OleumTech WT H2S Series User manual
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WIRELESS H2S TRANSMITTER (WT SERIES) - USER GUIDE
OleumTech® OTC Wireless Sensor and I/O Network
Wireless Hydrogen Sulfide (H2S) Transmitter
Class I, Division 1 (Zone 0)
Standard Model Number: WT-0900-H2S | WT-0915-H2S | WT-2400- H2S | WT-0868-H2S
Model Number with Alarm Outputs: WT-0900-H2S-A | WT-0915-H2S-A | WT-2400- H2S-A | WT-0868-H2S-A
User Guide
Document Rev #: 80-7090-001_A
WT-xxxx-H2S WT-xxxx-H2S-A
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WIRELESS H2S TRANSMITTER (WT SERIES) - USER GUIDE
Table of Contents
1. SAFETY, CERTIFICATIONS, COMPLIANCE............................................................ 3
2. PRODUCT OVERVIEW ....................................................................................... 10
3. HARDWARE OVERVIEW.................................................................................... 11
4. NETWORKING DIAGRAM.................................................................................. 13
5. TECHNICAL SPECIFICATIONS ............................................................................ 14
6. REQUIRED ITEMS FOR BASIC SETUP................................................................. 15
7. BATTERY PACK.................................................................................................. 16
8. SENSOR ASSEMBLY / MODULE REPLACEMENT................................................ 18
9. SENSOR CALIBRATION...................................................................................... 19
10. INSTALLATION.............................................................................................. 21
11. WIRING, WT-H2S-A ONLY ............................................................................ 22
12. GROUNDING RECOMMENDATIONS............................................................. 23
13. RF SETUP / RF SECURITY .............................................................................. 25
14. DOWNLOAD & INSTALL THE SOFTWARE ..................................................... 27
15. CREATE A PROJECT FILE USING THE SOFTWARE.......................................... 27
16. SOFTWARE MAIN SCREEN VIEW................................................................. 33
17. UPDATING THE TRANSMITTER – LCD METHOD........................................... 35
18. UPDATING THE TRANSMITTER – CABLE METHOD....................................... 41
19. CONNECTING TO THE TRANSMITTER VIA THE SOFTWARE.......................... 43
20. POLL MODBUS DATA FROM THE SOFTWARE .............................................. 45
21. PROGRAMMING/UPDATING THE WIRELESS GATEWAY .............................. 46
22. UPGRADING THE TRANSMITTER FIRMWARE............................................... 47
23. ERROR CODES .............................................................................................. 49
24. TROUBLESHOOTING..................................................................................... 50
25. GENERAL MAINTENANCE............................................................................. 55
26. LIMITED WARRANTY .................................................................................... 56
27. REVISION HISTORY....................................................................................... 57
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WIRELESS H2S TRANSMITTER (WT SERIES) - USER GUIDE
1. SAFETY, CERTIFICATIONS, COMPLIANCE
1. Safety
WARNING: Ensure the installation of the transmitter meets applicable
state and National Electrical Code requirements. For safety reason, the
WT-H2S must be operated and serviced by qualified personnel only. Read
and understand the User Guide in its entirety before operating or
servicing.
WARNING: The WT-H2S only monitors the immediate vicinity of
the sensor housing. A site survey must be performed to
determine the best location and quantity of transmitters.
Improper installation can lead to an undetectable gas leak which
could result in injury or loss of life.
WARNING: When connecting an external alarm device to the WT-
H2S in a hazardous area, ensure that the external device is
installed in accordance with Intrinsically Safe or non-incendive
field wiring practices.
CAUTION: It is important and recommended that calibration
occur as part of the installation process, and then on a regularly
basis, per your organization’s best practices policy, to ensure
proper functionality and a safe work environment.
WARNING: Replacement battery MUST ONLY be the 3.6 Volt Lithium
Battery Pack, SX1000-BP3, supplied by OleumTech. The use of any other
battery or battery packs may negatively affect device performance, void
the device warranty, and may result in an explosion.
WARNING: To prevent static discharge, wipe with damp cloth only.
WARNING: To prevent ignition of flammable or combustible atmospheres,
disconnect power before servicing.
WARNING: Although the transmitter is very durable, do not install it on
high vibration applications or where transmitter is subject to severe
mechanical shock.
