HOBO MX800 CTD Sensor
HOBO MX800 CTD Sensor
HOBO MX802 CTD Logger

Part Numbers

W-CTD-01W-CTD-02W-CTD-03W-CTD-04

CTD Sensor

$895.00 USD
A Conductivity/Temperature/Depth sensor for use with HOBO MX800 Series Water Loggers with sensor options available for 13, 30, 100 or 250 feet in a wide range of underwater environments; for use in freshwater or saltwater.

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.

Options for this product

Overview

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 wide measurement range for monitoring freshwater or saltwater
  • Conductivity sensor is centrally located to minimize 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

Specifications

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
Image
CE Compliance Mark
Image
UKCA (UK Conformity Assessed) Mark

* 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.

 

Compatible items

Data Logger(s)

Antifouling Protective Guard

W-GUARD-1
$95.00 USD

Communication Cables

CABLE-W-1.0
$106.00 USD
CABLE-W-2.0
$112.00 USD
CABLE-W-5.0
$130.00 USD
CABLE-W-010
$160.00 USD
CABLE-W-015
$190.00 USD
CABLE-W-030
$280.00 USD
CABLE-W-060
$460.00 USD

Calibration Solution

COND-CAL-1
$25.00 USD
COND-CAL-2
$25.00 USD
COND-CAL-3
$25.00 USD
COND-CAL-4
$25.00 USD

Accessories

MX2500-CAL-BKR
$6.00 USD

What's in the box

  • CTD Sensor

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