Vaisala FS11 - Electrical Specifications

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Table 36 FS11 Transmitter Optical Specifications
Property
Description / Value
Light source
Near infrared Light Emitting Diode
Peak wavelength
875 nm
Modulation frequency
2.2 kHz
Lens diameter
30 mm
Optical monitoring
Light source stability control
Optical path blockage measurement
Window contamination measurement and
compensation circuitry
Table 37 FS11 Receiver Optical Specifications
Property
Description / Value
Photodiode
PIN 6 DI
Spectral response
Max. responsivity 0.55 A/W at 850 nm (over 0.3
A/W in the range of 550...1050 nm)
Reception lens diameter
24 mm
Optical monitoring
Optical path blockage measurement
Window contamination measurement and
compensation circuitry
Photodiode DC saturation signal
Electrical Specifications
Table 38 FS11 Electrical Specifications
Property
Description / Value
AC (mains) power supply
100/115/230 VAC ±10%, 50-60 Hz
Power consumption
370 VA maximum (50 VA + 320 VA defrosting
heaters) with options
220 VA maximum (30 VA + 190 VA defrosting
heaters) without options
Battery backup option
Battery 2 Ah, typical backup time 30 min at 25 °C
and 5 min at -40 °C
Outputs
Serial data line RS-232 or opto-isolated RS-485
(2-wire) or optional data modem
Separate Maintenance line RS-232 +12 VDC
max 0.8 A output for option powering
Output data
Automatic or polled visibility and sensor status
data message with selectable message interval