CAUTION: Disconnect the battery when the device is not in use.
WARNING: Monitor battery power level and replace the Battery Pack as
soon as possible when it reaches ≤ 2.90 Vdc. If no replaced promptly, the
transmitter may not function properly.
WARNING: Verify that the atmosphere around the transmitter is
consistent with the appropriate hazardous location certifications.
CAUTION: All housing entries MUST be tightly SEALED using thread seal
tape or sealant. Failure to seal all port entries may allow moisture to enter
the transmitter housing, cause damage to internal components, and void
warranty.
CAUTION: All housing covers MUST be tightly fastened to protect against
external environmental elements.
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WIRELESS H2S TRANSMITTER (WT SERIES) - USER GUIDE
Sécurité
AVERTISSEMENT: assurez-vous que l'installation du transmetteur est
conforme aux exigences de l'état et du code électrique national
applicables. Pour des raisons de sécurité, le WT-H2S doit être utilisé et
entretenu uniquement par du personnel qualifié. Lisez et comprenez le
guide de l'utilisateur dans son intégralité avant d'utiliser ou de réparer.
AVERTISSEMENT: le WT-H2S surveille uniquement la proximité immédiate
du boîtier du capteur. Une étude du site doit être effectuée pour
déterminer le meilleur emplacement et la meilleure quantité d'émetteurs.
Une mauvaise installation peut entraîner une fuite de gaz indétectable qui
pourrait entraîner des blessures ou la mort.
AVERTISSEMENT: Lors de la connexion d'un dispositif d'alarme externe au
WT-H2S dans une zone dangereuse, assurez-vous que le dispositif externe
est installé conformément aux pratiques de câblage de terrain à sécurité
intrinsèque ou non incendiaire.
ATTENTION: Il est important et recommandé que l’étalonnage se produise
dans le cadre du processus d’installation, puis régulièrement,
conformément à la politique des meilleures pratiques de votre
organisation, afin de garantir un bon fonctionnement et un environnement
de travail sûr.
AVERTISSEMENT: Batterie de remplacement ne doit être la Volt Lithium
Battery Pack 3.6, SX1000 - BP3, fourni par OleumTech. L'utilisation d'autres
batteries ou batterie peut affecter négativement les performances de
l'appareil, la garantie de l'appareil vide, et peut entraîner une explosion.
AVERTISSEMENT: Pour éviter une décharge statique, essuyer avec un
chiffon humide.
AVERTISSEMENT: Pour éviter l'inflammation d'atmosphères inflammables
ou combustibles, débrancher l'alimentation avant l'entretien.
AVERTISSEMENT: Bien que l’émetteur soit très durable, ne l’installez pas
sur des applications soumises à de fortes vibrations ou lorsque l’émetteur
est soumis à des chocs mécaniques importants.
ATTENTION: surveillez le niveau de charge de la batterie et remplacez le
bloc-batterie dès que possible lorsqu'il atteint ≤ 2,90 Vcc. S'il n'est pas
remplacé rapidement, l'émetteur peut ne pas fonctionner correctement.
AVERTISSEMENT: Vérifiez que l'atmosphère autour de l'émetteur est
conforme aux certifications appropriées pour les zones dangereuses.
ATTENTION: Toutes les entrées du boîtier DOIVENT être hermétiquement
scellées à l'aide d'un ruban d'étanchéité pour filetage ou d'un produit
d'étanchéité. Le fait de ne pas sceller toutes les entrées des ports peut
permettre à l'humidité de pénétrer dans le boîtier du transmetteur,
endommager les composants internes et annuler la garantie.
ATTENTION: Tous les couvercles de boîtier DOIVENT être fermement
fixés pour se protéger des éléments environnementaux externes.
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WIRELESS H2S TRANSMITTER (WT SERIES) - USER GUIDE
2. Certifications
EMC/EMI
∙ FCC Part 15 (USA)
∙ IC ICES-003 (Canada)
Safety
∙ Class I, Division 1, Groups A, B, C, D T3C; Ex ia IIC T3
∙ Class I, Zone 0; AEx ia IIC T3
∙ ATEX: Sira 13ATEX2142X; Ex ia IIC T3 Ga; II 1 G
∙ IECEx: SIR 13.0054X; Ex ia IIC T3 Ga
Amb. Temp.
