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HOBO MX pH and Temperature Logger (MX2501) Manual 

 

 

U.S. and International Sales: 1-508-759-9500 

www.onsetcomp.com/support/contact 

© 2018–2022 Onset Computer Corporation. All rights reserved. Onset, HOBO, HOBOconnect, and HOBOlink are 
registered trademarks of Onset Computer Corporation. App Store, iPhone, iPad, and iPadOS are service marks or 
registered trademarks of Apple Inc. Android and Google Play are trademarks of Google LLC. Windows is a registered 
trademark of Microsoft Corporation. Bluetooth and Bluetooth Smart are registered trademarks of Bluetooth SIG, 
Inc. All other trademarks are the property of their respective companies. 

Patent #: 8,860,569 

22511-Q 

 

 

 

 

 

 

 

 

 

 

 

 

Federal Communication Commission Interference 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 interference 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 receiving antenna 

 

Increase the separation between the equipment and receiver 

 

Connect the equipment into an outlet on a circuit different from that to which the receiver is connected 

 

Consult the dealer or an experienced radio/TV technician for help 

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. 

FCC Caution: 

Any changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate this equipment. 

Industry Canada Statements

 

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. 

Avis de conformité pour l’Industrie Canada 

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'appareil doit accepter tout brouillage radioélectrique subi, même si le brouillage est susceptible d'en compromettre le 
fonctionnement. 

To comply with FCC and Industry Canada RF radiation exposure limits for general population, the logger must be installed to provide a separation distance of at least 20cm from 
all persons and must not be co-located or operating in conjunction with any other antenna or transmitter. 

NCC Statement 

經型式認證合格之低功率射頻電機,非經許可,公司、商號或使用者均不得擅自變更頻率、加大功率或變更原設計之特性及功能。 

低功率射頻電機之使用不得影響飛航安全及干擾合法通信;經發現有干擾現象時,應立即停用,並改善至無干擾時方得繼續使用。前項合法通信,指依電信法規定作
業之無線電通信。低功率射頻電機須忍受合法通信或工業、科學及醫療用電波輻射性電機設備之干擾。 

Translation: 

Article 12 

Without permission granted by the NCC, any company, enterprise, or user is not allowed to change frequency, enhance transmitting power or alter original characteristic as well 
as performance to an approved low power radio-frequency device. 

Article 14 

The low power radio-frequency devices shall not influence aircraft security and interfere with legal communications. If found, the user shall cease operating immediately until no 
interference is achieved. The said legal communications means radio communications is operated in compliance with the Telecommunications Act. The low power radio-
frequency devices must be susceptible with the interference from legal communications or ISM radio wave radiated devices. 

KC Statement 

해당

 

무선설비는

 

전파혼신

 

가능성이

 

있으므로

 

인명안전과

 

관련된

 

서비스는

 

 

 

없음 

Translation: 

The service related to human safety is not allowed because this device may have the possibility of the radio interference. 

 

Summary of Contents for MX2501

Page 1: ...ater Deionized water or water below 100 S cm may not be detected The water conductivity circuit may not reliably detect water that has frozen around the electrodes i e below 0 C 32 F Radio Power 1 mW...

Page 2: ...n Union EU See last page Logger Components and Operation Anti Biofouling Copper Guard Use this guard to protect the pH electrode when deploying the logger in water prone to biofouling see Deploying an...

Page 3: ...your mobile device or computer The range for successful wireless communication is approximately 30 5 m 100 ft in air with full line of sight Change the orientation of your device to ensure the antenn...

Page 4: ...2 If you removed the clear storage cap screw the closure cap onto the logger 3 In the HOBOconnect app tap Devices 4 Remove the logger from water If the logger was previously configured with Bluetooth...

Page 5: ...rt below of buffers and samples Temperature C F pH 4 01 Buffer pH 7 00 Buffer pH 10 00 Buffer 0 32 4 01 7 12 10 31 5 41 4 00 7 09 10 24 10 50 4 00 7 06 10 17 15 59 4 00 7 04 10 11 20 68 4 00 7 02 10 0...

Page 6: ...owing Cumulative The alarm trips once the sensor reading is out of the acceptable range for the selected duration any time during logging For example if the high alarm is set to 85 F and the duration...

Page 7: ...can be logged for each sensor The maximum or highest sampled value The minimum or lowest sampled value An average of all sampled values The standard deviation from the average for all sampled values...

Page 8: ...bration End pH calibration ended while the logger was logging Calibration Cancel pH calibration was canceled while the logger was logging Calibration Values The slope and offset values that were set d...

Page 9: ...solution with mild dishwashing soap Never touch the glass bulb inside the clear plastic end of the probe Always calibrate the logger after cleaning the pH electrode with anything other than distilled...

Page 10: ...logger immediately screw the closure cap back on the logger and follow the instructions in Calibrating the Logger If you will not be calibrating or deploying the logger immediately a Pour storage sol...

Page 11: ...8 Reinstall the battery holder and attached mounting end cap Use the alignment tab on the battery holder shown in step 4 and the arrow on the logger housing as a guide as you fit the small tab in the...

Page 12: ...ny interference received including interference that may cause undesired operation FCC Caution Any changes or modifications not expressly approved by the party responsible for compliance could void th...

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