|
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 drawn and are produced by Fer Strumenti.
-
Probe
mod. 4153 compact and resistant is equipped with a strong outside pure
ricristalized 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: mm. 320, 500, 650 under
thread. Two compression fittings for mm.6x4 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 evacuate the wear of the electrode in
contact with the process and all settable parameters. The junction box is
equipped with a connector to make easy the cabling.
-
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.
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 analysers in the most hostile plants.
Connections
-
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.
Options
-
Membrane
pump and flowmeters housed inside the electronic enclosure (see picture on
the right)
-
Electronic
unit for panel mounting.
-
Pressure
reducer for the supply of air from the instrument air net instead of the
from the pump.
-
Mounting
flanges and extra tubes, ceramic and metallic for protection of the probe.
-
Shielded
cable 2x1.5 Teflon or copper or SS 6x4 tubing.
Technical
specifications
-
Measuring
field: 0,0001 ÷ 25% O2
volume
-
Accuracy:
± 0.5% of teorical 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: 250 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.
|
