Analyzers and systems for flue and combustible gas

Mod. Pro-oxy

Transmitter

 

The transmitter “Pro-Oxy” is designed to convert signals coming from the FER oxygen probe zirconia cell  and from the relative compensation for processes in high temperature model 4153, 4153ia and for processes in low temperature model 5175, 5185 and extractive. For the probes in low temperature, the same instrument supplies also to the regulation of the heater integrated in the probes. The transmitter works with all the  typical thermocouple (K, S, R, B) .

The electronic is based on a microprocessor associated to a 16 bit A/D converter. The transmitter is equipped of one active analogical 4-20 or 0-10V (selectable) output linear and proportional to the percentage of oxygen in volume, in the intervals 0÷25, 0÷10%, 0-5% and 0÷1999 ppm. The four scales are selectable in field.

 

The zirconia cell voltage and relative compensation  thermocouple have high impedance inputs in order to assure a precise and fast measure also in the case of electrodes partially consumed.

The high brightness display continuously  visualizes the oxygen content. Using the panel keys is possible to display: the compensation thermocouple temperature, cell impedance (in order to estimate the electrodes state of usury of the probe) and, protected with two level passwords, the other functions and parameters.

ZERO and SPAN calibrations are carried out without  screw potentiometer. Moreover on the converter are present an interface RS485 that supports the protocol ModBus® ASCII/RTU and optionally an RS232 that supports the protocol of printing communication for Alfa-panel 3®.

The “Pro-Oxy” has potential free contacts on high and low oxygen alarms, settable on all the field, one  (with fail safe) on. Fault and one for service signaling. The instrument is enclosed in metallic container for the panel mounting with IP20 protection degree. The instrument can be supplied also in watertight enclosure for assembly in field, with slit for reading of the display. In the  same field enclosure can be mounted the pneumatic part for reference air and calibration air and gas supplying to the zirconia probe.

Technical specifications

Inputs:

Zirconia cell voltage

Thermocouple of compensation (type B, S, R,  K settable) temperature range  20÷1800 °C

Measuring range:

Oxygen 0,0001÷26% in volume.

Precision

 ± 1% of the value of the theoretical value with a minimum of 0.1% of oxygen.

Analogical output:

 4÷20 mA /500ohm or 0-10V/10mA linear on one of the following settable range :

0-1999ppm

0-5%

0-10%

0-25%

Digital interfaces:

RS485 with ModBus® ASCII e RTU protocols

Alarms:

N.O. potential free contact for HIGH and LOW oxygen settable on the whale range. 250V 1 A max

Fault potential free contact (fail safe) for low probe  temperature or probe or the instrument breakdown. 250V/1Amax. In fault conditions, analogical current output is forced to 2 mA and that one in tension to 0 V.

Potential free contact for service signaling

Enclosure:

For panel DIN43700 72x144x p275

For field IP55 in painted sheet, dimensions:300x400x150 (option)

Protection degree:

IP20 / IP55

Peso:.

1Kg circa for panel mount enclosure .

Power:

115/230 Volt 50/60 Hz - 230W max.

Working temperature

 -10 + 45°C non condensing

Storing temperature :

 -20 +70°C non condensing

In compliance with EN50081 e EN50082

Safety

In compliance with EN61010-1