THERMOMETER – HYGROMETER LB-710R
for meteorological cage LB-719

functions: thermometer, hygrometer (humidity meter) measurement: temperature, air relative humidity wide scope of work temperatures  two cable connection  digital result transmission to long distances cylinder casing adapted to be assembled in a meteorological cage

Description

LB-710R

Thermometer - hygrometer LB-710R is designed (after being placed in an additional casing - a meteorological cage LB-719) for air temperature and relative humidity measurement in the open space i. e. in a meteorological station. Thermometer - hygrometer can work in places where there is high humidity and great dustiness, since it has a hermetic casing, a teflon filter (anti pollution filter type F4) protecting the humidity sensor and because the electronic part is placed in a silicone filling compound.

Thermometer - hygrometer LB-710R is a stationary device, of small size, powered from an outside power supply. For measurement the device uses data from the temperature sensor Pt-1000 as well as from the capacitive relative humidity sensor. Basing on the knowledge of nonlinear sensor characteristics and digital calibration data stored during the calibration process in a device's memory - the microprocessor (built-in the device) counts the actual relative humidity and temperature measurement results. Those results are sent (in a digital form) from the device to a supervisory system of data collection.

The device is equipped with a digital current interface and its time course is analogous to a standard RS232C. Such interface beside data transmission is used for powering the hytherograph - using two-cable connection for this purpose where the polarity of attaching the interface's cables is optional. The device can be attached to any supervisory system i.e.: climate regulator LB-722, concentrator LB-731, panel LB-755, converter LB-486 or (using a converter LB-371) to an interface RS232C of any computer. It allows on remote control and automatic measurement data collection. It is possible for the humidity measurement results to be displayed using an additional PC program (which is included in a standard LAB-EL equipment) using such values as: dew point temperature (in °C), humidity content (g/kg) or absolute humidity (kg/m3). The device's interface output in a version LB-710R is provided by a disconnectable cable and its standard length amounts to 5m (different lengths require clients specification when ordering).

The device does not have any mechanical calibration elements (i.e.: potentiometers). The calibration of the device is performed by sending calibration data obtained in the model climate conditions through a digital interface to the device's non-volatile memory. It guarantees comfort and high calibration accuracy as well as stability of the device's meteorological parameters in time.

Each thermometer - hygrometer LB-710R (upon a request) can have an individual calibration certificate issued by the LAB-EL Calibration Laboratory.

Thermometer - hygrometer LB-710 received the certification type RP T 95 77 issued by the President of Central Measurement Office in Warsaw.

Technical data

INTERFACE

METEOROLOGICAL CAGE LB-719

• handle: an extension arm to be fastened to a mast (pipes 45 mm in diameter), cage's distance from the mast - typically 380 mm (or according to a client's request).
  

Produced by: LAB-EL Laboratory Electronics 68b, Bodycha Str., 02-495 Warsaw tel: (022) 667 71 18, 0601 209656, fax: (022) 867 53 32 e mail: info@label.com.pl home page: http://www.label.com.pl internet meteorological station: http://www.meteo.waw.pl meteorological station on a mobile phone: wap.meteo.waw.pl Last updated: 01.06.2006