Ntron Microx-OL Specifications

Microx-OL

Oxygen Analyser

The MICROX-OL is a wall mounted instrument designed to measure the oxygen
concentration in inert gas supplied under positive pressure.

This analyser utilises zirconia or electrochemical technology to give a reliable solution
for the measurement of % and ppm oxygen ranges. The zirconia sensor life is typically

3 to 5 years when used within stated specications.

FeaturesApplications

» Gas generation (oxygen / nitrogen)

» Industrial gas applications

» Medical gas applications

» Pharmaceutical industries

» Additive manufacturing

» Zirconia or electrochemical sensor
technology options

» Measurement range: 0 to 1000ppm /

0 to 25% / 0 to 96% O2

» Simple to install and easy to operate

» Compact slimline design

» Intergral visual alarm beacon

» Internal pressure and ow regulation

» Congurable alarm relays

» 4-20mA output with RS232

communication

» LCD + 4 button HMI

» 6mm or 1/4” compression ttings

Issue No. MCXOL_01_V1_EN_0819

Microx-OL

Oxygen Analyser

Proven sensor technology

With a choice of either zirconia or
electrochemical sensor technology the

Microx-OL oers reliability, accuracy and
exibility. Both technologies have a broad

measurement capability allowing the user
to measure from selected ranges from 1ppm
to 96% oxygen.

Zirconia sensor

The Ntron zirconia oxygen sensor is a non­depleting zirconia solid electrolyte sensor.
A small capillary on the sensor controls

the diusion of oxygen into the sensor.

When heated to over 400°C oxygen is

electronically reduced causing current ow

through the zirconia electrolyte. Zirconium­oxide allows the movement of oxygen
ions through the substrate from a high to
a low concentration. The measurement of

oxygen is determined by the current owing

through the electrodes. The zirconia sensor
has an unlimited shelf life without the loss
of calibration and has an expected life in
excess of 5 years. The zirconia sensor is
not position sensitive and has low cross
sensitivity to other gases and does not dry
out.

Low maintenance and cost of ownership

Due to the highly stable nature of the

sensor, a calibration interval of once per
year is required, allowing for signicant cost

savings. The construction of our zirconia
oxygen sensor means that only 100 mL/

min of sample gas is required, providing
application exibility and further potential

cost savings.

Fast response time

Zirconia oxygen sensors respond very
quickly to oxygen concentrations in both
directions with a T90 of less than 10 seconds
within a set range.

Electrochemical sensor

The key elements of the electrochemical

sensors are a membrane, cathode, anode,

electrolyte and measurement circuit. The
sensing membrane (covering the cathode)
is made of PTFE and is mounted over a
metal perforated electrode. The space
between the membrane and the electrode

is lled either with an aqueous alkaline or
an acid electrolyte. In normal operation,

all portions of the anode and cathode are
immersed in the electrolyte. As oxygen

diuses through the membrane into the

electrolyte it causes a reaction between
the cathode and anode generating an EMF.
This current is proportional to the amount
of oxygen present in the sample gas. In the
absence of oxygen there is no output from

the electrochemical sensor, meaning only

one calibration is required.

Sensor contruction

The main body of the sensor is fabricated
from high density PVDF. The supporting ring
at the face of the sensor is constructed of
stainless steel. This results in an oxygen
sensor that is chemically resistant to most
sampling atmospheres and can be used with
trace solvents and hydrocarbons present in

the sample gas, unlike zirconia (due to the

high temperature of the sensor).

Application Setup