Ntron Microx Online Operator's manual

Microx Online
Issue Number:
1.14
Issue Date:
17-07-2018
The
User Instruction Manual
Oxygen Analyser
With Electrochemical Sensor
Rev 1.0

1Introduction ....................................................................................................................... 1
1.1 Microx Online Analyser........................................................................................... 1
1.2 Operation.................................................................................................................... 2
1.2.1 %Vol Sensor........................................................................................................ 3
2Specification...................................................................................................................... 4
3Physical data..................................................................................................................... 5
3.1 Mounting and Dimensions ..................................................................................... 5
3.1.1 Field Connections............................................................................................... 6
3.1.4 Mounting Locations and Installation................................................................. 9
3.4 RS232 connections............................................................................................... 11
3.5 Analogue Output................................................................................................. 11
4Software Features.......................................................................................................... 12
4.1 Password.................................................................................................................. 12
4.1.1 Menu 1 –Calibrate sensor............................................................................... 14
4.1.2 Menu 2 –Analogue output FSD...................................................................... 15
4.1.3 Menu 3 –Set 4 mA output............................................................................... 15
4.1.4 Menu 4 –Set 20 mA output............................................................................. 16
4.1.5 Menu 5 –Analogue Output Simulation.......................................................... 16
4.1.6 Menu 6 –Sensor selection.............................................................................. 17
4.1.7.................................................................................................................................... 17
4.1.8.................................................................................................................................... 17
4.1.9.................................................................................................................................... 17
4.1.7 Menu 7................................................................................................................ 17
4.1.8 Menu 8 - Diagnostics........................................................................................ 17
4.1.9 Menu 9 - Restore.............................................................................................. 18
4.1.10 Menu 10 –Zero offset...................................................................................... 18
4.1.11 Menu 11 –PPM sensor Gain.......................................................................... 19
4.1.12 Menu 12 –% vol sensor gain.......................................................................... 19
4.1.13 Menu 13 –Sensor damping............................................................................ 20
4.1.14 Menu 14 –New sensor data............................................................................ 20
4.1.15 Menu 15 –Electronics zero............................................................................. 21
4.1.16 Menu 16 –Noise Rejection ............................................................................. 22
4.1.17 Menu 17 –Relay............................................................................................... 23
4.1.18 Menu 18 –Alarm levels.................................................................................... 24
4.1.19 Menu 19 –Alarm hysteresis............................................................................ 24
5Routine Maintenance & Servicing.............................................................................. 25
5.1 Routine Inspection and Maintenance................................................................ 25
5.2 Sensor Replacement.............................................................................................. 25
5.3 Password.................................................................................................................. 26

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1 INTRODUCTION
1.1 Microx Online Analyser
The Microx Online is a wall or surface mounting instrument is for the
measurement of % Oxygen volume levels taken from a process line.
Typically the sample source would indicate the Oxygen level in the related
process and the Microx Online would be configured to initiate an Alarm
condition if the Oxygen content measured is too high.
This can be typically be for process purity reasons such as in Nitrogen
generation processes. Thus the inverse of the Oxygen measurement can also
indicate the level of Nitrogen in the process being measured.
Key design features are:
•Sturdy compact enclosure
•Simple keypad calibration facility (utilising onboard LCD display).
•4-20mA current source output for gas level indication (10-bit
resolution).
•230VAC or 24VDC power supply
•RS232 output for transmission of live data to a PC.
•Status indicating light tower for audible/visual warning as an
option.
The Sample gas is supplied from( and exhausted to*) the sample location to
the via pipework provided and installed by the customer.
This sample gas is supplied under small positive pressure which can be
regulated down to a suitable level via the Regulator device within the Microx
Online Analyser.
The Sample gas then enters (and leaves) the Microx Online via integral 6mm
Bulkhead fittings.
*Alternatively, The Exhausted sample gas can be piped to a suitable vent
location.
Note! This Instrument is for Safe, Non-Hazardous(Non-Ex) locations of
operation only.

