- Terminal Board
- Isolated Safety Barriers
- Signal Isolators
- Surge Protective Devices
- Safety Relays
- Isolated Intelligent I/O Modules
- Intelligent Gateways
- Industrial Data Optical Transceivers
- Online Dew Point Analyzers
- Data Acquisition Modules
- HART data converter
PHD-11TF-28
Overview
The isolated safety barrier with switch input transistor output, which isolates and transmits input signals from switch contacts or proximity switches in hazardous areas to of the safety zone with output transistor through the safety barrier. Line fault detection is achieved through LED on the top of the module. The dial switch of the module is used to set input and output in-phase or reverse control, as well as to enable or disable the line fault detection alarm indication function.
* bus terminal power supply, please see appendix for details.
| Specifications | |
| Input in harzadous area | |
| Input signal | Switch contacts/proximity switches |
| The supply voltage of the sensor | About 8V |
| Switching rate | <5kHz |
| Input/output characteristics: | |
| On site input current | >2.1mA, the output is closed, indicating ON; |
| When<1.2mA, the output is open circuit, indicating OFF | |
| Switched control between inverted phase and normal phase of outputs e-c | When the dial switch K1 is at "ON", the transistor output e-c are in inverted phase |
| When the dial switch K1 is at "OFF", the transistor output e-c are in normal phase | |
| When the K2 is at "ON", the circut will select the red light LFD indication alarm function | |
| Output in safe area | |
| Output signal | Relay and alarm relay (optional) |
| Output characteristic | NPN type transistor emitter or collector open circuit output |
| Drive capability | Output current ≤ 20mA (1.2k Ω), maximum internal current 100mA, equipped with short-circuit current protection |
| Basic parameters | |
| Supply voltage | 20~35VDC |
| Power consumption | <30mA(24V power supply, when the transistor is conducting) |
| LED indicator | Green: Power indicator |
| Yellow: Output transistor in normal working state | |
| Red: LFD indication, line fault alarm | |
| 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 | Cross-section ≥ 0.5mm²; Insulation strength ≥ 500V |
| Applicable field equipments | Field equipment such as dry contacts or NAMUR type proximity switch inputs that comply with DIN19234 standard |
| 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 3-4 | Um:250V AC/DC Uo=10.5V DC lo=15mA |
| Po=39.4mW Co=1.7μF Lo=165mH | |
| Certification body | CQST(China National Quality Supervision and Test Centre for Explosion Protected Electrical Products) |
Line Fault Detection（LFD）
Users can select the "ON" side of the switch at the top of the module to enable fault detection function and indicate an alarm through the red LED light. On site input current>7mA, short circuit alarm (SC);
On site input current<0.1mA, open circuit alarm (LB). If the switch contact input requires fault detection function (wire breakage, short circuit), a 22k Ω resistor should be connected in parallel at both ends of the switch, and a 680 Ω resistor should be connected in series (as shown in the wiring diagram for switch contact II).
