (4~20mADC, 0~20mADC, 0~10mADC or specified range), DC voltage (1~5VDC, 0~5VDC, 0~10VDC or specified range); input impedance: 50Ω (current signal); maximum input current limit: approx. 30mADC
  • Output (Safe Area): Signal type matches input; allowable load for current output: 0~500Ω; output ripple: <50mVp-p
  • Power Supply & Power Consumption: 20~30VDC power supply (rated 24VDC); current consumption at 24VDC: approx. 50mA
  • Intrinsically Safe Explosion-Proof Parameters: Explosion-proof mark: [Exia Ga]IIC[Exia Da]III C; Um=250V AC/DC; Terminals 7-8, 7-10: Uo=28VDC, Io=93mA, Po=651mW, Co=0.05μF, Lo=2.4mH; Terminals 9-10: Uo=5.5VDC, Io=286mA, Po=0.4W, Co=40μF, Lo=0.3mH

2. LW3153 (1-in-2-out)

Overview: Similar in function to LW3151, the difference is that 1 input corresponds to 2 independent outputs, which can transmit signals to two control systems in the safe area at the same time. Compatible with two-wire/three-wire transmitters, with LED power indicator.

  • Input (Hazardous Area): Same as LW3151, including 16~28VDC transmitter power distribution; maximum input current: 30mADC
  • Output (Safe Area): 2 independent outputs; each output has the same signal type, load (0~500Ω) and ripple (<50mVp-p) as LW3151
  • Power Supply & Power Consumption: 20~30VDC power supply (rated 24VDC); current consumption at 24VDC: approx. 70mA
  • Intrinsically Safe Explosion-Proof Parameters: Same as LW3151

3. LW3154 (2-in-2-out)

Overview: 2 independent inputs, providing 16~28VDC power distribution for two two-wire/three-wire transmitters in the hazardous area respectively, receiving their signals and outputting to the safe area after isolation. Three-terminal isolation of input-output-power supply, with LED power indicator. Overall dimension: W18×H110×D120mm.

  • Input (Hazardous Area): Each input is the same as LW3151, including power distribution and maximum input current limit of 30mADC
  • Output (Safe Area): 2 independent outputs; each output has the same parameters as LW3151
  • Power Supply & Power Consumption: 20~30VDC power supply (rated 24VDC); current consumption at 24VDC: approx. 110mA
  • Intrinsically Safe Explosion-Proof Parameters: Explosion-proof mark: [Exia Ga]IIC[Exia Da]III C; Um=250V AC/DC; Terminals 1-2, 1-3, 4-5, 4-6: Uo=28VDC, Io=93mA, Po=651mW, Co=0.05μF, Lo=2.4mH; Terminals 2-3, 5-6: Uo=5.5VDC, Io=286mA, Po=0.4W, Co=40μF, Lo=0.3mH

(II) Analog Output Isolation Safety Barrier

1. LW3145 (1-in-1-out)

Overview: Receives 4~20mA, 0~20mADC current signals output by DCS/PLC in the safe area, and outputs 4~20mADC signals to the hazardous area to drive intrinsic safety equipment (such as valve positioners and electrical converters) after isolation and interference suppression. Three-terminal isolation of input-output-power supply, with LED power indicator.

  • Input (Safe Area): DC current: 4~20mADC, 0~20mADC; input impedance: 50Ω
  • Output (Hazardous Area): DC current: 4~20mADC; allowable load for output: 0~750Ω; output ripple: <50mVp-p
  • Power Supply & Power Consumption: 20~30VDC power supply (rated 24VDC); current consumption at 24VDC: approx. 40mA
  • Intrinsically Safe Explosion-Proof Parameters: Explosion-proof mark: [Exia Ga]IIC[Exia Da]III C; Um=250V AC/DC; Terminals 7-8: Uo=28VDC, Io=93mA, Po=0.65W, Co=0.05μF, Lo=2.4mH

2. LW3105 (2-in-2-out)

Overview: 2 independent inputs, receiving two 4~20mA, 0~20mADC signals from DCS/PLC in the safe area respectively, and outputting two 4~20mADC signals to the hazardous area after isolation to drive two intrinsic safety execution devices. Three-terminal isolation of input-output-power supply, with LED power indicator.

