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Onset HOBO® MX2501 Outdoor Bluetooth pH and Temperature Data Logger Specifications
| Data Channels | 1 Humdity Channel 1 Temperature Channel |
| pH | Measurement Range: 2.0 to 12.0 pH (-512 to 512mV) Accuracy: ±0.10 pH (±20 mV) units within ±10°C of Temperature at Calibration Response Time: 1 Minute Typical to 90% at Constant Temperature in Stirred Water Resolution: 0.01 pH (0.02 mV) |
| Temperature | Measurement Range: -2°C to 50°C (28.4°F to 122°F) Accuracy: ±0.2°C (±0.36°F) Response Time: 7 Minutes Typical to 90% in Stirred Water Resolution: 0.024°C at 25°C (0.04°F at 77°F) |
| pH Electorde Life | 6 Months |
| Bouyancy | Fresh Water:13.6g (0.48 oz) Negative Salt Water:19.6g (0.69 oz) Negative |
| Waterproof | Up to 40 Meters |
| Water Detection | Water Conductivity Level to 10 S/cm or Greater is Necessary for Reliable Detection of Water. 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. |
| Data Storage Capacity | 43,300 Readings (When Bluetooth Communications Not Available) |
| Logging Mode | Fixed Interval (Normal, Statistics) or Burst |
| Memory Mode | Wrap when Full or Stop When Full |
| Start Modes | Immediately, Push Button, Date & Time or Next Interval |
| Stop Modes | Wrap When Data Storage Full, Push Button, Date & Time or After Set Interval |
| Sampling Rate | 1 Second to 18 Hours (User-Specified) |
| Power Source | AA 1.5 Volt Lithium Battery (User-Replaceable) |
| Battery Life | Bluetooth Always On: 1 Year typical @ 1 Minute Sampling Rate Bluetooth Off, Water Detect Enabled: 2 Years typical @ 1 Minute Sampling Rate Bluetooth Always Off: 3 Years typical @ 1 Minute Sampling Rate Note: Dependant Upon Environment, Operating Range, Logging Interval, Remaining Connected with the App, Excessive Downloads and Paging May Impact Battery Life |
| Time Accuracy | ±1 Minute per Month 0°C to 50°C |
| Communications | Type: Bluetooth Wireless Wireless Data Standard: Bluetooth Smart (Bluetooth Low Energy, Bluetooth 4.0) Transmission Range: Up to 30.5 Meters (100 ft) Line of Sight Radio Power: 1 mW (0 dBm) |
| Software | HOBOmobile 1.7 Software App for iOS and Android Note: Bluetooth 4.0 is Required on your Mobile Device (Phone or Tablet) |
| OS Compatibility | Android Phones and Tablets iPhone, iPad, iPod Touch with iOS 7.1 or Later Bluetooth 4.0 or Later |
| Operating Range | Temperature: -2°C to 50°C (28.4°F to 122°F) - Non-Freezing |
| Standards Compliance | CE, IP68 |
| Environment | Designed for Outdoor and Underwater Usage |
| Materials | Data 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 Bulb |
| Weight | 286.2 grams (9.46 oz.) |
| Dimensions | 22.86 cm x 4.27 cm (9.0" x 1.68") |
Customer Reviews
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Question: The Description states that the pH Electrode has a 6 month life span! Is that Replaceable?
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Answer
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Answer:
Yes, this like most pH loggers and sensors typically need to have their pH electrode replaced somewhat regularly to ensure accurate readings. With normal use Onset recommends replacing it every six months. The electrode is available for purchase as a replacement item separately and shown on the right side of the webpage under "Related Products". The part number is MX2500-ELECTRODE and it costs $115. Here is a link to the page for it -
https://www.microdaq.com/onset-hobo-mx2500-replaceable-ph-electrode.php
It is also recommended that you calibrate the sensor before each use using a pH solution. These are also listed on the page as accessory items however you are free to use any other pH solution you might already have.
