NS31 Switch Input Isolator (Relay Output)
Input dry contact or NAMUR proximity switch, relay contact output; one-in one-out NS31, one-in two-out NS31-C, two-in two-out NS31-D.
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Switch input isolator, input dry contact or NAMUR proximity switch signal, output via isolated relay. DIP switches allow independent setting of output and input in-phase or reverse-phase logic control (default in-phase), and enable or disable line fault monitoring (default enabled, LED flashes on line fault). Requires independent power supply, three-port isolation between input, output and power supply.
| Parameter Name | Technical Specifications |
|---|---|
| Power supply and power consumption | |
| Power Supply | 18V DC～32V DC, power reverse protection |
| Power consumption | ≤1W |
| Input characteristics | |
| Input Signal | Dry contact or NAMUR proximity switch |
| Switching characteristics | Input current >2.1mA relay closed; <1.2mA relay open |
| Open-circuit voltage | Approx. 8.5V |
| Short-circuit current | Approx. 8.5mA |
| Line fault | ≤80µA indicates wire break; ≥6mA indicates short circuit, output relay opens |
| Output and load | |
| Output Signal | Relay contacts |
| Permissible load | 250V AC/2A or 30V DC/2A |
| Switch life | >100,000 operations |
| Switching frequency | <10Hz |
| Accuracy and response | |
| Response time | <20ms |
| Isolation and Environment | |
| Electromagnetic compatibility | IEC 61326-3-1 |
| Dielectric strength | ≥1500V AC (between input/output/power supply) |
| Insulation resistance | ≥100MΩ (between input/output/power supply) |
| Operating Temperature | -20°C～+60°C |
| Storage Temperature | -40°C～+80°C |
- Dry contact/NAMUR input, relay contact output
- DIP switch setting of in-phase/reverse-phase logic and line fault monitoring
- DIN-rail mounting, three-way isolation of input, output and power supply, dielectric strength ≥1500V AC, EMC IEC 61326-3-1.
Dry contact/NAMUR signal isolated to DCS
Proximity switch signal isolated and converted to relay output to DCS switch input channel, normally open contact also serves as fault alarm output
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