Industrial Scientific Radius BZ1 User manual

Product
Manual
The Essential Guide for
Safety Teams and
Instrument Operators
Edition 2
August 25, 2016
Part Number: 17155915-1

Industrial Scientific Corporation, Pittsburgh, PA USA
Industrial Scientific Co., Ltd. Shanghai, China
© 2016 Industrial Scientific Corporation
All rights reserved. Published 2016.
Version 3
www.indsci.com/radius

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Contents
General Information........................................................................................... 1
Certifications ................................................................................................. 1
Warnings and Cautionary Statements........................................................... 2
Recommended Practices .............................................................................. 4
First-use Checklist .................................................................................... 4
Placement Guidelines............................................................................... 5
Maintenance............................................................................................. 5
Settings ................................................................................................ 6
Utilities.................................................................................................. 6
Remote Sampling ..................................................................................... 8
Care and Storage ..................................................................................... 8
Product Information ......................................................................................... 11
Overview ..................................................................................................... 11
Key Features............................................................................................... 11
Modularity............................................................................................... 11
Power ..................................................................................................... 12
Wireless.................................................................................................. 12
Messaging .............................................................................................. 12
Compatibilities............................................................................................. 13
Batteries and Power Supplies................................................................. 13
Sensors .................................................................................................. 13
Docking Station and Software ................................................................ 14
Sample Tubing ....................................................................................... 14
Specifications.............................................................................................. 15
Instrument............................................................................................... 15
Batteries ................................................................................................. 16
Sensors .................................................................................................. 17
Getting Started ................................................................................................ 25
Unpacking ................................................................................................... 25
Hardware Overview..................................................................................... 26
Setup........................................................................................................... 29
Display Overview (operation) ...................................................................... 30
Settings ........................................................................................................... 35
Guidelines ................................................................................................... 35

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Accessing and Protecting Settings.............................................................. 35
Settings Overview ....................................................................................... 36
Display Overview (settings)......................................................................... 37
Working in Settings ..................................................................................... 39
Reviewing and Editing Settings................................................................... 40
Maintenance Options and Settings......................................................... 41
Start-up Settings..................................................................................... 42
Operation Settings.................................................................................. 42
Alarm Settings ........................................................................................ 44
Sensor Settings ...................................................................................... 46
Admin Settings ....................................................................................... 47
Wireless Settings.................................................................................... 49
Power .............................................................................................................. 53
Charging the Battery ................................................................................... 53
Power on ................................................................................................ 54
Shutdown................................................................................................ 57
Quick-status Information .................................................................... 57
Maintaining Battery Charge......................................................................... 58
Operation......................................................................................................... 61
Placing the Instrument ................................................................................ 61
In-field Precautions ..................................................................................... 61
Gas Readings ............................................................................................. 62
Operating the Instrument ............................................................................ 63
Information.............................................................................................. 63
Utilities.................................................................................................... 63
Alarms, Warnings, and Indicators ............................................................... 65
Alarms .................................................................................................... 65
Warnings ................................................................................................ 68
Indicators................................................................................................ 69
Resolving Failures and Errors..................................................................... 70
Maintenance.................................................................................................... 73
Overview ..................................................................................................... 73
Guidelines ................................................................................................... 73
Process At-a-glance.................................................................................... 73
Supplies and Preparation............................................................................ 74
Instruction.................................................................................................... 75

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Service and Warranty...................................................................................... 79
Service ........................................................................................................ 79
Guidelines............................................................................................... 79
Supplies.................................................................................................. 80
Instruction............................................................................................... 80
Warranty...................................................................................................... 87
Limitation of Liability ............................................................................... 87
Appendix A...................................................................................................... 89
Supplemental Information about Gases and Sensors................................. 89
Cross Sensitivity and Toxic Gases ......................................................... 89
LEL and Combustible Gases.................................................................. 90
Appendix B...................................................................................................... 92
Supplemental information about the Intrinsic Safety External Power Supply
.................................................................................................................... 92

