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OVERVIEW
Easy data offload to mobile devices via Bluetooth!
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 HOBOconnect app and your mobile device or Windows computer, making logger setup, calibration, and data offload quick and easy. A guided pH calibration process on the HOBOconnect 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. (NOTE: pH electrodes should always be stored in storage solution when not deployed.)
Highlighted Features
- Guided pH calibration following on-screen prompts in HOBOconnect app
- Rugged PVC housing for deployment in both freshwater and saltwater environments
- Quick and easy data offload via Bluetooth Low Energy (BLE) to iOS devices
- Water detection system for longer battery life and less maintenance
- Potentiometric pH electrode with plastic body, gel electrolyte, and double cloth junction
- User-replaceable battery, pH electrode, and anti-biofouling copper guard
- Accuracy of ±0.10 pH units within ±10°C of temperature at calibration
Guided calibration on your mobile device
The HOBOconnect app’s built-in guided calibration feature makes an otherwise difficult task a breeze, seamlessly walking you through the pH calibration process.
In what environment does this data logger operate?
This data logger operates in an underwater environment.
What measurements does this data logger support?
The MX2501 data logger supports the following measurements: pH and Water Temperature
Important:
If you are purchasing the MX2501 for the first time you will also require the Calibration Kit.
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FAQ'S
Can I download data from an MX2501 pH logger deployed in water?
No, the logger needs to be removed from the water to download the data
Does the logger feature a user-replaceable electrode?
Yes
What type of pH electrode is used?
Plastic-bodied, double junction electrode with a Pellon junction and gel reference electrolyte
Can I calibrate with custom pH buffers?
No. The electrode is calibrated to 2 or 3 points using standard pH buffers (4, 7 and 10)
Is the calibration procedure the same for freshwater and saltwater applications?
The procedure itself is the same; however, some users deploying the loggers in saltwater may want to use a modified version of the pH buffers that includes chemicals (like Tris buffer) to make the hydrogen ion activity in the buffer more similar to its activity in saltwater.
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SPECIFICATIONS
pH Sensor
pH mV Range 2.00 to 12.00 pH -512 to 512 mV Accuracy ±0.10 pH units within ±10°C of temperature at calibration ±0.20 mV Resolution 0.01 pH 0.02 mV Response Time 1 minute typical to 90% at constant temperature in stirred water Sample Ionic Strength ≥ 100 µS/cm Temperature Sensor
Range -2° to 50°C (28.4° to 122°F) Accuracy ±0.2°C (±0.36°F) Resolution 0.024°C at 25°C (0.04°F at 77°F) Response Time 7 minutes typical to 90% in stirred water Logger
Operating Range -2° to 50°C (28.4° to 122°F) — non-freezing Buoyancy Fresh water: 13.6 g (0.48 oz) negative
Salt water: 19.6 g (0.69 oz) negativeWaterproof To 40 m (131.2 ft) Water Detection Water conductivity level of 100 µS/cm or greater is 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 (32°F).Radio Power 1 mW (0 dBm) Transmission Range Approximately 30.5 m (100 ft) line-of-sight in air Wireless Data Standard Bluetooth Low Energy (Bluetooth Smart) Logging Rate 1 second to 18 hours Logging Modes Fixed interval (normal, statistics) or burst Memory Modes Wrap when full or stop when full Start Modes Immediate, push button, date & time, or next interval Stop Modes When memory is full, push button, date & time, or after a set logging period Time Accuracy ±1 minute per month 0° to 50°C (32° to 122°F) Battery Type One AA 1.5 Volt, user-replaceable Battery Life 1 year typical at 25°C (77°F) with logging interval of 1 minute and Bluetooth Always On selected in software.
2 years typical at 25°C (77°F) with logging interval of 1 minute and Bluetooth Off Water Detect enabled in software.
3 years typical at 25°C (77°F) with logging interval of 1 minute and Bluetooth Always Off selected in software.
Faster logging intervals and statistics sampling intervals, burst logging, remaining connected with the app, excessive downloads, and paging may impact battery life.pH Electrode Typical Minimum Life 6 months in sample with ionic strength ≥ 100 µS/cm Memory 152 KB (43,300 measurements, maximum) Full Memory Download Time Approximately 60 seconds; may take longer the farther the mobile device is from the logger Dimensions 22.86 x 4.27 cm (9.0 x 1.68 inches); mounting hole 0.64 cm (0.25 inches) Weight 268.2 g (9.46 oz) Wetted Materials Logger: PVC housing and sensor end cap, polycarbonate closure caps and mounting end cap with a TPE switch
pH electrode: plastic-bodied with Pellon® junctions and gel electrolyte, glass pH sensor bulbEnvironmental Rating IP68 CE The CE Marking identifies this product as complying with all relevant directives in the European Union (EU). -
HOBOCONNECT
Download the free HOBOconnect app for your iOS or Android mobile device or Windows computer today.
Onset’s HOBOconnect app, accessed from a free download from the iTunes or Google Play app store, or your pc, makes it quick and easy to configure compatible MX Series data loggers (chart below) and manage the collected data. From your mobile device, tablet, or Windows computer, users can view data in graphs, check the operational status of loggers, share data files and graph images for analysis in Excel, Numbers, and other applications, and store data in the cloud. HOBOconnect also makes it fast and easy to set up audible alarm notifications so users are immediately notified of problems.
Learn more about HOBOconnect >>
HOBO MX2501 – pH and Temperature Bluetooth Data Logger
$1,915.00 ex GST
The new low-cost HOBO® MX2501 pH and Temperature logger is designed for long-term monitoring of pH in estuaries, lakes, streams, rivers, and oceans.
