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Oxygen

OMT355 Oxygen Transmitter for Industrial

Process Measurements

The 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

The Vaisala SPECTRACAP

Oxygen Transmitter OMT355 is

ideal for oxygen monitoring in

moist and aggressive process

gases.The 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. The SPECTRACAP

sensor offers TDL technology in a

compact probe suitable for eld use.

The Vaisala SPECTRACAP

Oxygen Transmitter.

Direct installation

In many applications, the OMT355

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

sensor and its low

sensitivity to gas ow and pressure

variations, the sampling system can

be very simple and it can be installed

near the sampling point.

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

▪

Typical applications:

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monitoring

OMT355 with the sampling cell.

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 effects and provides

a maintenance alert well before

the measurement performance is

affected.

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. The

calibration interval of the OMT355 is

12 months.

User friendly interfaces

For calibration and conguration, the

OMT355 features both software and

keypad user interfaces and an LCD

display.

TDL Technology

The Tunable Diode Laser

(TDL) technology used in the

SPECTRACAP

sensor is one of the

most powerful technologies in gas

measurement on the market today.

The 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.

Therefore, the measured attenuation

is an extremely selective measure for

the amount of oxygen on the path of

the laser beam.

Technical data

Performance

Measurement range 0 ... 100 % O

Accuracy

(including noise, linearity, and repeatability)

±0.2 % O

Temperature dependence over T range ±2 % of reading

Stability ±1 % of reading/yr

Zero drift ±0.1 % O

/yr

Response time of measurement 3 s

Diffusion limited response in still air T

without ﬁlters 10 s / 20 s

with stainless steel mesh ﬁlter 10 s / 25 s

with stainless steel mesh and PTFE ﬁlters 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 H

O, uncompensated

<1 % of reading for <6 vol-% CO

<1 % of reading for gas dewpoint < 30 °C

Accuracy of background gas compensation

0 ... 50 vol-% CO

±0.5 % of reading

0 ... 300 g/m

O (T

= 80 °C) ±1 % 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 

Serial output (2-wire, non-isolated) RS-485

Alarm/control relay 30 VAC/60 VDC

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 1 laser product

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