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Sensor Unit
Operating Principle: Single pass transmissometer
Light Source: Modulated high-intensity LED @ 637 nm wavelength
Span: Fully selectable in % opacity, extinction, mg/m³ & mg/Nm³
Averaging: 4 rolling averages selectable from 10 seconds to 30 days
Accuracy: ±0.2% opacity
Drift: <1% opacity per month
Resolution: 0.1% opacity
Optical Path Length: 0.5 – 15 m
Air Purge: Compressed air, 1 litre/sec @ 1 bar
Ambient Temperature: -20°C to +70°C
Power Supply: 76 V to 265 V AC @ 50/60 Hz, 20 VA
Construction: Epoxy-coated aluminium, IP6 rated
Analogue Outputs: 2 x 4–20 mA current outputs, isolated, max load 500 Ω, fully configurable via keypad
Logic Outputs: 2 x volt-free SPCO contacts (50 V, 1 A max), configurable as alarm contacts; 1 x volt-free SPCO contact (50 V, 1 A max) for data valid
Digital Output: RS485 Modbus
Input: 4 x 4–20 mA inputs for normalization data (temperature, oxygen, pressure & water vapour)
Display: 32-character alphanumeric back-lit LCD
Keypad: 4-key soft-touch entry
