PST PST-UM-2010-EN-02 User manual

Minox i Oxygen Transmitter
User Manual PST-UM-2010-EN-02
PST-UM-2010-EN-02

Minox i Oxygen Transmitter User Manual
ii ProcessSensing.com
Minox i Oxygen Transmitter
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reproduced, communicated to third parties, nor stored in any Data Processing System without the
express written authorization of Process Sensing Technologies.
©2022 Process Sensing Technologies
Issue No. Description Date Author Initials
01 Original document issued 03/2022 CdF
02 Re-brand template applied 08/2022 IMcC

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Before using your Minox i
Safety information
Please read this manual, ensuring that you fully understand the content before attempting to
install, maintain or use the Minox i. Important safety information is highlighted throughout this
document as follows:
The caution symbol indicates instructions that must be followed to avoid damage to
equipment (hardware and/or software) or the occurrence of a system failure.
NOTE highlights an essential operating procedure, condition, or statement.
Abbreviations
The warning symbol indicates instructions that must
be followed to avoid minor, serious or even fatal injury to
personnel.
AC Alternating current
DC Direct current
°C Degrees celcius
°F Degrees fahrenheit
EC Electrochemical
g Grams
GND Ground
kg Kilogram
LED Light emitting diode
LPM Liters per minute
mA Milliampere
oz Ounces
PC Personal computer
PCB Printed circuit board
PLC Programmable logic controller
PPM Parts per million
SCFH Standard cubic feet per hour
S-S Solid-state
SS Stainless steel

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Contents
Before using your Minox i ...............................................................................................iii
Safety information ....................................................................................................................................iii
Abbreviations ..............................................................................................................................................iii
1 Introduction to Minox i ...................................................................................................1
1.1 Overview .................................................................................................................................................1
1.2 Structure .................................................................................................................................................2
1.3 Sensors ....................................................................................................................................................3
1.3.1 Electrochemical (EC) ................................................................................................................................. 3
1.3.2 Solid-state (S-S) .......................................................................................................................................... 3
1.4 Applications ..........................................................................................................................................3
2 Installation .........................................................................................................................4
2.1 Unpack the Minox i ............................................................................................................................4
2.2 Connect Minox i ..................................................................................................................................5
2.2.1 KF-40 flange and tri-clamp process connections with dimensions ....................................... 5
2.2.2 Flow-through process connection with dimensions .................................................................... 6
2.2.3 Electrical connection ................................................................................................................................ 7
3 Calibration ......................................................................................................................... 8
3.1 In-situ ......................................................................................................................................................8
3.1.1 Minox i 100 (ppm) / 200 (%) 8
3.2 Air calibration .................................................................................................................................... 10
4 Maintenance ....................................................................................................................11
4.1 General ................................................................................................................................................. 11
4.2 Replace the sensor .......................................................................................................................... 11
4.3 Check your Minox i ......................................................................................................................... 12
5 Appendices ...................................................................................................................... 13
Appendix A - Technical Specifications ............................................................................................ 13
Appendix B - Hazardous area certification..................................................................................... 14
Appendix C - Quality, recycling and warranty information .................................................... 15

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Minox i Oxygen Transmitter User Manual
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1 Introduction to Minox i
This manual is applicable to Minox i oxygen transmitter with electrochemical (EC) or solid-state
(S-S) sensors; and KF-40 flange, flow-through or tri-clamp connections.
1.1 Overview
ATEX, IECEx and UKCA certified, the Minox i is an intrinsically safe, 2-wire, loop-powered trans-
mitter, with a 4...20mA output. It is designed with proven sensor technology to accurately
measure O₂ in a variety of gases, in the most demanding applications and hazardous environ-
ments.
Minox i is available with the three process connections shown below.
NOTE: You must provide suitable mating flange and clamp for KF-40 and tri-clamp
connections.
Figure 1. Three process connections for Minox i
Minox i can be used with a Programmable Logic Controller (PLC) or suitable equipment capable
of providing a 4...20 mA loop-power interface. For operation in hazardous Ex-rated areas, the
interface must be provided via a suitable isolation barrier device.
The Minox i oxygen transmitter must only be operated in the way set out in this user man-
ual. Always verify electrical interface circuit compatibility before connection.
KF-40 flange Flow-through Tri-clamp

