Description
The 56-RTR503B is TandD’s standard logger for combined temperature and humidity measurement with an external T/RH probe on cable — perfect when you need to measure at a specific point (wine bottle, pharmaceutical packaging, plant pot, warehouse shelf) while the logger unit with radio sits safely at a distance. The measuring range of 0–55 °C and 10–95 %RH covers most indoor environments.
The TR-3310 probe is included as standard. Measurement data is transmitted wirelessly via radio (EU: 869.7–870 MHz) to any RTR-500B base unit at a direct line-of-sight distance of up to 150 meters, or longer with a repeater. For higher precision and a wider measuring range, see the 56-RTR507B (with SHA-3151 high-precision probe).
Features
- External T/RH probe on cable (TR-3310 included)
- Temperature measuring range: 0 to +55 °C
- Humidity measuring range: 10 to 95 %RH
- Accuracy temperature: ±0.5 °C / Humidity: ±5 %RH (at 25 °C, 50 %RH)
- Resolution 0.1 °C / 1 %RH
- Wireless range approx. 150 meters line-of-sight
- 8,000 data point memory (one data point = both temperature + RH)
- 15 fixed logging intervals: 1–60 sec or 1–60 min
- Battery life approx. 10 months on LS14250
- Built-in LCD displays current values (alternating temp/RH) and battery warning
- Bluetooth 4.2 BLE for configuration via mobile app
Specification
| Measurement channels | Temperature 1 channel (thermistor) + Humidity 1 channel (polymer) — external, on cable |
|---|---|
| Measuring range | 0 to +55 °C / 10 to 95 %RH |
| Accuracy | ±0.5 °C / ±5 %RH (at 25 °C, 50 %RH) |
| Resolution | 0.1 °C / 1 %RH |
| Response time (90 %) | approx. 7 minutes |
| Logging capacity | 8,000 data points (combined temp + RH) |
| Logging mode | Endless or One Time |
| Wireless communication | EU: 869.7–870 MHz, RF power 5 mW, range approx. 150 m |
| Other interfaces | Bluetooth 4.2 BLE, optical communication |
| Protection class | IP64 on the logger unit (T/RH probe is not water-resistant) |
| Power supply | Lithium battery LS14250 × 1 (included) |
| Battery life | approx. 10 months |
| Dimensions | 62 × 47 × 19 mm (excl. protruding parts and probe) |
| Weight | approx. 50 g |
| Operating environment | -40 to +80 °C (during wireless transmission: -30 to +80 °C) |
| Compatible base units | 56-RTR500BC, 56-RTR500BW, 56-RTR500BM |
Included accessories
- 56-RTR503B logger
- External T/RH probe 56-TR-3310
- 1 × Lithium battery LS14250
- Strap for hanging
- Manual set with warranty certificate
Applications
The 56-RTR503B is selected for daily T/RH monitoring needs in indoor environments: food storage, wine cellars, greenhouses, museums and archives, pharmaceutical warehouses, classrooms, offices, and data centers where both temperature and humidity are critical. For higher accuracy (±2.5 %RH) and a wider measuring range (-25 to 70 °C), choose the 56-RTR507B. For a compact built-in probe without cable, see the 56-RTR32B (Bluetooth).
