THERMOMETER- HYGROMETER LB-710L (LB-710/ML/HL/AL)

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functions: thermometer, hygrometer (humidity meter) measurement: temperature, air relative humidity wide scope of work temperatures two cable connection digital result transmission to long distances small size

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Description

Hytherograph LB-710L is designed for air temperature and relative humidity measurement in closed places (museums, warehouses, archives, laboratories). It 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 the supervisory system of data collection.

The device is equipped with a digital current interface and its time course is analogous to the standard RS232C. Such interface beside data transmission is also used for powering the hytherograph - using two-cable connection for this purpose (i.e.: telephone type), but the polarity of attaching the interface's cables is optional.

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

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 non-volatile memory of device. It guarantees comfort and high calibration accuracy as well as stability of the device's meteorological parameters in time.

Each hytherograph (upon a request) can have an individual calibration certificate issued by the LAB-EL Calibration Laboratory.

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

Technical data

TEMPERATURE MEASUREMENT
Measurement inaccuracy	+/- 0.2°C	+/- 1 last digit
Scope of measurement	-40..+85°C	version LB-710L

HUMIDITY MEASUREMENT
Measurement inaccuracy	+/- 2.0%	in the scope of 10...90%, +/- 1 last digit
	+/- 4.0%	outside of the scope 10...90%
Scope of measurement LB-710L	10..95%	for temperatures up to +40°C
	10..60%	for temperatures up to +70°C
Scope of measurement LB-710HL	0..100%	for temperatures up to +60°C
	0..70%	for temperatures up to +70°C

MEASUREMENT READINGS
Parameter	Scope of readings	Resolution
Air temperature	-40.0..+85.0°C	0.1°C
Relative humidity	0.0..100.0%	0.1%

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

*) - 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
Scope of voltage	8..24V DC
Energy consumption	3mA	average
	25mA	maximum

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.

OVERALL DIMENSIONS

Casing type L: approx. 70 x 70 x 22 mm.

EXTENDED VERSIONS

The following versions are available upon a special order:

• LB-710HL - with extended compared to standard scope of constant humidity measurement to 0...100%.
• LB-710AL - with increased temperature measurement accuracy.