Thermometer - hygrometer LB-710D with a built in LCD display is designed for temperature and air relative humidity measurement in rooms. It is a stationary device of small size powered from an outside power supply.
For measurement the device uses: data from a temperature sensor Pt-1000 and from a capacitive relative humidity sensor. Basing on the knowledge of non-linear 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 displayed on the built in LCD display and sent out from the device (in a digital form) 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 also used for powering the hytherograph - using a two-cable connection for this purpose (i. e. type used in installing telephones), where polarity of attaching the interface's cables is optional. The device interface output in a version LB-710D is made in a form of screw terminals placed inside a casing.
The device can be attached to any supervisory system i.e.: a climate regulator LB-722, a concentrator LB-731, LB-473 (creating a monitoring system), a panel LB-755, a 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 the standard LAB-EL equipment) using such values as: dew point temperature (in °C), humidity content (g/kg) or absolute humidity (kg/m 3).
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 a non-volatile memory of the device. It guarantees comfort and high calibration accuracy as well as stability of the device's meteorological parameters in time.
Each thermometer - hygrometer LB-710 has a certification of type RP T 95 77 issued by the President of Central Measurement Office in Warsaw.
|Measurement inaccuracy LB-710D||+/- 0,1°C||+/- 1 last digit|
|Scope of measurement||-30..+80°C|
|Measurement inaccuracy||+/- 2,0%||in the scope 10...90%, +/- 1 last digit|
|+/- 4,0%||outside of the scope 10...90%|
|Scope of measurement LB-710D||10..95%||for temperatures up to +40°C|
|10..60%||for temperatures up to +70°C|
|10..40%||for temperatures up to +85°C|
|Scope of measurement LB-710DH||0..100%||for temperatures up to +60°C|
|0..70%||for temperatures up to +70°C|
|0..40%||for temperatures up to +85°C|
|Parameter||Scope of readings||Resolution|
|RECOMMENDED CONSTANT WORK CONDITIONS *)|
|Scope of temperatures||0..40°C|
|Scope of humidity||20..80%|
|POWER SUPPLY, TECHNICAL DATA|
|Scope of voltage||8..24V DC|
|Casing overall dimensions||appr. 110 x 65 x 28 mm||dimensions without a hook
|Material, level of casing protection||ABS||IP 30|