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
Stone Lab: Cyanobacteria Monitoring in Ohio Lakes
Microcystin, one of several toxins produced by the cyanobacteria that form harmful algal blooms (HABs), has become a popular topic of lake research as the human health impacts of HABs become better understood. Stone Lab is one of the leading groups in algal bloom research on Lake Erie and other lakes in Ohio. 
 
For more than 100 years, Stone Lab has conducted biology research and provided science education and outreach to the region. Over the years, thousands of individuals of varying ages have learned from the resources Stone Lab provides. 
 
Stone Lab’s Research Coordinator and Senior Researcher, Justin Chaffin, learned of Stone Lab while an undergraduate student at Bowling Green State University Fireland Campus.
Read MoreFrom Assessment to Angler: Continual Research Ensures Lake Erie Remains a Beacon of Freshwater Fishing
Lake Erie is well known for its abundant recreational fishing. Anglers come from across the country to try their luck at the “walleye capital of the world” and search for other freshwater species, such as bass, perch, and steelhead trout. 
 
 As one of the world’s largest freshwater fisheries, much effort is made behind the scenes to maintain fishing opportunities for visitors to enjoy year after year, efforts that often go unnoticed by the public. 
 
 One of the lake's most important economic and tourism centers is the city of Sandusky, home to the Sandusky Fisheries Research Station . As part of the Ohio Division of Wildlife, the unit serves as a base for assessing fish populations and managing harvest with partner agencies from around Lake Erie.
Read MoreHigh Definition Stream Surveys: Informed Management in Local Waterways
When it comes to environmental monitoring, new stream survey methodologies have revealed a great deal about water quality and streambed conditions over time. Such information can be particularly important in leading restoration initiatives and prioritizing management decisions. 
 
Historically, stream surveys have been conducted at a single point along the stream, with data then extrapolated for miles up and downstream. However, Brett Connell, Hydrologist and Director of Sales at Trutta Environmental Solutions, started developing a more intensive stream survey format in his master's program in 2010 at the University of Tennessee.
Read More