MKS Instruments 622 Baratron Pressure Transducers — 622A12TAE

Technical Dossier

Product Details And Specifications

MKS Instruments 622 Baratron Series: Comprehensive Module Range and Technical Overview

The MKS 622 Baratron capacitance manometer series is one of the most widely deployed absolute pressure measurement platforms in global heavy industry and semiconductor process environments. Installed across chemical vapor deposition (CVD) chambers, etch tools, diffusion furnaces, petrochemical reactors, nuclear facility gas handling systems, and offshore refinery process lines, the 622 series has established a reference-grade position in applications where measurement accuracy, thermal stability, and process isolation are non-negotiable. Its Inconel-based sensor diaphragm and all-metal wetted surfaces make it the standard choice for corrosive, high-purity, and reactive gas environments. The series covers full-scale ranges from 1 Torr to 1000 Torr, with output signals compatible with both analog (0–10 VDC) and RS-232/RS-485 digital interfaces depending on variant.

The Evolution of 622 Baratron Architecture

The Baratron capacitance manometer concept was introduced by MKS Instruments in the 1960s, with the 622 platform representing the mature, industrially hardened evolution of that original design. Early-generation Baratron sensors used ceramic-based diaphragm assemblies with limited chemical compatibility. The 622 series transitioned to all-Inconel wetted construction, enabling deployment in fluorine, chlorine, and other halogen-bearing process streams without sensor degradation.

Through successive hardware revisions, MKS standardized the 622 platform around a 4-pin MS connector interface and a +/-15 VDC dual-supply power architecture. Later variants introduced temperature-controlled sensor heads (heated versions, designated by suffix codes such as B for 45 degrees C and C for 100 degrees C) to prevent condensation of process gases on the diaphragm — a critical requirement in MOCVD and ALD applications. The 622 series has entered the mature/end-of-active-production phase for many sub-variants; MKS now positions the 628D and 722B series as functional successors. However, the installed base of 622-series instruments in legacy fabs and chemical plants remains substantial, and long-term maintenance support for these units continues to be a primary procurement driver.

622 Baratron Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly sourced models within the MKS 622 Baratron series, organized by full-scale pressure range and thermal configuration.

Absolute Pressure Transducers — Standard (Unheated) Variants

• 622A01TAE: 1 Torr full-scale, Inconel diaphragm, 0–10 VDC analog output, MS connector
• 622A02TAE: 2 Torr full-scale, all-metal wetted path, standard temperature, analog output
• 622A05TAE: 5 Torr full-scale, corrosive gas compatible, 4-pin MS connector interface
• 622A10TAE: 10 Torr full-scale, Inconel sensor, +/-15 VDC supply, analog 0–10 VDC output
• 622A12TAE: 12 Torr full-scale, all-metal wetted construction, standard body, analog output — primary SKU for this listing
• 622A20TAE: 20 Torr full-scale, process isolation diaphragm, MS connector, analog signal
• 622A50TAE: 50 Torr full-scale, Inconel wetted surfaces, suitable for reactive gas service
• 622A100TAE: 100 Torr full-scale, standard unheated body, 0–10 VDC output, MS connector
• 622A200TAE: 200 Torr full-scale, corrosive-compatible, analog output, industrial process use
• 622A500TAE: 500 Torr full-scale, Inconel diaphragm, broad range process pressure monitoring
• 622A1000TAE: 1000 Torr full-scale, maximum range variant, analog output, MS connector

Heated Body Variants (45 degrees C Sensor Head)

• 622B01TAE: 1 Torr, 45 degrees C heated sensor head, prevents condensation in reactive gas streams
• 622B10TAE: 10 Torr, 45 degrees C heated body, MOCVD and ALD process compatible
• 622B100TAE: 100 Torr, 45 degrees C heated, all-metal wetted path, analog output

High-Temperature Heated Variants (100 degrees C Sensor Head)

• 622C01TAE: 1 Torr, 100 degrees C heated sensor, high-condensation-risk process environments
• 622C10TAE: 10 Torr, 100 degrees C heated body, fluorine and chlorine gas service rated
• 622C100TAE: 100 Torr, 100 degrees C heated, semiconductor etch and deposition tool compatible

Sourcing Hard-to-Find & Obsolete 622 Baratron Parts

As the 622 series has transitioned out of active MKS production for many sub-variants, procurement through standard distribution channels has become unreliable. Lead times from authorized distributors for legacy 622 models frequently exceed 16–26 weeks, and certain heated variants (622B and 622C suffix models) are no longer listed in active MKS price books.

DriveKNMS maintains a dedicated inventory of 622 Baratron units sourced through certified secondary market channels, including decommissioned semiconductor fab equipment, refinery instrumentation overhauls, and controlled surplus from OEM service depots. Each unit is individually cataloged by full part number, including range code, body type, and connector suffix. For facilities operating legacy CVD, etch, or gas handling systems with 622-series instruments, DriveKNMS provides a direct procurement path that bypasses standard distribution lead times. Inquiries with full part numbers, required quantities, and delivery timelines are processed within one business day.

Quality Control for the 622 Baratron Range

The 622 Baratron capacitance manometer presents specific verification challenges due to its precision diaphragm assembly and analog signal chain. DriveKNMS applies the following test protocol to all 622-series units prior to dispatch:

• Zero-point calibration verification: Each unit is evacuated to below 1x10-4 Torr and the zero-offset voltage is measured against the factory specification (typically less than +/-0.5% of full scale).
• Span accuracy check: Units are tested at 25%, 50%, and 100% of full-scale pressure using a NIST-traceable reference standard. Output linearity is verified against the published +/-0.5% accuracy specification.
• Supply voltage sensitivity test: Power supply rails (+/-15 VDC) are varied +/-5% to confirm output stability within specification limits.
• Connector and cable integrity inspection: MS connector pins are inspected for corrosion, deformation, and continuity. Mating torque is verified.
• Heated variant thermal cycling: For 622B and 622C heated-body units, the heater circuit is energized and sensor head temperature is confirmed to reach and stabilize at the rated setpoint (45 degrees C or 100 degrees C) within the specified warm-up period.
• Leak integrity check: Process port fittings are pressure-tested to confirm zero leakage at rated operating pressure.