∙ Ta = -40 to 50 °C (-40 to 122 °F)
Review Product Certifications for any restrictions associated
with a safe installation.
The certification marking shall be as detailed on drawing number 67-3305-00X
below:
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WIRELESS H2S TRANSMITTER (WT SERIES) - USER GUIDE
3. Intrinsic Safety Control Drawings
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WIRELESS H2S TRANSMITTER (WT SERIES) - USER GUIDE
4. Special Instructions for Use
a. ATEX/IECEx
i. The enclosure is manufactured from aluminum. In rare cases,
ignition sources due to impact and friction sparks could occur.
This shall be considered during installation, particularly if the
equipment is installed in a Zone 0 location.
ii. Under certain extreme circumstances, the exposed non-metallic
antenna cover may store an ignition-capable level of electrostatic
charge. Therefore, the user/installer shall implement precautions
to prevent the buildup of electrostatic charge, e.g. locate the
equipment where a charge-generating mechanism (such as wind-
blown dust) is unlikely to be present and clean with a damp cloth.
The enclosure shall be earthed to the local metalwork.
Copies of Certificate of Compliance are available on
https://support.oleumtech.com (Look under Resources)
b. cCSAus
Equipment shall not be installed in gasoline or ethyl acetate
atmospheres.
5. EMC/EMI
a. Important Information to the User
•This device MUST be professionally installed only by a factory
representative or a trained authorized technician.
•Changes or modifications not expressly approved by the
manufacturer may void the user’s authority to operate the
equipment.
•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 interference, and 2) this device must accept any interference
received, including interference that may cause undesired operation.
•This product contains a FHSS (Frequency Hopping Spread Spectrum)
and FSK (Frequency Shifting Key) modulation RF transceiver for the
902-928 MHz ISM band, designed to meet FCC 15.247, and is used in
industrial control and monitoring applications.
•To reduce potential radio interference to other users, install and use
only the antenna supplied by the manufacturer to ensure successful
communications.
•The antenna is factory sealed and MUST NOT be modified by the
user.
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WIRELESS H2S TRANSMITTER (WT SERIES) - USER GUIDE
b. Compliances
i. FCC RF Exposure
To comply with FCC RF exposure compliance requirements, a
separation distance of at least 20 cm must be maintained between the
antenna of this device and all persons.
ii. FCC Compliance Statement
This equipment has been tested and found to comply with the limits
for a class B digital device, pursuant to Part 15 of the FCC Rules. These
limits are designed to provide reasonable protection against harmful
interference in a residential installation. This equipment generates,
uses and can radiate radio frequency energy and if not installed and
used in accordance with the instructions, may cause harmful
communications to radio communications. However, there is no
guarantee that interference will not occur in a particular installation. If
this equipment does cause harmful interference to radio or television
reception, which can be determined by turning the equipment off and
on, the user is encouraged to try to correct the interference by one of
the following measures:
Reorient or relocate the antenna.
Increase the separation between the equipment and receiver.
Consult the manufacturer for technical help.
This equipment has been certified to comply with the limits for a class
B computing device, pursuant to FCC Rules. In order to maintain
compliance with FCC regulations, shielded cables must be used with
this equipment. Operation with non-approved equipment or use of
unshielded cables is likely to result in interference to radio and
television reception. The user is cautioned that changes or
modifications made to the equipment without the approval of the
manufacturer could void the user’s authority to operate this
equipment.
c. Australia
The operator does not require a specific license issued by ACMA to
operate this equipment. It has been set up by the manufacturer to
meet the technical requirements of Class License and should be so
maintained.
The device shall be installed in such a manner that no member of the
general public can be closer than 20cm (0.2 m) from the antenna.
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WIRELESS H2S TRANSMITTER (WT SERIES) - USER GUIDE
CONFORMITÉ
Informations importantes à l'utilisateur
•Ce dispositif doit être installé par un professionnel que par un
représentant de l'usine ou par un technicien formé et autorisé.
•Les changements ou modifications non expressément approuvés par
le fabricant peuvent annuler l'autorité de l'utilisateur à utiliser
l'équipement.
•Cet appareil est conforme à la partie 15 des règles de la FCC. Son
fonctionnement est soumis aux deux conditions suivantes: 1) ce
dispositif ne doit pas causer d'interférences nuisibles et 2) cet
appareil doit accepter toute interférence reçue, y compris les
interférences qui peuvent causer un mauvais fonctionnement.
