Mipex MIPEX-02 User manual

www.mipex-tech.com
ESAT.100200.00.06 UM
September 23, 2021
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SMALL-SIZE INFRARED GAS SENSOR
MIPEX-02-X-RX-X.1 G
Non EX version
USER MANUAL
ESAT.100200.00.06 UM

USER MANUAL
SMALL-SIZE INFRARED GAS SENSOR MIPEX-02-X-RX-X.1 G
ESAT.100200.00.06 UM
September 23, 2021
Page 2 of 43
THE SOLE PROPERTY OF SIA MIPEX. ANY REPRODUCTION WITHOUT THE WRITTEN PERMISSION OF SIA MIPEX IS PROHIBITED.
INFORMATION CONTAINED IN THIS DOCUMENT IS THE SOLE PROPERTY OF SIA MIPEX.
ANY REPRODUCTION IN PARTS OR AS A WHOLE WITHOUT THE WRITTEN PERMISSION OF
SIA MIPEX IS PROHIBITED.
Document revisions
Rev.
Date
Common changes
06
September
23, 2021
Change of software version to 25.8.
Adding information to Appendix C.1
05
November 06,
2020
Changing the description of the sensor and measurement range of
hydrocarbon gases.
04
September
29, 2020
Removal from the document of CO2 sensor with stainless steel type of
housings.
Introduction of non-safety design.
03
September
3rd, 2020
Adding to the document CO2 sensor, with stainless steel type of housings.
Changed fig.9 and fig.10.
02
August 21th,
2018
Corrected operation temperature range lower limit from -55 °C to -40 °C
(see. Table 2).
Removed description of firmware revision 25.67 (see Appendix C).
Corrected description of <CCS>, <CFS>, <CKS> and <INIT> commands
(see Appendix C.2.1, Appendix C.2.4).
01
February 08th,
2018
Released version.

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Table of contents
1. Introduction ............................................................................................................................... 4
1.1. List of abbreviations .......................................................................................................... 4
1.2. List of terms ....................................................................................................................... 4
2. Description ................................................................................................................................ 5
3. Technical specifications .......................................................................................................... 6
4. Handling precautions ............................................................................................................... 8
5. Installation and service ............................................................................................................ 9
5.1. Preparation ........................................................................................................................ 9
5.2. Mounting ............................................................................................................................ 9
5.3. Electrical conditions ......................................................................................................... 10
5.4. Getting started ................................................................................................................. 13
5.5. Connecting multiple sensors to single UART line ........................................................... 13
6. Storage and transportation .................................................................................................... 15
7. Warranty .................................................................................................................................. 16
8. Contacts .................................................................................................................................. 17
Appendix A. Sensor types and characteristics ....................................................................... 18
Appendix B. Connection diagram ............................................................................................. 25
Appendix C. UART communication protocol ........................................................................... 26
Appendix C.1. General information ........................................................................................ 26
Appendix C.2. Communication protocol commands .............................................................. 27
Appendix C.2.1. Commands for requesting measured data .......................................... 28
Appendix C.2.2. Commands for controlling operating mode .......................................... 31
Appendix C.2.3. Commands for requesting factory settings and properties .................. 31
Appendix C.2.4. Commands for sensor configuring and span calibrating ..................... 32
Appendix C.2.5. Commands for configuring net address ............................................... 35
Appendix D. Sensor configuration ........................................................................................... 36
Appendix D.1. Zeroing and span calibration .......................................................................... 36
Appendix D.2. Temperature dependence of zero adjustment ................................................ 39
Appendix E. Dust filter attaching .............................................................................................. 40
Appendix F. Troubleshooting ................................................................................................... 41

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1. INTRODUCTION
This user manual (UM) is intended to describe design and operation of small-sized gas sensor
MIPEX-02-X-RX-X.1 G (hereinafter MIPEX-02 or sensor). UM contains basic technical data,
recommendations and other information necessary for proper operation, maintenance and storage
of sensor.
SIA MIPEX reserves the right to make changes to this manual.
1.1. List of abbreviations
• ADC – Analog-to-Digital Converter.
• LEL – Lower Explosive Limit.
• LED – Light Emitting Diode.
• CGM – Control Gas Mixture.
• NDIR – Non-Dispersive Infra-Red.
• UART – Universal Asynchronous Receiver/Transmitter.
• CRC – Cyclic Redundancy Check.
• IP – Ingress Protection.
• ASCII – American Standard Code for Information Interchange.
• Hex – hexadecimal.
1.2. List of terms
• Target gas is a gas, which sensor is intended to detect and measure its concentration.
• Calibration gas refers to CGM containing that gas, used for sensor calibration.
Any command stated in this UM as <X>, where X stands for a command text consisted of any
number of characters, must be read and/or sent without the symbols “<” and “>”.