  • Input (Safe Area): Each input is the same as LW3145; input impedance: 50Ω
  • Output (Hazardous Area): 2 independent outputs; each output is 4~20mADC, load: 0~750Ω, ripple: <50mVp-p
  • Power Supply & Power Consumption: 20~30VDC power supply (rated 24VDC); current consumption at 24VDC: approx. 65mA
  • Intrinsically Safe Explosion-Proof Parameters: Explosion-proof mark: [Exia Ga]IIC[Exia Da]III C; Um=250V AC/DC; Terminals 7-8, 9-10: Uo=28VDC, Io=93mA, Po=0.65W, Co=0.05μF, Lo=2.4mH

(III) Intelligent Temperature Transmitter Isolation Safety Barrier

1. LW3117 (1-in-1-out)

Overview: Receives thermal resistance, thermocouple, millivolt or resistance signals from the hazardous area, and outputs standard DC signals to the safe area after isolation and linearization processing. Equipped with USB TYPE-C interface, supporting online configuration (setting input sensor graduation number and range) by connecting to a computer. It has wire break fault diagnosis and alarm function (power indicator flashes when alarming). Three-terminal isolation of input-output-power supply, plug-in terminals are hot-swappable.

  • Input (Hazardous Area): Thermal resistance (Pt100, Pt1000, Ni1000, Cu50, Cu100), thermocouple (K, J, E, T, N, R, S, B, W-Re), millivolt signal (-75~75mV), resistance signal (0~400Ω); range: any range of thermal resistance/thermocouple (note when ordering); thermocouple cold junction automatic compensation (range: -5~55℃, error: ±0.5℃); sensor fusing treatment: output maximum current; thermal resistance excitation current: 0.5mA; lead resistance: 0~20Ω (consistent length for two-wire/three-wire)
  • Output (Safe Area): DC current (4~20mADC, 0~20mADC, 0~10mADC or specified range), DC voltage (1~5VDC, 0~5VDC, 0~10VDC or specified range); allowable load for current output: 0~500Ω; output beyond/below range: 0~20mA; output ripple: <20mVp-p
  • Power Supply & Power Consumption: 20~30VDC power supply (rated 24VDC); current consumption at 24VDC: approx. 30mA
  • Comprehensive Performance: Transmission accuracy: ±0.1%F·S; response time: <500ms; temperature drift: ±0.01%F·S/℃
  • Intrinsically Safe Explosion-Proof Parameters: Explosion-proof mark: [Exia Ga]IIC[Exia Da]III C; Um=250V AC/DC; Terminals 7-8, 7-9: Uo=5.9VDC, Io=30mA, Po=45mW, Co=26μF, Lo=1mH

2. LW3118 (1-in-2-out)

Overview: Similar in function to LW3117, 1 input corresponds to 2 independent outputs, which can transmit temperature signals to two control systems in the safe area. Features such as USB configuration, wire break alarm and isolation method are the same as LW3117.

  • Input (Hazardous Area): Exactly the same as LW3117, including thermal resistance, thermocouple and other signals and related parameters
  • Output (Safe Area): 2 independent outputs; each output has the same signal type, load (0~500Ω) and ripple (<20mVp-p) as LW3117
  • Power Supply & Power Consumption: 20~30VDC power supply (rated 24VDC); current consumption at 24VDC: approx. 45mA
  • Comprehensive Performance & Intrinsically Safe Explosion-Proof Parameters: Same as LW3117

3. LW3121 (2-in-2-out)

Overview: 2 independent inputs, receiving two thermal resistance, thermocouple and other signals from the hazardous area respectively, and outputting to the safe area after processing and isolation. Equipped with USB configuration and wire break alarm function. Three-terminal isolation of input-output-power supply, plug-in terminals are hot-swappable. Overall dimension: W18×H110×D120mm.

  • Input (Hazardous Area): Each input is the same as LW3117
  • Output (Safe Area): 2 independent outputs; each output has the same parameters as LW3117
  • Power Supply & Power Consumption: 20~30VDC power supply (rated 24VDC); current consumption at 24VDC: approx. 60mA
  • Comprehensive Performance: Same as LW3117
  • Intrinsically Safe Explosion-Proof Parameters: Explosion-proof mark: [Exia Ga]IIC[Exia Da]III C; Um=250V AC/DC; Terminals 1-2, 1-3, 4-5, 4-6: Uo=5.9VDC, Io=30mA, Po=45mW, Co=26μF, Lo=1mH

(IV) Switch Input Isolation Safety Barrier

1. LW3111 (1-in-1-out)

Overview: Receives NAMUR-type proximity sensor signals (compliant with DIN19234 standard) or passive switch contact signals from the hazardous area, and transmits them to the safe area control system via relay contact, level signal or transistor output after isolation. Optional line fault detection function (LED red light on when fault occurs). Three-terminal isolation of input-output-power supply, with working power and switch status indicators. Plug-in terminals are hot-swappable. Overall dimension: W18×H110×D120mm.