•Ce produit contient un FHSS (Frequency Hopping Spread Spectrum)
émetteur-récepteur RF pour la bande ISM 902-928 MHz en utilisant
FSK (Frequency Shifting Key) modulation, conçu pour répondre FCC
15.247, et est utilisé dans le contrôle industriel et les applications de
surveillance.
•Pour réduire les interférences radio potentielles aux autres
utilisateurs, installer et utiliser uniquement l'antenne fournie par le
fabricant pour assurer une communication réussie.
•L'antenne est scellé en usine et ne doit être modifié par l'utilisateur.
Exposition RF de la FCC
Pour se conformer à la FCC exigences de conformité de l'exposition, une
distance de séparation d'au moins 20 cm doit être maintenue entre
l'antenne de cet appareil et toutes les personnes.
Déclaration de Conformité FCC
Cet équipement a été testé et déclaré conforme aux limites d'un appareil
numérique de classe B, conformément à la partie 15 des règles de la FCC.
Ces limites sont conçues pour fournir une protection raisonnable contre les
interférences nuisibles dans une installation résidentielle. Cet équipement
génère, utilise et peut émettre de l'énergie radiofréquence et, si non
installé et utilisé conformément aux instructions, peut provoquer des
communications nuisibles aux communications radio. Cependant, il ne est
pas garanti que des interférences ne se produiront pas dans une
installation particulière. Si cet équipement provoque des interférences
nuisibles à la réception radio ou de télévision, ce qui peut être déterminé
en mettant l'équipement hors et sous tension, l'utilisateur est encouragé à
essayer de corriger l'interférence par une des mesures suivantes:
•Réorienter ou déplacer l'antenne.
•Augmenter la distance entre l'équipement et le récepteur.
•Consultez le fabricant de l'aide technique.
Cet équipement a été certifié conforme aux limites d'un dispositif
informatique de classe B, conformément aux règles de la FCC. Afin de
maintenir la conformité aux règlements de la FCC, des câbles blindés
doivent être utilisés avec cet équipement. L'utilisation d'équipement ou
l'utilisation de câbles non blindés non approuvé est susceptible d'entraîner
des interférences dans la réception radio et télévision. L'utilisateur est
averti que les changements ou modifications apportées à l'équipement
sans l'approbation du fabricant pourraient annuler l'autorité de l'utilisateur
à utiliser cet équipement.
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WIRELESS H2S TRANSMITTER (WT SERIES) - USER GUIDE
2. PRODUCT OVERVIEW
Integrated H2S Detection Solution
The OleumTech® OTC Wireless Hydrogen Sulfide (H2S) Gas Detection
Transmitters are self-contained, battery-powered solutions for continuously
monitoring air quality and generating alarms when H2S concentration levels
exceed user-configured setpoints. The H2S Transmitter integrates an
individually calibrated modular H2S sensor and can be replaced easily and
quickly. It also provides additional sensor maintenance tags like bump test
count, total days since last successful bump test and calibration. The H2S-A
option provides two solid state relay outputs for third-party device alarm
annunciation.
The local user interface allows for device configuration and instant data access.
Bump tests and alarm acknowledgments can be performed using just the
external scroll button.
Reliable, Scalable, and Safe
The field-proven wireless transmitters communicate with an assigned wireless
gateway within the OTC Wireless Sensor and I/O Network creating a highly
scalable network, accommodating virtually any I/O requirement. The
OleumTech wireless transmitters are Intrinsically Safe and certified for use in
Class I, Division 1 (Zone 0) hazardous locations.
The H2S Transmitters provide separate controllable transmit intervals for both
normal and alarm states. For exception reporting purposes, event-triggered
transmissions will be reported when going into or falling out of alarm states.
The alarm states are latchable.
