TEMPERATURE REGULATOR LB-472
thermometer / microprocessor controller

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functions: thermometer, precise temperature regulator PID measurement: temperature stationary device big, easy to read display interface RS-232C and S300

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DESCRIPTION

Controller LB-472 is a single channel microprocessor temperature regulator. The regulator can be used for controlling such devices as i.e. a milk pasteurizer, a drier, a wielding machine, an injection moulding machine, an incubator, a warm bath etc.

The device’s thermometer performs temperature measurements using an outside sensor with a platinum thermoresistor Pt1000 (or optionally Pt100). Using the platinum thermoresistor assures high measurement accuracy and constant thermometer characteristics. The outside temperature sensor is made in a casing adjusted in construction to individual requirements. Different versions of a sensor casing allow on measurement of different media in various scopes of temperatures. The temperature sensor is attached to the regulator using two or four cables with the terminals. 

Temperature measurement path is calibrated by a producer and the calibration data is stored in a panel in a digital form. The thermometer 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 thermometer memory. It guarantees convenience and high calibration accuracy as well as stability of the device’s meteorological parameters in time.

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

The temperature regulator LB-472 in standard has two control outputs with two transmitters designed for controlling a trilateral controller. Optionally it can also 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 big, easy to read LED display allowing on displaying two temperatures: set (10 mm) and measured (25 mm). The device is powered from the 230V power network.

The regulator with a temperature sensor, adequately to an order, can have an individual calibration certificate of a temperature measurement path from the Institute of Energy in Warsaw or 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 readings	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	230V / 50Hz / 1A
load type	resistance

SCOPE OF WORK TEMPERATURES
Device	Scope	Comments
Regulator LB-472	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 the device in the open space) requires using an 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).

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 of device's calibration results in its non-volatile memory.

INTERFACE II - current

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

INTERFACE FUNCTIONS  II

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

OVERALL DIMENSIONS

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

Attention: The device should be installed inside an additional outside casing, i.e. wall switchgear. Climate category of additional outside casing has to be adjusted to conditions that control the installation place. The device is provided without cables (also without a power supply cable) as a component for installation only by an authorized person.

EQUIPMENT 

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