Overview
The RTD input isolation safety barrier can convert the two wire or three wire thermistor (RTD) signals in hazardous areas into 4-20mA current signals and output them 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.
"*" represents the input type of the thermistor, and the specific model is represented by a code (see "Input Signal Type and Range Table" for details).
Input signal types and measurement range
| Code | RTD model | Measurement range | Minimum range | Conversion accuracy |
| 1 | G53 | -50~150℃ | 20℃ | 0.2℃/0.1% |
| 2 | Cu50 | -50~150℃ | 20℃ | 0.2℃/0.1% |
| 4 | Pt100 | -200~850℃ | 20℃ | 0.2℃/0.1% |
| 6 | Pt1000 | -200~850℃ | 20℃ | 0.2℃/0.1% |
| 7 | Ni1000 | -60~250℃ | 20℃ | 0.2℃/0.1% |
Example: Isolated safety barrier Pt100 input, temperature range 0~400℃, two outputs are with 4~20mA, the power supply is 20~35VDC. The model is PHD-22TZ-4141(0~400℃), the measurement range can be set to the specified range of 0~400℃ by computer.
* Bus terminal power supply, please see appendix for details.
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Specifications |
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Input in harzadous area |
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Input signal |
Two wire or three wire thermistor signals (see "Input Signal Type and Range Table" for details) |
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Input disconnection |
The default "low alarm" can be modified to "high alarm" through configuration software |
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Signal range |
Corresponding measurement range of thermal resistance |
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Measurement range |
Users make their own configuration when ordering, and indicate it at the tail number or otherwise. |
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Safety side output: |
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Output signal |
4~20mA |
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Output load capacity |
0~500Ω(customizable) |
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Supply Voltage |
20-35VDC |
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Power consumption |
≤ 90mA ( when 24VDC power supply, 20mA output) |
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LED indicator |
Green: Power indicator |
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Output accuracy |
Please refer to the "Input Signal Type and Range Table" for details |
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Response time |
Reaching 90% of the final value within 300ms |
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Temperature drift |
0.005%F.S/℃ |
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Temperature parameters |
Working temperature: -20℃~+60℃ |
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Relative humidity |
10%~95% RH no condensation |
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Dielectric strength |
Between intrinsically safe side and non-intrinsically safe side (≥ 3000VAC/min); |
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Insulation resistance |
≥100MΩ (between input/output/power supply) |
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Electromagnetic compatibility |
According to IEC 61326-1(GB/T 18268), IEC 61326-3-1 |
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MTBF |
100000h |
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Wire requirements |
Horizontal cutting surface ≥ 0.5mm2; Insulation strength ≥ 500V |
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Applicable field equipments |
Two wire or three wire thermistors |
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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 |
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Intrinsically safe certification |
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Functional safety certification |
SIL3 according to IEC 61508 standards |
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Explosion proof mark |
[Ex ia Ga]lIC [Ex ia Da]lllC |
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Explosion-proof standard |
GB/T3836.1-2021 GB/T3836.4-2021 |
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Terminals 1-3、2-3、4-6、5-6 |
Um:250V AC/DC Uo=8.4V DC lo=31mA |
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Certification body |
CQST(China National Quality Supervision and Test Centre for Explosion Protected Electrical Products) |
Schematic diagram
Note:
- 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"
- When inputting a three wire RTD, it is necessary to ensure that the three wires are of equal length as much as possible
- When inputting a two-wire RTD, safety barrier terminals 4 and 2 must be short circuited
Terminal assignments and dimensions
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Terminal |
Terminal assignments |
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14 |
Power supply+ |
20～35VDC |
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15 |
Power supply- |
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2-wire |
3-wire |
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4 |
Input 1+ |
Input 1+ |
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5 |
Input 1- |
Input 1- |
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6 |
with 5 short connected |
Input 1- |
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1 |
Input 2+ |
Input 2+ |
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2 |
Input 2- |
Input 2- |
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3 |
with 2 short connected |
Input 2- |
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8 |
Output 1+ |
4～20mA |
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9 |
Output 1- |
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11 |
Output 2+ |
4～20mA |
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12 |
Output 2- |
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