UR air relative humidity sensor
- Manufacturer: Nesa
- Category: Meteorology – Climatology, SENSORS, Humidity Sensors, Temperature - Humidity
The NESA UR is a relative humidity sensor with a thin-film capacitive transducer, measuring range of 0 ÷ 100 %Rh, resolution less than 0.1% and anti-radiation shelter compliant with WMO and EN 15518-3:2011.
The capacitive variation of the sensing element is converted into a standardized signal in voltage 0–1Vdc (UR-A, URV-A), current 4–20mA (UR-B, URV-B), or RS485/ModBus RTU digital bus (UR-C, URV-C). It is manufactured in an anodized or painted aluminum alloy body (IP68 connector), in versions with natural ventilation (code UR) or forced ventilation (code URV).
Key points
- Thin-film capacitive transducer with a range of 0 ÷ 100 %Rh and a resolution of less than 0.1%
- Accuracy of ±1% @ 23°C and response time less than 8 s (10÷80%RH)
- Anti-radiation screen with natural ventilation (UR) or forced ventilation (URV) in accordance with WMO and EN 15518-3:2011
- Available outputs: 0÷1Vdc (A), 4÷20mA (B) and RS485 / ModBus RTU (C)
- Anodized or painted aluminum alloy body with stainless steel screws and IP68 7-pin connector
Technical Frequently Asked Questions
What output signals does the UR relative humidity sensor deliver?
It is available in three output versions: A (0÷1Vdc voltage proportional to 0÷100 %Rh), B (4÷20mA non-self-powered current) and C (RS485 Half duplex digital interface with ASCII xxxCR request or ModBus RTU function 0x03 in registers 40002 – 40003 in IEEE754 32-bit format at 9600 baud, 8N1).
How do I order the UR relative humidity sensor?
The order code combines the sensor (UR with natural ventilation or URV with forced ventilation), the outlet (A, B, or C), the sensor-datalogger cable (05 = CS05 of 5 m, 10 = CS10 of 10 m, xx* = CSxx, length in meters to be specified in the order), and the SSU sensor bracket with a length of L = 700-750 mm. Manufacturer example: UR C 10 SSU. The model references are UR-A, UR-B, UR-C, URV-A, URV-B, and URV-C.
Under what environmental conditions does the UR sensor operate?
It operates in conditions of -50 ÷ +80 °C, with electrical protection against reverse polarity and transients, IP68 connector and wind resistance up to 50 m/s (60 m/s gusts).
Properties
| Feature | Specification |
|---|---|
| Measurement and sensitive element | |
| Measured magnitude | Relative humidity of the air |
| Typical measurement range | 0 ÷ 100 %Rh |
| Transducer type | Thin-film capacitive |
| Precision | ±1% @ 23°C |
| Resolution | < 0.1% |
| Sensitivity | 0,5 % |
| Linearity | 1.5% in the interval 20…90% |
| Repeatability | 0,1 % |
| Response time | < 8 s (10÷80 %RH); time constant in air < 12 s (63% of the variation in the sampling interval) |
| Ventilation | Natural (URV code) or forced (URV code) |
| Regulatory compliance | WMO · EN 15518-3:2011 · CE |
| Output signals and interface | |
| Voltage output (version A) | 0÷1Vdc (0÷100 %Rh; %Rh = V · 100) |
| Current output (version B) | 4÷20mA not self-powered (%Rh = (100 · (mA – 4)) / 16) |
| Digital output (version C) | RS485 Half duplex (ASCII request xxxCR) or RS485 / Modbus RTU (function 0x03, registers 40002 – 40003 IEEE754 32 bits), via MCS interface; Standard ID 002 |
| RS485 communication parameters | 9600 baud, N parity, 8 data bits, 1 stop bit |
| Output impedance | 60÷200 Ω |
| Standard ID (version C) | 002 |
| Calibration | By comparison with a reference sensor certified by Accredia; comes with a calibration report |
| Power supply, environment, and mechanical data | |
| Feeding | 10÷30Vdc |
| Consumption | Typical < 0.1 W · Maximum 2 W @ 12Vdc (TAV mod., forced ventilation) |
| Electrical protections | Against polarity reversal and transients |
| Operating conditions | -50 to +80 °C; wind 50 m/s (gusts of 60 m/s) |
| Connector protection rating | 7-pin IP68 connector |
| Construction material | Anodized or painted aluminum alloy, stainless steel screws |
| Dimensions | Ø 162 mm; height 220 mm |
| Weight | 680 g |
| Reference | Configuration |
|---|---|
| UR-AURA | Model: UR · Ventilation: Natural · Output signal: 0÷1Vdc (0 ÷ 100 %Rh) |
| UR-BURB | Model: UR · Ventilation: Natural · Output signal: 4÷20mA (0 ÷ 100 %Rh) |
| UR-CURC | Model: UR · Ventilation: Natural · Output signal: RS485 / ModBus RTU |
| URV-AURVA | Model: URV · Ventilation: Forced · Output signal: 0÷1Vdc (0 ÷ 100 %Rh) |
| URV-BURVB | Model: URV · Ventilation: Forced · Output signal: 4÷20mA (0 ÷ 100 %Rh) |
| URV-CURVC | Model: URV · Ventilation: Forced · Output signal: RS485 / ModBus RTU |
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