BRIGHT BlueEye Ex-D User manual

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BlueEye™Ex-D
Operating Manual BlueEye™Ex-D
Release date: 25.01.2022
Version: 02
MEMS based gas quality analyzer

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Disclaimer of Liability
The information in this user’s manual is presented in good faith and
believed to be accurate. Bright Sensors SA has reviewed the contents
of this publication to ensure consistency with the hardware and software
described. Nevertheless, since variance cannot be precluded entirely,
Bright Sensors SA cannot guarantee full consistency. However, the
information in this publication is reviewed regularly and any necessary
corrections are included in subsequent editions.
You are solely responsible for proper operation of the described
products. The instructions in this manual do not relieve you of your
obligation for safe handling during application, installation, operation
and maintenance.
By using this manual, you acknowledge that Bright Sensors SA cannot
be held liable for any damages in excess of the purchase liability
regulation. We reserve the right to make changes to this manual at any
time without notice.
Contact data
Bright Sensors SA
Address: Rue de la Maladière 71c
2002 Neuchâtel
Switzerland
Phone: [phone]
Email: [e-mail]
Internet: www.bright-sensors.com

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Safety Precautions
Safety, Protection, and Modification of the Product
•In order to protect the system controlled by the product and the product itself
and ensure safe operation, observe the safety precautions described in this
user’s manual. Bright Sensors SA assume no liability for safety if users fail to
observe these instructions when operating the product.
•If this product is used in a manner not specified in this user’s manual, the
protection provided by this product may be impaired.
•If any protection or safety circuit is required for the system controlled by the
product or for the product itself, prepare it separately.
•Be sure to use the spare parts approved by Bright Sensors SA when replacing
parts or consumables.
•Modification of the product is strictly prohibited.
The following safety symbols are used in this manual:
This warning notice informs you of imminently threatening dangers that can arise
due to misuse/operator error. If these situations are not avoided, death or severe
injuries can occur.
This warning notice informs you of potentially dangerous situations that can arise
due to misuse/operator error. If these situations are not avoided, minor injuries can
occur.
This notice informs you of potentially dangerous situations that can arise due to
misuse/operator error. If these situations are not avoided, damage to the device or
nearby property can occur.
This notice can provide you with helpful tips to make your work easier. This notice
also provides you with further information about the device or the work process in
order to prevent operator error.

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Table of Contents
1. Introduction .............................................................................................................................5
1.1 Function of the BlueEye™Ex-D ..................................................................................................................... 5
1.2 Working with the BlueEye™Ex-D................................................................................................................... 7
1.3 Dangers during installation, maintenance, and repair.............................................................................. 7
1.4 Certification for hazardous areas ................................................................................................................. 8
2. Installation..............................................................................................................................11
2.1 Dimensions of the BlueEye™Ex-D............................................................................................................... 11
2.2 Piping and Instrumentation Diagram ......................................................................................................... 12
2.3 Mounting position and gas flow direction ................................................................................................. 13
2.4 Best measuring performance...................................................................................................................... 13
2.5 Gas inlet conditions ...................................................................................................................................... 13
2.6 Pollution and Abrasion ................................................................................................................................. 14
2.7 Mechanical Stress, Liquids and Dirt ............................................................................................................ 14
2.8 Maximum Torque .......................................................................................................................................... 14
2.9 Electrical connection ................................................................................................................................... 14
2.10 Current loop wiring ....................................................................................................................................... 15
2.11 RS-485 Modbus RTU connection.................................................................................................................. 15
3. Operation...............................................................................................................................16
3.1 Communication with the BlueEye™Ex-D .................................................................................................. 16
3.2 First time usage.............................................................................................................................................. 17
3.3 Reported output ........................................................................................................................................... 17
3.4 Calibration 4-20 mA current loop ............................................................................................................... 19
3.5 Combustion and Metering reference conditions ..................................................................................... 20
3.6 Data logging ................................................................................................................................................. 21
4. Maintenance & regular checks...........................................................................................23
5. Technical Data ......................................................................................................................25
5.1 Electrical Parameter ..................................................................................................................................... 25
5.2 Gas pressure parameter .............................................................................................................................. 25
5.3 Operating temperature ............................................................................................................................... 25
5.4 Measured media .......................................................................................................................................... 25
6. APPENDIX ...............................................................................................................................27
6.1 Appendix A: Modbus Communication Protocol ...................................................................................... 27
6.2 Appendix B: Certificates .............................................................................................................................. 27
6.3 Appendix C: Calibration Report ................................................................................................................. 29

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1. Introduction
The gas quality analyzer BlueEye™Ex-D is designed and produced according to the state of the art and
generally recognized safety standards and directives. However, its use can entail dangers that are avoidable
by complying with this manual. The BlueEye™Ex-D must only be used as intended and in technically sound
condition.
The BlueEye™Ex-D is available in the following versions:
1. BlueEye™Ex-D Extended
2. BlueEye™Ex-D Renewable
3. BlueEye™Ex-D Hydrogen
4. BlueEye™Ex-D Ultragreen
This manual is applicable to all versions of the BlueEye™Ex-D.
Unintended use of the device voids all warranty claims.
All of the following safety notices must be observed! Disregard of the safety notices can result in danger to the
life and limb or environmental and property damage.
1.1Function of the BlueEye™Ex-D
The BlueEye™Ex-D is a MEMS (Micro-electromechanical systems) gas quality measurement device. The
integrated sensor unit combines Bright Sensors` patented dynamic viscosity measurement principle with other
MEMS based measurement techniques, like thermal conductivity and Integrated Infrared (INIR).
Based on Bright Sensors proprietary database of thousands of gas compositions, the gas combustion
properties are calculated by industry standards. Through correlative models the measurement properties are
then correlated to the gas combustion parameters.
Figure 1: Sensor cell