Highlights
▪H2S measurement range: 0 to 100 ppm
▪Resolution: 0.1 ppm
▪Individually calibrated sensor module, replaceable
▪2 configurable alarm setpoints: high and high-high
▪2 alarm status DOs (Solid State Relay), WT-H2S-A option only
▪Field calibratable, 2 points (zero and custom: 10-50 ppm)
▪Bump tests and alarm acknowledgments can be performed using just the
external scroll button
▪Configurable transmit interval for when H2S is present
▪Dust/splash guard included
▪Provides helpful sensor maintenance tags such as total days since last
bump test and calibration
▪Advanced local LCD display interface
▪Self-contained, rugged design, battery-powered
▪IP66, -40 to 50 ˚C (-40 to 122 ˚F)
▪900 MHz / 915 MHz / 2.4 GHz / 868 MHz
▪Secure AES encryption
▪Class I, Division 1 (Zone 0), Intrinsically Safe
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WIRELESS H2S TRANSMITTER (WT SERIES) - USER GUIDE
3. HARDWARE OVERVIEW
1. Enclosure
All housing covers MUST be tightly fastened to protect against
external environmental elements.
All housing entries MUST be tightly SEALED using thread
seal tape or sealant. Failure to seal all port entries may
allow moisture to enter the transmitter housing, cause
damage to internal components, and void warranty.
Check the housing cover O-ring(s) every time the access cover is
removed.
- Apply lubricant if the O-ring is dry.
- Replace the O-ring when it is damaged, discolored, or showing
signs of wear.
- The O-ring should be seated firmly on the bottom of threads
without stretching to fit or without bulging.
The sensor must be calibrated on site prior to use due to
local geographical characteristics.
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WIRELESS H2S TRANSMITTER (WT SERIES) - USER GUIDE
2. Mounting Hardware
(2) M5 screws
(2) Adjustable mounting plates
(2) Washers
(2) Lock washers
Install the hardware in the order below for best results.
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WIRELESS H2S TRANSMITTER (WT SERIES) - USER GUIDE
4. NETWORKING DIAGRAM
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WIRELESS H2S TRANSMITTER (WT SERIES) - USER GUIDE
6. REQUIRED ITEMS FOR BASIC SETUP
Transmitter Setup
•WT Series H2S Transmitter: WT-xxxx-H2S or WT-xxxx-H2S-A
•Sensor Module, Part # SX1000-H2S (supplied with the transmitter)
•Dust/Splash Guard, optional (supplied with the transmitter)
•Use only SX1000-BP3 Transmitter Battery Pack (supplied with the
transmitter)
•Mounting hardware (supplied with the transmitter)
•Bump Test Kit, Part # SX1000-BTK (sold separately)
•External alarm device(s) for WT-H2S-A only and external power source
(sold separately)
•H2S gas canister for calibration/bump test (sold separately), ≤ 50 ppm max
Gateway Setup
•OTC Wireless Gateway (fully set up, refer to the specific User Guide)
oDH3
oDH1 or DH2
oDH2-W
•External power source for the wireless gateway (9-30 Vdc)
•External enclosure for the wireless gateway
Configuration Cable
•Optional All-in-One Configuration Cable (SX1000-CC2). The cable is not
required for local configuration via the local display interface.
Software and PC
•Latest BreeZ® Configuration Software (v7.1 and later)
•Latest gateway firmware
•Latest firmware package
•PC with:
oMicrosoft Windows® 7 or later
o1 GHz or faster processor
o1 GB or more RAM
o500 MB Hard Disk Space or more
oUSB or Serial port
Tools
•Screwdriver set
•Adjustable wrench
•10 mm hex wrench for 3/4” NPT plug removal, WT-H2S-A only
•Any other tools or equipment for proper installation
Internet Access
•Internet access required for downloading software and firmware
•Access to OleumTech OTC Download Center:
https://support.oleumtech.com
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WIRELESS H2S TRANSMITTER (WT SERIES) - USER GUIDE
7. BATTERY PACK
1. Installation
Internal battery power: 3.6 Vdc
The battery level is read under load.
Note: Once a new battery pack is installed, it is perfectly normal to get a
reading of 3.2 to 3.3 Vdc.
The transmitter reads the battery level while under load, providing a
reliable method of monitoring battery health. Using the RF Timeout, RF
Refresh and Battery Voltage tags are strongly recommended for
monitoring device and RF communication health.
When a new battery pack is taken from storage and initially installed, the
battery level may need to be read a couple of times to ensure a stable and
accurate reading.
Use only battery pack part number SX1000-BP3.
Disconnect the battery when the device is not in use.
Replace the battery pack when it reaches ≤ 2.90 Vdc.
Utilisez uniquement le numéro de pièce de la batterie SX1000-BP3.
