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SenzTx
Zirconia Oxygen Analyzer
WITH 4-20mA ANALOGUE OUTPUT
User Manual
R2.0. EN 18/02/2022
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Table of Contents
1.1. General Information ............................................................. 3
1.1.2 Intended Use of the SenzTx ................................. 3
1.1.3 The Measuring Cell/Sensor Element ............. 3
1.1.4 Unintended Use of the SenzTx Analyzer ................. 4
1.1.5 Construction ................................................................. 4
1.1.6 Calibration of the Measuring Instruments ................ 4
1.2. Technical Description .......................................................... 6
1.2.1 Connection ................................................................... 6
1.2.2 Technical Data ............................................................. 7
1.2.3 Installation ..................................................................... 8
........................................................................................................ 9
1.3. Maintenance and Calibration of Measuring Cells ....... 10
Appendices ..................................................................................... 11
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1.1. General Information
1.1.2 Intended Use of the SenzTx
The Analyzer are designed to monitor a sample containing an
oxygen content to be measured within the specified ppm or %
1.1.3 The Measuring Cell/Sensor Element
ranges.
The Analyzer can be used in combination with the control
system (PLC) or as a standalone oxygen-measuring-system.
This Analyzer uses a semiconductor measuring cell made of
Zirconium dioxide and is specific to oxygen. Due to the high
temperature and the catalytic activity of the platinum coating of
the sensor it has low cross-sensitivities to other gasses. The
benefits of this technology give a long sensor life, typically 5
years or more however it should be noted that exposure to
aggressive gaseous substances can reduce the operational life
of the sensor.
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1.1.4 Unintended Use of the SenzTx Analyzer
CAUTION
The Analyzer can also be used in other applications outside of
those described in this manual. However, the user should check
with the manufacture beforehand.
Risk of damage!
The SenzTx Analyzer should only be
operated in the way set out in this manual.
1.1.5 Construction
The SenzTx Zirconia Oxygen Analyzer consists of a
measuring cell and associated electronics, separated by a
gastight clamp flange. The measuring cell (sensor) is mounted
within a metal bracket. The measuring cell is connected with
the electronics by a vacuum-tight arrangement. The
electronics is arranged in a metal housing, which is mounted
directly on a flow through adapter. The Analyzer is powered
by 24VDC and provides an analogue output signal of 4-20mA
and other additional interface signals. See section 1.2.1 for
specific information.
1.1.6 Calibration of the Measuring Instruments
The equipment is calibrated before shipping.
The calibration cycles are dependent on the
application and the applied gases.
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!
Note!
Though the SenzTx Zirconia Sensor
is a very stable instrument, Ntron
recommends a calibration check be
made at least annually by suitably
trained technicians. If it is
determined that a re-calibration is
required, please contact Ntron for
details. Calibration is not within the
scope of this manual.
After changing of measuring cells a
recalibration is mandatory.
Electronics and measuring cell are calibrated with
certified calibration gases by the manufacturer;
there are no setting options available for the user.
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1.2. Technical Description
Pin-No
.
Contac
t
Cable colour
N/A
N/A
Green
Yellow
Grey
White
Blue
Red
1.2.1 Connection
The Oxygen measurement equipment is connected by a
M12x1mm threaded-connecting plug (8pin).
Pin Assignment:
1
Not used
2
Not used
3
4-20mA output Ground
4
Serial RS485 (B)
5
Serial RS485 (A)
6
Power Ground OVDC
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Supply +24 VDC
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4-20mA Output
Industry standard 4-20mA interface required. Active 4-20mA output from
the Senz Tx
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Mechanical Data
Electrical Data
Environment
Measuring
< 5Hours to 1ppm for ppm range.
<3minutes for % range.
Dimensions:
Ø47mm x 143mm(L)(Depends on model)
Connection
Typically 1/8” (F)NPT (Flow Through
1.2.2 Technical Data
1) In absence of reactive gases.
2) Sensor life is typical but dependent on many factors. (See also
chapter 1.1. Intended Use).
Dimensions:
Process
Weight:
Supply Voltage:
Protection Class: IP66
Ambient
Pressure:
Ø47mm x 143mm(L)(Depends on model)
Typically G1/8” (Flow Through base)
0.260 kg
24 VDC ±10%, max. 50mA
-25 to +50 °C
900 to 1100 mbar
(Differential pressure between Analyzer
and electronics max. =100 mbar)
Volumetric flow-
Range:
Sensitivity:
0.25 LPM ±10% recommended
0-1000ppm, 0-25%
0.01% O2
Response time (0 -
90 %):
Warming up time: 10 minutes
Process
base)
.
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!
Note!
CAUTION
Risk of damage!
1.2.3 Installation
The SenzTx Zirconia Oxygen Analyzer should
not be subjected to moisture in the sample gas
stream when cold (not powered). It is advised
than any moisture and other contaminants are
removed from the sample gas stream prior to
entering the SenzTx measurement stream.
.
Before connecting voltage, the SenzTx
Oxygen Analyzer should be exposed to inert
gas for at least 1 minute.
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M12 Connector
1.2.4 Typical Connections
Note: any unused cable cores must be suitable insulated
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1.3. Maintenance and Calibration of Measuring Cells
All SenzTx Oxygen Analyzers undergo a certified calibration before
shipping.
User calibration is not within the scope of this manual
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Appendices
The following pages contain installation and connection drawings for the Flow
Through Base type SenzTx.
Though this manual covers the Zirconia model SenzTx, connections for
Electrochemical models are also given on page 11 for comparison purposes.
Page 12 details an example of a piping system for the application of the correct
pressures and flow rates of a gas to be sampled by the Zirconia model SenzTx.
Note, this example is for a flow base without integral orifice.
(For models with an integral Orifice in the flow base, the sample gas pressure is to be
presented at a set amount of 2Barg and this automatically produces the correct flow
rate through the SenzTx)
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Electrical and Sample gas connection information.
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Example of Sample gas piping circuit (No integral orifice)
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Mullaghboy Industrial Estate
Navan, County Meath, Ireland
C15 XD61
www.ntron.com
00353 469071333
R2.0. EN 18/02/2022
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