TEMPERATURE / HUMIDITY REGULATOR LB-474
thermometer / psychrometer / microprocessor controller

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functions: 2 channel thermometer, precise regulator PID (1...2 channels) measurement: 2 temperatures stationary device big, easy to read display interface RS-232C and S300

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DESCRIPTION

Controller LB-474 is a microprocessor temperature or humidity regulator. The regulator can be used for controlling such devices as i.e. a wood drying chamber, an injection moulding machine, an incubator, a hot bath etc.

The device’s thermometers perform measurement of two temperatures using the outside sensors with a platinum thermoresistor Pt1000 (or optionally Pt100). Using the platinum thermoresistors assures high measurement accuracy and constant thermometer characteristics. The outside temperature sensors are made in the casings adjusted in construction to individual requirements. Different versions of the sensor casings allow on measurement of different media in various scopes of temperatures. Two thermometers can also create a psychrometer (based on a principle of the wet bulb and dry thermometers) what allows on measurement and regulation of air temperature and humidity independently. The temperature sensors are attached to the regulator using two or four cables with the clamps. 

Temperature measurement path is calibrated by a producer and the calibration data is stored in the panel in a digital form. The controller does not have any mechanical calibration elements (i.e. potentiometers). The device’s calibration is performed by sending the calibration data obtained in the standard climate conditions through a digital interface to a non-volatile calibration memory of a thermometer. It guarantees comfort and high calibration accuracy as well as stability of the device’s meteorological parameters in time.

The user has a possibility of (by using two key buttons) setting the required work parameters in the regulator. The regulation works based on PID algorithm. PID regulation parameters can be set by the user, after attaching the regulator to a PC computer (on which a special service program had been started) or from a keyboard.

The regulator LB-474 has five control outputs with the transistor key outputs, designed for controlling the external transmitters in (i.e. in a form of an external transmitters of block LB-475). Optionally it can have an analogue output 0..10V or 4..20mA for controlling other devices.

Through a series voltage interface RS-232 the device can be attached to any computer system, what allows on remote collection of the current measurement results.

The device is designed for application in stationary conditions, its casing has attachments allowing on assembly on a standard rail TS35. The panel has a big, easy to read LED display allowing on display of two temperatures: set (10 mm) and intended (25 mm). The device is powered from the energy network 230V.

The regulator with the temperature sensors, adequately to an order, can have an individual calibration certificate concerning temperature / humidity measurement path from the Calibration Laboratory LAB-EL.

TECHNICAL DATA 

TEMPERATURE MEASUREMENT
Version	Scope of measurement	Measurement inaccuracy with individual sensor calibration	Measurement inaccuracy without individual sensor calibration
LB-472	-150..259°C	+/- 0,1°C, +/- 1 last digit (in the scope 50°C)	+/- 1,5°C, +/- 1 last digit

MEASUREMENT READINGS
Parameter	Scope of reading	Resolution displayed
Temperature – basic scope	-99,9..+99,9°C	0,1 or 1°C
Temperature – extended scope	-150..+259°C	1°C

POWER SUPPLY, CONTROL OUTPUT
network power supply	230V 50 Hz
energy consumption	5 VA
control outputs fan-out (thermoresistor keys)	40 V / 500 mA / DC
type of fan-out	resistance or a transmitter coil

SCOPE OF WORK TEMPERATURES
Device	Scope	Comments
Regulator LB-474	0..+50°C
Temperature sensor	-60..+90°C	basic range, limited additionally by a temperature sensor's construction
	-150..+259°C	extended range, limited additionally by a temperature sensor’s construction

RECOMMENDED CONSTANT WORK CONDITIONS LB-472
Scope of temperatures	10..40°C
Scope of humidity	20..80%
Level of environment corrosion aggressiveness according to PN-71/H-04651	B
Class of resistance according to DIN40050	IP40

*) - Going beyond recommended constant work conditions (i.e. when installing a device in the open space) requires applying additional safety means for the device's electronic parts protecting from water out dropping inside the device (application of an additional outside casing).

INTERFACE I - voltage

Series RS232C, 3 lines (RxD, TxD, GND), transmission parameters: 9600 bps, 8 bits of information, without evenness control, 1 stop bit.

INTERFACE FUNCTIONS I

Possibility of reading the measurement results and storing the device's calibration results in its non-volatile memory.

INTERFACE II - current

Series so called digital current loop, 1 line TXD (TXD line active status complies with 25 mA current, in the rest stage 15 mA), transmission parameters time in accordance with RS232C: 300 bps, 7 bits of information, without evenness control, 1 stop bit.

INTERFACE FUNCTIONS  II

Possibility of sending the measurement results automatically to long distances in big measurement systems (i.e. to a multi-sensor climate supervision system - see LB-473). Output with a galvanic isolation.

OVERALL DIMENSIONS

Panel casing (to be hanged on a rail TS35) overall dimensions: 158 x 90 x 58 mm.

Attention: The device should be installed inside an additional outside casing, i.e. wall switch gear. Climate category of the additional outside casing has to be adjusted to the conditions dominating in the place of installation. No cables are supplied with the device (including a power supply cable) as an installation component for only an authorized person.

EQUIPMENT

• cable for the interface RS232C,
• program "User's Interface" for a PC computer.