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2. DESCRIPTION
MIPEX-02 sensor is a small-size, ultra-low power consumption gas sensor that operates on
the NDIR (non-dispersive infrared radiation) principle to detect and determine the concentration of
hydrocarbon gases (methane - CH4 and propane - C3H8) in atmosphere
non-hazardous.areas. The sensor is used as a OEM component for portable and fixed gas detectors.
Has a long life time. The sensor's ultra-low power consumption allows it to be used in battery-
powered systems, including IoT applications.
Sensor has several modifications for specific needs. They differ by housing types, photodiode
and LED, calibration gases, interface types, measuring ranges etc. (see Appendix A).
Sensor is a smart integrated system and includes mirror optical system, photodiode and LED,
signal amplifiers, microcontroller, current driver of the infrared LED, UART interface signal generator
and supply forming voltage unit. Sensor microcontroller performs storage of unique sensor
calibration constants, processing of measurement results and concentration of measured gas, and
information exchange.
Sensor operating principle is based on NDIR technology, i.e. on selective infrared radiation
absorption by gas molecules.
Differential dual wavelength method allows eliminating of water vapor, optical elements
contamination and other non-selective hindrances influence.
Target gases available for MIPEX-02 are listed in Table 1.
Table 1. Target gases for MIPEX-02 sensors
Target gas
Analytical tasks
description
Optical elements
code (see
Appendix A)
Spectral
characteristic
maximum
Notes
CH4
Analyzing a gas mixture
containing methane as
the main component.
1
3.31 µm
For optical elements
sensitivity to other
hydrocarbons, see
Fig. 7.
C3H8
Analyzing a gas mixture
containing heavy hydro-
carbons. The presence
of methane is negligible.
2
3.4 µm
For optical elements
sensitivity to other
hydrocarbons, see
Fig. 8.

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3. TECHNICAL SPECIFICATIONS
Table 2. General specifications (for available options see Appendix A)
Gas sampling method
Diffusion
Operating principle
Non-Dispersive Infra-Red (NDIR)
Target gas1
CH4
C3H8
Operating,
storage and
transportation
conditions:
Relative humidity, %
up to 98
Atmospheric pressure, kPa
80…120
Temperature2, °C
-55...+60
Temperature range, °C
-10…+40
-40…+60
-20…+50
Overall dimensions, mm
⌀20.3×16.6
(without pins; housing types “1”)3
⌀22×16.6 (without pins; housing type “2”)
Pins length, mm
4.6
Warm-up time, sec
≤ 120
Weight, g
16.6 (housing type “1”)
15.5 (housing type “2”)
Housing material
Stainless steel
Life time expectancy4 (not less than), years
10
Shelf life time (not less than), years
8
IP rating
20 (without dust filter)
54 (if a dust filter provided by SIA MIPEX is applied)
1
See Appendix A for details.
2
Term “operating temperature” refers to ambient temperature, at which sensor operates, but its readings
variability stated in Table 3 is provided only in specified temperature range (see Table 5 and Table 6).
3
For information on housing types, see Appendix A.
4
To provide metrological properties during sensor lifetime, zeroing and span calibration should be
performed periodically, at least once in 30 months (see Appendix D.1).

