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This
analyzer is based on a Yttria fully stabilized zirconia element. It represent
an excellent solution for oxygen measuring after combustion directly in the
stack avoiding all expensive and complicated sampling and conditioning system
of the flue gas.
The
analyzer whose probe is equipped with a armored electric heater, can be used
in processes with temperature within
room and 600°C. The K type thermocouple that is built inside the probe, is
used for regulating the temperature of the cell and for compensating the
output of the cell at the actual temperature of the platinum electrodes. The
calibration is no longer necessary.
The
attractive price is compatible with the high performance of this model thanks
to its simple construction.
The
analyzer consist of the probe (produced in several lengths), the electronic
transmitter and the flowmeter box.
All
parts of the analyzer have been drawn, produced and tested by our staff.
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Probe
model 5175
compact and resistant, is fully produced in stainless steel. The flue gas
gets in contact with the cell without any circulation inside the probe.
The probe is mounted directly into the process by its four holes flange.
The probe is produced in three different standard lengths: mm. 350, 500,
1000 under flange. Outside the head are present two compression fittings
for mm. 6x4 tubing, to drive to the cell reference air and air or gas from
a cylinder to control the accurate Oxygen measuring. The probe can be
mounted in any position. We suggest the mounting in vertical position.
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Model
B705 converter.
It
is a field transmitter that can convert the signals from the zirconia cell
and the regulation and compensation thermocouple of the Fer oxygen probe
mod. 5175. Microprocessor based associated to a 16 bit analogue to digital
converter is equipped with
high brightness led display (31/2 digit) that continually displays the
volume oxygen content. On the display it is possible to call by pressing
some keys, the temperature and the impedance of the cell to evaluate the
consumption of the platinum electrode and all settable parameters.
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Flowmeter
box mod. 62 provides
reference air, with an electric membrane pump, to the probe and air or gas
(from cylinder) to control the accuracy of the reading
Parameters
to be considered for the correct use of the probe
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Maximum
temperature of the process in the point where it is planned to mount the
probe the probe.
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Particulate
content.
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Choosing
the length of the probe. To have a fast and accurate O2 reading, the tip
of the probe should stay within 1/3 and 2/3 of the stack diameter
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Temperature
of the head of the probe. It should not overtake 150°C. If higher please
contact our Technical office.
Connections
The
electric connections between the probe and the electronic unit must be done
using the special cable that can be supplied; maximum length of 100 mt.
Pneumatic
connections: n.2 using flexible or rigid 6x4 tubing.
Options
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Membrane
pump and flowmeters mounted inside the same housing of the electronic unit
(see picture)
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Panel
mounting electronic unit (mod. Pro Oxy)
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Instrument
air inside the flowmeter box instead of the electric pump.
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Ceramic
porous filter for very dusty process.
Technical
specifications
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Measuring
field: 0,0001 ÷ 25% O2
volume
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Accuracy:
± 0.5% of theoretical value or 0,1% O2 (which ever is the greater)
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Stability:
within 1%
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Response
time (90%): cell < 1", analyzer < 15"
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Temperature
limits: probe room÷600°C per the wet part inside the process, < 150 C
º for the head. Converter and flowmeter box:
-20÷ +45º C; r.h. < 90 non condensating
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Analogue
outputs: 4 ÷ 20 mA 500 ohm or 0 – 10 V 10 mA linear on one of the
following fields:
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0
– 1999 ppm;
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0
– 5%;
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0
÷ 10%;
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0
÷ 25%
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Serial
interfaces: RS232 and Mod-Bus
RTU on RS 485
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Alarm
contacts O2 high and O2 low, instrument fault
(fail safe), service. For all: 250 V, 1 A max.
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In
case of fault the analogue output is forced
to 2 mA o 0 V
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Dumper:
time constant settable between 0 e 900 seconds
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Power:
115V or 230V ± 10%, 50/60 Hz, 50 200 W
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EMC
according EN 50081 and EN 50082
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Electric
safety: according EN 61010 – 1
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Protection:
Probe IP 65. Converter and flowmeter bx: IP 55.
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Dimensions
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probe:
mm. 350, 500, 1000 mm.
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Under
flange. Diameter mm. 60.5 mm.
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Transmitter.
mm. 300x400x150, weight approx kg 11.
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Flowmeter
box mm. 230x300x170, weight approx
kg.7.
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In
situ mounting