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1.2 Operation
When power is applied to the Microx Online Analyser, an initialisation
procedure is performed as follows:
•All the display segments are displayed
•The software version number is displayed
•The company name is displayed
•The sensor type is displayed
•The display then shows the gas level.
The Microx Online is now operational.
Note: The Microx Online Oxygen Monitor is based around the Microx
series of Oxygen Analyser controllers and contains some Menu
programming options which are not relevant to this Microx product and
its mode of operation.
Such menu’s and information are highlighted in this user manual as
‘Customer Access Not Permitted’ and other various warnings against
adjustment of such menu options. Please observe these prohibitions to
ensure correct operation of the Microx Online Oxygen Analyser
The Microx Online Oxygen Analyser is supplied factory configured and
calibrated for correct operation, and apart from sensor replacement and
periodic calibration, should require no further user intervention.

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1.2.1 %Vol Sensor
A % Volume Electrochemical sensor is an integral part of the Microx Online.
The % Volume measurement range of the Microx Online is factory set at 0 to
25%, with calibration at 20.9% O2.
This model uses Electrochemical technology Sensor which should give
accurate trouble free service during its lifetime. This is a consumptive type
Sensor and as such disposable* and requires regular periodic calibration and
replacement after 1 to 2 years operation(application dependent)
It needs to be ensured that if contaminants are present in the process from
where the sample is being taken, these are prevented from entering the
pipework and sensor.
Contaminants may include particulates or certain heavy vapours. Inline
Filtration of the sample may be required.
*Sensor is not be disposed of into the general waste stream but
disposal should be according to local waste recycling requirements, and due
to hazardous substances being released on destruction of the Sensor, only
approved/certified recyclers should be used for disposal.

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2 SPECIFICATION
Supply
Input Voltage
Options:
2310VAC/24 VDC.
Supply current:
140 mA at 24VDC nominal all relays energised,
20 mA drawn on current loop.
Outputs
Analogue Output:
4-20mA analogue output (10-bit resolution)
Sensor Input
No of Channels:
1
Sensor
%Vol oxygen 0-25% Electrochemical OC-32
Relays
3
Single pole change over.
Rating 6 Amps 250 v AC
Fuses
Fuse
500mA anti-surge on board fuse for circuit
protection.
Additional Features
Display:
4 Digit, 7 Segment Display.
Keypad:
4-Button Keypad
Software:
Software configuration, calibration and data
logging provided by PC communications.
RS232 Output
Weight
1.3Kg
Dimensions
219(265 inc. fittings)x280x156 (LxHxD)
Operating Temp.
-30oC to +400C

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3 PHYSICAL DATA
3.1 Mounting and Dimensions
Fig.1 shows the overall dimensions of the Gasenz on line.

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3.1.1 Field Connections
All connections to the module are provided in the form of screw terminals.
Access is gained by opening the Microx Online enclosure to reveal the
terminal connector strips on the rear of the control module backplate
NOTE: Confirm the Voltage supply option of the instrument before connecting
power.(230VAC or 24VDC)
The user field connection points are illustrated below. Cable glands are
provided for power and interface cabling.
The User is to make all field connections in suitable cable to local
regulation codes and taking into account the power requirements of the
instrument as detailed in section 2 (Specification) of this manual.
The AC supply connection should be protected by an upstream protective
device. 24VDC is available at the 24VDC terminals if an AC supply is connected.
If AC mains supply is not available then it is possible to power the unit from
24VDC source via these terminals.

