Description

The MKS 902‑1112 is a high‑performance absolute piezo vacuum transducer from MKS Instruments, a global leader in vacuum measurement and process control technologies . Designed for accurate pressure measurement from atmosphere down to 0.1 Torr, this device belongs to the 902 Series and utilizes MEMS‑based piezoresistive sensor technology enclosed in a corrosion‑resistant 316 stainless steel housing . The MKS 902‑1112 provides both a 0‑10 VDC linear analog output (10 mV/Torr) and an RS‑485 digital interface, making it an ideal choice for integration into PLCs, DCS, and industrial automation systems requiring reliable, gas‑type‑independent vacuum monitoring .

Application Scenarios

In a semiconductor fabrication facility, precise chamber pressure control is critical for achieving consistent thin‑film deposition and etch rates. The MKS 902‑1112 is deployed in PVD and CVD process chambers to provide real‑time absolute pressure feedback to the system controller . Because its piezoresistive measurement principle is independent of gas composition, the MKS 902‑1112 delivers accurate readings even when process gas mixtures vary—a key advantage over thermal conductivity gauges that can drift with gas type changes . This addresses the critical pain point of process variability, enabling tighter process control and higher product yields.

In a pharmaceutical freeze‑drying (lyophilization) application, the MKS 902‑1112 monitors the vacuum level during the primary drying phase to ensure optimal sublimation conditions . The sensor’s compact KF16 flange design allows easy installation on the lyophilizer chamber, while its robust stainless steel construction withstands the moisture and cleaning cycles typical of pharmaceutical environments. The combination of analog output for legacy control systems and RS‑485 digital communication for modern SCADA integration allows seamless integration into both new and existing equipment.

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