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Measurement Performance
| Transmittance measurement resolution | 20 bit |
| Recommended Baseline Lengths | |
| 30 m (98 ft) baseline length (optimal) | MOR: 10 … 10 000 m (33 … 32 808 ft) Transmittance range: < 0.01 % … 100 % |
| 75 m (246 ft) baseline length | MOR: 37.5 … 10 000 m (123 … 32 808 ft) Transmittance range: < 0.02 % … 100 % |
| Purchased Option | |
| 25 m (82 ft) baseline length | 1/3 × baseline length to 10 000 m (32 808 ft) |
| Accuracy (RVR range) | Exceeds the ICAO (Annex 3) recommendations |
| Output data | Automatic or polled data messages Standard message including MOR, LT31 status and BGL data (option) Message including present weather data (option)
MITRAS transmissometer compatible message SKOPOGRAPH II Flamingo transmissometer compatible message FD12 Visibility Meter compatible message |
| Present weather reporting option | Identifies 7 different types of precipitation (rain, freezing rain, drizzle, freezing drizzle, mixed rain/ snow, snow, ice pellets) |
| Reports | 49 different codes from WMO 4680 code table |
Transmitter Optical Specifications
| Light source | White light-emitting diode (LED) – Certified class 1 product according to EN 60 825-1 |
| Optical monitoring | Light source stability control
Window contamination measurement and compensation circuitry |
Operating Environment
| Operating temperature | -40 … +60 °C (-40 … +140 °F) standard
-55 … +60 °C (-67 … +140 °F) hood heater option |
| Operating humidity | 0 … 100 %RH |
| Wind speed | Up to 60 m/s (134 mph) |
| Electrical safety | IEC 60950-22 / EN 60950-22/A11 /
IEC 60950-1 / EN 60950-1 / UL 60950-1 |
Inputs and Outputs
| AC supply | 100/115/230 VAC + 10 %, 50 … 60 Hz |
| Power consumption | Max. 800 VA (for complete LT31 system) with all options |
| Battery backup option | Battery 2 Ah, backup time 60 min at +20 °C (+68 °F) when a proper and fully charged battery is used |
| Obstruction light | Optional |
| Outputs | Serial data line RS-232 or optoisolated RS-485 (2-wire) or optional data modem Separate maintenance line RS-232 |
Mechanical Specifications
| Dimensions (H × W × D) | 2685 × 420 × 1022 mm (105.71 × 16.54 × 40.24 in) |
| Weight | |
| Transmitter Unit LTT111 | 85 kg (187.39 lb) |
| Receiver Unit LTR111 | 82 kg (180.78 lb) |
| IP rating | IP66 |
Compliance
| Radiated emissions | CISPR 22 / EN 55022 |
| Conducted emissions AC | CISPR 22 / EN 55022 |
| Harmonics current emissions | IEC 61000-3-2 / EN 61000-3-2 |
| Electrostatic discharge | IEC 61000-4-2 / EN 61000-4-2 |
| RF field immunity | IEC 61000-4-3 / EN 61000-4-311 V/m (80 MHz–1 GHz) 4 V/m (1 GHz–4 GHz) |
| Electric fast transient | IEC 61000-4-4 / EN 61000-4-4 |
| Surge | IEC 61000-4-5 / EN 61000-4-5 |
| Conducted RF immunity | IEC 61000-4-6 / EN 61000-4-6 |
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