E29H.1TBFL1B MKS E29H Etch Baratron Gauge

MKS E29H.1TBFL1B | Heated Etch Sensor Baratron Pressure Transducer

Etch process environments place demanding requirements on vacuum pressure measurement. Process byproducts can accumulate on exposed sensing surfaces and affect long-term zero stability.

The MKS Instruments E29H.1TBFL1B addresses this challenge with a specialized heated Etch Sensor design. It belongs to the MKS E29H Series (600 Series) and provides absolute pressure measurement across a 0.1 Torr full-scale range.

The instrument maintains its sensor temperature at 100°C. Its patented integrated sump structure helps protect the sensing diaphragm from process byproduct deposition. This design supports demanding semiconductor etch applications.

The transducer provides a 0–10 VDC analog output through a 9-pin D-sub connector. Its 8 VCR female process fitting supports compatible high-purity vacuum connections.

The E29H.1TBFL1B also offers full compatibility with earlier MKS 629 and E29 Baratron manometers, according to the supplied product specifications.

01 | Product Identity and Engineering Positioning

Identification	Specification
Manufacturer	MKS Instruments
Complete Model	E29H.1TBFL1B
Product Family	E29H Series
Platform	600 Series
Product Type	Heated Etch Sensor Baratron Pressure Transducer
Measurement Principle	Capacitance Manometer
Measurement Reference	Absolute Pressure
Full-Scale Range	0.1 Torr
Controlled Sensor Temperature	100°C
Calibration Orientation	Vertical
Process Connection	8 VCR Female
Electrical Connection	9-pin D-sub with thread locks
Etch Protection	Integrated patented sump

02 | Etch Sensor Technology and Structural Advantages

The defining feature of the E29H Series is its specialized etch sensor construction. The integrated sump addresses contamination risks in reactive process environments.

Design Feature	Engineering Function
Heated Sensing Assembly	Maintains a controlled sensor temperature of 100°C.
Etch Sensor Structure	Addresses process byproduct accumulation around the sensing diaphragm.
Integrated Sump	Helps prevent process deposits from reaching the isolation diaphragm.
Inconel Wetted Materials	Provides the specified process-contact material construction.
Capacitance Measurement	Measures absolute pressure through diaphragm displacement.

Patented Design: The integrated sump incorporates patented technology under US Patent No. 5,822,685.

In etch applications, deposited process residues can alter diaphragm behavior and contribute to measurement drift. The sump design helps limit this exposure and supports more consistent pressure monitoring.

03 | Configuration Breakdown – Ordering Code Structure

The complete ordering number identifies the instrument family, pressure range, unit, and selected hardware configuration. The following tree separates confirmed specifications from code interpretations requiring original manufacturer documentation.

Code Segment	Configuration Category	Identification
E29H	Product Family	MKS heated Etch Sensor Baratron family
.1	Full-Scale Code	0.1 Torr range configuration
T	Pressure Unit	Torr
B	Thermal Configuration Code	Requires confirmation against the original ordering code table; supplied specification states 100°C
F	Process Connection Code	Supplied configuration specifies 8 VCR female
L1B	Electrical and Factory Configuration	Supplied configuration specifies 9-pin D-sub and vertical calibration

Complete Ordering Number:

• E29H – Heated Etch Sensor product family
• .1T – 0.1 Torr pressure range
• B – Configuration code requiring manufacturer verification
• F – Connection configuration associated with the supplied 8 VCR female specification
• L1B – Additional electrical and factory configuration identifier

Ordering Note: Do not infer the heater temperature, connector pin count, or calibration orientation from individual suffix characters alone. Confirm these details against the complete manufacturer ordering documentation.

04 | Measurement Performance and Accuracy

The low-range sensing configuration supports precise absolute pressure monitoring. Its specified accuracy includes non-linearity, hysteresis, and non-repeatability.

