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CTD - Conductivity Temperature Depth : Micro CTD
CTD - Conductivity Temperature Depth : Micro CTD : Description
The Micro CTD is a small, high performance and flexible CTD. With rapid response times on conductivity (25 milliseconds at 1 m/s flow), temperature and pressure sensors, salinity spiking is minimized without relying on pumps or other moving parts.
In this configuration, the Micro CTD comes with two additional sensors: the Idronaut Dissolved Oxygen and the WetLabs WetStar fluorometer.
The CTD is self-powered and uses a separate battery pack. Similarly, the CTD can log data or communicate it in real-time to the surface via RS232. The additional sensors are remote and placed in external pressure housings. The unit comes with mounting brackets, a suspension bar, and interconnect cables between the additional sensors and the CTD. One single, consolidated data stream is provided.
CTD - Conductivity Temperature Depth : Micro CTD : Summary Information:
| Name: | Micro CTD | | Category: | CTD - Conductivity Temperature Depth | | Model: | Micro | Number: | n/a | | Description: | The Micro CTD is a small, high performance and flexible CTD. With rapid response times on conductivity (25 milliseconds at 1 m/s flow), temperature and pressure sensors, salinity spiking is minimized without relying on pumps or other moving parts.
In this configuration, the Micro CTD comes with two additional sensors: the Idronaut Dissolved Oxygen and the WetLabs WetStar fluorometer.
The CTD is self-powered and uses a separate battery pack. Similarly, the CTD can log data or communicate it in real-time to the surface via RS232. The additional sensors are remote and placed in external pressure housings. The unit comes with mounting brackets, a suspension bar, and interconnect cables between the additional sensors and the CTD. One single, consolidated data stream is provided. | | Configuration: | DO Chlorophyll | | Application: | For use in profiling the water column, particularly when high speed sampling is required. | | Credibility Note: | n/a | | Case Study Link : | n/a | | Price: | Consult factory |
CTD - Conductivity Temperature Depth : Micro CTD : Usage Information:
| Int Description: | MC3 w/battery | | Max Number Of Sensors: | 5 | | Depth Rating: | 500, 4500, 10000 | Housing Material: | Copolymer Acetal (Delrin), 316 Stainless Steel, Titanium | | Weight Air: | n/a | | Weight Water: | n/a | | Length: | 243 (instrument, not including sensors) plus 272 (battery pack); can be placed end-to-end or side-by-side | | Diameter: | 50 (instrument and battery pack) | | Power Source : | Battery | | Housing Notes: | Battery |
CTD - Conductivity Temperature Depth : Micro CTD : Sensor Information:
| Name: | Conductivity | | Manufacturer: | Applied Microsystems | | Type: | Conductive | Model: | n/a | | Accuracy: | 0.01 mS/cm; 0.005 mS/cm precision | | Range: | 0 - 7 S/m or 0 - 70 mS/cm | | Response Time: | 25ms @ 1m/s | | Max. Frequency: | 25Hz | | Maximum Depth(m): | 6000m | | Resolution: | 0.0015 mS/cm | | Stability | n/a | | Location: | n/a | | Notes: | The Applied Microsystems conductivity sensor is short, with a length of just under 3 cm. Sensor length plays a critical role in determining resistance to the introduction of new flows into the sensor cavity, and hence response times. The equation for response time is as follows:
Response Time = (0.85 * Length of Sensor ) / Flow Speed.
Using the above, our conductivity sensor has a response time of 25 milliseconds in a 1.0 m/second flow environment and 255 milliseconds in a 0.1 m/second flow environment. Given the above, no pumps or flow tubes are required. |
| Name: | Pressure | | Manufacturer: | Keller | | Type: | Semiconductor bridge strain gauge | Model: | PA-10 | | Accuracy: | 0.05%FS | | Range: | Various to 6000 dbar | | Response Time: | 10ms | | Max. Frequency: | 25Hz | | Maximum Depth(m): | 6000m | | Resolution: | 0.002%FS | | Stability | n/a | | Location: | n/a | | Notes: | n/a |
| Name: | Temperature | | Manufacturer: | Applied Microsystems | | Type: | Thermistor | Model: | n/a | | Accuracy: | 0.005C | | Range: | -2 to 32C | | Response Time: | 100ms | | Max. Frequency: | 25 Hz | | Maximum Depth(m): | n/a | | Resolution: | 0.001C | | Stability | n/a | | Location: | n/a | | Notes: | Made of stainless steel |
| Name: | Chlorophyll A | | Manufacturer: | WetLabs | | Type: | Fluorometric (LED) | Model: | WETStar | | Accuracy: | Dependent of reference material | | Range: | 0.03 to 75 micrograms | | Response Time: | 0.17 s | | Max. Frequency: | Varies by CTD model (25Hz Micro, 10Hz Smart, 8Hz Plus) | | Maximum Depth(m): | 500 | | Resolution: | 1 mV | | Stability | n/a | | Location: | n/a | | Notes: | n/a |
| Name: | Dissolved Oxygen | | Manufacturer: | Idronaut | | Type: | Polarographic | Model: | n/a | | Accuracy: | 0.2 mg/l | | Range: | 0 to 15 mg/l | | Response Time: | 3s | | Max. Frequency: | Varies by CTD model (25Hz Micro, 10Hz Smart, 8Hz Plus) | | Maximum Depth(m): | 1500 | | Resolution: | 0.01 mg/l | | Stability | n/a | | Location: | n/a | | Notes: | Idronaut states that maintenance (electrolyte and membrane replacement) should be carried out at least every three months. In-field calibration should be carried out after a long period of disuse, once a day during an extended field survey, or once a month if installed on a buoy profiler. |
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