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1.2 Structure
The Minox i oxygen transmitter consists of an oxygen sensor and inbuilt microprocessor. They
are encased in stainless steel, with a process connection on the removable housing and an elec-
trical signal connector on the main housing.
The sensor is replaceable and can be accessed via the removable housing,
as shown in Figure 2:
Figure 2. Structure of Minox i with EC sensor (KF-40 flange pictured)
1.3 Sensors
1.3.1 Electrochemical (EC)
The Minox i EC oxygen sensor is a galvanic fuel cell capable of superior performance, accuracy,
and stability. Its operational life is typically up to 24 months in ambient air.
The sensor is designed to be unaffected by the presence of other background gases or hydro-
carbons, and the XLT variant is compatible with acid gases including pure carbon dioxide.
1.3.2 Solid-state (S-S)
The Minox i S-S sensor can operate with or without sample flow, making it ideal for in-situ mon-
itoring. The result is a linear output transmitter with a sensitivity that is constant throughout its
operating range.
It responds to the presence of electrons in its circuit by converting them to data, and reconvert-
ing them in an electrochemical reaction. This sensor has a life expectancy of up to three years
with normal operation.
Removable housing
Oxygen sensor
Main housing
Electrical signal connector

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1.4 Applications
Typically, the intrinsically safe Minox i oxygen transmitter can be used in the following applica-
tions:
• Inerting
• Glove box purge and containment solutions
• Sieving and powder transfer systems (PTS)
• Additive manufacturing
• Hydrogen generation
• Nitrogen generation
• Biogas and biomethane
• Pharmaceutical.

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2 Installation
Before installing your Minox i oxygen transmitter, ensure that its specifications are suitable for
the process or pipeline where it will be installed.
See "2.2.1 KF-40 flange and tri-clamp process connections with dimensions" on page 5 or "2.2.2
Flow-through process connection with dimensions" on page 6 for more guidance.
This product is not approved for use in applications where the sample gas is greater than
21 % volume O2.
2.1 Unpack the Minox i
NOTE The sensor is packed in a low O2 environment to preserve shelf life. It should not be
removed from its bag until you are ready to use it.
Your Minox i oxygen transmitter pack is comprised of the following equipment:
1. Minox i oxygen transmitter
2. Electrochemical or solid-state oxygen sensor
3. A MagTip calibration tool
4. Certificate of calibration
5. Cable fitted with M12 connector.
Figure 3. Contents of Minox i package
Leaving a sensor in ambient air conditions will reduce sensor life.
123
4
5

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2.2 Connect Minox i
The Minox i oxygen transmitter is factory calibrated and will be ready to use when you unpack
it.
The oxygen transmitter operates from a two-wire industry-standard 4...20 mA loop-powered
supply, which you must be provide.
For flow-through connection, continue to "2.2.2 Flow-through process connection with dimen-
sions" on page 6.
2.2.1 KF-40 flange and tri-clamp process connections with dimensions
A suitable mating flange and seal/centering ringwill be required to install the KF-40 flange or
tri-clamp Minox i. These are not included in the pack.
Figure 4. Technical drawing of KF-40 flange and tri-clamp process connections
1. Place the seal/centering ring on the pipe where the Minox i will be installed.
2. Put the process connection end of the Minox i into the pipe.
3. Place your flange clamp or tri-clamp over the seal/centering ring and the Minox i where
they meet the pipe.
4. Fasten the flange or tri-clamp until finger-tight.
5. Continue to "2.2.3 Electrical connection" on page 7.
Electrical signal connector
KF-40 vacuum
flange fitting
Flange clamp
Seal/centering ring
53*
KF-40 base and pipe T-piece
*Height to suit depth of sensor
59
55
118.4
Ø37
39
54.8
47.7
10
BSPP 1/8 threaded
Dimensions are in mm unless otherwise stated.

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2.2.2 Flow-through process connection with dimensions
The flow-through Minox i can handle a fixed pressure of up to 2 barg, maintaining the correct
gas flow to the sensor. This eliminates the need for pumps or extractive sample systems.
Figure 5. Technical drawing of flow-through process connection
1. Align the flow-through Minox i 1/8” NPT with your pipe fitting.
2. Fasten screws to adapt to pipe fitting.
38
45.1
59
1/8” NPT 47 1/8 “ NPT
End elevation rotated 90o
Electrical signal connector

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2.2.3 Electrical connection
Figure 6. Typical connection cable wiring
The Minox i oxygen transmitter operates using a 2-wire industry-standard 4...20 mA loop-pow-
ered supply which you must provide.
Once the Minox i is connected to your process, it is ready to be connected to your power sup-
ply. To do this:
1. Align the pins in the Minox i electrical signal connector with the M12 mating connector on
the cable.
The cable connector can then be gently pushed into place.
2. Rotate the fastener clockwise until finger tight. Your Minox i oxygen transmitter is now
connected. A pulsing red LED will indicate it is operating correctly.
A suitable galvanic isolation barrier is required if the Minox
i is located in an Ex area.
Consult the EC-type examination certificate Baseefa19atex0200
for Parameter Matching.
Pin
1
2
3
4
Function
+24 V DC (loop in)
-VE (loop out signal)
No connection
No connection
Brown
White
#Blue
#Black
+24 V
Loop
sensing
element
0 V
Suitable isolation
barrier Suitable
PLC / loop supply
++
--
NOTE:
1. The above equipment to be supplied by
2. A suitable 4...20 mA loop-power source/
measurement circuit is required.
A typical representation is shown above.
I.S.
output
non
output
I.S.
# Additional cores/colors available
when standard 4-core cable supplied
with the Minox i
customer.
M12 connector on Minox i
1
2
Minox i
Cable (right-angled or straight)
with M12 mating connector

