Pressure Sensing Diaphragm: Accuracy ±0.1% to ±0.5% FS

Q: What is the difference between bonded and welded diaphragms?

Bonded diaphragms have strain gauges attached with adhesive, suitable for moderate temperatures. Welded diaphragms use laser or electron beam welding for hermetic sealing, offering better performance in high-temperature or corrosive environments.

Q: How does diaphragm thickness affect sensor performance?

Thinner diaphragms increase sensitivity but reduce pressure range and durability. Thicker diaphragms handle higher pressures with lower sensitivity. Optimal thickness balances range, sensitivity, and natural frequency requirements.

Q: What maintenance is required for pressure sensing diaphragms?

Regular inspection for corrosion, pitting, or deformation; cleaning to prevent media buildup; calibration checks to ensure accuracy; replacement if damage exceeds manufacturer specifications.

Component Specifications

Definition

A pressure sensing diaphragm is a thin, flexible membrane that deforms elastically under applied pressure differentials. This mechanical displacement is typically measured using strain gauges, capacitive plates, or optical systems to quantify pressure values with high accuracy. It serves as the primary sensing element in many pressure transducers and transmitters, isolating the measurement system from process media while providing reliable response across specified pressure ranges.

Working Principle

The diaphragm deflects proportionally to applied pressure due to its elastic properties. This deflection changes electrical characteristics (resistance in strain gauge types, capacitance in capacitive types) or optical properties, which are converted to standardized output signals (4-20mA, 0-10V, digital protocols) through signal conditioning electronics.

Materials

Stainless steel (316L, 17-4PH), Hastelloy, Monel, Inconel for corrosive environments; Silicon for MEMS sensors; Elastomers (FKM, EPDM) for low-pressure applications; Ceramic (Al2O3) for high-temperature/high-corrosion resistance

Technical Parameters

Parameter	Typical range	Notes & selection driver
Accuracy	±0.1% to ±0.5% FS
Hysteresis	<0.1% FS
Nonlinearity	<0.2% FS
Overpressure	150% to 300% of rated pressure
Burst Pressure	300% to 500% of rated pressure
Pressure Range	0-10 bar to 0-700 bar typical
Natural Frequency	500 Hz to 5 kHz
Operating Temperature	-40°C to +125°C (standard), up to +400°C (special)

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 11295, ISO 4378, DIN 16086, DIN 3852

Parent Products

This component is used in the following industrial products

Pressure Sensor/Transducer

A device that converts pressure into an electrical signal for measurement and control.

View Product Details

Pneumatic Converter

A device that converts pneumatic signals to other forms of control signals within a valve control system.

View Product Details

Engineering Analysis

Risks & Mitigation

Diaphragm rupture under overpressure
Creep deformation over time
Corrosion from process media
Fatigue failure from cyclic loading
Temperature-induced zero shift

FMEA Triads

Trigger: Exposure to pressure beyond rated burst pressure
Failure: Diaphragm rupture leading to process leakage and sensor failure
Mitigation: Install pressure relief valves, use diaphragms with higher burst ratings, implement pressure limit alarms

Trigger: Cyclic pressure loading near natural frequency
Failure: Fatigue cracking and premature failure
Mitigation: Select diaphragms with appropriate natural frequency, avoid resonant conditions, use dampening systems

Trigger: Chemical attack from corrosive process media
Failure: Thinning, pitting, or perforation of diaphragm
Mitigation: Select compatible materials (Hastelloy, Tantalum), use protective coatings, implement chemical compatibility testing

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.1% to ±0.5% of full scale depending on accuracy class

Test Method

Deadweight tester calibration, comparison against reference standards, hysteresis testing, temperature cycling, overpressure testing per ISO 11295

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Pressure Sensing Diaphragm

Manufacturer profiles associated with Pressure Sensing Diaphragm.

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Frequently Asked Questions

What is the difference between bonded and welded diaphragms?