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Tables and Figures
Table 1.1 Hazardous area certifications ............................................................ 1
Table 1.2 Wireless certifications........................................................................ 2
Table 1.3 Warnings and cautionary statements ................................................ 2
Figure 1.1 Sample placement plan for instruments in a LENS group................ 5
Table 1.4 Recommended frequencies for instrument maintenance .................. 8
Table 2.1 Compatible batteries and power supplies........................................ 13
Figure 2.1 Compatible sensors and installation locations................................ 14
Table 2.2 Instrument specifications ................................................................. 15
Table 2.3 Battery specifications....................................................................... 16
Table 2.4 Intrinsic Safety External Power Supply specifications ..................... 16
Table 2.5 Sensor specifications....................................................................... 17
Table 3.1 Package contents............................................................................ 25
Figure 3.1.A Hardware overview Radius BZ1 (front view; diffusion)................ 27
Figure 3.1.B Hardware overview Radius BZ1 (back view; aspirated).............. 28
Figure 3.2 Setup.............................................................................................. 29
Figure 3.3 Display-screen overview during operation...................................... 33
Table 4.1 Settings overview ............................................................................ 36
Figure 4.1 Display screen overview in settings................................................ 38
Figure 4.2 Example for editing a single-step setting........................................ 39
Figure 4.3 Example for editing a multistep setting........................................... 40
Table 4.2 Maintenance options and settings ................................................... 41
Table 4.3 Start-up settings .............................................................................. 42
Table 4.4 Operation settings ........................................................................... 43
Table 4.5 Alarm settings.................................................................................. 44
Table 4.6 Sensor settings................................................................................ 46
Table 4.7 Admin settings................................................................................. 47
Table 4.8 Wireless settings ............................................................................. 50
Figure 5.1 Battery charging instruction............................................................ 54
Figure 5.2 Power-on process .......................................................................... 57
Figure 5.3 Shut-down process......................................................................... 57
Figure 5.4 Intrinsic Safety External Power Supply Placement Restrictions..... 58

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Figure 5.5 Connecting the Intrinsic Safety External Power Supply.................. 59
Figure 5.6 Disconnecting the Intrinsic Safety External Power Supply ............. 60
Figure 6.1 Operation instruction ...................................................................... 65
Figure 6.2 Alarm-signal intensity ..................................................................... 66
Figure 6.3 Alarm and peer-alarm display-screen samples .............................. 66
Figure 6.4 Alarms, possible causes, and relative signal intensity.................... 67
Example: Peer instruments with one in high alarm ..................................... 68
Figure 6.5 Warning display-screen samples.................................................... 69
Table 6.1 Warnings and indicators; causes and signal frequency................... 69
Table 6.1 Failures and errors .......................................................................... 71
Figure 7.1 Maintenance supplies and preparation........................................... 74
Figure 7.2.A Zeroing instruction ..................................................................... 75
Figure 7.2.B Calibration instruction ................................................................. 76
Figure 7.2.C Bump test instruction .................................................................. 77
Figure 8.1 Parts diagram for SafeCore Module and Radius Base................... 80
Table 8.1 Parts table for SafeCore Module and Radius Base ......................... 80
Figure 8.2 Service tasks, Radius Base............................................................ 84
Figure 8.3 Service tasks, SafeCore Module .................................................... 86
Table A.1 Cross-sensitivity guidelines (%) ..................................................... 89
Table A.2 LEL correlation factors ................................................................... 90
Figure B.1.A Drawing 1810D9387-200 (left).................................................... 92
Figure B.1.B Drawing 1810D9387-200 (right) ................................................. 93

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General Information
Certifications
Warnings and Cautionary Statements
Recommended Practices
Certifications
Radius™ BZ1 Area Monitors can be manufactured to meet a variety of
certifications including those listed below in Tables 1.1 and 1.2. To determine
the hazardous area classifications for which an instrument is certified, refer to
its label or the instrument order.
Table 1.1 Hazardous area certifications
Certifying Body
Area Classifications
Approved
Temperature
Range
ATEX
Ex da ia IIC T4 Ga, Equipment Group
and Category II 1G
Ex db ia IIC T4 Gb with IR sensor
installed, Equipment Group and
Category II 2G
-20 °C to +55 °C
(-4 °F to + 131 °F)
CSAa
Class I, Division 1, Groups A, B, C, and
D; T4
-20 °C to +55 °C
(-4 °F to +131 °F)
Ex da ia IIC T4 Ga
-20 °C to +55 °C
(-4 °F to +131 °F)
C22.2 No. 152 applies only to %LEL
thermo-catalytic reading
-20 °C to +55 °C
(-4 °F to +131 °F)
IECEx
Ex da ia IIC T4 Ga
Ex db ia IIC T4 Gb with IR sensor
installed
-20 °C to +55 °C
(-4 °F to + 131 °F)