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3 Calibration
NOTE: Calibration should be carried out by an appropriately trained or suitably qualified per-
son.
The oxygen sensor output will decrease over time, and periodic calibration will be required. This
is a non-intrusive procedure, achieved by using the MagTip one-touch calibration tool included
with your Minox i.
Calibration cycles for the Minox i depend on the application, the applied gases, and the sensor
type. They can be carried out in-situ or after safely removing the oxygen transmitter from your
process in a bench test.
NOTE: For optimal calibration, the atmosphere surrounding the sensor must be ambient air
(20.9 % volume O2) with no contaminants present. This can be achieved using an oxygen ana-
lyzer or by flushing the system with clean, oil-free compressed air.
The Minox i 100 (ppm) must be calibrated in a controlled environment. Calibrating the
Minox i 100 in ambient air will significantly reduce sensor life.
When the MagTip tool is applied, the indicator LED will flash six times in rapid succession. This
confirms calibration is in progress.
During normal operation, the indicator LED will flash once every two seconds. This slower flash
confirms Minox i is powered up and operational.
3.1 In-situ
3.1.1 Minox i 100 (ppm) / 200 (%)
Please see above before proceeding.
1. Apply the calibration gas (20.9 % volume O2) for a minimum of 15 minutes.
The pressure flow should replicate that applied to the Minox i during normal operation.

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This will ensure calibration is accurate, and avoid over-pressurizing the oxygen sensor.
Figure 7. Calibration for Minox i %
2. Allow one to two minutes for the output to stabilize (i.e reach its ambient air concentration
value and remain at the value). An independent portable oxygen analyzer can be used to
check this.
3. Observe the O2 concentration on your oxygen analyzer display. It should read 20.9 %
volume O2.
4. Place the MagTip on the Minox i main housing, adjacent to the red indicator LED, as shown
in Figure 8 below.
The indicator LED will begin to flash rapidly.
Figure 8. Minox i with MagTip calibration tool
5. When calibration is complete, the indicator LED will resume flashing at a steady pulse.
For the standard 0...25 % O2 range, the 4...20 mA output will be automatically adjusted to
17.376 mA.
O
²
To customer control
system interface
Cylinder oxygen (20.9%)
or ambient air
Typical in-situ pipeline
calibration application
Electrical signal cable
Indicator LED
MagTip calibration tool

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This value, or the reading 20.9%, must be observed to confirm calibration is complete.
When calibration is complete, the Minox i LED will resume flashing at a steady pulse.
3.2 Air calibration
The following method of air calibration should only be performed on a Minox i 200 (containing
a % sensor).
Figure 9. Minox i indicator LED
1. Unfasten and remove the Minox i from your process, and leave it in an ambient air environ-
ment.
Ensure the environment has normal oxygen concentration, an independent portable oxy-
gen analyzer can be used to check this.
2. Observe the O2 concentration on your oxygen analyzer display. When the concentration
has stabilized it should read 20.9 % volume O2.
This usually takes between five and ten minutes.
3. Place the MagTip on the Minox i main housing, adjacent to the indicator LED, as shown in
Figure 8. The red indicator LED will begin to flash rapidly.
4. When calibration is complete, the indicator LED will resume flashing at a steady pulse.
5. Re-install your Minox i following the instructions "2.2.1 KF-40 flange and tri-clamp process
connections with dimensions" on page 5 or "2.2.2 Flow-through process connection with
dimensions" on page 6, depending on your process connection.

