Ntron SenzTx How to use

SenzTx
Electrochemical Oxygen Analyzer
WITH 4-20mA ANALOGUE OUTPUT
Short Form User Manual
The

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.....................................................................................................................5
1.2.1 Connection ..............................................................................................................................5
1.2.2 Technical Data........................................................................................................................5
1.2.3 Installation................................................................................................................................6
1.3. Maintenance and Calibration of Measuring Cells....................................................................8

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1.1. General Information
1.1.2Intended Use of the SenzTx
The Analyzer are designed to monitor a sample containing an oxygen content to be measured within the
specified ppm or % ranges.
The Analyzer can be used in combination with the control system (PLC) or as a standalone oxygen-
measuring-system.
1.1.3The Measuring Cell/Sensor Element
This Analyzer uses an electrochemical measuring cell, which is specific to oxygen. There are nearly no
cross sensitivities for other substances. But certain substances may damage the measuring cell or
shorten its lifetime. The measuring cell is like a battery and is usually has an operating life of between
one and two years, depending on Oxygen Hours exposure and or degree of exposure to aggressive
gases/gas mixtures. Furthermore, the measuring cell may dry out in the extremely dry atmospheres
necessitating early sensor replacement.
Note!
Operating the ppm sensor at oxygen levels of >1000 ppm (e.g. in air) does not
damage the sensor element irreversibly, but it should be avoided. If exposed
to air, it will take several hours until the sensor will measure low oxygen levels
correctly in inert gas. Longer exposure to high oxygen concentration will
shorten the lifetime of the sensor.
CAUTION
Risk of damage!
The SenzTx should not be stored in a way that environmental air may
reach the Sensor. This will considerably shorten the lifetime of the
cell and should be avoided.
The package should not be unwrapped until the SenzTx is ready to be
put into service.

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1.1.4 Unintended Use of the SenzTx Analyzer
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.
CAUTION
Risk of damage!
The SenzTx Analyzer should only be operated in the way set out in this
manual.
1.1.5 Construction
The SenzTx Electrochemical 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, provided with a thread for easy changing of the measuring cell. 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.
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.
Note!
Though the SenzTx Electrochemical Sensor is a depleting element
Sensor. 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
1.2.1 Connection
The Oxygen measurement equipment is connected by a M12x1mm threaded-connecting plug (8pin).
Pin Assignment:
Pin - No .
Contac t
Cable colour
1
Not used
N/A
2
Not used
N/A
3
4-20mA output Ground
Green
4
Serial RS485 (B)
Yellow
5
Serial RS485 (A)
Grey
6
Power Ground OVDC
White
7
Supply +24 VDC
Blue
8
4-20mA Output
Red
Industry standard 4-20mA interface required. Active 4-20mA output from the SenzTx
1.2.2 Technical Data
Mechanical Data
Dimensions:
Ø47mm x 143mm(L)(Depends on model)
Process Connection
Typically, G 1/8”(Flow Through base)
Weight:
0.260 kg
Electrical Data
Supply Voltage:
24 VDC ±10%, max. 50mA
Protection Class:
IP 53
Environment
Ambient temperature:
+5 to +50 °C
Pressure:
800 to 1200 mbar
(Differential pressure between Analyzer
and electronics max. =100 mbar)
Volumetric flow-rate:
0.25 LPM ±10% recommended
Measuring
Range:
0-1000ppm, 0-1%, 0-25%
Sensitivity:
Better than +/-1% or range
25%: -0.1% O2(Vol)
Response time in operation
<180s from 21% to 1000ppm O2
<10min from 1000ppm to 250ppm
Cell Life 1):
1 Year 2)
Cross sensitivities
none for normal applications
(no aggressive gases)
1) In absence of reactive gases. Dependent also on humidity and Oxygen level exposure.
2) Sensor life is typical but dependent on many factors. (See also chapter 1.1.2 Intended Use).

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1.2.3 Installation
.
Note!
The SenzTx should be mounted vertically if possible, into the
process to ensure the maximising of operational life. It should
never be mounted upside down.
Before connecting voltage, the SenzTx Oxygen Analyzer should be exposed to
inert gas for at least 1 minute.
Typical connection diagram.
CAUTION
Risk of damage!
The SenzTx Electrochemical Oxygen Analyzer should not be subjected to moisture
in the sample gas stream. Solvents or other aggressive substances can damage the
Sensor and should be filtered out of the sample stream before being presented to
the Sensor.
Note: any unused cable cores must be suitable
insulated

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Connector position on the top of the SenzTx housing. A connecting cable is
supplied with the SenzTx.
M12 connector

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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
The Sensor connection orifice should never be cleaned with compressed Air.
Cleaning is to limited to general surface/housing cleaning.

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Ntron Ltd.
Mullaghboy Industrial Park,
Navan, Co. Meath, Ireland C15 XD61
Tel:[phone]; Fax:[phone];
email:[email protected]; web: www.ntron.com