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The meteorological field equipment
PMK
was used
at temporary airfields to find out weather data, among other things. The data can be read, but not stored.
The whole station is packed in a waterresistant metal box. The mechanism in the box is fastened by springs, so it can
be handled roughly. A sectional mast carries:
Anemometer (Wind velocity); also reading the wind direction.
A sensor for temperature and humidity.
The built-in barometer is usually used in aeroplanes to measure the altitude; a BD-10.
A normal barometer's pointer turns roughly 360° and reads 700 to 790 mB, the pointer of the
barometer used here turns three times, reading from 560 to 800 mB.
Temperature, wind direction, wind velocity and humidity are selected by a switch, and shown while pressing a pushbutton. At 1.3 A power
consumption , while measuring, this momentary measuring is quite advisable.
The instrument is turned by a motor and shows the last reading when the pushbutton is released.
The meteorological set is fully solid state,
The metal box contains:
a lockable mast (so the direction North stays fixed)
a mast base
three nails for
two three- sided ropes
the anemometer in three parts
the sensor temperature / humidity; and a cover for it
an optical device (not mentioned in the TM)
the reading
accessories, among other things a compass.
Readings:
- Wind velocity:
- in m / s
- Range 1.5 .. 40 m/s
- Possible error +- 0.5 m/s
- Wind direction:
- in degrees ( 0 - 360° )
- Possible error 10 %
- Temperature:
- in ° Celsius
- Range -55 .. +45 °C
- Possible error +- 0.8 °C
- Humidity:
- in %
- Range 30 .. 100 %
- Possible error +- 7 %
- Air pressure:
- in Millibar ( 560 - 800 mB )
- Possible error 1.8 .. 5.4 %
- Voltage:
- Range 0 .. 7.5 V
- Allowed voltage 6V +20% / -10%
- Weight
- 23 kgs
- Height of mast:
- 4 m
- Batteries used:
- Silver- Zinc- Batteries
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R-407
NFM 1