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Table 3. Measurement specifications
Measurement range, % vol.
0…1.5 (C3H8 sensors)
0…2.5 (CH4 sensors)
Basic variability (+20…+25 ⁰C)5
± 0.1% vol. or ± 5% of indication (whichever is greater)
for CH4
± 0.05% vol. or ± 5% of indication (whichever is
greater) for C3H8
Response time (T90) without dust filter, sec
≤ 5 (housing type “2”)
≤ 15 (housing type “1”)
Response time (T90) when dust filter
provided by SIA MIPEX is installed (see
Appendix E), sec
≤ 10 (housing type “2”)
≤ 30 (housing type “1”)
Table 4. Electrical specifications and standards compliance
Operating supply voltage, VDC (min…max)
+3.0…+5.0
Communication interface
UART
Average current, µA
≤#330
Degree of personal protection against
electrical shock caused by sensor
meets the requirement of class III GOST 12.2.007.0-75
5
For variability in the whole operating temperature range for any sensor modification, see Table 6.

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4. HANDLING PRECAUTIONS
Sensor is not explosive protected.
• Do not use damaged sensor. It must be repaired only by personnel authorized by
manufacturer.
• Keep sensor out of contact with aggressive substances e.g. acidic environments, which
can react with metals, as well as solvents, which may affect polymeric materials.
• Diffusion holes of sensor should be protected against ingress of dust and sprayed
materials.
• Sensor is not intended to measure target gas concentration contained in fluids.
• Maximum allowable pressure on the central part of sensor reflecting cover or on sensor
side surface – 2 MPa, on sensor upper edge – 100 MPa.
• Sensor updates information about concentration every 1.28 ± 0.065 second. Sending any
command more often than one time per second (1 Hz) may reduce sensor accuracy.
• Correct measurement is provided when ambient temperature changes not faster than 0.6
°C/min.
• Covering diffusion holes of sensor increases its response time t(90).
• When operating sensor, observe conditions stated in Table 2 and Table 4.
• When dealing with cylinder containing gas mixture under pressure, it is necessary to follow
the safety regulations. Dumping of CGM into the work area is not allowed.
• There is no risk of pollution and negative impact on human health. Sensor does not contain
any harmful substances that may be released during its normal operation.
• The sensor is manufactured in conformity with the declaration
RoHS 2 Compliant Directive 2011/65/EU.
• It is strictly prohibited to remove label from sensor.

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5. INSTALLATION AND SERVICE
• Sensor housing maximum capacitance of ungrounded metal frame equal
17.4 pF.
• Sensor must be mounted using sockets only, as soldering its pins may
damage sensor.
• It is not allowed to use excessive pressure on sensor housing. Maximum
allowable pressure on the central part of sensor reflecting cover or on sensor
side surface – 2 MPa, on sensor upper edge – 100 MPa.
• Span calibration is necessary during sensor’s initial installation into gas
analyzers and during preparation for the equipment checking. Manual zeroing
must be performed after prolonged storage without power supply, after
transportation as well as after dust filter is applied (see Appendix D.1).
• It is required to perform span calibration at least once in 30 months.
5.1. Preparation
• If sensor has been kept in transport containers at temperatures below zero centigrade,
leave it at +10…+35 °C for not less than one hour.
• Remove the packaging. Check presence of the certification markings; make sure there
are no mechanical injuries on sensor surfaces.
5.2. Mounting
It is recommended to use the following sockets or similar for sensor mounting:
• Cambion 450-3729-01-06-00;
• Cambion 450-3704-01-06-00;
• Harwin H3183-05.
Sensor pinout is shown in Appendix A, Table 7.
End user instrument design has to provide that sensor is free of excessive pressure on its
housing, ingress of dust, dirt and condensed moisture, as these factors may affect the accuracy of
measurement. It is recommended to use dust filter (available as an option; see Appendix E). Filter
has to be checked regularly and replaced when fouling is significant.

