Precision Pressure Monitoring Equipment APKD-1

Purpose

high precision measurement and proportional conversion of the measured absolute pressure of liquid gaseous media into a digital binary serial code and transmitting it to the upper level system
measurement of outboard pressure at the diving depth of uninhabited underwater vehicles
measuring the distribution of pressure fields under the cavity on air-cavity vessels or under the wing of an ekranoplan (WIG)
measurement of water level in wells (when connected to the control unit of the atmospheric pressure sensor DADS-1 to compensate for the effect of atmospheric pressure)
as piezometers for monitoring the pore pressure of water in the ground

Benefits

high accuracy characteristics over the entire operating temperature range up to 0.08% over the entire pressure measurement range, including the initial section
high resolution
sealed converter connector

Scope

autonomous uninhabited underwater vehicles, including gliders
air-cavity vessels, ekranoplans (WIGs)
water level measurements in wells, tanks, etc.

Principle of Operation

Precision pressure transducers operates based on changing the resonant frequency of vibrations of high-quality quartz resonators with long-term stability of calibration characteristics, under the impact of the measured medium pressure. One control unit allows connecting up to 20 converters with a single cable with information output to the display.

The display shows simultaneously the pressure information from 4 transducers with a sequential survey of all transducers. With external power supply for pressure transmitters, up to 31 transmitters can be connected to the control unit.

Specifications

	PDS-1	PDS-2
Upper limit of measured pressure, MPa	0,25; 0,6; 1,0; 2,5
Lower limit of measured pressure, MPa	0,06
Maximum allowable pressure, % of full scale	125
Allowable reduced measurement error limits in the operating temperature range, %	ф± 0,08
Controlled environment	sea water, air
Operating temperature range, °C: sea water/fresh water	5 to +40 / 0 to +40
Power supply voltage, V	5,0+0,5	6,5+0,5
Current consumption, mA, not more than	145	50
Output signal interface	RS-485
Sampling period, not less than	200	600
Overall dimensions	Ø 48х148
Weight, kg, not more than	0,6

Control unit specifications

Operating temperature range, °C	from -5 up to +40
Power supply voltage, V (BK-1 provides power to up to 20 connected PDS)	27±5
Current consumption (without PDS), not more than, A	0,2
Overall dimensions, mm	130х119,3х46,4
Weight, kg, not more than	0,35

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