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4 Maintenance
4.1 General
To maintain performance, the sensor in Minox i will require replacement. Please check the Tech-
nical Specifications for frequency. During sensor replacement, it is recommended that light
cleaning of the external housing is carried out, as well as the checks outlined in this section.
Never use chemical cleaning agents or high pressure water or steam to clean the equip-
ment. Do not submerge in water.
4.2 Replace the sensor
The Minox i oxygen sensor is replaceable. When it reaches the end of serviceable life, calibra-
tion can no longer be performed and the sensor must be replaced.
A regular program of calibration will mitigate against sudden sensor failure. It is advisable to
establish a program of preventative maintenance to ensure process downtime is kept to a min-
imum or avoided.
To replace your sensor:
1. Unscrew the removable housing from the main housing of Minox i by turning it clockwise.
The sensor will be located in the removable housing, as shown.
2. Gently tip the sensor out of the removable housing into your hand or onto a soft surface.
Figure 10. Oxygen sensor placement in removable housing
3. Place your new EC or S-S oxygen sensor into the removable housing, ensuring the sensor’s
brass rings are facing out of the removable housing as shown in Figure 10.
4. Screw the removable housing back onto the main housing, by turning it counter-clockwise.
NOTE: The brass slip rings on the sensor must face into the main housing and out of the
removable housing as shown above.

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4.3 Check your Minox i
The following checks will ensure your Minox i oxygen transmitter is operating as its optimum.
• Check for any damage to the connecting cable
• Depending on process conditions and location, check the gas entry orifice at the face-end
of the Minox i.
This is to ensure there is no build-up of particulate matter, and that moisture is not being
retained at the orifice.
Typically, the Minox i will require removal from the process to carry out checks, cleaning and
sensor replacement.

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5 Appendices
Appendix A - Technical Specifications
Sensor
Solid-state Electrochemical
(%)
Electrochemical
(PSR)
Electrochemical
(XLT)
Model OC-92 OC-90PSR-12-233-H XLT-12-123
Operating temperature -20 °C…+50 °C
(-4 °F…+122 °F)
-20 °C…+45 °C
(-4 °F…+113 °F)
+5 °C…+45 °C
(+31 °F…+113 °F)
-10 °C…+45 °C
(+14 °F…+113 °F)
Sensor life (in original
packaging)
Up to 3 years 2 years < 1,000 ppm O2 @ 25 °C (77 °F) and atmospheric pressure
Calibration interval Up to 1 year Up to 6 months Up to 3 months
Gas-wetted materials Acetal, Stycast 2651 mm,
stainless steel, PTFE, FR4
and gold
HDPVDF, ABS, Teflon,
FR4 and gold
HDPVDF, stainless steel, Teflon, FR4 and gold
Performance
Measuring range 0…1, 0…5, 0…25 % O20…25% O20…10, 0…1000 ppmV O2
Output resolution 0.01 % O21 ppmV O2
LDL (sensitivity) 0.05 % O2 (500 ppm) 1 ppmV O2
Accuracy (intrinsic error) +/-2 % of reading @ calibrated temperature and pressure
Linearity +/- 2 % of reading
Response time (T90) < 15 seconds @ 25 °C (77 °F) within selected range
Flow rate 250…500 ml/min (0.5…1.0 SCFH)
Humidity 0…98 %rh non-condensing
Operating pressure Nominally atmospheric (+/-100 mBar)
Electrical input/output
Output signal 4…20 mA
Power supply 24 V DC +/- 10 %
Maximum power consumption 50 mA @ 24 V DC
Electrical interface M12 connector (1.5 metre cable supplied)
Mechanical
Housing material 303 and 316 stainless steel
Gas-wetted materials excluding
sensor
316 stainless steel
O-ring material Nitrile
Ingress protection IP66 (NEMA4)
Weight 800 g (28 oz)

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Appendix B - Hazardous area certification
Area Certification details Standards
Europe & Japan
(Pending)
IECEx / ATEX / UKCA
IECEx BAS 19.0013 / Baseefa 19ATEX0020 /
BAS22UKEX0052
II 1 GD
Ex ia IIC T4 Ga (-20 °C≤Ta≤+55 °C)
Ex ia IIC T200 135°C Da (-20 °C≤Ta≤+55 °C)
Ui=28 V Ii=93 mA Pi=0.65 W Ci=12nF Li=705uH
EN IEC 60079-0:2018
EN 60079-11:2012
IEC 60079-0 Ed. 7 2017
IEC 60079-11 Ed. 6 2011
North America /
Canada
(Pending)
Class I Division 1 Group A-D T4
Class II Division 1 Groups E-G T135°C
Class I Zone 0 AEx ia IIC T4 Ga / Ex ia IIC T4 Ga
Class 1 Zone 20 AEx ia IIC T135°C Da / Ex ia IIC
T135°C Da
Ta = -20°C≤Ta≤+55°C
UI/Vmax=28 V II/Imax=93 mA Pi=0.65 W Ci=12nF
Li=705uH
CSA C22.2 No. 60079-0:19
CSA C22.2 No. 60079-11:14
UL 60079-0:2019
UL 60079-11:2014
CSA C22.2 No. 61010-1-12
(Reference only)