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The BlueEye™Ex-D correlates these measurements to the following parameters of a gas composition:
•Gross Calorific Value –Hs(ISO 6976:2016 / GPA 2172:2009)
•Net Calorific Value –Hi(ISO 6976:2016 / GPA 2172:2009)
•Gross Wobbe Index –WIs(ISO 6976:2016 / GPA 2172:2009)
•Net Wobbe Index –WIi (ISO 6976:2016 / GPA 2172:2009)
•Density –ρ(ISO 6976:2016 / GPA 2172:2009)
•Relative Density –ρrel. (ISO 6976:2016 / GPA 2172:2009)
•Compression factor –Z(ISO 6976:2016 / GPA 2172:2009)
•Air-Fuel ratio –AFR (calculated based on 20.946% oxygen in air)
•Stoichiometric Air-Fuel Ratio –s-ARF (calculated based on 20.946% oxygen in air)
•Methane Number –MN (ISO23306 PKI Methane Number)
•Carbon dioxide mol% –CO2mol% (based on IR CO2sensor)
•Hydrogen mol% –H2mol% (based on Bright Sensors correlative model)
The by the device deployed correlative models are temperature and pressure compensated within a
defined range. To ensure measurement results within specifications, the following boundary conditions MUST
be ensured for each BlueEye™Ex-D model individually:
BlueEye™Ex-D Specifications
Reported values
Units
Reference conditions
Applied correlation and
calculation standards
Gross Calorific Value (Hs)
MJ/m³, kWh/m³
BTU/scf,
Therm/scf
0/0°C, 15/0°C, 15/15°C,
20/20°C, 25/20°C at
101325 Pa and 60°F
at 14.65, 14.696, 14.73 psi
and 15.025 psi absolute
NIST AGA-8
ISO 6976:2016
GPA 2172:2009
Net Calorific Value (Hi
Gross Wobbe Index (WIs)
Net Wobbe Index (WIi)
Density ρ
kg/m³, lbm/scf
Air Fuel Ratio λ
-
Volume, 20.946% O2
Simplified method
Methane Number
-
-
ISO23306 PKI Methane Number
CO2& H2concentration 12
mol%
-
Proprietary methods
•
Accuracy
≤ 1% of reading
Repeatability
≤ 0.2% of reading 3
Dynamics
One measurement every 1s, reaction time T90 < 60s
•
Gas Composition Range
CH4
70-100 mol%
Higher Alcanes
0-1 mol%
O2
≤ 3 mol%
C₂H₆
0-20 mol%
N2
0-15 mol%
H2O (Gaseous)
≤ 0.1 mol%
C3H8
0-5 mol%
CO2
0-3 mol% (20/100 mol%) 1
Dust, Liquids
Without
C4H10
0-3 mol%
H2
≤ 0.5 mol% (30 mol%)2
H2S
≤ 0.01 mol%
Hsaddressable range
Environment temperature
Medium inlet temperature
Operating gas pressures
Flow rate
27.52 to 50.40 MJ/m3(15°C/15°C)
0 to 50°C, 32 to 122°F
Within +/- 2°C, 36°F from environment temperature
960 to 1100 mbar absolute, 13.9 to 16 psi absolute
50 ml/min (+/- 10%), 0.00177 scf/min (+/- 10%)4
1only for BlueEye™Ex-D Renewable & Ultragreen 2only for BlueEye™Ex-D Hydrogen &Ultragreen
3 unfiltered 1 second cycle measurement 4flow rate range customizable on request

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1.2Working with the BlueEye™Ex-D
All of the following safety notices must be observed! Disregard of the safety notices can result in danger to the
life and limb or environmental and property damage.
Bear in mind that the safety warnings in this manual and on the device cannot cover all potentially dangerous
situations, because the interaction of various conditions can be impossible to foresee. Merely following the
instructions may not suffice for correct operation. Always remain attentive and consider potential
consequences.
•Read this operating manual and especially the following safety notices carefully before working with
the device for the first time.
•Warnings are provided in the operating manual for unavoidable residual risks for users, third parties,
equipment or other property. The safety instructions used in this manual do not refer to unavoidable
residual risks.
•Only operate the device in fault-free condition and in observance of the operating manual.
•Compliance with local statutory accident prevention, installation and assembly regulations is also
mandatory.
All notices in the manual must be observed. Use of the BlueEye™Ex-D is only permitted in accordance with
the specifications in the operating manual. Bright Sensors SA assumes no liability for damages arising due to
disregard of the operating manual.
The BlueEye™Ex-D complies with current standards and regulations. However, danger can arise with misuse
and the BlueEye™Ex-D can be destroyed due to operator error. The technical specifications in this operation
manual must be observed and followed for safe operation. Performance limits must not be exceeded. For
safe operation, the BlueEye™Ex-D must only be used in the scope of the intended use. Service and
maintenance tasks or repairs that are not described in the operating manual must not be carried out without
prior consultation with Bright Sensors SA.
1.3Dangers during installation, maintenance, and repair
The BlueEye™Ex-D is approved to be used in hazardous areas. Observe the information given in the
applicable type or unit examination certificate and the relevant country-specific regulations for installation
and use in hazardous areas. No observance can result in serious injury and/or damage to the equipment.
Install the device as specified in the operating manual. Improper installation can lead to the loss of the
explosion protection and to life-threatening situations.