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Table 1.1 Hazardous area certifications
Certifying Body
Area Classifications
Approved
Temperature
Range
UL
Class I, Division 1, Groups A, B, C, and D;
T4
Class 1 Zone 0 AEx da ia IIC T4 Ga
Class 1 Zone 0 AEx db ia IIC T4 Gb with
IR sensor installed
-20 °C to +55 °C
(-4 °F to + 131 °F)
aThe following apply to instruments that are to be used in compliance with the CSA certification:
Radius BZ1 Area Monitor is CSA-certified according to the Canadian Electrical Code for use in Class I,
Division 1 and Zone Classified Hazardous Locations within an ambient temperature range of Tamb: -20
°C to +55 °C.
CSA has assessed only the %LEL thermo-catalytic combustible gas detection portion of this instrument
for performance according to CSA Standard C22.2 No. 152 within an ambient temperature range of
Tamb: -20 °C to +55 °C. This is applicable when the monitor is used in the diffusion or aspirated mode
and has been calibrated to 50% LEL CH4.
Table 1.2 Wireless certifications
Agency or
authority
Identification number or
registration number
Country or region
FCCa
FCC ID: U9O–SM220
USA
ICa
IC: 7084–SM220
Canada
TRA
TRA/TA-R/3210/16
Oman
ictQATAR
CRA/SA/2016/R-5371
Qatar
iDA
G1598-16
Singapore
TRA
ER46539/16
U.A.E.
aMarking requirements INDUSTRIAL SCIENTIFIC CORP.; SAFECORE MODULE; Contains SM220
FCC ID: U9O-SM220; IC: 7084A-SM220
Warnings and Cautionary Statements
Read and understand this "Product Manual" before operating or servicing the
instrument. Failure to perform certain procedures or note certain conditions—
provided in Table 1.3 and throughout the manual—may impair the performance
of the product, cause unsafe conditions, or both.
Table 1.3 Warnings and cautionary statements
If it appears that the instrument is not working correctly, immediately contact
Industrial Scientific.
For safety reasons, this equipment must be operated and serviced by qualified

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Table 1.3 Warnings and cautionary statements
personnel only.
Pour des raisons de sécurité, cet équipement doit être utiles entretenu et réparé
uniquement par un personnel qualifié.
WARNING: SUBSTITUTION OF COMPONENTS MAY IMPAIR INTRINSIC
SAFETY.
AVERTISSEMENT: LA SUBSTITUTION DE COMPOSANTS PEUT
COMPROMETTRE LA SÉCURITÉ INTRINSÈQUE.
Do not use in oxygen-enriched atmospheres. If the atmosphere becomes
oxygen enriched, it may cause inaccurate readings.
Oxygen-deficient atmospheres may cause inaccurate readings.
Sudden changes in atmospheric pressure may cause temporary fluctuations in
gas readings.
A rapid increase in a gas reading that is followed by a declining or erratic reading
may indicate an over-range condition, which may be hazardous.
Silicone and other known contaminants may damage the instrument's
combustible gas sensors, which can cause inaccurate gas readings.
Do not use solvents or cleaning solutions on the instrument or its components.
To support accurate readings, keep clean and unobstructed all filters, ports, and
water barriers.
Perform all instrument service tasks in nonhazardous locations only. A service
task is defined as the removal, replacement, or adjustment of any part on or
inside the SafeCore Module™or Radius Base. Always power off the instrument
before performing any service task.
Perform the maintenance procedures of zeroing, calibration, and bump testing in
nonhazardous locations only.
The Radius Base battery pack must be fully charged before its first use.
Do not connect or use the Radius Base charging port in hazardous-classified
locations. The port cover must be installed when the instrument is in a
hazardous-classified location.
WARNING - DO NOT CHARGE THE BATTERY IN HAZARDOUS LOCATION.
AVERTISSEMENT - NE PAS CHARGER L'ACCUMULATEUR DANS UN
EMPLACEMENT DANGEREUX.
Charge the Radius Base battery pack only in nonhazardous locations using
compatible accessories from Industrial Scientific.
The Radius Base battery pack is to be replaced only by Industrial Scientific
Corporation or authorized repair facility.
Before using the Intrinsic Safety External Power Supply accessory, read and
understand control drawing 1810D9387-200. See "Appendix B, Supplemental
Information about the Intrinsic Safety External Power Supply."
When the Intrinsic Safety External Power Supply is not in use and the instrument
is placed in hazardous-classified locations, the Radius Base power-supply port
cap must be installed.

