Four RTD measurement channels
The UF20-4RTD accepts four resistance temperature detector inputs and transfers eight bytes of process data. It supports two-, three- and four-wire sensor connections, magnetic isolation and individual upper/lower process alarms for each channel.
Temperature measurement and diagnostics
| Characteristic | UF20-4RTD |
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| Sensor category | RTD, resistance temperature detector |
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| Sensor types | PT100, PT200, PT500, PT1000 and Ni120 |
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| Channels | 4 |
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| Process data | 8 bytes |
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| Sensor wiring | Two-, three- or four-wire |
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| Resolution | 16 bits; 0.1°C per count |
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| Precision | ±0.3% |
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| Module measuring range | -200°C to +850°C |
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| Isolation method | Magnetic isolation |
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| Fault diagnostics | Supported |
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| Diagnostic conditions | Sensor disconnection and parameter assignment errors |
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| Process alarms | Upper and lower limits for each channel |
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The module measuring range is an overall limit; the usable temperature range also depends on the selected RTD type and sensor.
Power and terminal connections
| Characteristic | Specification |
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| Operating voltage | 24V DC, +20%/-15% |
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| System feed current | <100mA |
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| Connection method | Push-in terminal blocks |
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| Conductor cross-section | 0.34-1.5mm² |
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| Conductor size | AWG22-AWG16 |
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| Stripping length | 8-10mm |
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Installation and environment
| Characteristic | Specification |
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| Height × width × depth | 75mm × 12mm × 105mm |
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| Mounting | 35mm DIN rail |
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| Ingress protection | IP20 |
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| Operating temperature | -10°C to +55°C |
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| Storage temperature | -20°C to +85°C |
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| Relative humidity | 5-95%RH, non-condensing |
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