Valeport BFM 803 Current Meter – Available for rental, hire and purchase from Ashtead Technology.
The MIDAS CTD (previously known as the Model 606) is Valeport's premier Conductivity, Depth and Temperature unit (CDT) Profiler. High accuracy sensors and robust titanium design allow reliable operation to 5000m depth, under the harshest conditions. It also features truly synchronised sampling to ensure that all sensors are sampled at exactly the same point during a profile.
The MIDAS CTD is fitted with Valeport s low external field conductivity sensor, a fast response PRT temperature sensor, and a high accuracy strain gauge pressure transducer.
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.
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.
The MIDAS CTD is fitted with 8Mb 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. A single line of CTD data uses 6bytes, and a time stamp uses 7 bytes. Continuous: >1,350,000 data points Profile: >600,000 data points (53 profiles to 6000m).
System supplied with DataLog 400 Windows based PC software, for instrument setup, data extraction and display. DataLog 400 is licence free.
Primarily for use as as lef recording profiler, the MIDAS CTD also has a range of communications options for real time use, and the low power consumption and large memory also make it suitable for longer term deployments.
|Conductivity Range||0 to 80 mS/cm|
|Temperature||Range: -5°C to +35°C Resolution: 0.005°C Accuracy: ±0.01°C|
|Pressure||Range: Choose from 5, 10, 50, 100 or 600 Bar Resolution: 0.005% range|
|Accuracy: ±0.04% range|
|Sampling Modes||Continuous: Regular output from all sensors at 1, 2, 4 or 8Hz. Burst: Regular sampling pattern, where instrument takes a number of readings,|
|Standard Communications||RS232: Up to 200m cable, direct to serial port. RS485: Up to 1000m cable, addressable half duplex comms RS422: Up to 1500m cable, addressabl|
|Communications Options||FSK: 2 wire power & comms up to 6000m cable USB: For rapid upload or laptops without serial port Baud Rate: 2400 - 115200 (FSK fixed at 1920|
|Electrical||Internal: 8 x C cells, 1.5v alkaline or 3.6v lithium External: 9 - 30vDC Power: 0.6W (sampling), <1mW (sleeping) Battery Life: <100 hours op|
|Materials||Titanium housing, acetal & polyurethane sensor components, stainless steel (316) cage|
|Depth Rating||6000 m|
|Instrument Dimensions||88mm x 665mm||3.5 x 26.2""|
|Cage Size||750 x 140 x 120mm||30 x 5.5" x 4.7""|
|Weight in air||11.5kg||25.3 lbs|
|Weight in water||8.5kg||18.7 lbs|
|Shipping||160 x 460 x 1020mm||6.3 x 18.1" x 40.2""||29kg||64 lbs|