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MIDAS CTD+

Perfect for both profiling or fixed mooring applications, the MIDAS CTD+ is a revolutionary Multiparameter CTD with a wide choice of standard sensors.

Featuring Valeport’s latest 400 Series electronics, the CTD+ will sample all fitted sensors at exactly the same instant, at up to 8Hz. Advanced setup software allows a variety of sampling regimes including burst modes, delay starts and conditional sampling. Available with up to 64Mbyte memory and internal battery pack, as well as a selection of real-time output formats, the CTD+ may be used with Valeport’s own water bottle carousel.

Support

MIDAS CTD+ Datasheet
MIDAS CTD+ Operating Manual

Software

DataLog Pro
F3

Technical Specifications

Sensors

Fitted with CTD sensors as standard, plus your choice of optional additional sensors, either remote or bulkhead mounted. The CTD+ can also operate with Valeport’s water sampler system.

Conductivity

Type
Inductive Cell
Range
0 – 80mS/cm
Accuracy
+/-0.01mS/cm
Resolution
0.002mS/cm

Temperature

Type
PRT
Range
-5 - +35°C
Accuracy
+/-0.005°C
Resolution
0.002°C

Pressure

Type
Piezo-Resistive
Range
Up to 600Bar
Accuracy
+/-0.01%
Resolution
0.001%

Turbidity

Type
Seapoint STM
Range
0 – 2000FTU
Accuracy
+/-2%
Resolution
0.002%

DO

Type
Clark Cell
Range
0 – 16ml/l
Accuracy
+/-0.07ml/l
Resolution
0.017ml/l

pH

Type
Electrode
Range
1 - 13
Accuracy
+/-0.05
Resolution
0.01

Redox

Type
Electrode
Range
+/-1500mV
Accuracy
+/-1mV
Resolution
0.1mV

Chlorophyll

Type
Fluorometer
Range
0 - 800μg/l
Accuracy
see Hyperion datasheet
Resolution
see Hyperion datasheet

PAR

Type
Biospherical
Range
see manufacturer's datasheet
Accuracy
see manufacturer's datasheet
Resolution
see manufacturer's datasheet

Data Acquisition

Using the concept of distributed processing; each sensor has its own microprocessor to control sampling and calibration of readings. Each is then controlled by a central processor, which issues global commands and handles all data. This means that all data is sampled at precisely the same instant, giving superior quality profile data. It also allows additional sensor to be added or replaced in the field, without the need for factory recalibration.

Continuous:
Regular output from all sensors at 1, 2, 4 or 8Hz (the number of sensors may restrict the update rate)
Burst:
Regular sampling pattern, instrument takes a number of
readings, then sleeps for a defined time
Trip/Profile:
Data is output as a chosen parameter changes by a set
value, usually Pressure for profiling
Conditional:
Instrument sleeps until a selected parameter reaches a set value
Delay:
Instrument sleeps until predefined start time

Memory

Fitted with 16Mb solid state non-volatile FLASH memory. Capacity depends on sampling mode; continuous & burst modes have a single time stamp at the start of the file, trip mode (profiling) stores a time stamp with each reading. The examples are for CTD and 3 other parameters.

Continuous:
~1,400,000 data points
Profile:
>850,000 data points (60 profiles to 6000m)

Electrical

Internal:
8x D cells, 1.5V alkaline or 3.6V lithium
External:
9 – 30V DC
Power:
1.7W (sampling), <1mW (sleeping)
Battery Life:
>100 hrs (alkaline) | >250 hrs (lithium)
Connector:
SubConn MCBH10F

Communications

The instrument will operate autonomously, with setup and data download using a PC. It can operates in real time, with a choice of comms protocols for a variety of cable lengths, all fitted as standard and selected by pin choice on the output connector:

Standard
RS232 Up to 200m, direct to serial port via USB adapter
RS485 Up to 1000m, addressable half duplex comms
Baud Rate: 2400 - 115200
Optional FSK
2 wire power & comms up to 6000m cable (cable dependent)
Protocol: 8 data bits, 1 stop bit, No parity, No Flow
Baud Rate fixed at 38400

Physical

Materials:
Titanium\ Acetal housing
Polyurethane & acetal sensor components, Stainless steel (316) cage
Depth Rating:
6000m (Titanium), 500m (Acetal)
Instrument Size:
150mmØ x 590mm long
Cage Size:
210mmØ x 660mm long
Weight (in cage):
20kg (titanium), 12kg (acetal)
Shipping guide:
82 x 62 x 36cm | 38kg (titanium) | 30kg (acetal)

Software

System is supplied with DataLog Pro PC software, for instrument setup, control, data download and display. DataLog Pro software is licence free

Sensors Options

In addition to the standard Conductivity, Temperature and Pressure sensors, additional sensors available are, but not limited to, the following: · Turbidity · pH Sensor · PAR · Redox (ORP) · Transmissometer · Chlorophyll Fluorometer · DO Sensor (Clark Cell \ Optical) · Water Sampler interface Contact Valeport for specific information on optional sensors and configurations

Ordering

0606002-XX
MIDAS CTD+ (titanium or acetal), supplied with:
· Deployment cage and SubConn switch plug
· 3m communications lead and USB adapter
· DataLog Pro software
· Manual, tool kit and transit case.
Note:
XX denotes pressure sensor options.
Select from 10, 20, 30, 50, 100, 200, 300, 400 & 600 bar

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