Product Overview
The MKS 626A01TBE is a high-precision, absolute pressure capacitance manometer from the renowned MKS Instruments Baratron® series. This instrument is a specialized pressure transducer designed to deliver exceptional accuracy, stability, and repeatability in measuring low absolute pressures, typically in the vacuum and fine process pressure ranges. Operating on the fundamental capacitance manometry principle, the MKS 626A01TBE utilizes a tensioned metal diaphragm that deflects minimally in response to applied pressure, changing the capacitance between the diaphragm and fixed electrodes. This change in capacitance is electronically converted into a highly precise and linear analog output signal, most commonly 0-10V DC. The “TBE” suffix in the model number 626A01TBE typically denotes specific features such as a particular pressure range, electrical connector type (e.g., a “B” connector), and output signal.As a Baratron gauge, the MKS 626A01TBE is engineered for demanding applications where pressure measurement integrity is critical to process results. It is insensitive to gas composition, meaning its reading is not affected by the type of gas being measured—a significant advantage over thermal conductivity gauges (like Pirani gauges). This makes it the gold standard for applications involving mixed gases, vapors, or frequently changing process chemistries. The unit is designed for clean, dry, non-corrosive gases and is a staple in environments where measurement drift and long-term stability are paramount. The value of the MKS 626A01TBE lies in its ability to provide a fundamental, highly repeatable pressure measurement that serves as a reliable process variable for closed-loop control, process monitoring, and data logging in critical manufacturing and research applications.
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 626A01TBE |
| Manufacturer | MKS Instruments |
| Product Series | Baratron Series 626A |
| Product Type | Capacitance Manometer (Absolute Pressure Transducer) |
| Pressure Range | Typically 0-10 Torr or 0-1000 mTorr (Specific to the “01” code; verify with datasheet) |
| Accuracy | Typically ±0.12% of reading or better (for specific models) |
| Output Signal | Analog: 0-10V DC (standard for TBE models) |
| Input Power | Typically ±15V DC regulated |
| Pressure Connection | 1/4″ VCR® or CF flange, compatible with ultra-high vacuum systems |
| Diaphragp Material | Hastelloy C-276 or 316L Stainless Steel (for corrosion resistance) |
| Wetted Materials | 316L Stainless Steel, Hastelloy C-276, Inconel, Gold, Viton® (model specific) |
| Zero Stability | Exceptional long-term zero stability |
| Repeatability | Typically ±0.02% of reading |
| Operating Temperature | 40°C to 65°C (Electronics temperature) |
| Process Temperature | Up to 100°C or 120°C (depending on model) |
Main Features and Advantages
The MKS 626A01TBE is distinguished by its unparalleled accuracy and gas composition independence. Unlike gauges that rely on thermal properties, the capacitance manometer principle provides a direct, fundamental measurement of pressure based on physical displacement, resulting in readings that are inherently linear and unaffected by the thermal conductivity or molecular weight of the gas. This eliminates the need for gas-specific correction factors, a major source of error in other technologies. The 626A01TBE offers exceptional zero stability, meaning its reading at true zero pressure remains consistent over time, which is critical for maintaining measurement integrity and minimizing the need for frequent zero calibrations in sensitive processes.
