MKS 627H.1TBD2B Heated Vacuum Transducer

Product Introduction

The 627H.1TBD2B belongs to the MKS Instruments 627H series of heated Baratron capacitance manometers. This model targets low-range absolute vacuum measurement down to 0.1 Torr full scale. Its sensor head stays controlled at 45°C, which stabilizes readings and reduces drift from ambient changes. Consequently, the device fits fine vacuum processes in semiconductor, analytical, and research environments.

Besides its precise sensor, the unit includes a heater status LED for quick visual confirmation of thermal control. Moreover, vertical calibration ensures consistent performance in the intended mounting orientation. The 8 VCR female fitting provides leak-tight metal-to-metal sealing for high-purity gas lines.

Technical Specifications

The 627H.1TBD2B delivers high-accuracy absolute pressure measurement for low-range vacuum. Its accuracy of 0.12% of Reading covers non-linearity, hysteresis, and non-repeatability. Resolution reaches 0.001% of Full Scale, which supports fine process control. Warm-up time is 4 hours, and calibration is performed in the vertical position.

The analog output provides 0 to +10 VDC into loads above 10 kOhm. Power requires +/-15 VDC (+/-5%) at 0.25 A maximum. A 15-pin D-sub connector with thread locks ensures secure wiring. This model offers analog output only, so it has no trip relays. Meanwhile, the heater status LED confirms the 45°C thermal control is active.

Mechanical and Environmental Parameters

The sensor diameter measures 3.15 in (80.0 mm), and body height is 3.87 in (98.4 mm). The stem adds 1.38 in (35.1 mm). Internal volume is only 6.3 cc, which supports fast response and low gas load. Wetted materials use Inconel for corrosion resistance in aggressive gas service.

The overpressure limit is 45 psia (310 kPa) or 120% of Full Scale, whichever is greater. Operating temperature ranges from 15 to 40°C. Zero temp coefficient is 0.005% FS/°C, and span temp coefficient is 0.02% of Reading/°C. Finally, the product carries CE compliance for European markets.

Installation Guide

First, verify the vacuum system is vented and at safe pressure before mounting. Install the 8 VCR female fitting with a compatible gasket and nut. Next, connect the 15-pin D-sub cable to the controller or readout device. Confirm the +/-15 VDC supply meets the 0.25 A requirement.

Moreover, keep the transducer in a vertical orientation, because calibration is performed in that position. Allow 4 hours warm-up to reach rated accuracy. Route signal cables away from high-power lines to reduce noise. Finally, check the heater status LED after power-up to confirm the 45°C control is working.

Packaging List

• 1x MKS 627H.1TBD2B heated Baratron transducer

• 1x 15-pin D-sub mating connector kit

• 1x Protective fitting cap

• 1x Installation and operation manual

Shipping via Fedex, UPS, or DHL. Transit time is typically 3-5 business days.

FAQ

Q1: What pressure range does the 627H.1TBD2B cover?
A: The 627H.1TBD2B measures absolute pressure up to 0.1 Torr full scale.

Q2: Why must the sensor stay in a vertical position?
A: The factory performs calibration in the vertical orientation, so mounting it vertically preserves rated accuracy.

Q3: Does this model include trip relays?
A: No. This version provides analog output only, with no solid-state trip relays.

Q4: What does the heater status LED indicate?
A: The LED confirms that the 45°C sensor heater is active and holding thermal control.

Q5: What fitting does this model use?
A: It uses an 8 VCR female fitting for leak-tight, high-purity connections.