THERMOMETER - HYGROMETER - BAROMETER LB-715 BAROMETER LB-716

functions: thermometer, hygrometer (humidity meter), barometer
measurement: temperature, air relative humidity, barometric pressure
two cable connection
digital data transmission to long distances

Description

Meter LB-715 is designed for air temperature, relative humidity and air pressure measurement. It is a 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.

For measurement the device uses data from a temperature sensor Pt-1000, from a capacitive relative humidity sensor and from a semiconductor pressure sensor. Basing on the knowledge of nonlinear temperature sensor characteristics and digital calibration data stored during the calibration process in a device's non-volatile memory (each device is calibrated separately) the microprocessor counts the actual temperature, relative humidity and pressure measurement. The device does not have its own LCD screen to display the measurement results. The measurement results from LB-715 are sent (in a digital form- current loop) from the device to a supervisory system of data collection: (using converter LB-371 or LB-486) or through an interface RS232C to a PC computer or to a special portable reading panel LB-755, which is provided in as an additional device equipment. The interface parameters allow on sending data and powering the device using one two-cable line of any polarity. The sending line cable length is limited by the cable resistance (the resistance of both cable conductors cannot exceed 100 om).

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 a model climate conditions through a digital interface to a non-volatile device memory. It guarantees comfort and high calibration accuracy as well as stability of the device's meteorological parameters in time.

Barometer LB-716 is a less complex version of LB-715 in which there are no sensors for humidity and temperature measurement. The measurement results from the barometer LB-716 are sent from the device in a digital form (current loop) to a supervisory system of data collection (using a converter LB-371 or LB-486) or through an interface RS232C to a PC computer or to a special reading panel: stationary LB-724 or portable LB-755 that provide additional device equipment.

Thermometer- hygrometer- barometer LB-715 and barometer LB-716 can be made in a special "S" version (in a silicone filing compound), which makes them resistant to high humidity.

The device's standard version (without the silicone filing) is adapted for short time (up to few hours) measurements on the ends of measurement scopes. Except from the measurements the devices in a standard version should stay in recommended constant work conditions.

Independently from the ("S") version the devices cannot be put into immediate precipitation or water out dropping.

Each thermometer – hygrometer -barometer (barometer) (upon a request) can have an individual calibration certificate issued by the LAB-EL Calibration Laboratory (humidity and temperature measurement) and a certification of proof issued by the Air force Technical Institute in Warsaw (pressure measurement).

Technical parameters

TEMPERATURE MEASUREMENT
Measurement inaccuracy	+/- 0.1°C	+/- 1 last digit
Scope of measurement	-40..+85°C
Measurement resolution	0.1°C

HUMIDITY MEASUREMENT
Measurement inaccuracy	+/- 2.0 %	in the scope of 10...90%, +/- 1 last digit
Measurement inaccuracy	+/- 4.0%	outside of the scope 10...90%
Scope of measurement LB-715	10..95 %	for temperatures up to +40 °C
	10..60 %	for temperatures up to +70 °C
	10..40 %	for temperatures up to +80 °C
Measurement resolution	0.1 %

PRESSURE MEASUREMENT
Measurement inaccuracy	+/- 1.0 hPa	in the scope of 0..+70 °C
Scope of measurement	700..1100 hPa
Measurement resolution	0.1 hPa

RECOMMENDED CONSTANT WORK CONDITIONS *)
Scope of temperatures	+5..+40 °C
Scope of humidity	20..80 %
Scope of pressure	850..1100 hPa

*) - 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 additional external casing).

POWER SUPPLY, TECHNICAL DATA
Scope of voltage	8..24V DC
Energy consumption	15mA	average
Energy consumption	25mA	maximum
Casing overall dimensions, material	185 x 80 x 60 mm	polymas, ABS
Level of casing protection	IP 65	limited additionally by the class of filter protection

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 request:

LB-715S/LB-716S - with increased resistance to climate conditions (in a silicone filling).

Other barometers produced by us: LB-750

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: 30.10.2006