Overview
The analog input isolated safety barrier with surge protection function provides isolated power supply for two - and three wire transmitters in hazardous areas. The 4-20mA signal generated by the transmitter or current source is transmitted from the hazardous area to the safe area output, thereby driving the load in the safe area. For two - or three wire transmitters or current source signals, this safety barrier supports bidirectional communication of the Hart digital signal superimposed on the 4-20mA signal and has a wire breakage alarm function.
This product requires independent power supply, with isolated power supply, input, and output terminals.
Specifications
| Input in harzadous area | |
| Input signal | Two or three-wire transmitter or current source(HART digital signal) |
| Transmitter distribution voltage | The open circuit voltage is ≤28V, and the output voltage is ≥15.5V when the circuit is 20mA. |
| Output in safe area | |
| Output signal | 4~20 mA(HART digital signal) |
| Output load | When outputting 20mA, 0~500 Ω (customizable) Optional voltage output type, load resistance RL ≥ 330k Ω |
| 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) |
| Basic parameters | |
| Supply voltage | 20~35VDC |
| Power consumption | When 24V power supply, 20mA output ≤65mA(PHD-11TD-21+) ≤95mA(PHD-12TD-211+) |
| LED indicator | Green: power indicator |
| Response time | 2ms to reach 90% of the final value |
| Temperature drift | 0.005% F.S/℃ |
| Temperature parameters | Working temperature: -20℃ ~ +60℃, Storage temperature: -40℃ ~ +80℃ |
| Relative humidity | 10%~95% RH no condensation |
| Insulation strength | Between intrinsically safe side and non-intrinsically safe side (≥3000VAC/min); between power supply and non-intrinsically safe side (≥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 ≥ 500W |
| Applicable field equipments | Two, three-wire (HART) transmitter or current source (HART) signal |
| 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 5-6、5-4 | Um:250V AC/DC Uo=28V DC lo=93mA Po=0.65W Co=0.083μF Lo=4.2mH |
| Terminal 4-6 | Um:250V AC/DC Uo=7.2V DC lo=--- Po=-Co=12μF Lo=-- |
| Certification body | CQST(China National Quality Supervision and Test Centre for Explosion Protected Electrical Products) Shanghai lightning protection products testing center |
Dimension
Connection wiring
Note:
1. PHD-11TD-21+ does not include output 2 part.
2. The power supply of the power rail is an optional function. Users need to specify the power supply mode when ordering. Please refer to attachment on page 89.