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Table 1.3 Warnings and cautionary statements
Contains wireless device model SM220, FCC ID: U9O-SM220. This device
complies with Part 15 of the FCC Rules. Operation is subject to the following two
conditions: (1) This device may not cause harmful interferences, and (2) this
device must accept any interference received, including interference that may
cause undesired operation.
This equipment has been tested and found to comply with the limits for a Class A
digital device, pursuant to part 15 of the FCC Rules. These limits are designed to
provide reasonable protection against harmful interference when the equipment
is operated in a commercial environment. This equipment generates, uses, and
can radiate radio frequency energy and, if not installed and used in accordance
with the instruction manual, may cause harmful interference to radio
communications. Operation of this equipment in a residential area is likely to
cause harmful interference in which case the user will be required to correct the
interference at his own expense.
The instrument complies with part 15 of the FCC Rules. Operation is subject to
the following two conditions:
This device may not cause harmful interference.
This device must accept any interference received, including interference
that may cause undesired operation.
Changes or modification made that are not expressly approved by the
manufacturer could void the user’s authority to operate the equipment.
RF Exposure: This equipment complies with FCC radiation exposure limits set
forth for an uncontrolled environment. This equipment should be installed and
operated with minimum distance 20 cm between the radiator and your body. This
transmitter must not be co-located or operating in conjunction with any other
antenna or transmitter.
This device complies with Industry Canada license-exempt RSS standard(s).
Operation is subject to the following two conditions: (1) this device may not cause
interference, and (2) this device must accept any interference, including
interference that may cause undesired operation of the device.
Le présent appareil est conforme aux CNR d'Industrie Canada applicables aux
appareils radio exempts de licence. L'exploitation est autorisée aux deux
conditions suivantes : (1) l'appareil ne doit pas produire de brouillage, et (2)
l'utilisateur de l'appareil doit accepter tout brouillage radioélectrique subi, même
si le brouillage est susceptible d'en compromettre le fonctionnement.
Recommended Practices
First-use Checklist
To prepare the Radius BZ1 instrument for first use, qualified personnel should
ensure the following are completed:
Instrument setup.
Charge the battery.
Review instrument settings and adjust them as needed.

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Calibrate the instrument.
Complete a bump test.
Train instrument users.
Placement Guidelines
To develop a placement plan for each unique, in-field application of Radius
BZ1 instruments, keep in mind all relevant gas, site, and LENS™ Wireless
(Linked Equipment Network for Safety) factors, which include but are not
limited to the following:
Know the densities of the target gases.
Know or anticipate as much as possible the locations of potential leaks
and other prospective gas events.
Consider the site's air temperature and its air-flow factors such as velocity
and direction.
Consider the site's terrain.
For instruments that are set to perform in a LENS Wireless peer group, be
aware that LENS communicates in a nonlinear manner. With the
placement of units A through F as shown below in Figure 1.1, messages
can travel among instruments that may be separated by a structure (gray
bar).
When using LENS Wireless, ensure each instrument is assigned to the
desired peer group; create the placement plan to account for each
instrument being within range of at least one other instrument in its group.
As needed, supervise the in-field placement of instruments (see chapter 6,
"Operation").
Figure 1.1 Sample placement plan for instruments in a LENS
group
Maintenance
The procedures defined below help to maintain instrument functionality and
support operator safety. They also help manage for the effects of sensor drift.

