CTD Sensor (Conductivity/Temperature/Depth)

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Manufacturer: Onset

Condition: New

A Conductivity/Temperature/Depth sensor for use with HOBO MX800 Series Water Loggers, available for depths of 13, 30, 100, or 250 feet in a wide range of underwater environments; for use in freshwater or saltwater.

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OVERVIEW
SPECIFICATIONS
Download

MX800 Series User Guide Download (5.49M)

MX801 Quick Start Guide Download (453.65k)

MX802 Quick Start Guide Download (1.19M)

The CTD sensor is an interchangeable sensor that works with HOBO MX800 Series Water Loggers to measure conductivity, temperature, and water level. With this sensor attached to a HOBO MX800 Series Water Logger, the logger can also calculate specific conductance, salinity, and total dissolved solids (TDS).

The CTD sensor can be attached directly to the fully submersible MX801 model, or attached via cable to the direct read MX802 model, which doesn’t require having to pull the sensor out of the water to download data.

Features

4-electrode conductivity sensor: Provides a wide measurement range for monitoring freshwater or saltwater.
Centralized conductivity sensor: Minimizes effects from stilling wells or protective guards.
Durable ceramic water level sensor: Located in the sensor tip for accurate measurement of shallow water levels.
Get water level directly with the MX802: No need for post-processing.
1” diameter: For use in narrow wells (with cable to MX802 above the well).
Temperature sensor placement near the sensor tip: For fast response time.
Specially treated stainless steel: Holds up in saltwater.

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), 0.21 cm (0.007 ft) water
Pressure Response Time***	<1 second to 90% at a stable temperature

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), 0.41 cm (0.013 ft) water
Pressure Response Time***	<1 second to 90% at a stable temperature

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), 0.87 cm (0.028 ft) water
Pressure Response Time***	<1 second to 90% at a stable temperature

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), 0.14 cm (0.005 ft) water
Pressure Response Time***	<1 second to 90% at a stable temperature

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, 18.7 cm (7.37 inches) length
Weight	177g 6.24 oz
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.