Ntron MICROX Operator's manual

Microx User Manual
Issue Date:
19/03/2019
F/W Ver.:
V233P
The
User Instruction Manual
Oxygen Analyser
Rev.: 1.2
Part Number.: 05-670

Microx User Manual
1Introduction ................................................................................5
1.1 MICROX MODULE ................................................................ 5
1.2 OPERATION...........................................................................
1.3 SENSOR INPUTS .................................................................. 6
2Specification...............................................................................7
3MICROX Module.........................................................................8
3.1 FUSES................................................................................. 8
3.2 MOUNTING OPTIONS............................................................ 8
3.3 FIELD CONNECTIONS........................................................... 9
3.4 RECOMMENDED SAMPLING SYSTEM PIPING #1.................. 12
(FOR STUB TUBE TYPE SENSOR CONNECTION)...................... 12
3.5 RECOMMENDED SAMPLING SYSTEM PIPING #2........................ 13
3.6 RS232 CONNECTIONS.......................................................... 14
3.7 ANALOGUE OUTPUT........................................................... 14
4Software Features....................................................................15
4.1 PASSWORD....................................................................... 15
4.2 MENU OPTIONS AND PASSWORD ASSIGNMENTS................... 16
4.2.1 Menu 1 –Calibrate sensor ....................................... 18
4.2.2 Menu 2 –Analogue output FSD............................... 19
4.2.3 Menu 3 –Set 4 mA output........................................ 19
4.2.4 Menu 4 –Set 20 mA output...................................... 20
4.2.5 Menu 5 –Analogue Output Simulation................... 20
4.2.6 Menu 6 –Factory Restore ........................................ 21
4.2.7 No Function............................................................... 22
4.2.8 Menu 8 - Diagnostics................................................ 22
4.2.9 Menu 9 –Factory Only.............................................. 23
4.2.10 Menu 10 –Zero offset............................................... 23
4.2.11 Menu 11 –PPM sensor Gain.................................... 24
4.2.12 Menu 12 –% vol sensor gain................................... 25
4.2.13 Menu 13 –Sensor damping ..................................... 26
4.2.14 Menu 14 –New sensor data..................................... 26
4.2.15 Menu 15 –Electronics zero...................................... 27
4.2.16 Menu 16 –Noise Rejection....................................... 28
4.2.17 Menu 17 –Relay........................................................ 29
4.2.18 Menu 18 –Alarm levels ............................................ 30
4.2.19 Menu 19 –Alarm hysteresis..................................... 30
4.2.20 Menu 20...................................................................... 31

Microx User Manual
5Routine Maintenance & Servicing..........................................32
5.1 ROUTINE INSPECTION AND MAINTENANCE .......................... 32
Before turning on power to the Analyser
and Sensor, ensure that the voltage is
correct. See the specification section of
this manual for details.
The DIN Rail Mounting Microx Analyser module
and Sensor operate with an Extra Low Voltage
power source.(ELV)
No special personnel protective measures are
necessary but it must be ensured that the user
connects a suitable power source to the Microx
Analyser within the voltage range specified for
this product.
The Panel and Wall mount versions can be
mains powered (110-240VAC) option at time of
order.
The user should ensure that any installation and
wiring and upstream protective devices are
provided in line with the appropriate regulatory
requirements.
Zirconia Sensors operate at moderately
elevated temperatures and can cause
minor discomfort if held in contact with
fingers or hands for a number of
seconds.

Microx User Manual
Revision Summary
•Implemented Password System (E:20)
•Implemented Factory Restore Function (E:6)
•Implemented View Serial Number facility in
Software via Menu E:8.

Microx User Manual
Rev. 1.2
V233P
Page 5
1 INTRODUCTION
1.1 Microx Module
The MICROX Module has been designed to allow OEM’S (Original Equipment
Manufacturers) to use the module within their own equipment. Typically, the
DIN and Panel Mount Microx Analyser would be mounted within a control
panel with the sensor connected to the process sample point either within the
panel or external to the panel. The Wall Mount version is suitable for mounting
in the operational location without further mechanical protection, following a
suitable risk survey being undertaken by the user.
Key design features are:
•Compact enclosure
•Simple keypad calibration facility (utilising onboard LCD display).
•4-20mA current source output for gas level indication (10-bit
resolution).
•Input voltage range, 24VDC Nominal
or 110-240 VAC. (Panel and Wall mount versions)
•PCB mounted screw terminals for all connections.
•RS232 output for transmission of live data to a PC.
3.1 Operation
When power is first applied to the Microx module 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 module is now operational

Microx User Manual
Rev. 1.2
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Page 6
1.2 Sensor Inputs
The Microx Module is designed to interface with any one of the following 3
principal types of sensor technology.
Electro-Chemical
Solid State
Zirconia Dioxide
A number of different measurement ranges are possible as follows;
0-1000 ppm O2
0-10000 ppm O2
0-25% Vol. O2
0-96% vol. O2
The above list represents standard ranges. Other measurement ranges are
possible.