  • Input (Hazardous Area): NAMUR-type proximity sensor signal (input >2.1mA for "ON", <2.1mA for "OFF"), passive switch contact; open-circuit voltage: 8V±0.5V; short-circuit current: approx. 4mA; switch threshold: approx. 1.55mA; hysteresis: 0.2~0.4mA
  • Output (Safe Area): Relay contact (single-pole changeover, capacity: 2A/30VDC, contact resistance: ≤0.2Ω, maximum open-circuit voltage: 26VDC, maximum short-circuit current: 30mADC); level signal (high level: 22~26VDC, low level: 0~1VDC, load resistance: ≥1kΩ); transistor (external power supply: ≤40V, output current: ≤40mA, collector output: high level=VCC/low level≤2.5V, emitter output: high level=VCC-2.5V/low level≤0.5V)
  • Power Supply & Power Consumption: 20~30VDC power supply (rated 24VDC); current consumption at 24VDC: approx. 30mA
  • Comprehensive Performance: Response time: <10ms
  • Intrinsically Safe Explosion-Proof Parameters: Explosion-proof mark: [Exia Ga]IIC[Exia Da]III C; Um=250V AC/DC; Terminals 2-1: Uo=10.5VDC, Io=22mA, Po=58mW, Co=1.7μF, Lo=10mH

2. LW3112 (1-in-2-out)

Overview: 1 input corresponds to 2 independent outputs, receives NAMUR proximity sensor or passive switch signals from the hazardous area, and outputs two relay/level/transistor signals to the safe area after isolation. Optional line fault detection, with indicators. Plug-in terminals are hot-swappable. Overall dimension: W18×H110×D120mm.

  • Input (Hazardous Area): Same as LW3111
  • Output (Safe Area): 2 independent outputs; each output has the same type and parameters as LW3111
  • Power Supply & Power Consumption: 20~30VDC power supply (rated 24VDC); current consumption at 24VDC: approx. 40mA
  • Comprehensive Performance & Intrinsically Safe Explosion-Proof Parameters: Same as LW3111 (intrinsically safe parameters: Terminals 2-1: Uo=10.5VDC, Io=22mA, etc.)

3. LW3122 (2-in-2-out)

Overview: 2 independent inputs, receiving two NAMUR proximity sensor or passive switch signals from the hazardous area respectively, and outputting to the safe area after isolation. Optional line fault detection, with indicators. Plug-in terminals are hot-swappable. Overall dimension: W18×H110×D120mm.

  • Input (Hazardous Area): Each input is the same as LW3111
  • Output (Safe Area): 2 independent outputs; each output has the same parameters as LW3111
  • Power Supply & Power Consumption: 20~30VDC power supply (rated 24VDC); current consumption at 24VDC: approx. 50mA
  • Comprehensive Performance: Response time: <10ms
  • Intrinsically Safe Explosion-Proof Parameters: Explosion-proof mark: [Exia Ga]IIC[Exia Da]III C; Um=250V AC/DC; Terminals 2-1, 5-4: Uo=10.5VDC, Io=22mA, Po=58mW, Co=1.7μF, Lo=10mH

4. LW3144 (4-in-4-out)

Overview: 4 independent inputs, receiving 4 NAMUR proximity sensor or passive switch signals from the hazardous area, and outputting 4 signals to the safe area after isolation. Optional line fault detection, with indicators. Plug-in terminals are hot-swappable. Overall dimension: W18×H110×D120mm.

  • Input (Hazardous Area): Each input is the same as LW3111
  • Output (Safe Area): 4 independent outputs; each output has the same parameters as LW3111
  • Power Supply & Power Consumption: 20~30VDC power supply (rated 24VDC); current consumption at 24VDC: approx. 60mA
  • Comprehensive Performance: Response time: <10ms
  • Intrinsically Safe Explosion-Proof Parameters: Explosion-proof mark: [Exia Ga]IIC[Exia Da]III C; Um=250V AC/DC; Terminals 2-1, 2-3, 5-4, 5-6: Uo=10.5VDC, Io=22mA, Po=58mW, Co=1.7μF, Lo=10mH

5. LW3131 (1-in-1-out, 3-wire type)

Overview: Receives 3-wire PNP/NPN switch signals from the hazardous area (specify type when ordering), and outputs to the safe area via relay/level/transistor after isolation. With power and switch status indicators. Plug-in terminals are hot-swappable. Overall dimension: W18×H110×D120mm.