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In general, the following is recommended for all persons working with or on the BlueEye™Ex-D:
•Training / education for work in hazardous areas.
•The ability to correctly estimate dangers and risks when working with the BlueEye™Ex-D.
•Training / education by Bright Sensors SA for work with gas measuring devices.
•Education / instruction in all national standards and directives to be complied with for the work to be
carried out on the BlueEye™Ex-D.
Operating personnel:
The operating personnel use and operate the device in the scope of the intended use.
Maintenance personnel:
Work on the device must only be carried out by qualified personnel who can carry out the respective tasks
on the basis of their technical training, experience and familiarity with the applicable standards and
requirements. These qualified personnel are familiar with the applicable statutory regulations for accident
prevention and can independently recognize and avoid potential dangers.
Maintenance and cleaning:
Maintenance and cleaning must only be performed by appropriately qualified technicians.
The device can be damaged if it is not cleaned as specified in the operating manual. Only clean the device
as specified in the operating manual. Components can be damaged if you do not use suitable tools.
- Only clean the device with a slightly damp cloth!
The BlueEye™Ex-D enclosure is epoxy coated. Under certain extreme conditions it may generate an ignition-
capable level of electrostatic charges.
- DO ensure that the equipment is NOT installed in a location where it may be subjected to
external conditions (such as high-pressure steam) which might cause a build-up of
electrostatic charges on non-conducting surfaces.
1.4Certification for hazardous areas
Hazardous area classifications:
•Zone 0: An area classified as Zone 0 will have ignitable concentrations of flammable gases, vapours
or liquids either continuously present or present for long periods of time under normal operating
conditions.
•Zone 1: An area classified as Zone 1 is likely to have ignitable concentrations of flammable gases,
vapours or liquids present under normal operating conditions. Flameproof (Exd) detectors are suitable
for use in Zone 1.
•Zone 2: An area classified as Zone 2 is not likely to have ignitable concentrations of flammable gases,
vapours or liquids present under normal operating conditions. Flameproof (Exd) detectors are suitable
for use in Zone 2.
•Areas that may contain flammable dusts are categorized as Zone, 20, Zone 21 and Zone 22.

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Under European ATEX rules hazardous area equipment has been re-defined under ‘equipment categories’
where:
•Equipment Category 1 is suitable for Zone 0
•Equipment Category 2 is suitable for Zone 1
•Equipment Category 3 is suitable for Zone 2
The BlueEye™Ex-D is II 2 G Ex db IIC T6 Gb certified and is suitable for use in Zone 1 and Zone 2
hazardous areas.
Interpretation of the protection mark:
•–Specific marking for ATEX Explosion protection
•II –Equipment group (surface use)
•2 –Equipment category (used in zone 1 and zone 2)
•G –Environment (gas)
•Ex –Explosion protection IECEx
•db –Type of protection (flameproof enclosures)
•IIC –Gas group (hydrogen, acetylene)
•T6 –Temperature class (<85°C)
•Gb –Equipment protection level
In order to achieve "Ex db" protection, we use a certified housing, a certified cable gland and our own
specifically designed (sintered metal flame arrestor) gas connectors. The details are:
•Certified enclosures (8100PB) Aluminium, epoxy coated with blind cover
Certificate number: Sira08ATEX1325U and IECEx SIR 08.0126U
•Certified cable gland (PAX series) for armoured cable
Certificate number: INERIS 10ATEX0029X and IECEx INE 14.0003X
•Speficially designed gas connectors with sintered metal flame arrestor as per drawing in Figure 1 on
the next page. The sintered metal has the following properties:
•R80 filter grade
•55 µm pore size
•705 Pa Bubble Point
•4.3 –4.7 g/cm3 density

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Figure 2: Specifically designed gas connector with flame arrestor
Nameplates are as follows:
Figure 3: Name plate layout

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2. Installation
2.1Dimensions of the BlueEye™Ex-D
Figure 4: External dimensions

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2.2Piping and Instrumentation Diagram
The BlueEye™Ex-D is strongly recommended to be connected to a gas supply in the following way:
Figure 5: Connection of the BlueEye™Ex-D to a gas pipeline
1
Main pipeline
2
Supply line: dry natural gas, as short as possible, 4 - 6 mm tube
3
Shut off valve (recommended)
4
10μm filter
5
Pressure reducer, required if main pipeline exceeds pressure of 1100 mbar absolute
6
¼″ NPT female gas INLET connector
7
¼″ NPT female gas OUTLET connector
8
BlueEye™Ex-D gas quality analyzer
9
Flow reducer, to set gas low at 50 ml/min (+/- 10%)
10
Gas vent to a safe area
Ensure that the type of gas present in the system is withing the gas composition range approved for the
BlueEye™Ex-D (see Chapter 5.4 Measured media). No observance not only could lead to possible damage
to the BlueEye™Ex-D sensor unit resulting is accuracy loss or even complete malfunction of the device.

