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Surge Protection Type RTD input isolated safety barrier

1 input 2 outputs

Input :Two-wire or three-wire RTD Pt100 signal

Output :RTD  Pt100 signal


    The thermistor input isolation safety barrier with surge protection function can convert the Pt100 signals of two wire and three wire thermistors (RTDs) in hazardous areas into a 1:1 signal of the thermistor and transmit it to the safety zone. It can be intelligently configured, and the actual range of the thermal resistance can be set through computer software. It has the functions of wire breakage alarm and out of range alarm.

    This product requires independent power supply, with isolated power supply, input, and output terminals.


    Input in harzadous area
    Input signal Two wire or three wire Pt100 signal
    Measurement range -200℃-850℃
    Safety side output:
    Output signal RTD Pt100 signal
    Load capacity Load capacity 0-500 Ω (customizable)
    Surge protection features:
    Nominal discharge current ln(8/20μs) 5kA
    Voltage protection level Up(8/20μs): 60V(line to line)
    Voltage protection level Up(8/20μs): 600V(line to ground)
    According to standards GB/T18802.21-2016(equivalent to 1EC61643-21:2012)
    Supply voltage 20-35VDC
    Power consumption ≤55mA (when 24VDC power supply) 
    LED indicator  Green: Power indicator
    Short circuit alarm: ALM red light stays on for a long time
    Open circuit alarm: ALM red light flashing
    Output accuracy 0.1%F.S
    Temperature drift 0.1%F.S/10℃
    Temperature parameters Working temperature: -20℃~+60℃, storage temperature:-40℃~+80℃
    Relative humidity 10%~95% RH no condensation
    Dielectric strength Between intrinsically safe side and non-intrinsically safe side (≥ 3000VAC/min);
    between power supply and non-intrinsically safe terminal (≥ 1500VAC/min)
    Insulation resistance ≥100MΩ (between input/output/power supply)
    Electromagnetic compatibility According to IEC 61326-1(GB/T 18268), IEC 61326-3-1
    MTBF 100000h
    Wire requirements Horizontal cutting surface ≥ 0.5mm2; Insulation strength ≥ 500V
    Applicable field equipments Two wire or three wire RTD Pt100
    Installation place Installed in a safe zone, it can be connected to intrinsic safety instruments in hazardous areas up to Zone 0, IIC, Zone 20, and IIIC
    Intrinsically safe certification
    Explosion proof mark [Ex ia Ga]lIC [Ex ia Da]lllC
    Explosion-proof standard GB/T3836.1-2021  GB/T3836.4-2021
    Terminals 4-6、5-6 Um:250V AC/DC Uo=8.4V DC lo=31mA
    Po=65.1mW Co=4.8μF Lo=20mH
    Certification body CQST(China National Quality Supervision and Test Centre for Explosion Protected Electrical Products)




    Schematic Drawings



    1. The power rail function is an optional function, and users need to specify the power supply method when placing an order

    The selection of power rail connectors can refer to page 89 of the "Annex"

    2. When inputting a three wire RTD, it is necessary to ensure that the three wires are of equal length as much as possible

    3. When inputting a two-wire RTD, safety barrier terminals 5 and 6 must be short circuited