Measurement Parameter	Specification
Measurement Type	Absolute Pressure
Full-Scale Range	0.1 Torr
Accuracy	0.50% of Reading
Accuracy Components	Non-linearity, hysteresis, and non-repeatability
Resolution	0.001% F.S.
Equivalent Resolution	0.000001 Torr
Sensor Temperature	100°C controlled
Warm-Up Time	4 hours
Calibration Orientation	Vertical

Measurement Interpretation: The 0.50% of Reading specification describes accuracy. The 0.001% F.S. value describes resolution. Resolution does not represent guaranteed measurement accuracy.

05 | Thermal Characteristics and Operating Conditions

The heated assembly maintains a controlled sensor temperature of 100°C. This thermal arrangement supports measurement stability in semiconductor process environments.

Thermal Parameter	Value
Controlled Sensor Temperature	100°C
Ambient Operating Temperature	15 to 40°C
Warm-Up Time	4 hours
Zero Temperature Coefficient	0.01% F.S./°C
Span Temperature Coefficient	0.02% of Reading/°C

Engineering Consideration: The internal sensor temperature differs from the surrounding ambient temperature. Maintain the specified ambient range during operation.

06 | Electrical Interface and Signal Characteristics

The instrument uses a voltage-based analog output. It supports integration with compatible PLC analog input modules and industrial data acquisition systems.

Electrical Parameter	Specification
Power Supply	±15 VDC, ±5%
Maximum Current	0.50 A
Analog Output	0 to +10 VDC
Output Load	Greater than 10 kΩ
Electrical Connector	9-pin D-sub
Connector Retention	Thread locks
Trip Point Outputs	Not available
Heater Status LED	Not available

Integration Recommendations:

• Provide a regulated ±15 VDC power source.
• Verify the available supply current before installation.
• Use an analog input compatible with 0–10 VDC signals.
• Maintain an input impedance above 10 kΩ.
• Check the 9-pin D-sub pin assignment before wiring.
• Apply appropriate signal shielding and grounding practices.
• Do not expect relay outputs or local heater status indication.

07 | Process Interface and Mechanical Construction

The 8 VCR female connection supports high-purity process gas plumbing. Inconel forms the specified wetted material construction.

Mechanical Parameter	Specification
Process Fitting	8 VCR Female
Wetted Materials	Inconel
Internal Volume	6.3 cc
Overpressure Limit	45 psia (310 kPa)
Body Diameter	3.15 in (80.0 mm)
Body Height	3.87 in (98.4 mm)
Stem Length	1.38 in (35.1 mm)
Compliance	CE compliant

Mechanical Installation: Verify fitting compatibility, sealing surfaces, and installation clearance. Use suitable VCR connection components for the process system.

08 | Installation and Commissioning Procedure

Correct installation helps preserve the calibrated measurement condition. The following sequence supports systematic equipment commissioning.

1. Verify the Model: Confirm the complete E29H.1TBFL1B ordering number.
2. Check the Range: Verify the 0.1 Torr full-scale requirement.
3. Confirm Orientation: Install according to the vertical calibration specification.
4. Inspect the Fitting: Check the 8 VCR female connection and mating components.
5. Prepare the Process Line: Remove contamination from the connection surfaces.
6. Complete Mechanical Installation: Follow the appropriate VCR installation procedure.
7. Connect Power: Apply the specified ±15 VDC supply.
8. Connect the Signal: Verify the 9-pin D-sub wiring and analog input configuration.
9. Allow Thermal Stabilization: Complete the four-hour warm-up period.
10. Validate Measurement: Compare the output against a suitable calibrated reference.

09 | Maintenance and Process Reliability

Etch process byproducts can influence vacuum sensing performance. Maintenance should focus on process cleanliness, thermal stability, and signal integrity.

