KZY-3051 Digital Capacitive Differential Pressure Transmitter

Product Description

Primarily used for measuring the pressure, vacuum, and absolute pressure of gases, liquids, and steam, and then converting them into a 4-20mA DC signal output. Pressure transmitters include two types: GP (gauge pressure) and AP (absolute pressure). When combined with an intelligent amplification board, GP and AP types can form an intelligent pressure transmitter. It can communicate with each other through a HART protocol-compatible hand-held operator for configuration and monitoring. The δ chamber of the GP pressure transmitter receives the measured pressure signal on one side and is connected to atmospheric pressure on the other, thus suitable for measuring gauge pressure or vacuum.

Technical Specifications

Technical Specifications

The process pressure is transmitted to the middle measuring diaphragm in chamber 6 through isolation diaphragms on both or one side and the filling fluid. The middle diaphragm is a tensioned elastic element, which undergoes corresponding deformation displacement due to the pressure difference acting on both sides. This displacement is proportional to the differential pressure, approximately 0.1mm. This displacement change forms a differential capacitance on the capacitor plates, which is then converted into a 4-20mA DC signal in a two-wire system by electronic circuitry.

Supply Voltage: 12-36V DC, Standard 24VDC

Output Signal: 4-20mADC; (Special options available for 4-wire 220V AC power supply with 0-10mA DC output)

Ambient Temperature: -25～70℃ (standard transmitter), -15～70℃ (with field indicator)

Storage Temperature: -40 to 100℃

Protection Rating: IP65, EXdⅡCT6, EXiaⅡCT5

Flange Standard: T82.2-94 (Please specify other standards if applicable)

Power Influence: Less than ±0.005%/V of the output range.

Vibration Impact: Error of 0.05% / g (micropressure of 0.25% / g) at 200Hz vibration frequency in any direction.

Installation Position Impact: When the working diaphragm is not vertically installed, a zero error of no more than 0.24 Pa may occur, which can be corrected by adjusting the zero position without affecting the range.

Accuracy: ±0.25%, ±0.5% (Intelligent model: ±0.1%, ±0.075%)

Stability: No more than the transmitter's accuracy within six months.

Pressure Relief Fitting: The connection screw holes on the pressure vessel are 1/2-14 NPT, the same as standard 1151.

The cable connection hole has a screw thread of M20×1.5.

Indicator: Field output indicator with ammeter, linear indication 0～100%; 3-1/2-digit LCD display.

Span and Zero Point: externally continuously adjustable.

Positive and Negative Shifts: Differential Pressure Transmitter: The upper limit of positive shift is 500%, and the lower limit of negative shift is 600%.

Absolute Pressure: Positive migration rate of 500%, only positive migration allowed.

Overload Pressure: The transmitter will not be damaged if the pressure does not exceed 1.15 times the specified pressure.

Volume change: Less than 0.16 cm³

Damping Time: Continuously adjustable within 0.2 to 1.67 seconds during the filling of silicone oil.

(Without migration, under standard operating conditions, silicone oil-filled, 316 stainless steel diaphragm)

Accuracy: ±0.25%, ±0.5% (Intelligent Type: ±0.1%, ±0.075%)

Dead Zone: None (≤0.1%)

Stability: No more than the basic error value of full scale within six months.

Vibration Influence: At a vibration frequency of 200 Hz in any axis, the error is ±0.05% of the measurement range per g.

Power Influence: Less than 0.005% / V of the output range

Load Impact: No impact on load if power is stable.

Isolation Membrane Sheets: 316 Stainless Steel, Haste Alloy C-276, Monel Alloy, or Tantalum

Exhaust/Drain Valve: 316 Stainless Steel, Hastelloy C, Inconel Alloy

Flanges and Fittings: 3I 6 stainless steel, Hastelloy C or Monel alloy

O-Ring Contact Medium: Nitrile Rubber, Fluorinated Rubber

Filling fluid: Silicone oil or inert oil

Screw: 316L Stainless Steel

Electronic Shell Material: Low-Copper Aluminum Alloy

Signal Line Connector Hole: G 1/2

Weight: 2.4kg (Standard Model)

Pressure-Reducing Connectors: Flanges, NPT 1/4, center hole spacing 54mm; fittings with NPT 1/2 or M20x1.5 male threads, ball and cone face seal, with fitting, center hole to center hole spacing 50.8, 54, 57.2mm (NPT pipe threads comply with GB/T 2716-91)