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. It communicates wirelessly via Bluetooth Low Energy (BLE) to the HOBOmobile app on your phone or tablet, making logger setup, calibration, and data offload quick and easy, with no need for extra equipment or complicated calibration procedures.
This affordable and compact logger dramatically cuts the time and effort needed to collect field data, while also offering higher resolution in data.
Features:
- Supports pH and temperature
- Built for underwater environments
- Guided pH calibration following on-screen prompts in HOBOmobile 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 +-10C of temperature at calibration
Specifications
pH:
- Range: 2.00 to 12.00 pH
- Accuracy: +/- 0.10 pH units within +/- 10 C of temperature at calibration
- Resolution: 0.01 pH
- Response Time: 1 minute typical to 90% at constant temperature in stirred water
ORP:
- Range: -512 to 512 mV
- Accuracy: +/- 0.20 mV
- Resolution: 0.02 mV
Temperature:
- Range: -2 to 50 C (28.4 to 122 F)
- Accuracy: +/- 0.2 C (+/- 0.36 F)
- Resolution: 0.04 C (0.072 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 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, i.e. below 0C (32F).
- 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 50C (32 to 122F)
- Battery Type: One AA 1.5 Volt, user-replaceable
- 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
- Battery life: 1 year typical at 25C (77F) with logging interval of 1 minute and Bluetooth Always On selected in software./2 years typical at 25C (77F)
with logging interval of 1 minute and Bluetooth Off Water Detect enabled in software./3 years typical at 25C (77F) 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)
- 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)
- Weight: 268.2 g (9.46 oz)
