Elevate Your Water Monitoring with the HOBO MX800 Series CTD Sensor

Experience advanced monitoring capabilities with the Conductivity/Temperature/Depth sensor tailored for HOBO MX800 Series Water Loggers. Choose from sensor options ranging from 13 to 250 feet, suitable for diverse underwater environments in both freshwater and saltwater settings.

This interchangeable CTD sensor enables precise measurements of conductivity, temperature, and water level, empowering MX800 loggers to calculate specific conductance, salinity, and total dissolved solids (TDS) effortlessly. Seamlessly attach the CTD sensor to the MX801 model or connect via cable to the MX802 model for hassle-free data retrieval without disrupting sensor placement. Elevate your water monitoring efficiency with this versatile sensor solution.

Explore the Power of Precision Measurement in Freshwater and Saltwater Environments

Features

• Benefit from a 4-electrode conductivity sensor offering a broad measurement range, ideal for freshwater and saltwater monitoring.
• Experience minimised interference with the centrally located conductivity sensor, reducing impacts from stilling wells or protective guards.
• Utilise a robust ceramic water level sensor at the sensor tip for precise measurement of shallow water levels.
• Obtain water level data directly with the MX802, eliminating the need for post-processing.
• The slim 1” diameter design suitable for narrow wells when connected via cable to the MX802 above the well.
• Enjoy fast response times with the temperature sensor strategically positioned near the sensor tip.
• Rely on specially treated stainless steel construction that withstands harsh saltwater conditions for long-lasting durability.

Important Information

Requires a HOBO MX801 or MX802 Data Logger, the HOBOconnect app, and a compatible mobile device or Windows computer. System requirements for the app can be found at the bottom of our HOBOconnect software page.

Improve your monitoring precision with our HOBO MX800 Series Multiparameter Loggers.

This sensor requires an MX800 Series Data Logger for use. Customise your configuration to elevate your environmental data collection capabilities. Seamlessly integrate interchangeable sensors for conductivity, temperature, depth, and soon-to-be-added dissolved oxygen measurements.

Visit our MX800 Logger page to get started on optimising your monitoring setup today!

 

