Overview
Thermocouple input isolation safety barrier can isolate and convert thermocouple (TC) signals in hazardous areas into 4-20mA current signals, and output them to the safety zone. This safety barrier has built-in cold end compensation and can be intelligently configured. The actual range of the thermocouple can be set through computer software. It has the functions of wire breakage alarm and out of range alarm.It has the functions of disconnection 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 thermocouple, 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 |
TC model |
Measurement range |
Minimum range |
Conversion accuracy |
|
1 |
K |
-200~1370℃ |
50℃ |
0.5℃/0.1% |
|
2 |
S |
-50~1760℃ |
500℃ |
1.5℃/0.1% |
|
3 |
E |
-140~1000℃ |
50℃ |
0.5℃/0.1% |
|
4 |
J |
-160~1200℃ |
50℃ |
0.5℃/0.1% |
|
5 |
B |
250~1800℃ |
500℃ |
1.5℃/0.1% |
|
6 |
T |
-200~400℃ |
50℃ |
0.5℃/0.1% |
|
7 |
R |
-50~1760℃ |
500℃ |
1.5℃/0.1% |
|
8 |
N |
-200~1300℃ |
50℃ |
0.5℃/0.1% |
Example: when the input are 2 inputs with K-couple, temperature range is 0~1200℃, 2 outputs 4~20mA, power supply 20~35VDC, then the model should be PHD-22TT-1111 (0~1200℃).
The measuring range can be set to the specified 0~1200℃ range by computer.
* Bus terminal power supply, please see appendix for details.
Specification
|
Input in harzadous area |
|
|
Input signal |
K, S, E, J, B, T, R, N thermocouple signals (see "Input Signal Type and Range Table" for details) |
|
Input disconnection |
The default "low alarm" can be modified to "high alarm" through configuration software |
|
Signal range |
The measuring range of the corresponding thermocouple is -10~100mV. |
|
Measurement range |
Users make their own configuration when ordering, and indicate it at the tail number or otherwise. |
|
Built-in cold compensation |
±1°C(Compensation range -20°C~ +60°C) |
|
Safety side output: |
|
|
Output signal |
4~20mA |
|
Output load capacity |
0~500Ω(customizable) |
|
LED indicator |
Green: Power indicator |
|
Output accuracy |
Please refer to the "Input Signal Type and Range Table" for details |
|
Response time |
Reaching 90% of the final value within 500ms |
|
Temperature drift |
0.005%F.S/℃ |
|
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); |
|
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 |
K. S, E, J, B, T, R, N TC sensors |
|
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 |
|
|
Functional safety certification |
SIL3 according to IEC 61508 standards |
|
Explosion proof mark |
[Ex ia Ga]lIC [Ex ia Da]lllC |
|
Explosion-proof standard |
GB/T3836.1-2021 GB/T3836.4-2021 |
|
Terminals 3-2、4-2 |
Um:250V AC/DC Uo=8.4V DC lo=31mA |
|
Certification body |
CQST(China National Quality Supervision and Test Centre for Explosion Protected Electrical Products) |
Schematic diagram
Note:
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"
Terminal assignments and dimensions
|
Terminal |
Terminal assignments |
||
|
9 |
Power supply + |
20～35VDC |
|
|
10 |
Power supply - |
||
|
3 |
Input 1+ |
TC |
|
|
4 |
Input 1- |
||
|
1 |
Input 2+ |
TC |
|
|
2 |
Input 2- |
||
|
|
5 |
Output 1+ |
4～20mA |
|
6 |
Output 1- |
||
|
7 |
Output 2+ |
4～20mA |
|
|
8 |
Output 2- |
||