  • Input (Hazardous Area): 3-wire PNP/NPN switch signal; power distribution voltage: approx. 16VDC (at 20mA); open-circuit voltage: ≤26VDC
  • Output (Safe Area): Same as LW3111 (relay/level/transistor output and parameters)
  • Power Supply & Power Consumption: 20~30VDC power supply (rated 24VDC); current consumption at 24VDC: approx. 60mA
  • Comprehensive Performance: Response time: <10ms
  • Intrinsically Safe Explosion-Proof Parameters: Explosion-proof mark: [Exia Ga]IIC[Exia Da]III C; Um=250V AC/DC; Terminals 1-3: Uo=10.5VDC, Io=22mA, Po=58mW, Co=1.7μF, Lo=10mH

6. LW3132 (2-in-2-out, 3-wire type)

Overview: 2 independent inputs, receiving two 3-wire PNP/NPN switch signals from the hazardous area, and outputting to the safe area after isolation. With indicators. Plug-in terminals are hot-swappable. Overall dimension: W18×H110×D120mm.

  • Input (Hazardous Area): Each input is the same as LW3131 (3-wire PNP/NPN signal, 16VDC power distribution, etc.)
  • Output (Safe Area): 2 independent outputs; each output has the same parameters as LW3111
  • Power Supply & Power Consumption: 20~30VDC power supply (rated 24VDC); current consumption at 24VDC: approx. 120mA
  • Comprehensive Performance: Response time: <10ms
  • Intrinsically Safe Explosion-Proof Parameters: Explosion-proof mark: [Exia Ga]IIC[Exia Da]III C; Terminals 1-3, 4-6: Uo=10.5VDC, Io=22mA, Po=58mW, Co=1.7μF, Lo=10mH

(V) Switch Output Isolation Safety Barrier

1. LW3124 (1-in-1-out)

Overview: Controls intrinsic safety equipment in hazardous areas (such as solenoid valves, alarms, light-emitting diodes) through dry contact switches, level signals or transistor signals in safe areas; no energy storage equipment adaptation. Three-terminal isolation of input-output-power supply, with working power and switch status indicators. Plug-in terminals are hot-swappable. Overall dimension: W18×H110×D120mm.

  • Input (Safe Area): Dry contact switch (input current ≤3mA/8V, switch delay ≤2s), level signal (high level 4~24V, low level ≤1V), transistor (electrical capacity 30VDC/100mA)
  • Output (Hazardous Area): Logic voltage signal; minimum output voltage: 12V (at 45mA); maximum output voltage: 24V; maximum output current: 45mA
  • Power Supply & Power Consumption: 20~30VDC power supply (rated 24VDC); current consumption at 24VDC: approx. 75mA
  • Intrinsically Safe Explosion-Proof Parameters: Explosion-proof mark: [Exia Ga]IIC[Exia Da]III C; Um=250V AC/DC; Terminals 1-2: Uo=25.2VDC, Io=140mA, Po=0.882W, Co=0.07μF, Lo=1mH

2. LW3130 (2-in-2-out)

Overview: 2 independent inputs, controlling two intrinsic safety devices in hazardous areas respectively through two control signals in safe areas. Three-terminal isolation of input-output-power supply, with indicators. Plug-in terminals are hot-swappable. Overall dimension: W18×H110×D120mm.

  • Input (Safe Area): Each input is the same as LW3124 (dry contact/level/transistor signal)
  • Output (Hazardous Area): 2 independent outputs; each output has the same parameters as LW3124 (12~24V, maximum 45mA)
  • Power Supply & Power Consumption: 20~30VDC power supply (rated 24VDC); current consumption at 24VDC: approx. 120mA
  • Intrinsically Safe Explosion-Proof Parameters: Explosion-proof mark: [Exia Ga]IIC[Exia Da]III C; Um=250V AC/DC; Terminals 1-2, 4-5: Uo=25.2VDC, Io=140mA, Po=0.882W, Co=0.07μF, Lo=1mH

(VI) Communication Signal Input Isolation Safety Barrier

1. LW3148 (RS-485, 1-in-1-out)

Overview: Realizes bidirectional communication of RS-485 half-duplex signals between hazardous area and safe area; can provide isolated power distribution for hazardous area equipment (note parameters when ordering). Three-terminal isolation of input-output-power supply, with working power and switch status indicators. Plug-in terminals are hot-swappable.

