Surface Humidity Indicator LB-910
- functions: conductometer
- measurement: surface humidity, leaf humidity
- two cable connection
- measurement transmission to long distances
Indicator LB-910 is used for signaling the presence of precipitation or dew out dropping. It is a stationary device, of small size, powered from an outside power supply. It is characterized by a modern construction based on efficient and energy saving microprocessor controller.
The device takes cyclic measurements of the measured surface resistance, which is made in a form of a golden comb. The surface resistance decline indicates precipitation (or the appearance of dew). In order to designate the actual surface resistance value a microprocessor built-in in the device uses digital calibration data stored during the calibration process in the device's nonvolatile memory. The result is sent from the device in a digital form (digital current loop) to a supervisory system of data collection (i.e. using a transitory LB-371 through an interface RS-232C to a computer, meteorological station panelor to a converter ). The interface parameters allow on sending data along with powering the device using a two cable line of any polarity.
|Scope of measurement||0...65000 ohm|
|Accuracy||10 % (measured value) +/- 20 ohm|
|Scope of voltage||8..24 V DC|
|Energy consumption||4 mA||average|
- current loop , 300 bit/s, 7 data bits, 1 stop bit, without evenness control
- 80 x 60 x 185 mm (width x height x length)