Skip to search Skip to main content Skip to navigation

Welcome to our new website, found an issue or bug? Please report it here

We noticed you are from . Visit your local site for regional offers and live support.

MX2501-PH-Logger

HOBO MX Bluetooth Low Energy PH and Temperature Data Logger

Models In Stock
  • Bluetooth Low Energy 100-foot communications
  • Stores: 43,000 measurements
  • Accuracy of ± 0.10 pH units within ± 10°C of temperature at calibration
  • Multiple Start & Stop options
MX2501-PH-Logger
From C$ 1,181.78
Models In Stock
HOBO MX Bluetooth Low Energy PH and Temperature Data Logger MX2501-PH-Logger MX2501-PH-Logger
loading all models
Product Overview
  • Accuracy Note pH Sensor Accuracy: In pH: ± 0.10 pH units within ± 10°C of temperature at calibration, In mV: ± 0.20 mV
  • Additional Features 1 Submersible, Waterproof to 40 m
  • Approvals CE
  • Battery life 1 yr, typical with reading interval of 1 min
  • Battery Size and Type Alkaline AA
  • Buoyancy Fresh water: 0.48 oz Negative
  • Configuration HOBOmobile® app Android, iOS
  • Current Resolution Temperature: 0.1°C, 14 bit, Relative Humidity: 0.1%, 12 bit
  • Data Interface Bluetooth
  • Enclosure Ratings IP68
  • Form factor Hangging hole
  • Form Factor Note There are two mounting options:  Attach a nylon cord or other strong cable to the mounting hole to deploy the logger.
  • Height 1.68 in
  • Input Type Internal
  • Length 9 in
  • Logging Modes burst, Fixed interval
  • Materials Polycarbonate, TPV
  • Measurement Range Note pH in mV: -512 to 512 mV
  • Measurement Type pH, Temperature
  • Memory 152 KB
  • Memory Modes stop when full, Wrap when full
  • Memory Note Approximately 60 seconds; may take longer the further the device is from the logger
  • Operating Temperature, Max 50 °C
  • Operating Temperature, Min -2 °C
  • Operating Temperature Note -2° to 50°C — non-freezing
  • pH Accuracy ± 0.10 pH
  • Pressure Resolution Temperature: 0.1°C, 14 bit, Relative Humidity: 0.1%, 12 bit
  • Pulse Resolution Temperature: 0.1°C, 14 bit, Relative Humidity: 0.1%, 12 bit
  • Radio Power 1 mW
  • Resistance Resolution Temperature: 0.1°C, 14 bit, Relative Humidity: 0.1%, 12 bit
  • Resolution Note Temperature Sensor Resolution: 0.1°C, 14 bit, RH Resolution: 0.1%, 12 bit
  • Response Time Temperature: 7 Min, pH: 1 Min
  • Response Time Note Temperature: 7 Minutes typical to 90% in stirred water, pH: 1 Minute typical to 90% at constant temperature in stirred water
  • RH Resolution 0.1%, 12 bit
  • Samples,Max 43300 Samples, Interval Selectable 1 sec to 18hrs
  • Start Modes At set date and time, Button Push, Immediate Start, Next Interval
  • Stop Modes Button Push, When Memory is Full, At set date and time, At set Duration
  • Supply Power Note One AA 1.5 Volt, user-replaceable
  • Supply Power Type Battery
  • Temperature Accuracy ± 0.2 °C
  • Temperature Measurement, Max 50 °C
  • Temperature Measurement, Min -2 °C
  • Temperature Resolution 0.1 °C
  • Time Accuracy ± 1 minute/month 0° to 50°C
  • Transmission Range 30.5 m
  • Voltage Resolution Temperature: 0.1°C, 14 bit, Relative Humidity: 0.1%, 12 bit
  • Water Detection 100 µS/cm
  • Water Detection Note Water conductivity level of 100 µS/cm or greater necessary for reliable detection of water. Deionized water or water below 100 µS/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
  • Water Level Resolution Temperature: 0.1 °C, 14 bit, Relative Humidity: 0.1%, 12 bit
  • Weight 9.46 oz
The HOBO MX2501 pH and Temperature data logger is designed for long-term monitoring of pH in estuaries, lakes, streams, rivers, and oceans. Leveraging Bluetooth Low Energy (BLE) technology, the MX2501 pH logger communicates wirelessly with the free HOBOmobile app on iOS and Android devices, making logger setup, calibration, and data offload quick and easy. A guided pH calibration process on the HOBOmobile app makes an otherwise complicated process easier to follow. This affordable and compact logger dramatically cuts the time and effort needed to collect field data, while also offering higher-resolution data.

You can download the HOBOmobile app for free for Android devices here and for iOS devices here.

The Hobo MX Gateway (purchased separately) can be used to aggregate the data from up to 100 Hobo MX data loggers directly to a PC via Ethernet or WiFi communications.
  • bvseo_sdk, java_sdk, bvseo-4.0.0
  • CLOUD, getReviews, 4ms
  • REVIEWS, PRODUCT
  • bvseo-msg: The resource to the URL or file is currently unavailable.;

Is it possible to read the logger in real time instead of reading out the data? I would like to be able to cross-calibrate it to a CRM across multiple temperatures. And does it read in mV in addition to pH units? Thanks!

Asked by: MattB
Thank you for your question. The only way to read near real-time is using MX Gateway to Onset's cloud storage. https://www.omega.com/en-us/iiot-wireless-systems/wireless-receivers/p/HOBO-MX-Gateway?searchterm=bluetooth
Answered by: Raptor
Date published: 2021-03-03

Can this be used for industrial purposes, especially with chemical exposure in medical device industry?

Asked by: Sonny
Thank you for your question. We will require more information to help on this question, please email the DAS team at DAS@OMEGA.COM
Answered by: Application Engineer PV
Date published: 2022-03-18
  • y_2025, m_2, d_21, h_8CST
  • bvseo_bulk, prod_bvqa, vn_bulk_3.0.42
  • cp_1, bvpage1
  • co_hasquestionsanswers, tq_2
  • loc_en_CA, sid_MX2501, prod, sort_[SortEntry(order=NUM_ANSWERS, direction=DESCENDING)]
  • clientName_omega
  • bvseo_sdk, java_sdk, bvseo-4.0.0
  • CLOUD, getContent, 44ms
  • QUESTIONS, PRODUCT
en-CA
en_CA
Save Configuration