Analyzers and systems for flue and combustible gas

Model B705

Oxygen Transmitter

 

The B705 converter is a transmitter which can be placed in the field close to the Zirconia probe. The converter receives the signal from the Zirconia cell and from the compensation and regulation thermocouple which is fitted inside the probe (type K). The converter can be connected with any FER mod. 5175 or 5185 low temperature probe. Based on a microprocessor associated to an analogical-digital converter (12 bit) is equipped with a led display 3 ½; digit, which shows continuously the percentage of oxygen in volume on which is possible, by depressing a push button, to show the temperature of the heated probe from the compensation and regulation thermocouple and the impedance of the zirconia measuring  element. The converter is equipped with an analogical output 4-20 mA or 0-10 Volts, linear and proportional to 0-25% and 0-10%, 0-5% and 0-2000 ppm oxygen content.

Four oxygen fields are selectable from the instrument. The converter can be optionally equipped with the pneumatic part (pressure reducer or electric pump) to deliver to the probe reference air and calibration air and gas. The electronic converter, display and pneumatic device are housed in a strong water proof metal box (IP55).

Technical specifications

  • Input: zirconia cell and compensation and regulation thermocouple

  • Measuring field: oxygen 0,0001÷25% in volume

  • Accuracy of the converter: ± 1% of Full range

  • Display: 3½ digit

  • Analogical output: 4-20 mA galvanically isolated linear on 4 oxygen field:
     0,0 - 25% O2
     0,0 - 10% O2
     0,0 - 5%   O2
     10 - 2000 ppm O2

  • Dumper time constant adjustable within 0 and 999 seconds.

  • Alarms: oxygen high and low settable on a field of 0,0 - 25% with resolution 0,1%.Fault and Service alarm

  • Fail-safe: if the signals from the Zirconia cell or from the thermocouple fails, the current output will  go to 2 mA and the status alarm deenegized.

  • Power: 230 and 110 VAC 50/60 Hz 250 W max

  • Housing: water proof metal box IP 55 - 300 x 400 x 500 mm

  • Weight: kg 11 

Options

• Pneumatic device (pressure reducer or pump) for delivering to the probe reference air and  calibration air/gas.