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2.3Mounting position and gas flow direction
The BlueEye™Ex-D has to be mounted upright with gas connectors in horizontal position and with cable
gland perpendicular to the ground (see Figure 1: Connection of the BlueEye™Ex-D to a gas pipeline).
•Wall mounted, horizontally.
•Gas connector Inlet (6) left, gas connector Outlet (7) right.
•Cable gland pointing to the ground.
Gas flow direction
Figure 6: Gas flow direction and mounting requirements for the BlueEye™Ex-D
2.4Best measuring performance
The measurement will be carried out on a small amount of sample gas at low flow rates. For low latency results
install a purge bypass and avoid long gas lines.
The BlueEye™Ex-D is calibrated for absolute pressure range between 960 and 1100mbar absolute.
To achieve an accurate measurement reading it is necessary to a stable pressure in this absolute pressure
range. Fluctuating deviating pressures will result in temporarily or permanent inaccurate measurements.
2.5Gas inlet conditions
•Gas condition: Required is dry, filtered gas (with an external particle filtration down to 10 µm).
•Gas dew point: The gas mixture should be below 10 K of the lowest operating temperature.
•Gas pressure range: 960 to 1100 mbar absolute (13.9 to 16 psi absolute)
•Gas temperature range: +/- 2°C (36°F) deviating from environment temperature
Applying a gas pressure above 1500 mbar absolute can result in danger to the life and limb or environmental
and property damage.

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2.6Pollution and Abrasion
Make sure there is no pollution inside the sensor in- and outlet before connecting the instrument. Do NOT use
any lubricant or sealant. Abrasion can damage or even destroy the sensor.
2.7Mechanical Stress, Liquids and Dirt
Do NOT insert any item into the openings. mechanical stress, liquids and dirt may damage or destroy the
sensor. Warranty excludes failures and damage caused by the customer, such as contamination, improper
electrical hook-up, dropping etc.
2.8Maximum Torque
To avoid mechanical damage, DO NOT drive more than 13 Nm torque on 1/4”NPT gas connectors and 2 Nm
on earth connector. When removing connected gas lines from the 1/4”NPT gas connectors ensure the gas
connectors are not turning by using a 27mm wrench.
Turning 1/4” NPT gas connectors can lead to damaging of the sensor cell within the BlueEye™Ex-D and will
lead to loss of warranty.
2.9Electrical connection
The cable of the BlueEye™Ex-D has 9 wires, with the following numbers printed on each individual wire, except
for the Yellow/Green wire. The numbers correspond to the following connections:
Wire ID
Description
1, Black
Power supply
+24 VDC
2, Black
Power supply
-24 VDC
3, Black
4-20 mA Current Loop
+
4, Black
4-20 mA Current Loop
-
5, Black
T+
RS485_A
6, Black
T-
RS485_B
7, Black
R+ (D+)
RS485_Y
8, Black
R- (D-)
RS485_Z
Yellow/Green
GND
Ground
Wires 1 and 2 connect the 24 VDC (+/- 10%) power supply.
Wires 3 and 4 connect the 4-20 mA current loop
Wires 5, 6, 7 and 8 connect the RS-485 Modbus RTU.
Wire 9 is the ground of the BlueEye™Ex-D.
Special care must be taken with the connection of the outer end of the electrical cable of the BlueEye™Ex-
D. In case the outer end of the cable is installed within the ATEX zone, an ATEX approved junction box has to
be connected to the outer end of the cable.

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2.10 Current loop wiring
The BlueEye™Ex-D features a single, passive 4-20 mA current loop.
In order to use the current loop correctly, it has to be powered with 24VDC as shown in the figure below.
Figure 7: BlueEye™Ex-D passive current loop wiring
2.11 RS-485 Modbus RTU connection
The BlueEye™Ex-D is configured for both full-duplex (4-wire) and half-duplex (2-wire) RS485 Modbus.
Figure 7: BlueEye™Ex-D RS-485 Modbus RTU connection
For installation in hazardous areas ensure that the enclosure is potentially equalized. To increase immunity
against electromagnetic interference, Bright Sensors SA recommends connecting the shield of the cable to
earth at the outer end. Attention for applications in hazardous areas, it must be ensured that potential
equalization exists between the various earthing points (i.e. between the hazardous area and safe area). For
more information, please refer to standard EN 60079-14. Cover flying leads with fine wires by an end splice
(cable preparation).
Ensure that supplied voltage adheres to the specified electrical characteristics and never exceeds the
maximum limit.
Electrostatic discharge can damage equipment, impair electrical circuitry, and can result in complete or
intermittent failures. Always place the protective caps on the connector when they are not used and do not
touch the connector pins.

