Vaisala OMT355 Technical data
Vaisala Instruments Catalog 2009
Ref. B210768EN rev. A
P.O. Box 26, FI-00421 Helsinki, FINLAND
Email: industrialsales@vaisala.com
www.vaisala.com/OMT355
OMT355 Oxygen Transmitter for Industrial
Process Measurements
Features/Benefits
• Minimizes need for sample
conditioning equipment
• In-situ probe or sampling cell
options
• Tolerates aggressive chemicals
• Tolerates excessive amounts of
moisture even in liquid form
• Low maintenance
• Diagnostic output for preventive
maintenance
• Heated optical surfaces to prevent
condensation
Tel: +358 9 894 91
Fax: +358 9 8949 2485
e Vaisala SPECTRACAP® Oxygen Transmitter.
e Vaisala SPECTRACAP® Oxygen
Transmitter OMT355 is ideal for
oxygen monitoring in moist and
aggressive process gases. Typical
applications include gas generation,
inert gas blanketing, fermentation and
composting process monitoring.
Laser based measurement
e OMT355 incorporates a compact
tunable diode laser (TDL) gas
spectrometer built in the measurement
probe. This optical measurement
technology is well known for
unmatched stability and robustness.
For the first time, the SPECTRACAP®
sensor offers TDL technology in a
compact probe suitable for field use.
Direct installation
In many applications, the OMT355
can be ange-mounted directly into
a process. No sampling or sample
conditioning equipment is needed.
is feature provides real time
measurement data without sampling
or sample switching delays.
Sampling cell installation
An optional sampling cell is available
for processes with high temperatures,
elevated pressures or extremely
dicult mechanical conditions. Due to
the robustness of the SPECTRACAP®
sensor and its low sensitivity to gas
flow and pressure variations, the
sampling system can be very simple
and it can be installed near the
sampling point.
Low maintenance
A stainless steel mesh lter and an
optional porous PTFE lter protect
the OMT355 probe optics from dust
and dirt. An intelligent measurement
algorithm further minimizes
contamination eects and provides
a maintenance alert well before the
measurement performance is aected.
OMT355 with the sampling cell.
Long calibration interval
Calibration or eld checking of
the instrument can be done either
with ambient air or with zero/span
gases injected through an optional
calibration gas connector. e
calibration interval of the OMT355 is
12 months.
User friendly interfaces
For calibration and conguration, the
OMT355 features both software and
keypad user interfaces and an LCD
di sp lay.
TDL Technology
e Tunable Diode Laser (TDL)
technology used in the SPECTRACAP®
sensor is one of the most powerful
technologies in gas measurement on
the market today.
e technology is based on measuring
the attenuation of a beam of laser light
in the sample gas. For oxygen sensing
the laser is tuned to a wavelength
which is characteristic and unique for
the oxygen molecule. erefore, the
measured attenuation is an extremely
selective measure for the amount of
oxygen on the path of the laser beam.
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106
Vaisala Instruments Catalog 2009
Ref. B210768EN rev. A
OMT355 OXYGEN
Technical Data
Performance
Measurement range 0 ... 100 % O2
Accuracy
(including noise, linearity, and repeatability)
Temperature dependence over T range ±2 % of reading
Stability ±1 % of reading/yr
Zero drift ±0.1 % O
Response time of measurement 3 s
Diusion limited response in still air T
without lters 10 s / 20 s
with stainless steel mesh lter 10 s / 25 s
with stainless steel mesh and PTFE lters 30 s / 70 s
Pressure dependence without pressure compensation
0.8 ... 1.2 bar -2 % of reading
1.2 ... 1.4 bar -5 % of reading
Accuracy of pressure compensation ±0.25 % of reading
Background gas eects for CO
Accuracy of background gas compensation
0 ... 50 vol-% CO
0 ... 300 g/m
Operating Environment
Operating temperature range
for probe (in-line installation) -20 ... +80 °C
for electronics (housing) -40 ... +60 °C
for transmitter (ambient gas
measurement -20 ... +60 °C
Storage temperature range -55 ... +80 °C
Operating pressure range 0.8 ... 1.4 bar
Maximum pressure range for probe up to 10 bar
Compliance
IEC(EN)-61326 Electrical equipment for measurement, control
and laboratory use. EMC requirements
EN50104 Electrical apparatus for the detection and
measurement of oxygen. Performance requirements and test
methods.
EN50271 Electrical Apparatus for the Detection and
Measurement of Combustible Gases, Toxic Gases or Oxygen
Laser safety Class 3R laser product
2
3
H2O (Td = 80 °C) ±1 % of reading
and H2O, uncompensated
2
<1 % of reading for <6 vol-% CO
<1 % of reading for gas dewpoint < 30 °C
±0.2 % O
2
63/T90
±0.5 % of reading
Inputs and Outputs
Power supply
input range 11 ... 36 VDC
Power consumption
maximum 6 W
typical 3 W
Analog output 0/4 ... 20 mA, sourcing
maximum load 500 Ω
Serial output (2-wire, non-isolated) RS-485
Alarm/control relay 30 VAC/60 VDC
Mechanics
Housing material G-AlSi10 Mg (DIN 1725)
Probe material AISI 316
Housing classication IP66
Weight 2.2 kg
Mounting ange diameter 97 mm
Can be tted to standard anges. Minimum sizes:
DIN (2527B) DN50 and ANSI (150) 2.5”
/yr
Cable bushing Cable gland M20 x 1.5
Stainless steel mesh lter openings ø 310 µm
2
Wetted materials
AISI 316, EPDM or Kalrez® (optional), PTFE (optional), SiN, MgF
Options and accessories
Hydrophobic PTFE lter, pore size 8 µm
with EPDM O-rings 217055
with Kalrez
1/2” NPT conduit tting 217197
M12 male 8-pin connector for
user cable
Serial interface cable for PC 19446ZZ
USB-RJ45 Serial interface cable 219685
Sample cell with wall mounting bracket
2
with EPDM O-rings 217052
with Kalrez
For complete specications, refer to the User’s Guide.
® O-rings
® O-rings
Dimensions
Dimensions in mm 306 mm x 184 mm x 74 mm
SPECTRACAP® is a registered trademark of Vaisala.
Specications are subject to change without prior notice.
© Vaisala Oyj
2
217056
214806SP
216619
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