Description
1. At-A-Glance Executive Brief
- Model: D5072D
- Brand: GM International (GMI)
- Part Type: Dual-Channel Resistance Repeater / RTD Isolator
- Lifecycle Status: Active Production / High Demand Spare
- System Compatibility: Hazardous Area Instrumentation / Safety Instrumented Systems (SIL 2)
- Weight: 135 g (4.8 oz)
2. Technical Introduction
Process measurement loops operating in hazardous zones often encounter ground loops, electrical noise, and signal degradation that threaten safety integrity. The GM International D5072D acts as a dual-channel intrinsically safe resistance repeater, engineered to interface 2-, 3-, or 4-wire RTD or potentiometer sensors located in Zone 0 with safe-area control systems. By providing three-port galvanic isolation across input, output, and power supply rails, this module suppresses common-mode interference and prevents fault propagation, ensuring precise and reliable temperature or position tracking without compromising explosion protection standards.
3. Core Technical Specifications
| Parameter | Value |
| Number of Channels | 2 Independent Channels |
| Nominal Supply Voltage | 24 VDC (18 to 30 VDC), reverse polarity protected |
| Current Consumption | Typical 37 mA @ 24 VDC (1 mA excitation current) |
| Input Signal Types | 2-, 3-, 4-wire RTD, Resistance, or Potentiometer (0 to 4 k\Omega) |
| Output Signal | Isolated Resistance / Repeater Output (0 to 400 \Omega) |
| Safety Integrity Level | SIL 2 / SC 3 in accordance with IEC 61508 |
| Galvanic Isolation | Three-Port Isolation (Input / Output / Supply) up to 2.5 kV |
| Operating Temperature | -40°C to +70°C (-40°F to +158°F) |
4. Field Engineer’s Tech Notes
- RTD Lead Wire Compensation: When wiring 3-wire or 4-wire RTDs to the hazardous-side terminals, ensure all lead resistances are balanced correctly during configuration. Unbalanced line resistance will introduce calibration drift into the resistance-repeated output loop.
- Bus-Powered Configuration: If utilizing the optional DIN-rail power bus connector for multiple D5000 modules, verify that the total current draw on the power feed does not exceed the fuse rating of your power distribution block.
5. Adaptive QA & Testing Protocol
Every D5072D unit undergoes strict functional validation on our specialized hazardous-area simulation test bench before dispatch.
- Testing Actions: Technicians supply nominal 24 VDC power and connect precision decade resistance boxes to the input channels to simulate 3-wire RTD curves across various temperature spans. We verify signal isolation integrity, measure output tracking accuracy against standard resistance curves, and test fault-detection response times (such as open-circuit burnout simulation) to confirm proper high-range error forcing.
- Documentation: Detailed functional test verification reports and calibration logs are available upon request prior to shipment to ensure absolute out-of-box reliability.
6. Buyer’s FAQ
- What is the difference between the D5072S and the D5072D models?The “S” designation denotes a single-channel variant, whereas the D5072D features dual independent channels in a compact 12.5 mm housing, maximizing cabinet packing density.
- What warranty coverage comes with this safety isolator?All units are backed by a comprehensive 12-month operational warranty covering hardware integrity and loop-isolation performance.
- How fast can an emergency replacement unit be delivered?In-stock parts ship same-day from our US warehouse via expedited global freight to reduce unplanned downtime during site turnarounds.
- Is programming software required to set up this module?Operating parameters can be configured via DIP switches or software depending on the exact revision, but standard out-of-the-box configurations match typical industrial RTD mapping profiles.
