上海精导科学仪器有限公司
上海精导科学仪器有限公司
上海精导科学仪器有限公司
Valeport公司MIDAS CTD+ 多参数温盐深仪
Valeport公司MIDAS CTD+ 多参数温盐深仪

Valeport applies its unique distributed processing technology to the MIDAS CTD+, resulting in a multiparameter CTD that is essentially tailor made to suit each customer’s requirements. The instrument is able to accept any combination of a range of industry standard sensors, giving calibrated data in both autonomous and real time operations. A choice of titanium or acetal construction makes it suitable for coastal or deep water operations, and the intuitive software allows a range of both simple and complex sampling regimes.


Sensors

The MIDAS CTD+ is 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, described on a separate brochure.


Conductivity

Type:            Inductive Cell

Range:         0-80mS/cm

Accuracy:     ±0.01mS/cm

Resolution:   0.002mS/cm


Pressure

Type:            Piezo-Resistive

Range:         Up to 600Bar

Accuracy:     ±0.01%

Resolution:   0.001%


Temperature

Type:            PRT

Range:         -5-35℃

Accuracy:     ±0.005℃

Resolution:   0.002℃


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:          0-150μg/l

Accuracy:     ±0.03μg/l

Resolution:   0.005%


PAR

Type:            LICOR

Range:         10,000μmol/s/m2

Accuracy:     ±1%

Resolution:   0.5μmol/s/m2

Other sensors are also available – please consult Valeport


Data Acquisition

The MIDAS CTD+ uses the concept of distributed processing, where each sensor has its own microprocessor controlling sampling and calibration of readings. Each of these is then controlled by a central processor, which issues global commands and handles all the 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

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


Communications

The instrument will operate autonomously, with setup and data extraction performed by direct communications with PC before and after deployment. It also operates in real time, with a choice of communication 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 cable, direct to serial port via USB adaptor

RS485             Up to 1000m cable, addressable half duplex comms

Optional FSK

2 wire power & comms up to 6000m cable (cable dependant)

Baud Rate:     2400 - 115200 (FSK fixed at 19200, USB 460800)

Protocol:        8 data bits, 1 stop bit, No parity, No flow control


Memory

The MIDAS CTD+ is fitted with 16Mb solid state non-volatile FLASH memory. Total 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. Each parameter uses 2 bytes per sample and a time stamp uses 7 bytes. The examples are for an instrument measuring 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 hours operation (alkaline)

                         >250 hours operation (lithium)

Connector:        SubConn MCBH10F


Physical

Materials:             Titanium 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 Windows based PC software, for instrument setup, control, data extraction and display. DataLog Pro is licence free.