Conductivity Measurements
Measurement Range	Electrical conductivity and specific conductance: 0 to 100,000 µS/cm Salinity using PSS-78: 2 to 42 PSU Total Dissolved Solids (TDS): 0 to 100,000 mg/L
Calibrated Range	Electrical conductivity: 50 to 80,000 µS/cm | 5° to 35°C (41° to 95°F)
Accuracy	Conductivity: +/-2% or 15 µS/cm whichever is greater Salinity: +/-2% of reading or 0.1 PSU, whichever is greater
Resolution	Conductivity: 0.1 µS/cm from 0 to 1,000 µS/cm 1 µS/cm from 1,000 to 10,000 µS/cm 10 µS/cm from 10,000 to 100,000 µS/cm TDS: 0.1 mg/L Salinity: 0.01 PSU
Response Time	1 second to 90% at a stable temperature
Absolute Pressure and Water Level Measurements W-CTD-01
Range	0 to 207 kPa (0 to 30 psia); approximately 0 to 9 m (0 to 30 ft) of water depth at sea level, or 0 to 12 m (0 to 40 ft) of water at 3,000 m (10,000 ft) of altitude
Factory Calibrated Range	69 to 207 kPa (10 to 30 psia), 0° to 40°C (32° to 104°F)
Burst Pressure	310 kPa (45 psia) or 18 m (60 ft) depth
Water Level Accuracy*	Typical error: ±0.05% FS, 0.5 cm (0.015 ft) water Maximum error: ±0.1% FS, 1.0 cm (0.03 ft) water
Raw Pressure Accuracy**	±0.3% FS, 0.62 kPa (0.09 psi) maximum error
Resolution	<0.02 kpa=”” 0=”” 003=”” psi=”” 21=”” cm=”” 007=”” ft=”” water=”” td=””>
Pressure Response Time***	<1 second=”” to=”” 90=”” at=”” a=”” stable=”” temperature=”” td=””>
Absolute Pressure and Water Level Measurements W-CTD-02
Range	0 to 400 kPa (0 to 58 psia); approximately 0 to 30.6 m (0 to 100 ft) of water depth at sea level, or 0 to 33.6 m (0 to 111 ft) of water at 3,000 m (10,000 ft) of altitude
Factory Calibrated Range	69 to 400 kPa (10 to 58 psia), 0° to 40°C (32° to 104°F)
Burst Pressure	500 kPa (72.5 psia) or 40.8 m (134 ft) depth
Water Level Accuracy*	Typical error: ±0.05% FS, 1.5 cm (0.05 ft) water Maximum error: ±0.1% FS, 3.0 cm (0.1 ft) water
Raw Pressure Accuracy**	±0.3% FS, 1.20 kPa (0.17 psi) maximum error
Resolution	<0.04 kpa=”” 0=”” 006=”” psi=”” 41=”” cm=”” 013=”” ft=”” water=”” td=””>
Pressure Response Time***	<1 second=”” to=”” 90=”” at=”” a=”” stable=”” temperature=”” td=””>
Absolute Pressure and Water Level Measurements W-CTD-03
Range	0 to 850 kPa (0 to 123.3 psia); approximately 0 to 76.5 m (0 to 251 ft) of water depth at sea level, or 0 to 79.5 m (0 to 262 ft) of water at 3,000 m (10,000 ft) of altitude
Factory Calibrated Range	69 to 850 kPa (10 to 123.3 psia), 0° to 40°C (32° to 104°F)
Burst Pressure	1,200 kPa (174 psia) or 112 m (368 ft) depth
Water Level Accuracy*	Typical error: ±0.05% FS, 3.8 cm (0.125 ft) water Maximum error: ±0.1% FS, 7.6 cm (0.25 ft) water
Raw Pressure Accuracy**	±0.3% FS, 2.55 kPa (0.37 psi) maximum error
Resolution	<0.085 kpa=”” 0=”” 012=”” psi=”” 87=”” cm=”” 028=”” ft=”” water=”” td=””>
Pressure Response Time***	<1 second=”” to=”” 90=”” at=”” a=”” stable=”” temperature=”” td=””>
Absolute Pressure and Water Level Measurements W-CTD-04
Range	0 to 145 kPa (0 to 21 psia); approximately 0 to 4 m (0 to 13 ft) of water depth at sea level, or 0 to 7 m (0 to 23 ft) of water at 3,000 m (10,000 ft) of altitude
Factory Calibrated Range	69 to 145 kPa (10 to 21 psia), 0° to 40°C (32° to 104°F)
Burst Pressure	310 kPa (45 psia) or 18 m (60 ft) depth
Water Level Accuracy*	Typical error: ±0.075% FS, 0.3 cm (0.01 ft) water Maximum error: : ±0.15% FS, 0.6 cm (0.02 ft) water
Raw Pressure Accuracy**	±0.3% FS, 0.43 kPa (0.063 psi) maximum error
Resolution	<0.014 kpa=”” 0=”” 002=”” psi=”” 14=”” cm=”” 005=”” ft=”” water=”” td=””>
Pressure Response Time***	<1 second=”” to=”” 90=”” at=”” a=”” stable=”” temperature=”” td=””>
Temperature Measurements (All Models)
Range	-20° to 50°C (-40° to 122°F), non-freezing water
Accuracy	±0.15°C (±0.27°F) from 0° to 50°C (32° to 122°F)
Resolution	0.01°C at 25°C (0.018°F at 77°F)
Response TIme	3 minutes to 90% in water (typical)
Drift	<0.1°C (0.18°F) per year
Sensor
Dimensions	2.5 cm (1 inch) diameter, 15 cm (6 inches) length
Weight	Approximately xx g (xx oz) in air; approximately xx g (xx oz) in saltwater
Wetted Materials	Passivated 316 Stainless steel housing rated for use in saltwater, Viton and Buna-N O-rings, PET sensor connector Depth sensor: ceramic Conductivity sensor: PET, platinum plating on electrodes Note: Sensor should be mounted so that it is not in contact with other metals
Environmental Rating	IP68; Waterproof to pressure sensor burst pressure rating

* Water Level Accuracy: With accurate reference water level measurement, known water density, and a stable temperature environment. System Water Level Accuracy equals the sum of the Barometric Water Level Accuracy plus the selected CTD sensor Water Level Accuracy.

** Raw Pressure Accuracy: Absolute pressure sensor accuracy includes all sensor drift, temperature, and hysteresis-induced errors.

*** Changes in Temperature: Allow 20 minutes in water to achieve full temperature compensation of the pressure sensor. There can be up to 0.5% of additional error due to rapid temperature changes.

 

Download the free HOBOconnect app for your iOS or Android mobile device or Windows computer today.

Onset’s HOBOconnect app, accessed from a free download from the iTunes or Google Play app store, or your pc, makes it quick and easy to configure compatible MX Series data loggers (chart below) and manage the collected data. From your mobile device, tablet, or Windows computer, users 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, and store data in the cloud. HOBOconnect also makes it fast and easy to set up audible alarm notifications so users are immediately notified of problems.

Learn more about HOBOconnect >>