This
analyzer based on an yttria stabilized zirconia cell, is an excellent solution
for oxygen measuring in the regeneration chambers or in the first part of the
smoke flue. The precise compensation of the output of the zirconia cell to the
real temperature of the platinum electrodes, measured by the built in
thermocouple makes the analyzer to be quite free from any drift both of zero
and span. A test has demonstrated stability within 0.1% over 12 months. The
probe is mounted inside a protection tube that guarantee a long trouble free
working service without any service. The analyzer has been drawn and tested
for use in side port , end port and unit melter furnaces.
The
system is composed by the zirconia probe (produced in two different length)
the electronic converter. The analyzer does not need any reference air.
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The
probe mod. 4153 is very compact and resistant it includes a fully
yttria stabilized zirconia cell the platinum electrode, the outside
ricristalized pure alumina tube and the B type compensation thermocouple.
The head is spaced from the threaded nipple to avoid over temperature of
the electric connections. The probe must be mounted in vertical position,
inside the protection electrofused tube that guarantees a long service and
a good response time. The vertical position of the probe enables the
convective movements inside the reference compartment of the cell to keep
the O2 value at 21.0% without any need for sending to the probe reference
air.
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The
converter mod.
H705
is a panel transmitter that can convert the electric signals incoming from
zirconia cell and the compensation thermocouple
type B of the FER high temperature oxygen probes mod. 4153.
Microprocessor based connected to an analogue to
digital 16 bit converter, is equipped with a high brightness led display
(31/2 digit) 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 connector to make the cabling easy.
Options 
·
Waterproof
version (IP 55) for field mounting.
Technical
specifications
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Measuring
field: 0,0001 ÷ 25% O2
volume
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Accuracy:
± 0.5% of theorical value or 0,1% of O2 (whichever is the greater)
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Stability:
within 1%
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Response
time: (90%): cell < 1", system < 60"
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Storage
temperature: -40°C/+80°C
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Temperature
limits:
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probe: 500°÷1600°C for the wet part in the process,
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< 200 C º
for the head of the probe.
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Converter
-20÷ +45º C; R.H. < 90 non
condensating
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Analogue
output: 4 ÷ 20 mA max load 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 e Mod-Bus RTU su
RS 485
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Potential
free alarms O2 high & 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 or 0 V
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Dumper:
time constant settable between 0 e 900 seconds
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Power:
115V - 230V ± 10%, 50/60 Hz, 50 Va max
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EMC
according EN 50081 e EN 50082
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Electrical
safety: according EN 61010 – 1
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Protection:
Probe IP 65.
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Electric
connection probe/electronic unit: copper shielded cable 2x1.5 max length mt.
100
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Dimensions
of probe: wet part = 650, 500, mm;
electro fused protection tube: outside diam. mm. 60; immersion depth mm. 564 or
mm. 714.
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