Onset HOBO pH Logger
Features
- 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
- Guided pH calibration following on-screen prompts in HOBOmobile app
- Free ground shipping
- Expedited repair and warranty service
- Lifetime technical support
- More
Overview
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.
Mechanics
The guided pH calibration process on the HOBOmobile app makes an otherwise complicated process easier to follow. Dramatically cuts the time and effort needed to collect field data, while also offering higher resolution data.
Benefits
- 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
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) negative |
|
Waterproof | 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 bulb |
|
Environmental Rating | IP68 |
- MX2501 pH and Temperature Data Logger
- pH electrode
- Bottle of storage solution that can also be used as a storage container for the electrode
- Anti-biofouling copper guard
- Tube of silicone grease
- AA battery
In The News
Lake Malawi: A Treasure to Protect
Lake Malawi (also known as Lake Nyasa and Lake Niassa) doubles as a Rift Valley Lake and one of the seven African Great Lakes. Due to its unique biodiversity, it’s a great place to conduct limnological studies. Harvey Bootsma is a professor for the School of Freshwater Sciences at the University of Wisconsin-Milwaukee and has had an interest in limnology ever since he was a kid. Bootsma fondly recalls summer vacations to Georgian Bay, Ontario, “I probably spent as much time in the water as I did out of it.” He continues, "I remember telling myself, ‘I’m going to get a job where I can stay here all the time.’” While Harvey didn’t end up working on Georgian Bay, he was offered a job working on Lake Malawi. He continued working there while completing his Ph.D.
Read MoreMicrobes and Human Health: Aquatic Microbial Communities May Hold Clues about How Deadly Pathogens Spread
Aquatic ecosystems are incredibly complex, with many different biotic and abiotic factors constantly interacting. Microbial communities are a key part of aquatic ecosystems, involved in the constant flow of energy and recycling of organic matter, according to Science Direct . The true scope of microbial community impacts on aquatic ecosystems is still not entirely understood. Eric Benbow, a professor of community ecology at Michigan State University, is exploring how microbial communities and pathogens may be negatively impacting human health, and how a changing climate could worsen this problem. 
 How Do Pathogens Arise? 
 Benbow, along with his students and colleagues, are studying a realm of community ecology that is still relatively unknown.
Read MoreWinter 2023 Environmental Monitor Available Now
In this issue, we showcase researchers from across the globe and the importance of monitoring and protecting biodiversity in a variety of ecosystems. From endangered freshwater mussels across the U.S. to vegetation in the Amazon Rainforest , this latest edition highlights the importance of species of all sizes. Through monitoring various parameters, researchers spent the year gathering data and constructing management plans to protect these valuable species. 
 
Our writers also sought out science professionals that are dedicated to protecting nature’s most vulnerable through traditional and more contemporary methods.
Read More