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Sensor drift is defined as a gradual shift in sensor output, which causes an
error in the displayed gas reading. The shift can be either positive or negative
and is typically caused by the conditions listed below.
There are changes in environmental conditions such as temperature,
pressure, humidity, or thermal conductivity of the air.
The sensor has cross sensitivity* to nontarget gases and has been directly
exposed to one or more of those gases, or is experiencing lingering,
temporary effects from this type of exposure.
The sensor has been zeroed or calibrated in an atmosphere that contains
some concentration of the sensor's target gas or some concentration of
nontarget* gas to which the sensor responds.
There are changes in the power state of a biased sensor. Biased sensors
require continuous power and may take a while to stabilize after being in a
state of low or no power. Biased sensors installed in the Safecore Module
are powered only by the module's "backup battery" when the module is out
of the Radius Base or docking station. When the module is returned to the
docking or Radius Base, there will be a warm-up period.
*For more information about the cross sensitivities of nontarget gases see "Appendix A,
Supplemental Information about Gases and Sensors."
Industrial Scientific minimum-frequency recommendations for instrument
maintenance are summarized below in Table 1.4. These recommendations are
provided to help support worker safety and are based on field data, safe work
procedures, industry best practices, and regulatory standards. Industrial
Scientific is not responsible for determining a company’s safety practices or
establishing its safety policies, which may be affected by the directives and
recommendations of regulatory groups, environmental conditions, operating
conditions, instrument use patterns and exposure to gas, and other factors.
Settings
Settings control how an instrument will perform. They are used to support
compliance with company safety policy and applicable regulations, laws, and
guidelines as issued by regulatory agencies and government or industry
groups.
Utilities
Maintenance procedures are known as "utilities." Utilities are used to test the
instrument or its components for functionality or performance, or to complete
other maintenance tasks. Each utility is defined below.
Self-test.
The self-test checks the functionality of the instrument’s memory operations,
battery, display screen, and each alarm-signal type (audible and visual).

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Bump Test* (or "functional test").
Bump testing is a functional test in which an instrument's installed sensors are
to be briefly exposed to (or “bumped” by) calibration gases in concentrations
that are greater than the sensors’ low-alarm setpoints. This will cause the
instrument to go into low alarm and will indicate which sensors pass or fail this
basic test for response to gas.
Zero*.
Zeroing adjusts the sensors’ “baseline” readings, which become the points of
comparison for subsequent gas readings. It is a prerequisite for calibration.
During zeroing, the installed sensors are to be exposed to an air sample from a
zero-grade-air cylinder or ambient air that is known to be clean air. If there are
gases in the air sample that are below the lowest alarm level, the instrument
will read them as zero; its task is to read the air sample as clean air. The user's
task is to ensure the air is clean.
Calibration*.
Regular calibrations promote the accurate measurement of gas concentration
values. During calibration, an instrument’s installed sensors are to be exposed
to their set concentrations of calibration gases. Based on the sensors’
responses, the instrument will self-adjust to compensate for declining sensor
sensitivity, which occurs as the installed sensors are used or “consumed."
Note: After calibration, the span reserve percentage value for each sensor is displayed. An
indicator of a sensor's remaining life, when the value is less than 50%, the sensor will no longer
pass calibration.
Docking.
When docked, instruments that are supported by iNet® Control or DSSAC
(Docking Station Software Admin Console) will be be maintained for all
scheduled bump tests and calibrations, synchronized for any changes to
settings, and upgraded for improvements from Industrial Scientific.
Other Maintenance.
The time-weighted average (TWA), short-term exposure limit (STEL), and peak
readings can each be "cleared." When any summary reading is cleared, its
value is reset to zero and its time-related setting is also reset to zero.
*Complete only in an areas known to be nonhazardous.

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Table 1.4 Recommended frequencies for instrument
maintenance
Procedure
Recommended minimum frequency
Settings
Before first use, when an installed sensor is replaced, and as
needed.
Zero
Before first use; thereafter, zero the instrument every two weeks or
when sensor drift is observed.
Calibrationa
Before first use and monthly thereafter.
Bump testb
Before first use; thereafter, for sensors not operating on
DualSense™, prior to each day’s use and, for sensors operating on
DualSense, as needed between monthly calibrations.
Self-testc
As needed.
aBetween regular calibrations, Industrial Scientific also recommends a calibration be performed
immediately following each of these incidences: the unit falls, is dropped, or experiences another
significant impact; fails a bump test; has been repeatedly exposed to an over-range (positive or
negative) gas concentration; or its sensors are exposed to water or contaminants. A calibration is
also recommended after the installation of a new or replacement sensor.
bIf conditions do not permit daily bump testing, the procedure may be done less frequently based
on instrument use, potential exposure to gas, and environmental conditions as determined by
company policy and local regulatory standards.
bWhen redundant sensors are operating on DualSense technology, bump testing these sensors
may be done less frequently based on company safety policy.
cThe instrument performs a self-test during power on. When the instrument remains on, it will
complete a self-test during each 12-hour period. The self-test can also be completed on demand
through settings.
Note: The use of calibration gases not provided by Industrial Scientific may void product
warranties and limit potential liability claims.
Remote Sampling
When sampling with the aspirated Radius BZ1, allow time for the air sample to
reach the sensors and for the sensors to respond to any gases that are
present. Industrial Scientific recommends the allowance of two minutes plus
two seconds for each 30 cm (12 ") of sample tubing.
Care and Storage
Periodic inspection of the instrument can identify some care and service needs.
Inspect dust and water barriers and replace them if visibly dirty or clogged.
Connectors, including the SafeCore Module connector, can be cleaned
using compressed air.

