Vaisala OMT364 Technical data
OMT364 Oxygen Transmitter for
Hazardous Areas
www.vaisala.com
The Vaisala SPECTRACAP® Oxygen Transmitter OMT364 for hazardous areas.
Features/Benefi ts
Minimizes need for sample
▪
conditioning equipment
In-situ probe or sampling cell
▪
Tolerates aggressive chemicals
▪
Tolerates excessive amounts of
▪
moisture even in liquid form
Low maintenance
▪
Calibration interval 12 months
▪
Software and keypad user
▪
interfaces and an LCD display
Example applications:
▪
fermentation, composting
process monitoring, inerting
processes and fl are gas
recovery
The Vaisala SPECTR ACAP® Oxygen
Transmitter OMT364 is designed
for oxygen monitoring in moist and
aggressive process gases.
Laser based measurement
The OMT364 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. The patented
SPECTRACAP
TDL technology in a compact probe
suitable for eld use.
®
sensor offers uniquely
FM Approved OMT364 for
Hazardous Areas
The non-incendive OMT364
transmitter is permitted for use in
Class I, Division 2 of the NEC
area classi cation according to FM
Approvals SM . The probe of the
®
500
instrument can be installed in areas
that are classi ed as Class I, Division
1 or 2.
Direct installation
In many applications, the OMT364
can be ange-mounted directly into
a process. No sampling or sample
conditioning equipment is needed.
This 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 dif cult mechanical
conditions. Due to the robustness of
the SPECTRACAP
sensitivity to gas ow and pressure
variations, the sampling system is
simple and it can be installed near
the sampling point.
®
sensor and its low
Technical data
Performance
Measurement range 0 ... 100 % O
Accuracy (including noise, linearity and
repeatability) ±0.2 % O
Temperature range over T range ±2 % of reading
Stability ±1 % of reading/yr
Zero drift ±0.1 % O
2/
Response time of measurement 3 s
Diffusion limited response in still air T63/T
without fi lters 10 s / 20 s
with stainless steel mesh fi lter 10 s / 25 s
with stainless steel mesh fi lter and
PTFE fi 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 effects for CO
and H2O uncompensated
2
< 1% of reading for <6 vol -% CO
< 1% of reading for gas dew point < 30 ˚C
Accuracy of background gas compensation
0 ... 50 vol-% CO
2
±-0.5 % of reading
0 ... 300 g/m3 H2O (Td=80 ˚C) ±1 % of reading
Operating environment
Operating temperature range for
probe (in-line installation) -20 ... +80 ˚C
electronics (housing) (Kalrez® seals)
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.
Laser safety Class 1 laser product
-20 ... +60 ˚C
Classifi cation
OMT364 CLASSIFICATIONS FOR THE TRANSMITTER
2
USA and Canada FM, Non-incendive for Class I,
2
OMT364 CLASSIFICATIONS FOR THE PROBE
yr
USA and Canada FM, Suitable for Class I, Division 1,
Division 2, Groups A, B, C, and D.
T
a
Groups A, B, C, and D.
T
90
a
Inputs and outputs
Power supply
input range 11 ... 36 VDC
Power consumption
maximum 6W
typical 3W
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
2
Mechanics
Housing material G-AlSI10 Mg (DIN 1725)
Probe material AISI 316
Housing classifi cation IP66
Weight, transmitter and probe 2.2 kg
Weight, sample cell 2.6 kg
Mounting fl ance diameter 97 mm
Cable bushing Cable gland M20 x 1.5
Stainless steel mesh fi lter openings ø 310 μm
Wetted materials
®
AISI 316, Kalrez
SiN, MgF
, PTFE (optional),
2
Options and accessories
Hydrophobic PTFE fi lter, pore size 8 μm with
Kalrez® O-rings 217056
1/2” NPT conduit fi tting 217917
Sample cell with wall-mounting bracket
gas fi ttings for O.D. 6 mm tube
volume 260 m
T63 response time with 1 l/min
sample fl ow and mesh fi lter, 18 s
with Kalrez
3
®
O-rings 216619
= -20 ˚C to +60 ˚C
= -20 ˚C to +80 ˚C
For more information, visit
www.vaisala.com or contact
us at sales@vaisala.com
Ref. B210823EN-A ©Vaisala 2009
This material is subject to copyright protection, with all
copyrights retained by Vaisala and its individual partners. All
rights reserved. Any logos and/or product names are trademarks
of Vaisala or its individual partners. The reproduction, transfer,
distribution or storage of information contained in this brochure
in any form without the prior written consent of Vaisala is strictly
prohibited. All specifi cations — technical included — are subject
to change without notice.
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