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 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 in 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 and Android 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
Key Specifications:
pH Range
2.00 to 12.00 pH; -512 to 512 mV
pH Accuracy
±0.10 pH units within ±10°C of temperature at calibration; ±0.20 mV
pH Resolution
0.01 pH; 0.02 mV
pH Response Time
1 minute typical to 90% at constant temperature in stirred water
Temperature Range
-2° to 50°C
Temperature Accuracy
±0.2°C
Temperature Resolution
0.04°C
Operating Range
-2° to 50°C - non-freezing
Waterproof
To 40 m
Wireless Data Standard
Bluetooth Low Energy (Bluetooth Smart)
Transmission Range
Approximately 30.5 m line-of-sight in air
Logging Rate
1 second to 18 hours
Battery Type
One AA 1.5 Volt, user-replaceable
Battery Life
1 year typical at 25°C with logging interval of 1 minute and Bluetooth Always On selected in software. 2 years typical at 25°C with logging interval of 1 minute and Bluetooth Off Water Detect enabled in software. 3 years typical at 25°C with logging interval of 1 minute and Bluetooth Always Off selected in software.
pH Electrode Life
6 months
Memory
152 KB (43,300 measurements, maximum)
Dimensions
22.86 x 4.27 cm
Weight
268.2 g
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 bulb
HOBOConnect App
Onset's free HOBOconnect app makes it fast and easy to configure compatible HOBO MX Series data loggers and manage the collected data. Just download the app from the Apple App Store or Google Play to your mobile device, or download from the Onset website to your Windows computer. With HOBOconnect, you 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, plus store data in the cloud. HOBOconnect also lets you quickly set up audible alarm notifications, so you're immediately alerted to any problems.
Communicates to HOBO MX data loggers using Bluetooth (LE) technology
No internet connection required
Set data logger's name, password, logging rate, alarm threshold, start and stop time
Automatically upload data to Onset's cloud-based HOBOlink software to store and merge data files
