In situ mounting

Excellent stability.

Very fast response time.

Unaffected by high Sulphur and HCl.

No calibration required.

Absolutely safe.

Approved for zone 1

Inexpensive

 

This analyzer is an excellent solution for oxygen measuring in flue gas in the radiant section at high temperature. It guarantee a very fast response time and an accurate measure which is not affected by the outside air, which normally penetrates between the combustion chamber and the stack. The accurate compensation of the output of the zirconia cell to the temperature of the process eliminate any Zero and Span drift. Specific test carried out on purpose have demonstrated a stability within 0,1% O2 during twelve months.

 

The probe, totally ceramic, is unaffected by the most aggressive atmosphere and with high particulate content, like the combustion chamber of incinerators of contaminated liquids and gases.

 

The very competitive price is compatible with the high performance due to the simple construction of the analyzer.

 

The equipment is composed by the probe (produced in three different lengths), the field transmitter with active barriers in Ex housing and the Flowmeter box. The protection is: EEx d IIC 2G c T4 fully ATEX approved – IP 65. The probe, that has no electric power supply, is an intrinsically safe device. It generates signals lower than the dangerous limits according the safety norms. 

 

The probe mod. 4153 ia is based on a stabilized zirconium oxide cell which is warmed by the temperature of the process. Inside the probe is fitted a B type thermocouple (that does not need compensated cable). The signals of the thermocouple is used by the electronic unit to continuously compensate the output of the zirconia cell to the real temperature of the probe. The flue gas does not circulate inside the probe; it get in contact with the measuring cell on the tip of the probe by diffusion  The probe is connected to the process normally by a 4” 150 RF ANSI flange or similar. The probe can be optionally equipped with a housing which contain the flame arresters, which completely divides the atmosphere inside and outside the furnace.

The microprocessor based field transmitter mod. 8045 is housed in an Ex enclosure with glass window for display reading. Inside the enclosure  a double channel barrier is housed. Magnetic switches that can be operated without opening the housing by using a magnet through the glass window. They enable to manage all functions of the electronic unit.

 

The flow-meters box mod. 60 receives instrumentation air and gas from gas cylinder and drives reference air and test air and gas to the probe.

TECHNICAL SPECIFICATIONS

 

Measuring field: 0,0001-25% O2 by volume.

Precision:±0,5% of the theoretical value or 0,1% O2 (which ever is the greater)

Stability: within 1%.

Response time (T90): zirconia cell < 1", the hole system < 15"

Storage temperature: probe -40 °C/+80°C.

Working temperature: probe 500 ÷ 1600°C for the temperature of the process. Room temp.< 150 °C for the head of the probe; converter and barrier: -20 °C/ +50 °C.

Outputs: analog 4÷20 mA 500 ohm or 0 – 10 V 10 mA linear on one of the following fields: 0÷1999 ppm; 0÷5%;  0÷10%; 0÷25% O2. If the fault alarm is activated the analog output is forced to 2 mA or 0 V.

Alarms Potential free (SPST) contacts, O2 high and low, fault (fail safe) service and calibration in progress. For all contacts 250 V, 1 A max.

Dumper: time constant adjustable between 0 and 900 sec.

Power supply: 115V and 230 V ±10%, 50÷60 Hz, 50 V.A max. Safety according EN 61010

Protection: “c” IIC T4 – IP 65.

EMC According E 50081 and EN 50082

Connecting cable: 4x1.5 shielded. Max length 100 mt.

Probe dimensions: Immersion lengths = 650, 500, 310 mm; Diameter = 27 mm; With suitable extension tubes 1500 mm maximum immersion length can be reached.

Pneumatic connections Inox compression fittings for 6x4 tubing or ¼” NPT-F

Options: Hart & Mod-bus protocols