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5.3. Electrical conditions
• During first 0.01 seconds after power up, sensor consumes up to 55 mA, and
then during 0.1 second average current consumption up to 14 mA (see Fig. 1).
After that sensor switches to the normal current consumption mode.
• During operation, MIPEX-02 has pulsed current consumption. Pulse repetition
period is 80 ± 20% ms (depends on ambient temperature).
• During operation, maximum surge current is 17 mA for 20 microseconds (see
Fig. 2). Average current consumption is not more than 330 µA when UART is
active (see Fig. 3). For power consumption of sensor connected via barrier see
Fig. 4 and Fig. 5.
Sensor power supply with rated output range DC voltage (U0) of +3.0…+5.0 V.
Sensor UART transceiver communication properties are:
• High logic level for transmitting line TxD is in range of +2.4…+2.7 V;
• High logic level for receiving line RxD is in range of +2.4…+3.4 V;
• Low logic level is in range of 0…+0.8 V;
• Maximum output current of UART is not more than 25 mA.
Fig. 1. Typical current consumption waveform after power up

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Fig. 2. Typical current consumption waveform
Fig. 3. Typical current consumption waveform when UART is active (<@> command)

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Fig. 4. Typical barrier voltage drop waveform (3.3 V input)
Fig. 5. Typical current consumption waveform (3.3 V input, R = 30 Ohm, C = 20 µF)

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5.4. Getting started
• During first 40 seconds after the power is up sensor does not return the
measured concentration value (the value is displayed as “-0001”, hex:
“8001”, “-0002”, hex:“8002”, “-0003”, hex:“8003”, see Table 13).
• When the measurement range is exceeded, concentration value is displayed
as “32767” (hex: “7FFF”).
• Sensor updates information about concentration every 1.28 ± 0.065 second.
Sending any command more often than one time per second (1 Hz) may
reduce sensor accuracy.
Switching on/off sensor is performed automatically upon feeding/disconnecting power supply.
After sensor is installed into end-user equipment check its status by sending <DATAE2>
command via UART interface:
• for <DATAE2> command description see Appendix C.2.1;
• for status bytes description and recommendations see Table 12.
Sensor span calibration and zeroing should be performed next. Methods of sensor span
calibration and zeroing are given in Appendix D.1.
5.5. Connecting multiple sensors to single UART line
It is possible to connect to single UART line up to 256 sensors assigning them net addresses
in range 00…FF. Sensor has net address 00 by default. To view and change its net address use the
following commands: <!**>, <NETON>, <NETOFF>, <%AABB>. For commands description see
Appendix C.2.5.
If sensor is used in combination with other devices on single UART line, any command text
must contain sensor’s address prefix as “#AA”, where AA stands for sensor’s net address in
hexadecimal format in range 00…FF. Thus, command text must be sent as <#AAX>, where X stands
for command text containing any number of characters in accordance with sensor communication
protocol (see Appendix C). Connection diagram of multiple sensors to single UART line is shown on
Fig. 6.

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Fig. 6. Connection diagram of multiple sensors to single UART line
Resistors are calculated as follows:
1. Determine the quantity of sensors N that should be connected to single UART line.
2. Determine forward voltage Uf of Schottky diodes (VD_N).
3. Calculate the minimum allowed resistance Rmin by using the following equation:
R!"# =U$− U%
I&'(
×
(
N − 1
)
+,
where:
Uh – maximum high logic level voltage (2.7 V);
Iout – maximum output current of sensor microcontroller (25 mA).

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6. STORAGE AND TRANSPORTATION
Transportation can be done by all means of transportation in covered vehicles as well as in a
heated pressurized plane compartments in accordance with the rules of cargoes transportation
actual for the respective type of transportation.
Sensor in manufacturer’s package should be kept in supplier and customer’s storages under
storage conditions specified in Table 2. Ambient atmosphere should be free of any harmful impurities
that can cause corrosion.

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7. WARRANTY
Manufacturer guarantees sensor compliance with specifications and requirements stated in
this UM if customer follows operating, transportation and storage terms.
During warranty period, manufacturer replaces or repairs for free all its products that do not
operate because of production fault.
Warranty period is 24 months since product is shipped to customer. Shipment date is
registered in the manufacturer’s certificate ESAT.100200.00 PS.
Manufacturer is not responsible for sensor fault and discontinues warranty in following cases:
• if the rules and conditions of operation, transportation and storage stated in this UM and
in sensor datasheet were violated;
• if sensor has marks of unauthorized repair attempts;
• if any mechanical damage occurs and/or if any damage is caused by exposure to
extremely high or low temperatures, corrosion, oxidation, ingression of any foreign objects,
materials, liquids, insects;
• if sensor was damaged by using connection circuit that does not comply with requirements
stated in this UM;
• if damage is caused by force majeure, accident, intentional or careless actions of the
customer or third parties;
• if damage (or fault) is caused by installing, editing or damaging sensor firmware and/or by
making changes to the firmware settings using service codes;
• if damage (or fault) is caused by the fact of power and signal cables do not meet the
standard or technical regulations and/or by electromagnetic interferences exceeding
permissible according to EN 60079-29-1:2016.
Replacement or repairs of faulty sensor does not extend initial warranty period.
Manufacturer is not responsible for any possible damage directly or indirectly caused by sensor
to people and property in case it is a result of improper usage, storage and transportation or due to
intentional or careless actions of the customer and/or third parties.
Risks and costs of transportation and packaging as well as other contingencies concerning
product return to manufacturer are carried out by the customer.
For warranty information or additional assistance, please contact support service
(see Chapter 8).

