Measured values	Visibility (K-value), NO, NO2, NOx, CO, Temperature
Maximum number of measurands	5
Measurement principles	Differential optical absorption spectroscopy (DOAS), transmittance measurement, electrochemical cell, Resistance thermometer
Length of measuring path 10 m
Measuring ranges K-value 0 ... 15 km⁻¹ / 0 ... 200 km⁻¹ NO 0 ... 20 ppm / 0 ... 45 ppm NO2 0 ... 1 ppm / 0 ... 5 ppm CO 0 ... 100 ppm / 0 ... 300 ppm Temperature –25 ... +55 °C / –25 ... +75 °C
Response time (t90)	Visibility (K-value): 5 s ... 360 s Adjustable (45 s pre-configured) NO, NO2: 5 s ... 360 s Adjustable (45 s pre-configured) CO: ≤ 60 s
Linearity	NO: ± 0.48 ppm NO2: ± 0.035 ppm CO: ± 2 ppm < 60 ppm CO: ± 5 ppm 60 ppm < x < 150 ppm CO: ± 9 ppm 150 ppm < x < 300 ppm
Detection limit Visibility (K-value) 0.03 km⁻¹ NO 0.002 ppm NO2 0.007 ppm
Repeatability Visibility (K-value) 0.017 km⁻¹ NO 0.031 ppm NO2 0.007 ppm
Ambient temperature –20 °C ... +55 °C CO sensor –20 °C ... +55 °C
Storage temperature –25 °C ... +75 °C CO sensor 0 °C ... +20 °C
Ambient pressure 700 hPa ... 1,200 hPa
Ambient humidity 10 % ... 95 % Relative humidity; non-condensing
Conformities	ASTRA "Guideline - Ventilation of Road Tunnels" (2008) RABT 2006 RVS 09.02.22
Electrical safety	CE
Enclosure rating IP69K
Analog outputs	6 outputs: 0 ... 20 mA Depending on device version
Digital outputs	4 relay contacts: Depending on device version
Digital inputs	4 potential-free contacts
I/O extensions	Optical fiber connection optional
Ethernet ✔ Function Connection to SOPAS ET software or OPC server
Modbus ✔ Type of fieldbus integration TCP
CAN bus ✔ Function For connection of a SCU control unit
Operation	Via software SOPAS ET
Dimensions (W x H x D) Sender/receiver unit 718 mm x 470 mm x 310 mm (for details see dimensional drawings) Reflector unit 617 mm x 278 mm x 245 mm (for details see dimensional drawings) Connection unit 450 mm x 254 mm x 148 mm (for details see dimensional drawings)
Weight Sender/receiver unit 20 kg Reflector unit 9 kg Connection unit 8 kg
Material	Stainless steel 1.4571, powder-coated
Energy supply Voltage 115 V AC, ± 10 % 230 V AC, ± 10 % Frequency 50 Hz / 60 Hz Power consumption ≤ 200 VA
Test functions	Automatic check cycle for zero and span point Contamination check Manual linearity check
Options	CO sensor

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