Ex Area Visibility/Fog Detector


Measures atmospheric visibility (meteorological optical range) by determining the amount of light scattered by particles (smoke, dust, haze, fog, rain, & snow) in the air that passes through the sample volume. A 42° forward scatter angle is used to ensure performance over a wide range of particle sizes. MOR is calculated by the user by converting the received signal strength (extinction coefficient, σ) using Koschmeider’s formula, MOR (Km) = 3/σ.

Performance in all weather conditions was a design prerequisite for this Fog Detector. The sensor uses ATEX rated EEx housings and offshore marine grade sheathed cables to ensure all weather, Zone 1, IP66 certified performance. A sturdy aluminum frame painted with durable powder-coat paint is used to mount the housings and provide mounting to a customer supplied mounting pipe. Power and signal lines are protected with surge and EMI filtering to help guarantee uninterrupted service for the life of the sensor.


Technical Details

Model Ex Area Visibility/Fog Detector
RX-TX heads GUB-type aluminium enclosures
Electronis Housing EJB-type aluminium enclosure
Measurement range 15 to 8,000 m
Accuracy ± 10 RMSE
Scatter Angle 42° nominal
Source 880 NM LED
IP Rating IP66
Ambient temperature -40 °C up to +60 °C
Temperature Humidity 0 up to 100 % RH
Voltage range 12 Vdc, 24 Vdc or 230 Vdc
Systempower 10 V A
Mounting Supplied ready to mount onto 122 mm OD and 5 mm wall thickness pipe
Weight 40 kg
Dimensions 1,170x915x760 mm WxHxD (excluding pole)

Certificate Details

Model Ex Area Visibility/Fog Detector
ATEX classification ATEX Ex II 2GD EEx d IIB T5/T6
Certificate (ATEX) CESI ATEX 036 & CESI ATEX 027


Model Ex Area Visibility/Fog Detector
Heating Hood mounted heaters for low “icing” temperature areas (Safe Area only)
Kits Calibration Kit

Order Details

Article Code Dimensions Weight
602.001 1,170x915x760 mm 40 kg