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3. Operation
The BlueEye™Ex-D has no external or internal switches. By connecting wire 1 to +24 VDC and wire 2 to -24
VDC (as shown in the table under heading 2.9 “Electrical connection”), the BlueEye™Ex-D will
automatically start operating. After approximately 3 minutes data communication via RS485 Modbus RTU is
activated and the 4-20 mA current loop will provide a signal.
3.1Communication with the BlueEye™Ex-D
There are two ways to communicate with the BlueEye™Ex-D:
1. Over RS485 Modbus RTU
2. By using Bright Sensors` Modbus USB Windows Interface Package
Communication over RS485 Modbus RTU requires the user to connect the BlueEye™Ex-D to its own Modbus
system. Communication over Bright Sensors` Modbus USB Windows Interface Package allows the user to
operate the BlueEye™Ex-D in a Plug and Play way. It has additional functionality such as charting, storing
the output parameters in CSV format, and switching reference condition and units, applying moving
averages, etc.
Figure 8: BlueEye™Ex-D Modbus USB Windows Interface Package
For more specific information on the Modbus USB Windows Interface Package please read the Modbus USB
Windows Interface Package manual, to be found here: https://www.bright-sensors.com/blueeye-ex-d/

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3.2First time usage
To reduce warmup time during first operation when the BlueEye™Ex-D is for the first time connected to a
gas supply, it is recommended to use the “Boosting” function. This function can be activated by Modbus or
by using the Modbus USB Windows Interface Package.
3.3Reported output
The BlueEye™Ex-D writes every second the following parameters to dedicated registers and continuously
reports 1 selected parameter via the single 4-20mA current loop:
•Gross Calorific Value –Hs
•Net Calorific Value –Hi
•Gross Wobbe Index –WIs
•Net Wobbe Index –WIi
•Density –ρ
•Relative Density –ρrel.
•Compression factor –Z
•Air-Fuel ratio –AFR
•Stoichiometric Air-Fuel Ratio –s-ARF
•Methane Number –MN
•Carbon dioxide mol% –CO2mol% only for Renewable and Ultragreen models
•Hydrogen mol% –H2mol% only for Hydrogen and Ultragreen models
Please check the Modbus Manual in Appendix A for the Modbus. The default 4-20mA current loop ranges
are defined as per table below and can be modified individually via the Modbus registers. The 4-20mA
current loop output and range can be user defined via the Modbus registers.
Selectable Measurement Output
One of following parameters: Hs, Hi, WIs, WIi, ρ, ρrel., Z, AFR, s-AFR, MN, CO2, H2,
Temperature, Absolute pressure
Default Output Range Definition
Default ranges per table below. Customization range possible via Modbus.
Output
Ref Con
Units
Range
Output
Ref Con
Units
Range
Output
Ref Con
Units
Range
Hs
00/00
MJ/m3
26 - 58
Hi
00/00
MJ/m3
23 - 53
WIs
00/00
MJ/m3
32 - 63
Hs
15/00
MJ/m3
26 - 58
Hi
15/00
MJ/m3
23 - 53
WIs
15/00
MJ/m3
32 - 63
Hs
15/15
MJ/m3
25 - 55
Hi
15/15
MJ/m3
22 - 50
WIs
15/15
MJ/m3
30 - 60
Hs
20/20
MJ/m3
25 - 54
Hi
20/20
MJ/m3
22 - 49
WIs
20/20
MJ/m3
29 - 59
Hs
25/00
MJ/m3
26 - 58
Hi
25/00
MJ/m3
23 - 53
WIs
25/00
MJ/m3
32 - 63
Hs
25/20
MJ/m3
25 - 54
Hi
25/20
MJ/m3
22 - 49
WIs
25/20
MJ/m3
29 - 59
Hs
00/00
kWh/m3
7 - 16
Hi
00/00
kWh/m3
6 - 15
WIs
00/00
kWh/m3
9 - 18
Hs
15/00
kWh/m3
7 - 16
Hi
15/00
kWh/m3
6 - 15
WIs
15/00
kWh/m3
9 - 18
Hs
15/15
kWh/m3
7 - 15
Hi
15/15
kWh/m3
6 - 14
WIs
15/15
kWh/m3
8 - 17
Hs
20/20
kWh/m3
7 - 15
Hi
20/20
kWh/m3
6 - 14
WIs
20/20
kWh/m3
8 - 17
Hs
25/00
kWh/m3
7 - 16
Hi
25/00
kWh/m3
6 - 15
WIs
25/00
kWh/m3
9 - 18
Hs
25/20
kWh/m3
7 - 15
Hi
25/20
kWh/m3
6 - 14
WIs
25/20
kWh/m3
8 - 17
Hs
00/00
BTU/scf
697.8 - 1556.7
Hi
00/00
BTU/scf
617.3 - 1422.5
WIs
00/00
BTU/scf
858.9 - 1690.9
Hs
15/00
BTU/scf
697.8 - 1556.7
Hi
15/00
BTU/scf
617.3 - 1422.5
WIs
15/00
BTU/scf
858.9 - 1690.9
Hs
15/15
BTU/scf
671 - 1476.2
Hi
15/15
BTU/scf
590.5 - 1342
WIs
15/15
BTU/scf
805.2 - 1610.4
Hs
20/20
BTU/scf
671 - 1449.3
Hi
20/20
BTU/scf
590.5 - 1315.1
WIs
20/20
BTU/scf
778.3 - 1583.5
Hs
25/00
BTU/scf
697.8 - 1556.7
Hi
25/00
BTU/scf
617.3 - 1422.5
WIs
25/00
BTU/scf
858.9 - 1690.9
Hs
25/20
BTU/scf
671 - 1449.3
Hi
25/20
BTU/scf
590.5 - 1315.1
WIs
25/20
BTU/scf
778.3 - 1583.5
Hs
00/00
therm/scf
0.007 - 0.0156
Hi
00/00
therm/scf
0.0062 - 0.0142
WIs
00/00
therm/scf
0.0086 - 0.0169
Hs
15/00
therm/scf
0.007 - 0.0156
Hi
15/00
therm/scf
0.0062 - 0.0142
WIs
15/00
therm/scf
0.0086 - 0.0169