Microx User Manual
Rev. 1.2
V233P
Page 7
2 SPECIFICATION
Supply
Input Voltage
Options:
24V DC nominal.(Good quality power supply)
110-240VAC Panel and Wall mount versions only.
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)
Current Source.
Relays (Optional)
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
Dimensions:
See the appropriate diagram on page 7 this
manual.
IP Rating
IP20. Wall mount version is IP65.
Terminals
capacities:
0.2-4.0mm Solid wire
0.2-2.5mm Stranded wire
Software:
Software configuration, calibration and data
logging provided by PC communications.
RS232 Output
Communications with PC @ 19200 baud.

Microx User Manual
Rev. 1.2
V233P
Page 8
3 MICROX MODULE
3.2 Fuses
A 500mA Anti-surge fuse is fitted to the OEM module, which is connected
between the power supply and the OEM module. It is located next to the
power input terminals.
3.3 Mounting Options
Din Rail Mounting Version.
Overall dimensions:
86mm(H) x 69mm(W) x
58mm(D).
Panel Mounting Version.
Overall dimensions:
96mm(H) x 96mm(W) x
83mm(D).
(including connection Terminals)
Panel cut-out dimensions
91mm(H) x 91mm(W)
Wall Mounting Version
Overall dimensions:
145mm(H) x 110mm(W) x 93mm(D).
(including Cable Glands)

Microx User Manual
Rev. 1.2
V233P
Page 9
3.4 Field Connections
All connections to the module are provided in the form of screw terminals.
The pin- outs for each Microx version are given below.
Din Rail Mounting version.
View ‘A’
Note:Terminals 1,2 & 3 are for the connection of Electro-Chemical %
and Zirconia % or ppm Sensors.
Terminals 4 & 5 are for the connection of Electro-Chemical ppm
Sensors only. See Sensor for connection details. For Zirconia
Sensors, connect the sensor power wires (+ & -) into terminals 14 and
13 of the Analyser along with the Analyser power wiring.
Electrical Interface
Terminals/connections as per view ‘A’

Microx User Manual
Rev. 1.2
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Page 10
Panel and Wall Mount Versions - DC Supply option.
(Terminals located at the rear of the Module, identified as below
as viewed)
View ‘A’
Note:Terminals 1,2 & 3 are for the connection of Electro-Chemical %
and Zirconia % or ppm Sensors.
Terminals 4 & 5 are for the connection of Electro-Chemical ppm Sensors
only. See Sensor for connection details. For Zirconia Sensors, connect
the sensor power wires (+ & -) into terminals 14 and 13 of the Analyser
along with the Analyser power wiring.
Electrical Interface
Terminals/connections as per view ‘A’
No Connection
Supply by Customer
0V
24V
Note: Additional Terminals fitted on Wall
Mount DC version with Zirconia Sensor.

Microx User Manual
Rev. 1.2
V233P
Page 11
Panel and Wall Mount Versions - AC Supply option.
(Terminals located at the rear of the Module, identified as below
as viewed)
View ‘A’
Note:Terminals 1,2 & 3 are for the connection of Electro-Chemical
% and Zirconia % or ppm Sensors.
Terminals 4 & 5 are for the connection of Electro-Chemical ppm
Sensors only. See Sensor for connection details. For Zirconia
Sensors, connect the sensor power wires (+ & -) into terminals 14
and 13 of the Analyser.
Mains Input
Terminals
85-264VAC
Electrical Interface
Terminals/connections as per
view ‘A’

Microx User Manual
Rev. 1.2
V233P
Page 12
3.4 Recommended Sampling System Piping #1
(for stub tube type Sensor connection)
Sample Input
For Electrochemical &
Zirconia Sensors, set
Flow Restrictor to
achieve a flow rate of
250ml/m.
Regulator set to 5
PSIG Max.
‘Tee’ connection.
(Ntron supplied)
Ensure correct
orientation as
shown.
Optional Isolation
Valve for PPM
Sensors, Hand or
Solenoid operated
Internal
‘T’ piece
Flow
Restrictor
Attach a suitable
length of piping
for the exhaust
as illustrated.
Sensor
Sample
Exhaust
‘T’
Fitti

