Four channels for resistance temperature sensors
The UE20-4RTD measures four RTD inputs using two-, three- or four-wire sensor connections. It provides 16-bit resolution, temperature values in 0.1°C increments and eight bytes of process data. Magnetic isolation separates the internal bus from field inputs; channels are not isolated from each other.
Sensor selection and measuring limits
| Sensor type | Configured temperature range |
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| PT100 | -200°C to +800°C |
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| PT200 | -200°C to +630°C |
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| PT500 | -200°C to +630°C |
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| PT1000 | -50°C to +300°C |
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| Ni120 | -79°C to +309°C |
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The module has an overall measuring envelope of -200°C to +850°C. Use the configured sensor ranges above for temperature selection; the overall envelope does not extend a sensor type beyond its configured limit.
| Characteristic | UE20-4RTD |
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| Sensor category | RTD, resistance temperature detector |
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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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| Isolation | Magnetic isolation between internal bus and field inputs; no channel-to-channel 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 | Individual upper and lower limits for each channel |
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Supply and spring terminal wiring
| Characteristic | Specification |
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| Internal bus supply | 5V DC nominal; 4.75-5.25V DC |
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| Bus supply current | 190mA typical at 5V DC |
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| Station field circuit voltage | 24V DC, +20%/-15% |
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| Connection method | Spring terminal blocks |
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| Conductor cross-section | 0.2-1.5mm² |
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| AWG conductor range | AWG28-AWG16 |
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| Stripping length | 8-9mm |
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Mounting and application environment
| Characteristic | Specification |
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| Height × width × depth | 100mm × 12mm × 68mm |
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| Mounting | 35mm DIN rail |
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| Ingress protection | IP20 |
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| Operating temperature for application | -10°C to +55°C |
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| Storage temperature for application | -20°C to +60°C |
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| Operating relative humidity | 5-95%RH, non-condensing |
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| Storage relative humidity | Below 90%RH, non-condensing |
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