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Internal layout

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3.1.4 Mounting Locations and Installation
The Microx Online is a fixed gas detection system and should be installed so
as to provide effective analysis of a process sample, either at end of line or
from a process pipeline or vessel. The Alarm indication thus rendered by the
Microx Online should be able to initiate the following actions as required:
Indication of ‘Alarm’level oxygen content.
Shut Down of process or plant.
Alarm relayed back to customer PLC/DCS.
In general, fixed systems should be installed so that maintenance of failure of
one of the instrument does not compromise the safety of the process being
measured.
Factors to take into consideration when choosing a location to mount the
Microx Online:
Location of suitable process sample point.
Visibility of status indicator tower (Light Tower)
Sufficient space on vertical surface or wall for secure mounting and access to
the instrument.
Nature of gas to be measured.
Pressure of gas to be measured at point of sample take-off.
Routing of sample in and exhaust pipework.
The Microx Online has 6mm Bulkhead Compression fittings for Sample In and
Sample Out(Exhaust) pipe work. Typically the Pipework is of Stainless Steel
but flexible PVC or other tube could be used if space limitations or other
factors favour this.
It is the end user’s responsibility to ensure the correct and suitable pipe or
tube is used for the installation.

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3.4 RS232 connections
Microx
PC Connections
Function
Function
9-way ‘D’
25-way ‘D’
TxD
RxD
2
3
RxD
TxD
3
2
0V
0V
5
9
3.5 Analogue Output
The analogue output provides a means of indicating to external equipment
(e.g. data loggers, remote displays) the gas levels currently being detected by
the system. The output is that of a Current Source (4-20mA), where 4mA
represents zero gas and 20mA represents gas at the sensor FSD.

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4 SOFTWARE FEATURES
The menu system featured within the Microx Online allows all calibration and
configuration activities to be performed.
A B C D
The keypad has the following functionality:
Button
Function
Alternate Function
A
Menu Open/Close
B
Enter
C
Next (Increment)
D
Previous (Decrement)
4.1 Password
The Microx Online uses a password system to restrict the end user from
carrying out certain changes that may compromise the use of the equipment.
The menu system is split into two areas, user and engineer. The user has
access to menu options E:1 to E:9, while the engineer has access to menu
options E:1 to E:19.
See the end of this document (5.2) for password access information.
20.9

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Menu options
Menu
option
Function
E:1
Calibrate Sensor
E:2
Analogue output FSD
E:3
Set 4 mA
E:4
Set 20 mA
E:5
Sensor simulation
E:6
Customer Access Not permitted
E:7
Customer Access Not permitted
E:8
Diagnostics
E:9
Restore
E:10
Customer Access Not permitted
E:11
Customer Access Not permitted
E:12
% Vol Sensor Gain
E:13
Sensor Damping
E:14
New Sensor Data
E:15
Electronic Zero
E:16
Noise Rejection
E:17
Relay
E:18
Alarm Levels
E:19
Alarm Hysteresis

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4.1.1 Menu 1 –Calibrate sensor
This should ideally be performed using certified compressed Gas @20.9%
Oxygen. This is typically provided from a portable cylinder with a suitable flow
and pressure control adaptor. It may be necessary to disconnect the sample in
pipe/tube connection to the Microx Online, and connect a suitable tube from
the portable cylinder into the sample in bulkhead fitting.
Alternatively, if 20.9% Oxygen can be introduced safely into the process line,
this can be another option for calibration.
Where neither of the above are possible, an Ambient air calibration can be
made but as no pressure and hence flow will be behind the Oxygen , the
characteristics of the calibration with still Air as opposed to pressurised Air will
result in some measurement reading offset of small value, when the sample
gas is re-connected.
•Press the MENU button to open the menu system.
•Using the NEXT and PREVIOUS buttons select menu option:
E:1
•Press ENTER.
•Allow time for sensor to respond/stabilise.
•Using the INC and DEC buttons set the reading to that of the
calibration gas level.
•Press ENTER to span the sensor, ‘––––‘will be displayed to
confirm the sensor span has been performed.
Note: Pressing the MENU button rather than the ENTER
button exits the span feature without performing the
calibration.
Wait until the reading is stable, if not press the ENTER
button to span the sensor.
•Press the MENU button to close the menu system.
Note: The sensor span setting will be displayed ( as a
percentage value) on exit while the MENU key is pressed.
Note that this value is a percentage of the initial calibration
value set via “New Sensor Data” in menu E:14. See note
below.
Note: On each occasion that a new sensor is connected and calibrated the
“New Sensor Data” should be set via the procedure in menu 14. The
setting should only be carried out after the calibration and not before.
This will ensure that subsequent span setting figures displayed on exit
of menu 1 will be valid.

