627BRETDD2P MKS Instruments Baratron 627B Vacuum Gauge

Engineering Overview

The 627BRETDD2P is a high-precision, heated absolute capacitance manometer engineered by MKS Instruments within the renowned Baratron® Type 627B series. Designed for demanding semiconductor fabrication and ultra-clean vacuum processes, this sensor delivers independent total pressure measurement with exceptional thermal stability.

Core Technical Specifications

• Brand: MKS Instruments
• Model / Part Number: 627BRETDD2P
• Series: Baratron® Type 627B Series
• Module Type: Heated Absolute Capacitance Manometer Vacuum Gauge
• Full Scale Range: 33.33 Pa (0.25 Torr / 250 mTorr)
• Measurement Accuracy: ±0.15% of reading
• Internal Control Temperature: 45°C stable constant temperature housing
• Power Supply Requirement: ±15 VDC (≤ 250 mA) dual rail power
• Analog Output Signal: 0 to 10 VDC linear pressure output
• Wetted Materials: Inconel® 600 nickel-based alloy for corrosion resistance
• Electrical Connector: 15-pin D-sub type with slide locks
• Process Connection: NW-16-KF (KF16 quick-release flange)

Model Code Configuration Breakdown (627B - RE - T - D - D - 2 - P)

• 627B: 45°C temperature-controlled absolute capacitance gauge base
• RE: 33.33 Pa (0.25 Torr) full-scale pressure range option
• T: Metric calibration / pressure unit scale format
• D: NW-16-KF vacuum process flange fitting
• D: ±0.15% measurement accuracy class
• 2: Integrated heater status and operational LED indicator
• P: 15-pin D-sub connector configuration with slide locks

Warranty & Express Logistics Support

• Warranty Protection: Fully covered by a 12-month operational quality warranty.
• Express Global Shipping: Rapid dispatch worldwide via trusted couriers including FedEx, UPS, and DHL.

Frequently Asked Questions (FAQ)

Q: Why does the 627BRETDD2P require a dedicated warm-up period before recording process pressures?

A: The internal heater must stabilize at precisely 45°C to eliminate ambient thermal fluctuations; allowing 2 to 4 hours of warm-up prevents baseline zero drift during ultra-low-pressure readings.

Q: What installation orientation is recommended to achieve factory calibration accuracy?

A: The sensor should be mounted in a strict vertical position with the vacuum process port facing downward to minimize gravitational mechanical stress on the delicate internal diaphragm.

Q: Is the 627BRETDD2P affected by the chemical composition of process chamber gases?

A: No, Baratron capacitance manometers measure true total absolute pressure independently of gas composition, making them immune to gas-dependent thermal conductivity errors.

Q: How can technicians verify if the internal 45°C heater circuit has reached operational readiness?

A: The integrated status LED indicator (designated by suffix code 2) will illuminate to confirm that the internal temperature control loop has stabilized at its set point.

Q: What selection criteria matter most when replacing legacy low-range vacuum gauges with this model?

A: Always verify your maximum operating pressure against the 33.33 Pa (0.25 Torr) full-scale limit, confirm your controller provides clean ±15 VDC power, and match the KF16 flange size to your existing foreline or chamber port.

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