The 627H21TBC1B belongs to the MKS Instruments 627H series of heated Baratron capacitance manometers. This model covers a 20 Torr full scale range for absolute vacuum measurement. Its sensor head stays controlled at 45°C, which stabilizes output and limits drift caused by ambient temperature changes. Therefore, the device suits mid-range vacuum processes in semiconductor, thin film, and industrial coating systems.
Furthermore, the unit uses an 8 VCR female fitting for leak-tight metal sealing on high-purity gas lines. Vertical calibration supports consistent readings in the intended mounting orientation. A 15-pin D-sub connector with thread locks secures the electrical interface. Meanwhile, the compact body simplifies installation in tight vacuum chambers.
The 627H21TBC1B delivers precise absolute pressure measurement for mid-range vacuum control. Its accuracy of 0.12% of Reading covers non-linearity, hysteresis, and non-repeatability. Resolution reaches 0.001% of Full Scale, which enables fine process regulation. Warm-up time is only 2 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 version offers analog output only, so it has no trip relays. In addition, it omits the heater status LED found on other 627H variants.
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 0.002% FS/°C, and span temp coefficient is 0.02% of Reading/°C. Finally, the product carries CE compliance for European markets.
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 2 hours warm-up to reach rated accuracy. Route signal cables away from high-power lines to reduce noise. Finally, check the analog output against a reference gauge before process start.
1x MKS 627H21TBC1B heated Baratron transducer
1x 15-pin D-sub mating connector kit
1x Protective fitting cap
1x Installation and operation manual
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Q1: What pressure range does the 627H21TBC1B cover?
A: The 627H21TBC1B measures absolute pressure up to 20 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 or a heater status LED?
A: No. This version provides analog output only, with no trip relays and no heater status LED.
Q4: How long is the warm-up time?
A: Warm-up takes 2 hours to reach full specified accuracy.
Q5: What fitting does this model use?
A: It uses an 8 VCR female fitting for leak-tight, high-purity connections.
| Brand Name | |
| Model No. | 627H21TBC1B |
| Product Type | Heated Absolute Pressure Transducer |
| hasMerchantReturnPolicy | Adjust according to reality |
| Shippingdetails | Adjust according to reality |
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