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Hs
15/15
therm/scf
0.0067 - 0.0148
Hi
15/15
therm/scf
0.0059 - 0.0134
WIs
15/15
therm/scf
0.0081 - 0.0161
Hs
20/20
therm/scf
0.0067 - 0.0145
Hi
20/20
therm/scf
0.0059 - 0.0132
WIs
20/20
therm/scf
0.0078 - 0.0158
Hs
25/00
therm/scf
0.007 - 0.0156
Hi
25/00
therm/scf
0.0062 - 0.0142
WIs
25/00
therm/scf
0.0086 - 0.0169
Hs
25/20
therm/scf
0.0067 - 0.0145
Hi
25/20
therm/scf
0.0059 - 0.0132
WIs
25/20
therm/scf
0.0078 - 0.0158
Hs
60/14.696
MJ/m3
25 - 55.1
Hi
60/14.696
MJ/m3
22 - 50
WIs
60/14.696
MJ/m3
30 - 60
Hs
60/14.65
MJ/m3
25 - 55.1
Hi
60/14.65
MJ/m3
22 - 50
WIs
60/14.65
MJ/m3
30 - 60
Hs
60/14.73
MJ/m3
25 - 55.1
Hi
60/14.73
MJ/m3
22 - 50
WIs
60/14.73
MJ/m3
30 - 60
Hs
60/15.025
MJ/m3
25 - 55.1
Hi
60/15.025
MJ/m3
22 - 50
WIs
60/15.025
MJ/m3
30 - 60
Hs
60/14.696
kWh/m3
6.9 - 15.3
Hi
60/14.696
kWh/m3
6.1 - 13.9
WIs
60/14.696
kWh/m3
8.3 - 16.7
Hs
60/14.65
kWh/m3
6.9 - 15.3
Hi
60/14.65
kWh/m3
6.1 - 13.9
WIs
60/14.65
kWh/m3
8.3 - 16.7
Hs
60/14.73
kWh/m3
6.9 - 15.3
Hi
60/14.73
kWh/m3
6.1 - 13.9
WIs
60/14.73
kWh/m3
8.3 - 16.7
Hs
60/15.025
kWh/m3
6.9 - 15.3
Hi
60/15.025
kWh/m3
6.1 - 13.9
WIs
60/15.025
kWh/m3
8.3 - 16.7
Hs
60/14.696
BTU/scf
670 - 1480
Hi
60/14.696
BTU/scf
590 - 1342
WIs
60/14.696
BTU/scf
805 - 1610
Hs
60/14.65
BTU/scf
670 - 1480
Hi
60/14.65
BTU/scf
590 - 1342
WIs
60/14.65
BTU/scf
805 - 1610
Hs
60/14.73
BTU/scf
670 - 1480
Hi
60/14.73
BTU/scf
590 - 1342
WIs
60/14.73
BTU/scf
805 - 1610
Hs
60/15.025
BTU/scf
670 - 1480
Hi
60/15.025
BTU/scf
590 - 1342
WIs
60/15.025
BTU/scf
805 - 1610
Hs
60/14.696
therm/scf
0.0067 - 0.0148
Hi
60/14.696
therm/scf
0.0059 - 0.0134
WIs
60/14.696
therm/scf
0.0081 - 0.0161
Hs
60/14.65
therm/scf
0.0067 - 0.0148
Hi
60/14.65
therm/scf
0.0059 - 0.0134
WIs
60/14.65
therm/scf
0.0081 - 0.0161
Hs
60/14.73
therm/scf
0.0067 - 0.0148
Hi
60/14.73
therm/scf
0.0059 - 0.0134
WIs
60/14.73
therm/scf
0.0081 - 0.0161
Hs
60/15.025
therm/scf
0.0067 - 0.0148
Hi
60/15.025
therm/scf
0.0059 - 0.0134
WIs
60/15.025
therm/scf
0.0081 - 0.0161
WIs
00/00
MJ/m3
32 - 63
ρ
00/00
kg/m3
0.65 - 0.9
AFR
00/00
-
8 - 11
WIs
15/00
MJ/m3
32 - 63
ρ
15/00
kg/m3
0.65 - 0.9
AFR
15/00
-
8 - 11
WIs
15/15
MJ/m3
30 - 60
ρ
15/15
kg/m3
0.65 - 0.85
AFR
15/15
-
8 - 11
WIs
20/20
MJ/m3
29 - 59
ρ
20/20
kg/m3
0.6 - 0.85
AFR
20/20
-
8 - 11
WIs
25/00
MJ/m3
32 - 63
ρ
25/00
kg/m3
0.65 - 0.9
AFR
25/00
-
8 - 11
WIs
25/20
MJ/m3
29 - 59
ρ
25/20
kg/m3
0.6 - 0.85
AFR
25/20
-
8 - 11
WIs
00/00
kWh/m3
9 - 18
ρ
00/00
lb/scf
0.041 - 0.056
AFR
60/14.696
-
8 - 11
WIs
15/00