  • Input (Hazardous Area): RS-485 half-duplex signal (Terminals 7-8); power distribution output (Terminals 9-10): 5V/100mA, 9V/50mA, 12V/50mA, 15V/50mA (special can be customized)
  • Output (Safe Area): Standard RS-485 differential level; transmission delay ≤10μs; signal transmission rate ≤256kbps; transmission control mode: half-duplex; maximum baud rate: 300~115200bps (automatic detection of serial port signals); transmission distance: 1200m
  • Power Supply & Power Consumption: 20~30VDC power supply (rated 24VDC); current consumption ≤150mA (24V power supply, 24V/50mA power distribution)
  • Intrinsically Safe Explosion-Proof Parameters: Explosion-proof mark: [Exia Ga]IIC[Exia Da]III C; Um=250V AC/DC; Terminals 7-8: Uo=7.6VDC, Io=80mA, Po=0.152W, Co=7.0μF, Lo=5.0mH; Terminals 9-10: Uo=25.2VDC, Io=150mA, Po=0.945W, Co=0.08μF, Lo=0.5mH

2. LW3185 (CAN, 1-in-1-out)

Overview: Realizes bidirectional communication of CAN half-duplex signals between hazardous area and safe area; can provide isolated power distribution for hazardous area equipment (set via K1-K3 DIP switches). Three-terminal isolation of input-output-power supply, with indicators. Plug-in terminals are hot-swappable.

  • Input (Hazardous Area): Standard CAN half-duplex signal; transmission speed ≤1Mbps; power distribution output: 6V/100mA, 9V/50mA, 12V/50mA, 24V/50mA (DIP switch setting: 24V/50mA=K3-OFF, K2-OFF, K1-OFF; 12V/50mA=K3-ON, K2-OFF, K1-OFF; 9V/50mA=K3-ON, K2-ON, K1-OFF; 6V/100mA=K3-ON, K2-ON, K1-ON)
  • Output (Safe Area): Standard CAN half-duplex signal; transmission speed ≤1Mbps
  • Power Supply & Power Consumption: 20~30VDC power supply (rated 24VDC); current consumption ≤160mA (at 100mA output), ≤120mA (at 50mA output)
  • Intrinsically Safe Explosion-Proof Parameters: Explosion-proof mark: [Exia Ga]IIC[Exia Da]III C; Um=250V AC/DC; Terminals 1-2: Uo=7VDC, Io=82mA, Po=0.2W, Co=20μF, Lo=8mH; Terminals 4-5: Uo=28VDC, Io=264mA, Po=2W, Co=0.02μF, Lo=0.5mH

(VII) Frequency Signal Input Isolation Safety Barrier

1. LW3186 (1-in-1-out)

Overview: Receives frequency pulse signals from hazardous areas, and after isolation, shaping and amplification, transmits and outputs isolated current, voltage, frequency or relay switch signals to the safe area as required. It can provide power distribution for on-site primary instruments/sensors. Equipped with online fault self-diagnosis function, supporting PC configuration software to set signal types and ranges. Three-terminal isolation of input-output-power supply, plug-in terminals are hot-swappable. Overall dimension: W18×H110×D120mm.

  • Input (Hazardous Area): Frequency pulse signal; frequency range: 0.1~100kHz; pulse width ≥5μs; amplitude limit ≤30Vpp; input impedance: 1.5kΩ; signal trigger: low level 0~2V, high level 4~24V; signal resolution: 0.1Hz; power distribution voltage: 6V/9V/12V/15V optional (0.9W MAX, note when ordering)
  • Output (Safe Area): DC current (0(4)~20mA, load ≤550Ω, loop power supply optional), DC voltage (0(1)~5V load ≥1MΩ, 0(2)~10V load ≥2MΩ), frequency signal (collector/emitter output, load resistance ≥2kΩ), relay output (note when ordering)
  • Power Supply & Power Consumption: 18~36VDC power supply (with power reverse protection), rated 24VDC
  • Comprehensive Performance: System transmission accuracy: 0.1%F·S (25±2℃); temperature coefficient: 40ppm/℃ (typical value); response time: 0.5s (10%~90%); dielectric strength: ≥3000VAC (optocoupler isolation), ≥1500VAC (electromagnetic isolation); electromagnetic compatibility: compliant with IEC61326-3-1
  • Intrinsically Safe Explosion-Proof Parameters: Explosion-proof mark: [Exia Ga]IIC[Exia Da]III C; Um=250V AC/DC; Terminals 1-2: Uo=8.7VDC, Io=1mA, Po=3W, Co=5.0μF, Lo=1000mH

