THERMOMETER - HYGROMETER LB-710D / LB-710DH

functions: thermometer, hygrometer
measurement: temperature, air relative humidity
wide scope of work temperatures
two cable connection
digital result transmission to long distances
built in LCD display

Description

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/m³).

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.

The thermometer - hygrometer (upon request) can have an individual calibration certificate issued by the LAB-EL Calibration Laboratory.

Each thermometer - hygrometer LB-710 has a certification of type RP T 95 77 issued by the President of Central Measurement Office in Warsaw.

Technical data

TEMPERATURE MEASUREMENT
Measurement inaccuracy LB-710D	+/- 0,1°C	+/- 1 last digit
Scope of measurement	-30..+80°C

HUMIDITY MEASUREMENT
Measurement inaccuracy	+/- 2,0%	in the scope 10...90%, +/- 1 last digit
Measurement inaccuracy	+/- 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

MEASUREMENT READINGS
Parameter	Scope of readings	Resolution
Air temperature	-30,0..+80,0°C	0,1°C
Relative humidity	0,0..99,9%	0,1%

RECOMMENDED CONSTANT WORK CONDITIONS *)
Scope of temperatures	0..40°C
Scope of humidity	20..80%

*) Going beyond recommended constant work conditions (i.e. when installing the device in the open space) requires using additional protection means for the device's electronic part so that water out dropping does not start inside of the device (protecting the electronics with silicone or using an additional outside casing).

POWER SUPPLY, TECHNICAL DATA
Scope of voltage	8..24V DC
Energy consumption	4mA	average
Energy consumption	25mA	maximum
Casing overall dimensions	appr. 110 x 65 x 28 mm	dimensions without a hook
Material, level of casing protection	ABS	IP 30

INTERFACE

Transmission parameters: time in accordance with RS232C, 300 bps, 7 information bits, without the evenness control, 1 stop bit working in a standard of a digital current loop.

EXTENDED VERSIONS

The following versions are available upon a special order:

LB-710DH - with extended compared to a standard, scope of humidity measurement to 0...100%,
LB-710DS - with electronics additionally protected by a silicone filing compound.

GOOD CLIMATE IS FAVORABLE

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: 12.10.2005