THERMOMETER LB-710DT

functions: thermometer
measurement: temperature
built in LCD display
wide scope of temperature measurement
optional sensors for different media
two cable connection
digital result transmission to long distances

Description

Thermometer LB-710DT with a built in LCD display is designed for measurement of air temperature or different mediums. It is especially recommended for places where there is high humidity (i.e. freezers, coolers) since it is possible to attach it with an outside sensor resistant to humidity influence.

The device in a standard version has an inside sensor for temperature measurement (thermometric resistor Pt1000). Optionally, the outside sensor is connected with a meter using a cable of 1...10 m in length (depending on user requirements). In a version with an outside temperature sensor the device is designed for temperature measurement of different mediums in the scope -100...+200°C or (in "E" version) in the scope -200...+550°C according to information provided in technical data "extensions".

It is a stationary device of small size powered from an outside power supply. It is characterised by modern construction based on efficient and energy saving microprocessor servo. Basing on the knowledge of non-linear temperature sensor characteristics and digital calibration data stored during calibration in the device memory the microprocessor built in the device calculates the actual temperature measurement results.

The following measurement results are presented on a big easy to read LCD display and send out from the device through an interface approximately every 2 seconds. The output interface except from data transmission is also used for thermometer power supply – using for this purpose two cable line (i.e. telephone type) where polarity of attaching the interface cables is random.

The device can be attached to any supervisory system i.e. climate regulator LB-722, concentrator LB-731 (creating a monitoring system), panel LB-755, converter LB-486 or (using a converter LB-371) to an interface RS232C of any computer. It allows on remote and automatic collection of measurement data.

The device does not have any mechanical regulation 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 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 can have an individual calibration certificate issued by the LAB-EL Calibration Laboratory.

TECHNICAL DATA

TEMPERATURE MEASUREMENT
Measurement inaccuracy	+/- 0,1°C	+/- 1 last digit, in the scope 0 .. +50°C
	+/- 0,2°C	+/- 1 last digit, in the scope -30 .. +50°C
	+/- 0,6°C	+/- 1 last digit, in the scope -100..+200°C
	+/- 1,2°C	+/- 1 last digit, in the scope -200..+550°C
Scope of measurement	-30..+80°C	with an inside temperature sensor - LB-710DT
	-100..+200°C	with an outside temperature sensor (special) - LB-710DTX
	-200..+550°C	with an outside temperature sensor (special) - LB-710DTXE
Measurement resolution	0,1°C	in the scope -199,9...+199,9°C
Measurement resolution	1°C	outside of the scope -199,9...+199,9°C

RECOMMENDED CONSTANT WORK CONDITIONS *)
Scope of temperatures	0..40°C
Scope of humidity	20..80%
Level of environment corrosion aggressiveness accord. w/g PN-71/H-04651	B

*) 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 (using additional outside casing).

POWER SUPPLY, MECHANICAL DATA
Scope of voltage	8 ... 24V DC	from a digital current loop interface
Energy consumption	4 mA	25 mA maximum
Overall dimensions, material	110 x 65 x 28 mm	casing material ABS
Degree of casing protection	IP 30

INTERFACE

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

INTERFACE FUNCTIONS

TXD - constant measurement result transmission and thermometer powering,
RXD - storing device calibration data in its non-volatile memory.

OVERALL DIMENSIONS

measurement device: 110 x 65 x 28 mm,
standard sensor: diameter 6 mm, length 100 mm,
special sensor: according to individual settlements.

EXTENDED VERSIONS

The following thermometer versions are available upon a special order:

LB-710DT - a version for temperature measurement using an inside sensor in the scope -30...+80°C,
LB-710DTX - a version for temperature measurement using an outside sensor Pt1000 in the scope -100...+200°C,
LB-710DTXE - a version for temperature measurement using an outside sensor Pt1000 in the scope -200...+550°C.

Attention: The measurement scope provided can be additionally limited by parameters of the outside sensor used.

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