Mipex MIPEX-02 User manual

USER MANUAL
INFRARED GAS SENSOR MIPEX-02-B-C-D.1 A (RX)
Mipex-02-B-C-D.1A(RX)
User Manual.docx
Revision 3.1
September 17th, 2021
Page 1 of 44
THE SOLE PROPERTY OF SIA MIPEX. ANY REPRODUCTION WITHOUT THE WRITTEN PERMISSION OF SIA MIPEX IS PROHIBITED.
INFRARED GAS SENSOR
MIPEX-02-B-C-D.1 A (RX)
USER MANUAL
ESAT.100300.00.03 UM

USER MANUAL
INFRARED GAS SENSOR MIPEX-02-B-C-D.1 A (RX)
Mipex-02-B-C-D.1A(RX)
User Manual.docx
Revision 3.1
September 17th, 2021
Page 2 of 44
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
3.1
September 17,
2021
Change of software version to 25.8.
03
March 26, 2020
During operation, maximum surge current - 15 mA (was 10 mA)
High logic level for receiving line RxD is in range of + 2.4 ... + 2.7 V
(it was + 2.4 ... + 3.4).
6.4 Getting started - the value is displayed as “-0001” (was “-1”)
Deleted Fig. 14. Connection diagram for MIPEX-02 via MIPEX-02/03
interface board.
Removed firmware 25.67 and 24.67.
02
February 21, 2020
Adding to the document CH4, C3H8 and CH4/CH4+C2H6 sensors, with
polycarbonate Lexan type of housings.
01
July 25th, 2018
Published version.

USER MANUAL
INFRARED GAS SENSOR MIPEX-02-B-C-D.1 A (RX)
Mipex-02-B-C-D.1A(RX)
User Manual.docx
Revision 3.1
September 17th, 2021
Page 3 of 44
THE SOLE PROPERTY OF SIA MIPEX. ANY REPRODUCTION WITHOUT THE WRITTEN PERMISSION OF SIA MIPEX IS PROHIBITED.
Table of contents
1. Introduction ............................................................................................................................... 4
1.1. List of abbreviations .......................................................................................................... 4
1.2. List of terms ....................................................................................................................... 4
2. Description ................................................................................................................................ 5
3. Technical specifications .......................................................................................................... 7
4. Intrinsic safety .......................................................................................................................... 9
5. Handling precautions ............................................................................................................. 10
6. Installation and service .......................................................................................................... 11
6.1. Preparation ...................................................................................................................... 11
6.2. Mounting .......................................................................................................................... 11
6.3. Electrical conditions ......................................................................................................... 12
6.4. Getting started ................................................................................................................. 15
6.5. Connecting multiple sensors to single UART line ........................................................... 15
7. Storage and transportation .................................................................................................... 17
8. Warranty .................................................................................................................................. 18
9. Contacts .................................................................................................................................. 19
Appendix A. Sensor types and characteristics ....................................................................... 20
Appendix B. Connection diagram ............................................................................................. 26
Appendix C. UART communication protocol ........................................................................... 28
Appendix C.1. General information ........................................................................................ 28
Appendix C.2. Communication protocol commands .............................................................. 29
Appendix C.2.1. Commands for requesting measured data .......................................... 29
Appendix C.2.2. Commands for controlling operating mode .......................................... 32
Appendix C.2.3. Commands for requesting factory settings and properties .................. 32
Appendix C.2.4. Commands for sensor configuring and span calibrating ..................... 33
Appendix C.2.5. Commands for configuring net address ............................................... 36
Appendix D. Sensor configuration ........................................................................................... 37
Appendix D.1. Zeroing and span calibration .......................................................................... 37
Appendix D.2. Temperature dependence of zero adjustment ................................................ 40
Appendix E. Dust filter attaching .............................................................................................. 41
Appendix F. Troubleshooting ................................................................................................... 42

USER MANUAL
INFRARED GAS SENSOR MIPEX-02-B-C-D.1 A (RX)
Mipex-02-B-C-D.1A(RX)
User Manual.docx
Revision 3.1
September 17th, 2021
Page 4 of 44
THE SOLE PROPERTY OF SIA MIPEX. ANY REPRODUCTION WITHOUT THE WRITTEN PERMISSION OF SIA MIPEX IS PROHIBITED.
1. INTRODUCTION
This user manual (UM) is intended to describe design and operation of small-sized gas sensor
MIPEX-02-B-C-D.1 A (RX) (hereinafter MIPEX-02 or sensor). UM contains basic technical data,
recommendations and other information necessary for proper operation, maintenance and storage
of sensor.
Sensor is intended for automatic continuous measurement of carbon dioxide or hydrocarbons
concentration in hazardous areas atmosphere. Sensor can be used as a part of gas-analyzing
equipment of groups I and II according to IEC 60079-0, IEC 60079-11 in the explosion-hazardous
zones of classes 0, 1, 2 according to IEC 60079-10-1, and Class I, Division 1, Group A, B, C, D
according to UL Std. 913, CAN/CSA Std. C22.2 No.157-92. All models are suitable for equipment
with temperature classes T1 – T5 at maximum ambient temperature of 60 °C.
SIA MIPEX reserves the right to make changes to this manual, excluding intrinsically
safe sensor parameters.
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 “>”.

USER MANUAL
INFRARED GAS SENSOR MIPEX-02-B-C-D.1 A (RX)
Mipex-02-B-C-D.1A(RX)
User Manual.docx
Revision 3.1
September 17th, 2021
Page 5 of 44
THE SOLE PROPERTY OF SIA MIPEX. ANY REPRODUCTION WITHOUT THE WRITTEN PERMISSION OF SIA MIPEX IS PROHIBITED.
2. DESCRIPTION
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.
Infrared radiation from LED permeates through a measuring diffusion-type gas cell and arrives
on signal and reference photodetectors, one of which detects radiation only in the wavelength range
of infrared radiation absorbed by gases, while the other one detects radiation only in the wavelength
range of 3.5…3.7 μm for hydrocarbons and 4.0…4.25 μm for carbon dioxide. Gas flowing through
the cell absorbs the radiation of the operating wavelength (!s) and does not affect the radiation of
the reference wavelength (!ref). Amplitude of the photodetector operating and reference signals, "s
and "ref, varies with the target gas concentration in accordance with the following equation:
"!
""#$
#$%&
'
(
)
*
'
!!
+
( *
'
!"#$
+,
- . - /
+
where:
0'!+ – absorption coefficient at the predetermined wavelength;
/ – optical length of the cell;
1 – measured gas concentration;
"s, "ref – photodetector signals amplitude.
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.