Déconnecter la batterie lorsque l'appareil n'est pas utilisé.
Remplacez la batterie lorsqu'elle atteint ≤ 2.90 Vdc.
The transmitter contains a lithium battery pack. The lithium batteries are
regulated in transportation by the U.S. DOT (Department of Transportation)
and are also covered by IATA (International Air Transport Association), ICAO
(International Civil Aviation Organization), and ARD (European Ground
Transportation of Dangerous Goods). It is the responsibility of the shipper to
ensure compliance with these or any other local requirements. Consult current
regulations and requirements before shipping.
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WIRELESS H2S TRANSMITTER (WT SERIES) - USER GUIDE
2. Battery Life Expectancy
Users can set two separate reporting intervals: one for the normal
transmission cycle (> 60seconds) and the other being a faster burst mode
(between 30 and 60 seconds) when the transmitter is in an alarm state.
In addition, the H2S Transmitter continuously supplies power to the sensor
to monitor changes in H2S levels regardless of the reporting intervals.
Therefore, refer to the battery life expectancy data below to select the
most appropriate reporting interval for your application.
Tx Interval in Minutes
Tx Interval in Seconds
Battery Life (Years)
1
60
2.35
2
120
3.38
3
180
3.95
4
240
4.3
5
300
4.54
10
600
5.11
15
900
5.32
60
3600
5.67
Click here to view additional Battery Life Chart
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WIRELESS H2S TRANSMITTER (WT SERIES) - USER GUIDE
8. SENSOR ASSEMBLY / MODULE REPLACEMENT
Review Product Certifications for any restrictions associated with a safe
installation.
1. Set the Transmitter in Replace Sensor Mode
a.
2. Replacing the Sensor Module.
a. Remove the sensor housing cover.
b. Remove the sensor module. Attach the new sensor module by
properly aligning the pin connection.
c. Reassemble the sensor components.
i. Applying an anti-seize lubricant to the threads is recommended.
Do not obstruct the gas sensor port by making direct contact with
any tape or any other apparatus.
ii. Tighten the sensor housing by hand only.
d. Once the sensor has been replaced, restart the transmitter using the
LCD menu system.
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WIRELESS H2S TRANSMITTER (WT SERIES) - USER GUIDE
9. SENSOR CALIBRATION
The H2S Transmitter allows users to select the calibration gas concentration to
calibrate the H2S Sensor Module from 10 to 50 ppm in 5 ppm increments. The
transmitter can also calibrate the zero level.
Required Items
- H2S Transmitter
- Bump Test Kit, Part # SX1000-BTK (sold separately)
Housing Adapter
3/16” (ID) Barb
Removable Plug
18” Tubing
- H2S Gas Canister (sold separately), ≤50 ppm max
1. Assembly
a. Properly connect all the components together.
b. The red plug can be removed or remain connected. Follow your
organization’s best calibration practices.
The sensor must be calibrated on site prior to use due to
local geographical characteristics.
WARNING: Verify that gas concentration in the area has
dissipated to a safe level before performing a sensor
calibration, bump test, or clearing alarms.
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WIRELESS H2S TRANSMITTER (WT SERIES) - USER GUIDE
2. The H2S Sensor Module can Only be Calibrated via the
Transmitter’s LCD User Interface
Calibrating Zero Instructions
a. Enter the Config mode by holding down button F2 on the transmitter’s
LCD interface until 1.0 CONFIG appears on the screen.
b. Navigate to “calibrate zero?” in the menu system to calibrate the zero
value.
c. The user is given 600 seconds / 10 minutes to perform the calibration.
d. Once the gas concentration stabilizes and is within +/- 5 ppm of the
desired calibration level, use the SET function to set the level and save
the calibration.
e. You must “save cal” (F3) for the new calibration offset to take effect.
Calibrating Span Instructions
a. Enter the Config mode by holding down button F2 on the
transmitter’s LCD interface until 1.0 CONFIG appears on the
screen.
b. Navigate to “calibrate gas?” in the menu system and select the
desired ppm level.
c. The user is given 600 seconds / 10 minutes to perform the
calibration.
d. Once the gas concentration stabilizes and is within +/- 5 ppm of
the desired calibration level, use the SET function to set the level
and save the calibration.
e. You must “save cal” (F3) for the new calibration offset to take
effect.
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