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8. CONTACTS
MIPEX TECHNOLOGY
SIA MIPEX
2B, Valkas iela, Daugavpils, Latvia, 5417
Tel/fax: [phone]
web: www.mipex-tech.com
e-mail: [e-mail]
support: [e-mail]

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APPENDIX A. SENSOR TYPES AND CHARACTERISTICS
* See Table 5 for details.
** See Table 6 for details.
MIPEX-02-B-RX-D.1 G
Interface:
1. UART, 4 pins
Housing type:
1. sensor housing made of stainless steel, with
diffusion holes in its reflecting cover
2. sensor housing made of stainless steel, with
diffusion holes in its reflecting cover and with
additional side diffusion holes
Target gas:
1. CH4
2. C3H8
Modification index:
G – Sensor is not explosive protected
RX-code:
R – Calibration gas and range*
X – Temperature class**

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Table 5. Metrological properties of sensor (RX-code)
Part number code
Target gas6
Calibration gas
Meas. range, % vol.
Temp. range, °C
RX
MIPEX-02-1-00-D.1 G
CH4
CH4
0…2.5
-10…+40
00
MIPEX-02-1-01-D.1 G
-40…+60
01
MIPEX-02-1-02-D.1 G
-20…+50
02
MIPEX-02-1-61-D.1 G
C3H8
0…1.5
-40…+60
61
MIPEX-02-1-62-D.1 G
-20…+50
62
MIPEX-02-2-61-D.1 G
C3H8
C3H8
0…1.5
-40…+60
61
MIPEX-02-2-62-D.1 G
-20…+50
62
6
Typical sensor sensitivity to other hydrocarbons is shown on Fig. 7 and Fig. 8.

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Table 6. Basic sensor readings variability
7
Calibration
gas
Readings variability within a temperature
range
Additional variabil-
ity due to pressure
Additional variabil-
ity due to humidity
CH4
±0.1% vol. or ±5% of indication (whichever is
greater) within the range of +20…+25 °C;
±0.2% vol. or ±30%
of indication (which-
ever is greater) at
100 kPa (test: 80
kPa, 100 kPa, 120
kPa)
±0.2% vol. or ±15%
of indication (which-
ever is greater) at 40
°C (test: 20% RH,
50% RH, 90% RH)
±0.2% vol. or ±10% of indication (whichever
is greater) within the range of -10…+20 °C
and +25…+40 °C;
±0.4% vol. or ±20% of indication (whichever
is greater) within the range of -40…-10 °C
and +40…+60 °C.
C3H8
±0.05% vol. or ±5% of indication (whichever
is greater) within the range of +20…+25 °C;
±0.1% vol. or ±30%
of indication (which-
ever is greater) at
100 kPa (test: 80
kPa, 100 kPa, 120
kPa)
±0.1% vol. or ±15%
of indication (which-
ever is greater) at 40
°C (test: 20% RH,
50% RH, 90% RH)
±0.1% vol. or ±10% of indication (whichever
is greater) within the range of -10…+20 °C
and +25…+40 °C;
±0.2% vol. or ±20% of indication (whichever
is greater) within the range of -40…-10 °C
and +40…+60 °C.
7
The table shows basic variability of MIPEX-02 sensor readings. For each sensor modification, readings
variability stated in Table 6 is provided within a temperature range determined by a sensor RX-code (see Table
5).