2. LW3187 (1-in-2-out)

Overview: 1 input corresponds to 2 independent outputs, receives frequency pulse signals from hazardous areas, and outputs two signals to the safe area after isolation and transmission. Functions such as power distribution, configuration and diagnosis are the same as LW3186. Plug-in terminals are hot-swappable. Overall dimension: W18×H110×D120mm.

  • Input (Hazardous Area): Same as LW3186, including frequency signal parameters and power distribution options
  • Output (Safe Area): 2 independent outputs; each output has the same type and parameters as LW3186
  • Power Supply & Power Consumption: 18~36VDC power supply (with reverse protection), rated 24VDC
  • Comprehensive Performance & Intrinsically Safe Explosion-Proof Parameters: Same as LW3186

3. LW3188 (2-in-2-out)

Overview: 2 independent inputs, receiving two frequency pulse signals from hazardous areas, and outputting to the safe area after isolation and transmission. Functions such as power distribution, configuration and diagnosis are the same as LW3186. Plug-in terminals are hot-swappable. Overall dimension: W18×H110×D120mm.

  • Input (Hazardous Area): Each input is the same as LW3186
  • Output (Safe Area): 2 independent outputs; each output has the same parameters as LW3186
  • Power Supply & Power Consumption: 18~36VDC power supply (with reverse protection), rated 24VDC
  • Comprehensive Performance & Intrinsically Safe Explosion-Proof Parameters: Same as LW3186

(VIII) Thermal Resistance Signal Isolation Safety Barrier

LW3119 (1-in-2-out)

Overview: Receives Pt100 thermal resistance signals from hazardous areas, and outputs 1 matching resistance signal and 1 current/voltage signal to the safe area after isolation and conversion. Equipped with USB interface for online configuration, with wire break fault diagnosis and alarm function (power indicator flashes when alarming). Three-terminal isolation of input-output-power supply, plug-in terminals are hot-swappable. Overall dimension: W18×H110×D120mm.

  • Input (Hazardous Area): Pt100 thermal resistance signal; range: any range of thermal resistance (note when ordering); lead resistance ≤20Ω; allowable input signal: two-wire/three-wire thermal resistance (0~350Ω)
  • Output (Safe Area): Output 1: 1:1 resistance output (matching input thermal resistance); Output 2: DC current (4~20mADC, 0~20mADC, 0~10mADC or specified range), DC voltage (1~5VDC, 0~5VDC, 0~10VDC or specified range); allowable load for current output: 0~500Ω; output beyond/below range: 0~20mA; output ripple: <10mVp-p
  • Power Supply & Power Consumption: 20~30VDC power supply (rated 24VDC); current consumption at 24VDC: approx. 70mA
  • Comprehensive Performance: Transmission accuracy: ±0.2%F·S; temperature drift: ≤50ppm/℃ (-20~+60℃); response time: <2s
  • Intrinsically Safe Explosion-Proof Parameters: Explosion-proof mark: [Exia Ga]IIC[Exia Da]III C; Um=250V AC/DC; Terminals 1-3: Uo=7VDC, Io=3mA, Po=16.8mW, Co=20μF, Lo=1mH

III. Application Fields and Adaptable Equipment

(I) Application Fields

Petrochemical, iron and steel metallurgy, military equipment, gas, electric power, environmental protection, biomedicine, water conservancy and water affairs, new materials and new energy, equipment supporting and other industrial control fields. It can be used in 0 zone, 1 zone, 2 zone and IIA, IIB, IIC hazardous zones (T4~T6 temperature classes).

(II) Adaptable Equipment

Area Adaptable Equipment
Hazardous Area Two-wire/three-wire/four-wire transmitters, NAMUR-type proximity sensors (compliant with DIN19234 standard), passive switches, thermocouples (K, J, E, etc.), thermal resistances (Pt100, Cu50, etc.), RS-485/CAN communication equipment, frequency sensors, solenoid valves, alarms, valve positioners, electrical converters and other intrinsic safety equipment
Safe Area DCS (Distributed Control System), PLC (Programmable Logic Controller), industrial computers, display instruments, recorders, unit combination instruments and other control systems