Product Features	The GCD302 series input type temperature and pressure integrated liquid level gauge adopts imported high-quality silicon piezoresistive sensors and imported temperature sensors
	Sensors; High strength extended air conducting cable structure; High measurement accuracy (pressure accuracy 0.1%, 0.2%, 0.5%; temperature
	Accuracy ± 1 ℃); Reliable sealing technology process, superior stability, reliable modular design, strong applicability;
	Equipped with analog, intelligent (HART, RS485), and intrinsic safety types; Widely applicable to hot spring water and underground hot water, etc
	Liquid level measurement in various fields and industries.

Working principle	DB302 temperature and pressure integrated liquid level gauge, three wire current signal output (including pressure and temperature, shared power supply)
	Exactly). High performance high-temperature pressure sensors are used as measuring elements, and sensitive thermal sensing elements are selected for temperature measurement, which are resistant to high temperatures
	High temperature dedicated digital circuit processing, using temperature compensation technology and nonlinear correction technology to convert pressure and temperature signals into
	The standard signal establishes a linear relationship between the liquid level depth and temperature and the signal, making it a high-precision high-temperature resistant liquid
	The ground data processing unit of the positioning measurement product consists of a communication interface circuit, a display unit, a data storage unit, and related work
	Software composition. During the working process, the temperature and pressure integrated liquid level gauge is controlled by a ground control instrument through a high-strength extended air guide cable
	Provide power supply, temperature and pressure sensors to convert groundwater level height and temperature into electrical signals for output, and convert electrical signals
	After amplification and analog-to-digital conversion, the data is collected and processed in real-time by a microcontroller system, and then passed through digital communication at a certain cycle
	Message output. The liquid level gauge is connected to the ground data processing unit through a high-strength extension cable, and the ground data processing unit
	The communication port circuit of Yuanzhong receives and displays the pressure and temperature data output by the downhole electronic pressure gauge, which is decoded and input for calculation
	Real time analysis and processing are carried out in the machine, and the liquid level gauge adopts electronic components of military technology standards, which are suitable for harsh underground environments
	Work, high sensitivity and accuracy, reliable performance and temperature.

Technical Parameter	·Pressure measurement range	Minimum 0~1m, maximum 0~350m
	·Pressure measurement accuracy	0.1% FS, 0.2% FS, 0.5% FS (comprehensive error includes linearity, hysteresis, and repeatability)
	·Temperature measurement range	-20℃~150℃
	·Temperature measurement accuracy	± 1 ℃, ± 2 ℃
	·Allowable medium temperature	Standard type -20~+80 ℃; High temperature type -20~+150 ℃
	·Compensation temperature	Standard type -20~+85 ℃; High temperature type -20~+120 ℃
	·Allow storage temperature	Standard type -40~+80 ℃; High temperature type -40~+150 ℃
	·Pressure accuracy	0.2%, 0.1% accuracy level, full temperature range ± 0.5% (based on 20 ℃)
	Temperature influence	accurate 0.5% precision level full temperature range ± 1% (based on 20 ℃)
	·Pressure signal output	4-20mA two-wire analog signal; 4~20mA two-wire system simulation
		Signal with HART communication protocol function; MODBUS protocol RS485 output
		Type; Special requirements agreed upon
	·Power supply	Analog type (12.5-30) V DC; Intelligent (12~36) V DC
		Intrinsic safety type (8-24) V DC; RS485 output type (12~36) V DC
	·Long term stability	Better than 0.15% FS in two years
	·Allow environmental humidity	95%HR
	·Contact with medium	Sensor -316L or special requirements; Measuring Sensor Object -316L
	Partial materials	Or special requirements; Cable - PU (polyurethane rubber, up to 80 ℃)
		FEP (perfluoroethylene propylene, up to 150 ℃)
	Other electrical parameters
	·Preheating time	Simulated 200ms; Intelligent type: 2ms
	·Corresponding time	Simulation type: 60ms; Intelligent type: 230ms
	·Damping	Analog type: 2s; Intelligent type: 0-32s
	·Electromagnetic compatibility	The radiation immunity of radio frequency electromagnetic fields complies with GB/T17626.3-1998
		10V/m, compliant with Class A standards; The conduction impedance of RF field induction meets the requirements
		GB/T17626.6-1998 U=10V, compliant with Class A
	·Explosion proof mark	Exia II C T6 Ga； Explosion proof certificate number: CE14.2068
	·Parameters	Ui：30V DC、li：120mA、Pi：0.9W、Li：0mH、Ci：0.02μF
	·Allow overload pressure	150% F.S below 20MPa; 150% F.S at 20~30 MP
	·Protection level	IP68

Exterior structure

Standard cable

High temperature cable

Electrical connection

load characteristics

Communication protocol

Overlay a digital signal on the 4-20mA two-wire output signal of the level gauge transmitter to achieve the HART communication protocol standard

Several functions.The functional implementation includes the following: manual operation using the HART communication protocol or a microcomputer (requires configuration)

HART Communication Protocol Software InterfaceRemote calibration of the zero and full range values of the liquid level transmitter, display of medium temperature values, and display of past readings

Adjust the pressure and liquid level value, adjust the damping value, and achieve measurementThe self diagnostic function of the system displays various fault states represented by fault codes

Location and reason.

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