Dual Flange Differential Pressure Transmitter

YK-A60-EF

Dual Flange Differential Pressure Transmitter

The dual-flange differential pressure transmitter consists of two main parts: the measuring capsule assembly and the electronic signal processing unit. The capsule assembly includes two flanges connected to the high-pressure (HP) and low-pressure (LP) sides of the process—for example, in tank level measurement, the HP flange connects to the tank bottom (subjected to liquid hydrostatic + vapor pressure) and the LP flange to the tank top (vapor pressure only), so their pressure difference corresponds to liquid height. Each flange houses a high-precision sensor (typically capacitive or diffused silicon type) sealed behind an isolation diaphragm, linked via capillaries filled with silicone oil to the transmitter body. The differential pressure deflects the sensor’s diaphragm, altering capacitance (in capacitive types) or resistance (in diffused silicon types) proportionally. This minute change is processed through amplification, temperature compensation, and linearization circuits to produce a standard output (e.g., 4–20 mA DC or digital HART/RS485); for instance, a 0–100 kPa DP range maps linearly to 4–20 mA, where 4 mA = 0 kPa and 20 mA = 100 kPa.

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technology parameter

Structure Form	Split Type	Connection Method	Flange, Bracket
Housing Material	SUS304, SUS316, Cast Aluminum Alloy	Flange Material	SUS316L
Electrode Material	316L, Hastelloy C-276, Hastelloy C, Tantalum	Ambient Temperature	-25 ~ 70℃
Process Temperature	-25 ~ 100℃	Applicable Pressure	-100-100kPa, -500-500kPa
Accuracy	±0.075%	Electrical Interface	M20×1.5 (Negotiable)
Output Mode	4~20mA, HART Protocol, RS485	Protection Grade	IP65, IP66
Certification	Intrinsically Safe, Flameproof	Power Supply Voltage	24VDC

Selection

Measurement Task
Temperature Range

A:≤80℃; B:≤120℃; C:≤200℃; D:≤300℃; E:≤400℃;
Span

A:-10–1kPa; B:0–5kPa; C:0–10kPa; D:0–50kPa; E:0–100kPa; F:0–1.6MPa; G:0–2.5MPa; H:0–3.2MPa; J:0–10MPa; Z:Customized;
Wetted Parts Material

A:316L; B:Hastelloy; C:Tantalum (TAN);
Output Signal

A:4–20mA;
Process Connection Size

A:DN20; B:DN25; C:DN32; D:DN40; E:DN50; F:DN65; G:DN80; H:DN100; V:M20×1.5; P:1/2NPT; S:G1/2; Z:Other;
Accuracy Class

A:0.075%F.S; B:0.1%F.S; C:0.25%F.S; D:0.5%F.S;
Explosion-Proof Rating

A:Standard; B:Explosion-proof; C:Intrinsically Safe;
Electrical Conduit Entry Size

A:M20×1.5; B:G1/2 NPT internal thread; C:1/2 NPT internal thread; D:Other;
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