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Laboratory Electronics

LABORATORY BAROMETER LB-750


  • functions: electronic barometer, reorder (logger)
  • measurement: barometric pressure
  • very reliable
  • registry up to 4000 measurement points
  • RS232C interface and digital current loop
LB-750

Description

Laboratory barometer LB-750 is designed for current atmospheric pressure measurement. The barometer works basing on three semiconductor pressure sensors. The application of three sensors in a barometer version LB-750B allows on: compensation of the individual sensor parameter scatter and detection of the emergency state in one of the sensors, what makes the device very reliable. When it comes to a barometer version LB-750W each one of the sensors is adapted for work in different scope of measurement (10..300..800..1200 hPa), what increases the measurement accuracy of the device in the whole scope.

The electric signal form the pressure sensors is measured by the analog-digital converter, and next it is tested in the microprocessor system of the barometer. Basing on the knowledge of pressure sensors characteristics conversion, the actual temperature of the pressure converters as well as the digital calibration data stored during the calibration process in the non volatile memory of the device, the microprocessor calculates the actual pressure measurement result. The measurement result is shown on the LCD screen.

The barometer has an option of the measurement result registry in the internal memory (version LB-750PR) - up to 4000 measurement points.

The measurement results are sent from the device in a digital form through a series interface "1" or "2", by which the barometer LB-750 can be attached to an outside supervisory system (i. e. concentrator LB-731, LB-473 or PC computer ). The interface "1" is used  for calibration and  programming of the barometer.

The device is equipped with a special program which allows on reading, through a PC computer interface RS232C, the actual and stored in the time function by the device the atmospheric pressure measurement results.

The barometer is made in a form of a panel casing ready to be hanged on the wall (see picture) or in a casing ready to be set on a table.

Barometers LB-750 can have an individual calibration certificate issued by the Air Force Technical Institute in Warsaw or the LAB-EL Calibration Laboratory.

Technical data

PRESSURE MEASUREMENT
Measurement inaccuracy +/- 0.4 hPa, +/- 1 last digit version B
+/- 1.0 hPa, +/- 1 last digit version W
Scope of measurement 700..1100 hPa version B
10..1200 hPa version W
Measurement resolution
+/- 0.1 hPa version B
RECOMMENDED CONSTANT WORK CONDITIONS
Scope of temperatures
10..40°C
Scope of humidity 20..80%
Level of environment corrosion aggressiveness accord. PN-71/H-04651 B
Degree of casing protection PN-92/E-08106 IP40

OUTPUT INTERFACE 1

Time and voltage transmission parameters: in accordance with RS-232 or RS-485 (optionally), 9600 bps, 8 information bits, without the evenness control, 1 stop bit.

OUTPUT INTERFACE 2

Transmission time parameters: in accordance with RS-232, 300 bps, 7 information bits, without the evenness control, 1 stop bit : - output TXD - active state of TXD line answers current 25 mA, stand-by - 15 mA; output assures galvanic isolation, working in a standard called digital current loop

OVERALL DIMENSIONS

  • "hanging" case (width x height  x depth): 130 x 180 x 106 mm,
  • "standing" case (width x height x depth): 148 x 67 x 190 mm.

POWER SUPPLY

  •  12V / 200 mA / DC or
  •  230V / 2VA / 50Hz (through an outside feeder).
Other barometers produced by LAB-EL Co.: LB-715, LB-716
GOOD CLIMATE IS FAVORABLE
See also
See also
LB-716AP/D LB-716AP/D
Elektroniczny barometr LB-716AP służy do pomiaru ciśnienia bezwzględnego, natomiast ciśnieniomierz LB-716AD do pomiaru różnicy ciśnień występującej między wysuniętymi na zewnątrz obudowy króćcami pomiarowymi. Są one ciśnieniomierzami elektronicznymi, stacjonarnym, o niewielkich rozmiarach, zasilanym poprzez interfejs S300.
LB-715 LB-715
Thermo-hygro-barometer LB-715 barometer LB-716; LB-715 is designed for air temperature, relative humidity and air pressure measurement.
Ocena produktu
Laboratory barometer LB-750 is designed for current atmospheric pressure measurement. The barometer works basing on three semiconductor pressure sensors.
Ocena: 5/5, liczba głosów: 14
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