kWh/m3
9 - 18
ρ
15/00
lb/scf
0.041 - 0.056
AFR
60/14.65
-
8 - 11
WIs
15/15
kWh/m3
8 - 17
ρ
15/15
lb/scf
0.041 - 0.053
AFR
60/14.73
-
8 - 11
WIs
20/20
kWh/m3
8 - 17
ρ
20/20
lb/scf
0.037 - 0.053
AFR
60/15.025
-
8 - 11
WIs
25/00
kWh/m3
9 - 18
ρ
25/00
lb/scf
0.041 - 0.056
s-AFR
00/00
-
12 - 18
WIs
25/20
kWh/m3
8 - 17
ρ
25/20
lb/scf
0.037 - 0.053
s-AFR
15/00
-
12 - 18
WIs
00/00
BTU/scf
858.9 - 1690.9
ρ
60/14.696
kg/m3
0.65 - 0.85
s-AFR
15/15
-
12 - 18
WIs
15/00
BTU/scf
858.9 - 1690.9
ρ
60/14.65
kg/m3
0.65 - 0.85
s-AFR
20/20
-
12 - 18
WIs
15/15
BTU/scf
805.2 - 1610.4
ρ
60/14.73
kg/m3
0.65 - 0.85
s-AFR
25/00
-
12 - 18
WIs
20/20
BTU/scf
778.3 - 1583.5
ρ
60/15.025
kg/m3
0.65 - 0.85
s-AFR
25/20
-
12 - 18
WIs
25/00
BTU/scf
858.9 - 1690.9
ρ
60/14.696
lb/scf
0.041 - 0.053
s-AFR
60/14.696
-
12 - 18
WIs
25/20
BTU/scf
778.3 - 1583.5
ρ
60/14.65
lb/scf
0.041 - 0.053
s-AFR
60/14.65
-
12 - 18
WIs
00/00
therm/scf
0.0086 - 0.0169
ρ
60/14.73
lb/scf
0.041 - 0.053
s-AFR
60/14.73
-
12 - 18
WIs
15/00
therm/scf
0.0086 - 0.0169
ρ
60/15.025
lb/scf
0.041 - 0.053
s-AFR
60/15.025
-
12 - 18
WIs
15/15
therm/scf
0.0081 - 0.0161
ρ rel.
00/00
-
0.5 - 1
MN
00/00
-
65 - 100
WIs
20/20
therm/scf
0.0078 - 0.0158
ρ rel.
15/00
-
0.5 - 1
MN
15/00
-
65 - 100
WIs
25/00
therm/scf
0.0086 - 0.0169
ρ rel.
15/15
-
0.5 - 1
MN
15/15
-
65 - 100
WIs
25/20
therm/scf
0.0078 - 0.0158
ρ rel.
20/20
-
0.5 - 1
MN
20/20
-
65 - 100
WIs
60/14.696
MJ/m3
30 - 60
ρ rel.
25/00
-
0.5 - 1
MN
25/00
-
65 - 100
WIs
60/14.65
MJ/m3
30 - 60
ρ rel.
25/20
-
0.5 - 1
MN
25/20
-
65 - 100
WIs
60/14.73
MJ/m3
30 - 60
ρ rel.
60/14.696
-
0.5 - 1
MN
60/14.696
-
65 - 100
WIs
60/15.025
MJ/m3
30 - 60
ρ rel.
60/14.65
-
0.5 - 1
MN
60/14.65
-
65 - 100
WIs
60/14.696
kWh/m3
8.3 - 16.7
ρ rel.
60/14.73
-
0.5 - 1
MN
60/14.73
-
65 - 100
WIs
60/14.65
kWh/m3
8.3 - 16.7
ρ rel.
60/15.025
-
0.5 - 1
MN
60/15.025
-
65 - 100
WIs
60/14.73
kWh/m3
8.3 - 16.7
Z
00/00
-
0.99 - 1
CO2
00/00
-
0 - 20
WIs
60/15.025
kWh/m3
8.3 - 16.7
Z
15/00
-
0.99 - 1
CO2
15/00
-
0 - 20
WIs
60/14.696
BTU/scf
805 - 1610
Z
15/15
-
0.99 - 1
CO2
15/15
-
0 - 20
WIs
60/14.65
BTU/scf
805 - 1610
Z
20/20
-
0.99 - 1
CO2
20/20
-
0 - 20
WIs
60/14.73
BTU/scf
805 - 1610
Z
25/00
-
0.99 - 1
CO2
25/00
-
0 - 20
WIs
60/15.025
BTU/scf
805 - 1610
Z
25/20
-
0.99 - 1
CO2
25/20
-
0 - 20
WIs
60/14.696
therm/scf
0.0081 - 0.0161
Z
60/14.696
-
0.99 - 1
CO2
60/14.696
-
0 - 20
WIs
60/14.65
therm/scf
0.0081 - 0.0161
Z
60/14.65
-
0.99 - 1
CO2
60/14.65
-
0 - 20
WIs
60/14.73
therm/scf
0.0081 - 0.0161
Z
60/14.73
-
0.99 - 1
CO2
60/14.73
-
0 - 20