Microx User Manual
Rev. 1.2
V233P
Page 13
3.5 Recommended Sampling System Piping #2
(for flow-through type Sensor connection)
Regulator set to 5
PSIG Max.
For Electrochemical &
Zirconia Sensors, set
Flow Restrictor to
achieve a flow rate of
250ml/m.
Optional
Isolation Valve
for PPM
Sensors, Hand
or Solenoid
operated
Optional Isolation
Valve for PPM
Sensors, Hand or
Solenoid operated
Sample
Exhaust
Flow
Restrictor
Attach a suitable
length of piping
for the exhaust
as illustrated.
Sample Input

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Rev. 1.2
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Page 14
3.6 RS232 connections
Contact Ntron for details if required.
3.7 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.

Microx User Manual
Rev. 1.2
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Page 15
4 SOFTWARE FEATURES
The menu system featured within the Microx module allows all calibration and
configuration activities to be performed.
Note: It is important that that the Microx module is correctly configured
for the sensor in use, prior to performing any feature available in
the menu system.
A B C D
The keypad has the following functionality:
Button
Function
Alternate Function
A
Menu Open/Close
B
Enter
Numerical value 1
C
Next (Increment)
Numerical value 2
D
Previous (Decrement)
Numerical value 3
4.1 Password
The Microx module uses a password system to restrict the end user from
carrying out certain changes that may compromise the use of the equipment.
The Password feature may be Enabled or disabled.
Menu access is organised in three levels, 1, 2 and 3.
Each of the three menu levels allows access to specific menu options within
the menu system.
When a particular menu level is accessed, the user has 10 seconds to enter a
specific menu within that level otherwise the menu level is automatically
exited. Once a menu is entered, the user then has a duration of 10 minutes
within that menu to make adjustments. When the adjustment is made, the
menu is exited to save the adjusted setting to the analyser memory.
20.9

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Page 16
The menu structure and Password system is explained on the following
pages.
4.2 Menu options and password assignments
Menu option
Function
E:1
Calibrate Sensor
E:2
Analogue output FSD
E:3
Set 4 mA
E:4
Set 20 mA
E:5
Analogue Output Simulation
E:6
Factory Restore
E:8
Diagnostics
E:9*
Sensor type. (Factory Only)
E:10**
Zero Offset (ppm Sensor only)*
E:11
PPM Sensor Gain
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
E:20
Password Enable/Disable
To access the Menus, first press the MENU button on the Analyser keypad.
The Analyser display will show the word PASS. Enter the Password
depending on the menu access required. The numerical Passwords are to be
entered by using the keypad buttons as identified on the previous page.
(e.g. for numerical password 1331, press button ‘B’ then button ‘D’ twice, then
button ‘B’ again.) (Note! At each press of the relevant button, ‘Po’ is displayed
on the screen, not the number value being entered)
Next, press the MENU button again and press the UP arrow button to
advance through the menu levels.
Note! For access to the Level 1 menus, no password entry is required.
*This Menu is protected by an additional factory Password and is not for use by the
end user.
**This Menu is only visible when certain sensor types are fitted.

Microx User Manual
Rev. 1.2
V233P
Page 17
Password Structure
`
Level 1
Level 2
Level 3
Password
Password
Password
None
1331
12231
Menu
Menu
Menu
E:1
E:2
E:3
E:3
E:4
E:4
E:5
E:5
E:5
E:6
E:8
E:8
E:8
E:9*
E:10**
E:11
E:12
E:13
E:14
E:15
E:16
E:17
E:17
E:17
E:18
E:18
E:18
E:19
E:19
E:19
E:20
MENU
MENU
MENU
MENU
MENU
MENU

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Rev. 1.2
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Page 18
4.2.1 Menu 1 –Calibrate sensor
•Press the MENU button to open the menu system.
•Using the NEXT and PREVIOUS buttons select menu option:
E:1
•Press ENTER.
•Apply a known concentration of gas (applicable to sensor type)
at a flow rate of between 100 to 500 ml/m. Allow time for the
sensor to respond. (see diagram on page 8)
•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.
•Turn off and disconnect the calibration gas.
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.
*E:9-Password protected, Factory only; **E:10-visibilty according to sensor type.
Important!
Electro-Chemical Sensors.
For ppm configured modules that have been fitted with a
replacement sensor the “Zero Offset” (Menu 10) must be
entered prior to a calibration.

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Rev. 1.2
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Page 19
4.2.2 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.
4.2.3 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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Rev. 1.2
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Page 20
4.2.4 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.
4.2.5 Menu 5 –Analogue Output Simulation
The Microx 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.