Processing digital signals from hazardous areas requires robust galvanic isolation, which the Weidmuller 8965360000 ACT20X-HDI-SDO-S delivers as a high-performance, 2-channel isolating switch amplifier. This device safely transmits switching states from NAMUR sensors or mechanical contacts located in Zone 0, 1, or 2 hazardous areas to the safe area control system, providing complete electrical separation and signal conditioning in a compact form factor.
Key Features
- Dual-channel intrinsically safe input for NAMUR sensors or dry mechanical contacts.
- Galvanic 4-way isolation between input, output, power supply, and status output.
- Integrated line fault detection (LFD) for continuous wire-break and short-circuit monitoring.
- FDT/DTM software-configurable parameters for custom application tuning and diagnostics.
- Relay outputs (1 changeover contact per channel) for robust load switching.
- Compact 22.5 mm DIN-rail housing to optimize cabinet space.
Applications
- Intrinsically safe signal isolation in chemical and petrochemical processing plants.
- Oil and gas pipeline monitoring systems requiring Zone 0/1 sensor deployment.
- Water and wastewater treatment facility telemetry and pump control.
- Hazardous area valve position feedback and limit switch integration.
Technical Specifications
| Parameter |
Value |
| Manufacturer |
Weidmuller |
| Article Number |
8965360000 |
| Model |
ACT20X-HDI-SDO-S |
| Number of Channels |
2 |
| Input Type |
NAMUR sensor (DIN EN 60947-5-6) or mechanical switch |
| Output Type |
Relay (1 changeover contact per channel) |
| Nominal Switching Voltage |
250 V AC / 30 V DC |
| Supply Voltage |
19.2 to 31.2 V DC |
| Power Consumption |
<= 1.1 W |
| Isolation Voltage |
2.6 kV AC (input / output / power) |
| Connection Technology |
Screw connection |
| Clamping Range |
0.5 to 2.5 mm2 |
| Flammability Rating |
UL 94 V-0 |
| Protection Degree |
IP20 |
| Operating Temperature |
-20 to +60 degC |
| Dimensions (H x W x D) |
117.2 mm x 22.5 mm x 113.6 mm |
| Net Weight |
0.170 kg |
Connections and Interfaces
| Terminal Pin |
Function / Circuit Assignment |
| 11 / 12 |
Channel 1 Input (NAMUR Sensor / Mechanical Switch) |
| 21 / 22 |
Channel 2 Input (NAMUR Sensor / Mechanical Switch) |
| 51 / 52 / 53 |
Channel 1 Relay Output (NC / COM / NO) |
| 61 / 62 / 63 |
Channel 2 Relay Output (NC / COM / NO) |
| 91 / 92 |
Power Supply (19.2 to 31.2 V DC: + / -) |
Alternative Models & Compatibility
The ACT20X-HDI-SDO-S is part of Weidmuller's premium ACT20X signal converter family. It serves as a direct replacement or upgrade path for legacy ACT20 series modules. When migrating from older systems, verify that your configuration files are updated in the FDT/DTM frame to match the specific firmware revision of the 8965360000 module.
Application Pitfalls & Engineering Notes
When utilizing standard mechanical switches instead of NAMUR sensors, the Line Fault Detection (LFD) circuit must be configured correctly. If LFD is enabled without external resistors, the module will interpret an open switch as a wire break and a closed switch as a short circuit. To prevent false diagnostics, either disable LFD via the DTM software or wire a resistor network (typically 1k Ohm in series and 10k Ohm in parallel) directly at the switch contacts.
Commissioning & Wiring Tips
Configuration is performed using the Weidmuller WI-Manager software via the front-panel service jack. Ensure the CBX200 USB interface cable is used for connection. For field wiring, maintain a minimum physical separation of 50 mm between the intrinsically safe (Ex i) blue terminals on the left side and the non-intrinsically safe terminals on the right side to comply with international hazardous area installation standards.
Installation Guidelines
CRITICAL WARNING
De-energize all power sources before mounting, wiring, or configuring the device. Failure to isolate power can result in electrical shock or spark generation in hazardous areas, compromising explosion protection safety.
1
Snap the module vertically onto a standard TS 35 DIN rail, ensuring the metal grounding spring on the back makes secure contact with the rail.
2
Connect the intrinsically safe field sensors to the blue terminals (11/12 and 21/22), ensuring proper cable routing away from power lines.
3
Wire the relay outputs and the 24 V DC power supply to the black terminals on the opposite side of the module.
4
Connect the configuration interface to set the desired input/output logic and LFD parameters using the FDT/DTM software before commissioning.