Bright Sensors SA All Right Reserved © 2021
19
WIs
60/15.025
therm/scf
0.0081 - 0.0161
Z
60/15.025
-
0.99 - 1
CO2
60/15.025
-
0 - 20
H2
00/00
-
0 - 40
Temp
00/00
°C
0 - 50
Pressure
00/00
Pa
98000 - 110000
H2
15/00
-
0 - 40
Temp
15/00
°C
0 - 50
Pressure
15/00
Pa
98000 - 110000
H2
15/15
-
0 - 40
Temp
15/15
°C
0 - 50
Pressure
15/15
Pa
98000 - 110000
H2
20/20
-
0 - 40
Temp
20/20
°C
0 - 50
Pressure
20/20
Pa
98000 - 110000
H2
25/00
-
0 - 40
Temp
25/00
°C
0 - 50
Pressure
25/00
Pa
98000 - 110000
H2
25/20
-
0 - 40
Temp
25/20
°C
0 - 50
Pressure
25/20
Pa
98000 - 110000
H2
60/14.696
-
0 - 40
Temp
60/14.696
°C
0 - 50
Pressure
60/14.696
Pa
98000 - 110000
H2
60/14.65
-
0 - 40
Temp
60/14.65
°C
0 - 50
Pressure
60/14.65
Pa
98000 - 110000
H2
60/14.73
-
0 - 40
Temp
60/14.73
°C
0 - 50
Pressure
60/14.73
Pa
98000 - 110000
H2
60/15.025
-
0 - 40
Temp
60/15.025
°C
0 - 50
Pressure
60/15.025
Pa
98000 - 110000
Temp
00/00
°F
32 - 122
Pressure
00/00
psi
14.2 - 16
Temp
15/00
°F
32 - 122
Pressure
15/00
psi
14.2 - 16
Temp
15/15
°F
32 - 122
Pressure
15/15
psi
14.2 - 16
Temp
20/20
°F
32 - 122
Pressure
20/20
psi
14.2 - 16
Temp
25/00
°F
32 - 122
Pressure
25/00
psi
14.2 - 16
Temp
25/20
°F
32 - 122
Pressure
25/20
psi
14.2 - 16
Temp
60/14.696
°F
32 - 122
Pressure
60/14.696
psi
14.2 - 16
Temp
60/14.65
°F
32 - 122
Pressure
60/14.65
psi
14.2 - 16
Temp
60/14.73
°F
32 - 122
Pressure
60/14.73
psi
14.2 - 16
Temp
60/15.025
°F
32 - 122
Pressure
60/15.025
psi
14.2 - 16
3.4Calibration 4-20 mA current loop
The BlueEye™Ex-D is factory delivered with a calibrated 4-20 mA current loop. Since actual mA output is
influenced by the (customer specific) current loop system, it is strongly advised to re-calibrate the current
loop once connected to your specific current loop system. This can be done over Modbus, or with Bright
Sensors’ Modbus USB Windows Interface Package.
Please refer to the Modbus manual for details on the registers affiliated with the current loop. To re-calibrate
the current loop via Modbus, please perform the following steps:
•Enable changes to the holding register by entering the passcode 27521 in holding register 50.
•Enter the integer 1 in holding register 32 to override the standard current loop operation.
•Enter an integer between 0 and 4096 in holding register 33. Measure the current loop output of your
current loop system.
•Adjust the input integer (typically 800) in holding register 33 until the measured current equals 4 mA.
Enter the final input integer in holding register 30.
•Adjust the input integer (typically 4000) in holding register 33 until the measured current equals 20
mA. Enter the final input integer in holding register 31.
•Enter the value 0 in holding register 32 to restart the standard current loop operation.
•The current loop has now been calibrated for your system. The calibration values from the steps
above are now visible in input registers 64 and 65, for the 4 mA setpoint and 20 mA setpoint,
respectively.
•Finally, disable further changes to the holding register by saving value 0 to holding register 50.
For details on how to calibrate the current loop using Bright Sensors’ Modbus USB Windows Interface
Package, please consult the GUI (graphical use interface) manual to be found here: https://www.bright-
sensors.com/blueeye-ex-d/.

Bright Sensors SA All Right Reserved © 2021
20
3.5Combustion and Metering reference conditions
Combustion and Metering Reference conditions are varying by geographical location and application.
Combustion reference conditions are specified as: temperature, t1, and pressure, p1, at which the fuel is
notionally burned. Metering reference conditions are specified as: temperature, t2, and pressure, p2, at
which the volume of fuel to be burned is notionally determined. There is no a priori reason for the metering
reference conditions to be the same as the combustion reference conditions. In the BlueEye™Ex-D the
following reference conditions can be selected: 0/0°C, 15/0°C, 15/15°C, 20/20°C, 25/20°C at 101325 Pa and
60°F at 14.65 psi, 14.696 psi, 14.73 psi and 15.025 psi absolute.
Figure 8: Calorific value on a volume basis –Metering and combustion reference conditions
Figure 9: Reference conditions according to ISO 6976
The BlueEye™Ex-D expresses the combustion properties in all generally used metering and reference
conditions. Please ensure the correct reference conditions are selected to avoid structural offset between
BlueEye™Ex-D output and comparing values.