Description
Product Introduction
The MKS Instruments 223BD-00001AAB is a precision-engineered differential pressure transducer designed for critical process monitoring in semiconductor manufacturing, thin-film deposition, and industrial leak detection systems. Built with an Inconel® sensing diaphragm, the 223BD provides gas-independent measurement accuracy, eliminating the calibration shifts common in thermal or piezoresistive gauges when gas composition changes.
The 223BD-00001AAB configuration features a 1 Torr full-scale differential range, converting small pressure deltas across vacuum lines into a linear 0 to 10 VDC output signal. Replacing a drifted or contaminated sensor with a calibrated 223BD unit restores tight loop control in mass flow controller (MFC) verification, laminar flow cleanrooms, and low-pressure chamber gas delivery manifolds.
Key Technical Specifications
| Parameter | Value |
| Model Code | 223BD-00001AAB |
| Manufacturer | MKS Instruments |
| Full-Scale Range | 1 Torr (1.33 mbar / 0.019 PSI) |
| Measurement Type | Differential Pressure (Variable Capacitance) |
| Accuracy | ±0.5% of Reading (standard line accuracy) |
| Input Power | ±15 VDC (±5% regulated) |
| Output Signal | 0 to 10 VDC linear into >10kΩ load |
| Wetted Materials | Inconel® & 300-series Stainless Steel |
| Process Connectors | 1/2″ O.D. Straight Tubing (standard smooth port) |
| Electrical Connector | 5-pin / 9-pin D-sub or terminal strip depending on pinout option |
Application Scenarios & The “Trench” Experience
During high-volume semiconductor etching, slight variations in differential pressure across mass flow control manifolds can ruin process uniformity. If a sensor’s internal diaphragm loses zero calibration due to thermal stress or particle deposition, the tool’s automated safety interlocks will reject the process batch. Swapping in a pre-calibrated MKS 223BD-00001AAB restores sub-Torr accuracy to your mass flow loop within minutes, avoiding costly tool downtime and lost wafer yields.
Typical Applications:
- Semiconductor & Solar Cell Manufacturing – Precision monitoring of gas manifold pressure drops and vacuum process chamber isolation.
- Flow Measurement & Calibration Rigs – Serves as a primary differential pressure reference across laminar flow elements.
- Leak Detection Systems – Detects minute pressure decay rates across sealed volumes in automotive and pharmaceutical test cells.
223BD-00001AAB
223BD-00001AAB
Transparency SOP: Quality Assurance & Testing
Every surplus or reconditioned MKS 223BD-00001AAB sensor undergoes a 5-step bench verification process before shipment:
- Physical & Diaphragm Audit: Visual inspection of wetted tube ports, body seals, and electrical pins for signs of corrosive residue or mechanical strain.
- Zero-Point & Vacuum Verification: Pumped down on a calibration bench to establish reference zero and verify offset stability under deep vacuum.
- Multi-Point Pressure Sweep: Calibrated against a certified reference standard at 0%, 25%, 50%, 75%, and 100% of the 1 Torr full-scale range.
- Output Linearity & Noise Check: Oscilloscope monitoring of the 0–10V analog output line to ensure zero microphonic noise or signal jitter.
- ESD Cleaning & Cleanroom Pack: Decontaminated, sealed with protective port caps, and vacuum-bagged in ESD shielding material.
The Veteran’s Tech Trap Guide (Crucial Value-Add)
⚠️ Allow Thermal Warm-up Time: Capacitance manometers rely on thermally stable internal electronics. Always allow the 223BD-00001AAB to warm up under power for at least 15 to 30 minutes before performing zero adjustments or taking process critical readings.
❗ Avoid Mechanical Strain on Tube Ports: When clamping or welding fittings onto the 1/2″ straight tube connectors, do not apply bending torque to the outer housing. Excessive strain can deform the internal sensing cavity, distorting zero calibration.
⚠️ Verify Power Supply Rail Voltage: Operating the unit on noisy or unbalanced ±15 VDC supply rails will introduce DC offset errors into your 0–10V signal output. Ensure your power supply outputs are within ±5% before connecting the harness.
Frequently Asked Questions (FAQ)
Q: Is the MKS 223BD-00001AAB gas-dependent?
A: No. Because it measures pressure via the physical deflection of an Inconel diaphragm, the reading is completely independent of the gas composition being measured.
Q: What does the “00001” mean in the part number?
A: In the MKS Baratron numbering system, 00001 specifies the full-scale pressure range—in this case, 1 Torr. The subsequent characters (AAB) define the fitting type, accuracy class, and connector pinout options.
Q: Can I zero the sensor in the field?
A: Yes. The sensor features an accessible zero potentiometer on the top housing. Ensure the differential ports are completely equalized or under high vacuum before turning the zero screw to set the output to 0.000 VDC.
Q: What warranty is provided with this sensor?
A: We provide a full 12-month operational warranty. If the unit fails calibration or exhibits signal drift within 365 days, we will replace the unit or issue a full refund.
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