Measuring field: 0,0001 ÷ 25% O2 volume

Accuracy: ± 0.5% of theoretical value or 0,1% di O2 (whichever is the greater)

Stability: within 1%

Response time: (90%): cell < 1", system < 15"

Storage temperature: -40°C/+80°C

Temperature limits: probe: 500°÷1600°C for the wet part in the process, < 150 C º for the head of the probe. Converter and flowmwter box -20÷ +45º C; R.H. < 90 non condensation

Analogue output: 4 ÷ 20 mA 500 ohm o 0 – 10 V 10 mA linear on one of the following fields:
    0 – 1999 ppm;
    0 – 5%;
    0 ÷ 10%;
    0 ÷ 25%

Serial interfaces: RS232 e Mod-Bus RTU su RS 485

Potential free alarms O2 high & O2 low, instrument fault (fail safe), service. For all: 25 V, 1 A max.

In case of fault the analogue output is forced to 2 mA or 0 V

Dumper: time constant settable between 0 e 900 seconds

Power: 115V - 230V ± 10%, 50/60 Hz, 50 Va max

EMC according EN 50081 e EN 50082

Electrical safety: according EN 61010 – 1

Protection: Probe IP 65. Converter and flowmeter box IP 55.

Electric connection probe/electronic unit: copper shielded cable 2x1.5 max length mt 100

Pneumatic connections probe/flowmeter box: rigid or flexible tubing mm.6x4

Dimensions :

probe: wetted part = 650, 500, 320 mm. Diameter = 27 mm. Using suitable extension tubes, the maximum light of 1500 mm immersion can be reached.

Transmitter mm.300x400x150, weight approx. kg 11.

 Flowmeter box mm. 230x300x170, weight approx. kg.7.

Options: Hart & Mod-bus protocols

This analyzer based on an yttria stabilized zirconia cell, is an excellent solution for oxygen measuring in the combustion chamber at high temperature. In that point oxygen measure is not influenced by the outside air that penetrates between the combustion chamber and the exit of the flue gas in the atmosphere. The analyzer, whose probe is not equipped with any electric heater, con be used in process with temperature within 500 and 1600°C. The probe can be used in very dusty combustions (fluid bed) keeping a fast response time. The compensation of the zirconia cell’s output to the temperature of the electrodes, measured by the platinum thermocouple makes the analyzer to be free of drift both of zero and span. A test has demonstrated stability within 0.1% over 12 months.

The competitive price is compatible with the high performances and quality of the instrument because of the easy project.   
The instrument is composed by: the probe that is the measuring element (it is produced in three lengths), the microprocessor based transmitter and the flowmeter box.
For the use of the analyzer in very hostile process we can propose suitable solutions resulting from our long experience in using this type of analyzer in different types of plants.
All parts have been designed and manufactured by Fer Strumenti and is composed from:

Probe mod. 4153 compact and resistant is equipped with a strong outside pure recrystallized alumina tube. The flue gas for the analysis get in contact with the measuring cell by diffusion without any circulation of the flue gas inside the probe. The probe is mounted directly into the process, using the provided 1” NPT thread or a flange with a central 1” NPT-F threaded hole. The probe is produced in three different standard lengths: 310, 500, 650 mm. under thread. Two compression fittings for 6x4 mm. tubing are prepared for driving to the cell the reference air and the gas with a known O2 content to carry on the accuracy test of the analyzer and operate the calibration. The probe can be mounted in any position. If it is possible to choose, we suggest the vertical position from top.

Mod. H705 converter is a field transmitter for the conversion of the electric signals from the zirconia cell and the compensation thermocouple of the FER oxygen probes mod. 4153 that are equipped with a B type thermocouple as standard and S type as option. Microprocessor based connected to an analogue to digital 16 bit converter, is equipped with a high brightness led display that continuously visualize the measured oxygen and pressing a key the temperature measured by the compensation thermocouple, the resistance of the cell at high temperature to evaluate the wear of the electrode in contact with the process and all settable parameters. The junction box is equipped with a extractable connector to make easy the electrical connection.

Flowerer’s box mod. 62 supplies to the probe reference air produced by an electric pump and air or gas form cylinder to enable the control of accuracy and operate the calibration.

Options:

Membrane pump and flowmeters housed inside the electronic enclosure

Electronic unit for panel mounting.

Pressure reducer for the supply air to the probe not from pump but with instrument air.

Mounting flanges and extra tubes, ceramic and metallic for protection of the probe.

Shielded cable 2x1.5 Teflon or copper or SS 6x4 tubing.

Parameters to be considered for a good use of the probes:

Maximum and minimum temperature of the process where the probe will be installed.

Particulate content.

Length of the probe. In the processes with a high temperature it is not necessary the probe to protrude inside the combustion chamber more than 100 / 120 mm.

 Temperature of the head of the probe.

For any doubt, please contact our technical office that has a long experience in using this type of analyzers in the most hostile plants.

Download catalogue:
 

Two electric connections from the probe to electronic unit, using normal copper shielded cables.
Two pneumatic connections from the probe to flowmeter box (or electronic housing if the pneumatic part is included in the housing of the electronic unit.) using mm. 6x4 tubing.

In situ mounting

High response time

Resistant to aggressive atmospheres

No calibration for drift needed

Suitable for dusty processes

Advanced transmitter