Tianjin Hydro-Tech Marine Technology Co. Ltd., a subsidiary of Beijing Hydro-Tech, was founded in February 2024. It is dedicated to three parts of business including monitoring product development, transducer design and parameter probe manufacture. Relying on the advantages of coastline location, we provide integration test and services for various unmanned platforms and training for operation of the full Hydro-Tech product line.

 

At present, Tianjin Hydro- Tech focus on the parameter measurement of temperature, salinity, depth, sound velocity, underwater noise and other environmental parameters, forming a series of products such as disposable products, self-contained/direct-reading products, towed products and component products. At the same time, we can also provide tailor-made service to fulfil the request of different application fields.

 

XCTD/XBT/XTD/XSV can be dropped without stopping the survey vessel while sailing. Then it can real-time measure the temperature, salinity and sound velocity profiling data of the seawater. It has the features of real-time, fast, hidden and low cost, which is very suitable for large-scale measurement and sensitive sea areas.

 

Expendable parameter measurement probe is composed of sensor head, firing gun and deck unit. The head is launched into the water via the firing gun. The sensor head would continuously measure the temperature, salinity, sound velocity and depth of the sea water during the falling process. The measured data is transmitted to the deck unit through a thin copper wire. Then the seawater temperature, salinity or sound velocity profiling data is displayed real-time after processing by the data processing software.

 

These XBT, XTD, XCTD and XSV is a important way to monitor the dynamic ocean environmental and can be widely used in Marine investigation, scientific research and oceanology applications.

 

XBT is composed of waterproof thermistor, high-strength thin copper wire and streamlined shell.

 

XTD is composed of high precision rapid response temperature sensor, high precision pressure sensor, high-strength thin copper wire and streamlined shell.

 

XCTD is composed of high precision rapid response temperature sensor, high sensitivity induction conductivity sensor, high precision pressure sensor, high-strength thin copper wire and streamlined shell.

 

XSV is composed of high precision rapid response temperature sensor, "Time Leaping" sound velocity sensor, high precision pressure sensor, high-strength thin copper wire and streamlined shell.

 

Firing gun is used to launch sensor heads into water. It can be customized as automatic firing device.

 

Deck unit is used to receive data and process it. Then the whole system measures the corresponding temperature, salinity and sound velocity data.

 

Main Features:

 

• High Performance

With latest innovative sensors, including high precision rapid response temperature sensor, "Time Leap" sound velocity sensor and high precision pressure sensor, the performance has been greatly enhanced.

 

• High reliability With Real-time long-distance data transmission technology in seawater, combined with 0.01mm diameter high-strength thin copper wire, the probes can achieve stable data transmission at 12 knots of speed through up to 2000 meters depth and ensure the success rate of head launching delivery and data efficacy.

 

• High accuracyAdopting the international 5-point calibration method and combining the independent design and construction of automatic sensor head calibration assembling line, the probes have been eliminated the external interference in the calibration process improved the survey accuracy of the sensor head and efficiency of production.

 

• Long DurationAdvanced low power consumption design ensures that the sensor head storage time is more than 4 years.

 

• Easy OperationThe new design of the firing gun and deck unit is light and compact. One person can operate independently.

 

Specifications

XBT

Type	Temperature		Depth		Max velocity
	Range	Accuracy	Range	Accuracy
HT-XBT1	-2～35°C	±0.1°C	460m	±2%F.S. or 5m	16 Knots
HT-XBT2	-2～35°C	±0.1°C	760m	±2%F.S. or 5m	16 Knots

XTD

Type	Temperature		Depth		Max velocity
	Range	Accuracy	Range	Accuracy
HT-XTD1	-2～35°C	±0.1°C	1000m	±2%F.S. or 5m	16 Knots
HT-XTD2	-2～35°C	±0.1°C	2000m	±2%F.S. or 5m	16 Knots

XCTD

Type	Temperature		Conductivity		Depth		Max velocity
	Range	Accuracy	Range	Accuracy	Range	Accuracy
HT-XCTD1	-2～35°C	±0.1°C	0～65mS/cm	±0.03 mS/cm	1000m	±2%F.S.	16 Knots
HT-XCTD2	-2～35°C	±0.1°C	0～65mS/cm	±0.03 mS/cm	2000m	±2%F.S.	16 Knots

XSV

Type	Temperature		Sound velocity		Depth		Max velocity
	Range	Accuracy	Range	Accuracy	Range	Accuracy
HT-XSV1	-2～35°C	±0.1°C	1400～1600m/s	±0.1 m/s	1000m	±2%F.S.	12 Knots
HT-XSV2	-2～35°C	±0.1°C	1400～1600m/s	±0.1 m/s	2000m	±2%F.S.	12 Knots

 

Software

Specially designed data acquisition and processing software for XCTD/XBT/XTD/XSV is compatible with many brands of sensor heads. Its functions include sensor head type selection, latitude and longitude reading and writing, sensor head falling status display, data recording, data processing, data mapping and data comparison etc. It can calculate temperature, conductivity, salinity, sound velocity, density and other data according to authoritative formulas.

 

The EOS801983 formula recommended by UNESCO was adopted to calculate the depth value in unit of meter at of the measuring point by the measured pressure value (decibars) and latitude information.

 

The EOS80 1983 formula recommended by UNESCO was adopted to calculate the salinity (psu) in seawater at the measuring point by the measured conductivity (mS/cm), temperature (ITS-90 temperature scale) and pressure (decibars).

 

The EOS80 83 formula recommended by UNESCO was adopted to calculate the density (kg/m³) of seawater at the measuring point by using the measured pressure (decibars), temperature (ITS-90 temperature scale) and salinity value (psu).

 

Wilson formula, Del Grosso formula, Chen-Millero-L formula, Chen-Millero formula and other four commonly used sound velocity (m/s) calculation formulas are provided for users to measure sound velocity profile.