NESA PWS Present Weather Sensor



Product Introduction
Product Features
Technical Details
Product Introduction

Biral visibility and present weather sensorVisibility range: 10m ÷ 50km (selectable full scale 2km, 10km, 20km, 32km or 50km), recognizing the type and amount of precipitation (presence of fog, haze, smoke, sand, drizzle, rain, snow and precipitation). This sensor has features of disdrometer and visibility measuring in a compact solution. Infrared measuring principle with distinction of phenomena according to WMO regulations reference table 4680 and 9328 ICAO standard. Out standard: RS485 (with heater option available and analogical output). This sensor is suitable for applications in various fields of environmental monitoring, and is particularly suitable for the AWOS weather stations in the aeronautical field. Easy to install, requires no periodic calibration and is protected from overvoltage and corrosive agents. The sensor is designed for mounting on pole by two collars adjustable (included).

  • According to WMO and ICAO standards
  • Accurated and reliable visibilità&present weather sensor
  • Infrared measuring system
  • Compact and light design in aluminium
  • Especially suitable for AWOS applications
  • Available with heating system in different levels

Product Features

  • Biral present weather sensor according to WMO
  • Ideal for use on roads and airports
  • Compact and lightweight aluminum IP65 structure for outdoor use.
  • Measures according to the reference table 4680 and ICAO standard 9328
  • Recognition type and amount of precipitation
  • Low power consumption: <3W @ 24Vdc (available with heating)
  • Output signal: RS485
  • Operating conditions: -40 to + 60 ° C
  • Power supply: 10 to 35Vdc

Technical Details

Typical range

VIS : 10 ÷ 50.000mt; Type of phenomena: presence of fog, haze, smoke, sand, drizzle, rain, snow and precipitation up to 250 mm/h


VIS: 10mt; rain: 0.015 mm/h snow: 0.0015 mm/h

Average Accuracy

VIS ± 10%, pioggia-neve /rain-snow: <15%

Response time

<10 s

Type of transduce


Standard output signal

RS485 (baud rate 10÷300 selectable)

Working conditions

-40°c ÷ +60°C


polarity reverse and transient

Made of

Aluminum alloy, stainless steel screws

Heater power supply

Max 50W@12Vdc (mod. PL400R)


Polarity reverse and transient, debounce circuit

Output resistance

100 mW / 1MW

Made of

Aluminum alloy, stainless steel bucket

Power supply and consumption

10÷35Vdc, max 55W with heaters


3.3 Kg


Standard cable


Shielded multi-core cable for indoor/outdoor use, suitable for hot and cold climates.

With IP68 waterproof connector for connecting the sensor, and PS2 plug connector for direct connection to the data logger or with terminal sleeves for insertion into the terminal blocks.

Our cables are standard for most our sensors.

Available in different lengths starting from 1m.

Special Cable

NPI shielded cable. With IP68 waterproof connector for connecting to the sensor, and terminal sleeves for insertion into the terminal blocks.

Available in any length.

Bracket / Arm Support

Fixing system for Nesa’s sensors, composed by an arm of different lengths (50cm, 90cm, 150cm) and thermoplastic resin clam for external, able to withstand to extreme temperature and to solar radiation.

Two stainless steel screws for the tightening of the clamp on the sensor complete the equipment.

MCS Signal Conditioning Module

Single channel module for conditioning digital and analog electrical signals. Fully programmable for binding input/output with the USB interface available as an option.

·       Programmable input signals: Pt100, thermopiles, Voltages up to 2Vdc, Current 0÷20mA or 4÷20mA, frequency up to 1000Hz, Counter for pulses (1ms min)

·       Programmable Output signals: voltage 0÷2Vdc; Current 0÷20mA or 4÷20mA Serial RS485 (command line); Modbus RS485

·       Resolution: 18 bits with over 262,000 points

·       Operating conditions: -40 ÷ +80°C

·       DIN rail mounting

·       Power supply: 10÷30Vdc (typ. 4mA@12 Vdc)