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4.1.2 Menu 2 –Analogue output FSD
•Press the MENU button to open the menu system.
•Using the NEXT and PREVIOUS buttons select menu option:
E:2
•Press ENTER.
•Using the INCREASE and DECREASE buttons adjust the FSD
to the required level.
•Press ENTER.
Note: Pressing the MENU button rather than the ENTER
button exits the sensor FSD feature without any change.
•Press the MENU button to close the menu system.
Note: The Sensor FSD will be displayed on exit while the
MENU key is pressed.
4.1.3 Menu 3 –Set 4 mA output
•Monitor the current sourced from the analogue output of the
OEM module using a multimeter set to read milliamps.
•Press the MENU button to open the menu system.
•Using the NEXT and PREVIOUS buttons select menu option:
E:3
•Press ENTER.
•Using the INCREASE and DECREASE buttons adjust the
output to 4mA .
•Press ENTER.
Note: Pressing the MENU button rather than the ENTER
button exits the 4 mA feature without performing the
calibration.
•Press the MENU button to close the menu system.
Note: The 4 mA factor will be displayed on exit.

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4.1.4 Menu 4 –Set 20 mA output
•Monitor the current sourced from the analogue output of the
OEM module using a multimeter set to read milliamps.
•Press the MENU button to open the menu system.
•Using the NEXT and PREVIOUS buttons select menu option:
E:4
•Press ENTER.
•Using the INCREASE and DECREASE buttons adjust the
output to 20 mA.
•Press ENTER.
•Press the MENU button to close the menu system.
Note: The 20 mA factor will be displayed on exit.
4.1.5 Menu 5 –Analogue Output Simulation
The Gasnz analogue output can be tested for functionality via menu 5.
This option allows the user to simulate the analogue output.
•Press the MENU button to open the menu system.
•Using the NEXT and PREVIOUS buttons select menu option:
E:5.
•Use the UP and DOWN button to increase or decrease the
analogue output. The value displayed on the Microx display will
be equivalent to the analogue output.
•Press the MENU button to close the menu system.
Note: The module will return to the conditions on entry.

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4.1.6 Menu 6 –Sensor selection
4.1.7
4.1.8
4.1.9
4.1.7 Menu 7
Warning
Customer adjustment of this setting is not permitted. The module will be
factory set prior to shipment at “0”. Changing this value may limit the
performance and, in extreme cases, the instrument may no longer detect
gas.
4.1.8 Menu 8 - Diagnostics
This feature is a view-only feature. No configuration changes are possible from
within this menu.
•Press the MENU button to open the menu system.
•Using the NEXT and PREVIOUS buttons select menu option:
E:8
•Press ENTER.
•The display will alternate between the current value and
diagnostic code E:8x: where x is:
0 Sensor signal, A to D counts low ppm range.
1 Sensor signal, A to D counts high ppm range.
2 Sensor signal, A to D counts %vol range.
3 Firmware version.
•The diagnostic code can be selected by pressing the UP button.
•Press MENU to return the instrument to its standard mode of
operation.
Warning
The Gasenz is supplied configured for the Sensor type with which it is
to be used.
Customer adjustment of this setting is not permitted.
Adjusting this setting will render the Gasenz inoperable.

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4.1.9 Menu 9 - Restore
4.1.10 Menu 10 –Zero offset
Customer adjustment of this setting is not permitted.
Customer adjustment of this setting is not permitted.