Maintenance Focus	Engineering Action
Etch Residue	Inspect the process system for abnormal deposition or contamination.
Vacuum Connection	Check VCR sealing surfaces and connection integrity.
Zero Stability	Verify reference pressure and calibration conditions.
Thermal Stabilization	Allow the specified four-hour warm-up period.
Electrical Integrity	Inspect supply voltage, grounding, and analog wiring.
Measurement Verification	Compare readings against an independent reference instrument.

Service Recommendation: Avoid unauthorized disassembly of the sensing assembly. Follow MKS procedures when cleaning, inspecting, or recalibrating the instrument.

10 | System Compatibility and Replacement Applications

The E29H.1TBFL1B targets semiconductor vacuum applications that require low-pressure monitoring under etch process conditions.

• Semiconductor plasma etching equipment
• Reactive ion etching process systems
• Vacuum chamber pressure monitoring
• Semiconductor process gas equipment
• High-purity vacuum assemblies
• Compatible MKS Baratron instrumentation systems

Legacy Compatibility: The supplied specification identifies full compatibility with earlier MKS 629 and E29 Baratron manometers. Verify the complete electrical and mechanical configuration before replacement.

Replacement Checklist:

• Confirm the 0.1 Torr full-scale range.
• Verify the absolute pressure measurement requirement.
• Check the 100°C sensor temperature specification.
• Confirm the 8 VCR female process connection.
• Match the 9-pin D-sub electrical interface.
• Verify the ±15 VDC power requirement.
• Preserve the vertical calibration orientation.

11 | Certifications and Compliance

• CE Compliance: The specified model is CE compliant.
• Pressure Measurement: Absolute capacitance measurement.
• Process Construction: Inconel wetted materials.
• Process Connection: 8 VCR female.
• Patented Etch Design: US Patent No. 5,822,685.

Request the applicable manufacturer's declaration and supporting technical documents when your project requires formal compliance verification.

12 | Five Professional Engineering FAQs

Q1: Why does an etch-specific pressure transducer need an integrated sump?

A: Etch processes can generate byproducts that migrate through the vacuum system. The integrated sump helps limit their accumulation on the isolation diaphragm. This reduces one potential source of measurement drift and maintenance problems.

Q2: What should engineers consider when replacing an older MKS 629 or E29 instrument?

A: Check the mounting arrangement, fitting dimensions, electrical pinout, pressure range, and analog signal requirements. The stated legacy compatibility does not eliminate the need to verify the installed system configuration.

Q3: How should maintenance teams investigate gradual zero drift in an etch chamber?

A: First, inspect process contamination and vacuum connection integrity. Then verify the warm-up period and compare the reading with an independent reference. Avoid assuming that every zero shift indicates an electronic failure.

Q4: Is the E29H suitable for applications that require a local heater-ready indicator?

A: This configuration does not include a heater status LED. If operators require local heater indication, select a model with a confirmed indicator function or provide an appropriate external monitoring solution.

Q5: How should procurement teams choose between an E29H and a standard heated Baratron?

A: Consider the process chemistry and deposition risk first. An etch-specific sensing structure offers a design advantage where process byproducts threaten diaphragm cleanliness. Also compare range, sensor temperature, fittings, accuracy, and electrical configuration.

13 | Commercial Terms and Ordering Information

We support semiconductor equipment maintenance, vacuum instrumentation replacement, and industrial automation procurement.

Commercial Information	Details
Manufacturer	MKS Instruments
Model	E29H.1TBFL1B
Series	E29H / 600 Series
Product Type	Heated Etch Sensor Baratron
Measurement Range	0.1 Torr
Sensor Temperature	100°C
Process Connection	8 VCR Female
Warranty	12 months
Shipping Methods	FedEx / UPS / DHL

12-Month Warranty: We provide a 12-month warranty against covered product defects, subject to the agreed sales terms and warranty conditions.

International Delivery: We support FedEx, UPS, and DHL shipping options. Delivery arrangements depend on destination and order confirmation.

Request a Quotation: Contact our sales team for pricing, availability, lead time, and technical support. Provide the complete model number and process requirements to help verify the correct configuration.

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