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The Radius Base can be wiped clean with a damp cloth. Isopropyl alcohol
70% can be used for cleaning, but do not use acetone or other products as
they may damage the plastic. Do not use cleaning products that contain
silicone as they can contaminate the sensors.
Fully charge the Radius Base battery pack before long-term storage.
Industrial Scientific recommends the SafeCore Module be stored in the
Radius Base; this will help support conservation of the backup battery, a
power source that maintains the module's clock and is needed when
biased sensor are installed.
Note: Prolonged exposure to moisture may cause the equipment to experience slight coloration
changes. These changes do not impact the performance, integrity, or characteristics of the
materials.

2
Product Information
Overview
Key Features
Compatibilities
Specifications
Overview
The Radius™ BZ1 Area Monitor is a multigas area monitor (instrument) that
can provide readings for up to seven gases simultaneously. With its fifteen
compatible sensors, the instrument is capable of monitoring for oxygen and a
variety of toxic gases and combustible gases. The Radius BZ1 is used
outdoors and indoors for applications that require a worker or worksite
perimeter, a fence-line setup, a standalone unit, and confined-space
monitoring.
Key Features
Modularity
The Radius BZ1 Area Monitor consists of the SafeCore Module and Radius
Base.
When installed in the Radius Base, the SafeCore Module, serves as the
instrument's central processing unit. It houses the gas sensors, electronics,
firmware, data log, settings, wireless radio, clock and clock battery, and the
pump (aspirated instruments only). The module is in-field replaceable. It is also
is removable for maintenance and service—tasks that are to be performed in a
nonhazardous area.
The Radius Base houses the long-life, extended-run-time, rechargeable battery
pack that powers the instrument. The Radius Base also serves as the user
interface and comprises the instrument's buttons, display, and visual and
audible alarm-warning-indicator signals.

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Power
When the instrument is not in use, the battery pack can be charged in a
nonhazardous environment using the product's power supply and power cord.
When the instrument is in use, its charge can be maintained using the
product's optional accessory, the Intrinsic Safety External Power Supply and its
cable*.
Wireless
Radius BZ1 instruments can be equipped with LENS Wireless, a long-range,
power-efficient wireless mesh network from Industrial Scientific.
LENS functionality enables instrument-to-instrument, or peer-to-peer,
communications. It uses a group feature to facilitate the wireless connection of
specific instruments. Each instrument is readily assigned to a peer group
through its settings.
LENS supports up to ten groups and each group can accommodate from 2 to
25 instruments. When two or more gas detection instruments are set to
perform in a specified peer group—and each is within range of any other
instrument in that group—they share their alarms and gas readings. This
allows in-field personnel to learn of and respond to hazardous gas conditions
that are detected by any instrument within a group.
Data communicated using LENS Wireless are secured with the Industrial
Scientific encryption key. LENS also allows the customer to optionally use its
own custom encryption key**. LENS functionality requires no central controller,
network configuration, or infrastructure.
Messaging
Radius BZ1 instruments give the safety team a variety of options to provide
instrument operators with customized on-screen messages**. This includes a
custom start-up message, which displays during the power-on process. A
unique instructional message, or "alarm action message", can be set for each
of these gas events for each sensor: gas present (low alarm and high alarm),
STEL, and TWA. These messaging options provide opportunities for the safety
team to communicate specific instructions to the instrument operator.
*Some restrictions apply.
**Requires iNet® Control or DSSAC (Docking Station Software Admin Console) from Industrial
Scientific.