SEC-E431X SEC-E Series HORIBA STEC High-Flow Gas Controller

SEC-E431X | High-Flow Economy Gas Control Solution

The SEC-E431X is an economy-type Mass Flow Controller from the HORIBA STEC SEC-E Series. It uses a solenoid valve to regulate high-flow delivery of non-corrosive process gases.

Its nitrogen-equivalent full-scale flow range covers 50 to 100 SLM. This configuration addresses gas distribution requirements in bulk gas panels and industrial process equipment.

The controller combines analog voltage control with a normally closed solenoid valve. Its standard unheated construction simplifies integration into compatible gas delivery assemblies. The design emphasizes practical flow regulation, straightforward electrical connections, and economical system configuration.

01 | Product Configuration at a Glance

02 | Flow Regulation and Measurement Performance

The SEC-E431X provides a 5–100% FS control range. Its accuracy and repeatability specifications define the expected flow regulation performance.

Engineering Note: Accuracy and repeatability use full-scale references. Evaluate these specifications against the actual operating flow rather than assuming identical percentage-of-reading performance at every setpoint.

03 | Pressure Envelope and Gas Compatibility

This instrument targets non-corrosive gas delivery. Engineers must verify gas compatibility and pressure conditions before selecting the unit.

Do not interpret the pressure resistance rating as a continuous operating pressure. Keep the inlet and differential pressures within their respective operating limits.

04 | Solenoid Valve and Wetted Material Design

The valve assembly uses an electromagnetic solenoid mechanism. Its normally closed configuration provides a defined valve state when electrical power is removed.

Check the chemical compatibility of Viton, PTFE, and stainless steel with the selected gas. Do not assume compatibility with corrosive or reactive process media.

05 | Analog Control and Electrical Requirements

The electrical interface uses analog voltage signals. This arrangement supports integration with compatible gas control systems and equipment controllers.

Control Integration Checklist:

• Verify the host controller supports the specified analog voltage ranges.
• Check the positive and negative supply rails before connection.
• Confirm D-Sub connector pin assignments using the applicable wiring documentation.
• Check signal grounding and cable routing to reduce electrical interference.
• Verify the PLC or equipment controller scaling against the selected full-scale range.

06 | Mechanical Dimensions and Piping Interface

The compact housing supports installation in high-flow gas distribution assemblies. The 3/8-inch Swagelok connection requires suitable manifold and tubing compatibility.

Reserve adequate space for tubing installation and connector access. Check fitting alignment before finalizing the gas panel layout.

07 | Operating Temperature and Installation Conditions

For applications requiring the specified accuracy, maintain the instrument within 15–35°C. Temperature changes outside this guaranteed range may affect measurement performance.

08 | Typical Industrial Applications

The HORIBA STEC SEC-E431X targets economical, high-flow gas regulation in compatible industrial installations.

• Bulk Gas Panels: Regulates non-corrosive gas distribution across high-flow supply systems.
• Semiconductor Gas Delivery: Supports compatible process gas supply configurations.
• Industrial Gas Cabinets: Provides analog-controlled flow regulation for equipment integration.
• Process Gas Distribution: Handles selected gases within the specified pressure and material limits.
• High-Flow Equipment: Supports applications requiring 50–100 SLM nitrogen-equivalent capacity.

09 | Installation and Commissioning Procedure

Proper installation requires coordinated checks of the gas circuit, electrical supply, and mechanical connections.

1. Confirm the complete model number and full-scale flow configuration.
2. Verify that the selected gas is non-corrosive and material-compatible.
3. Check the inlet pressure and operating differential pressure.
4. Inspect the 3/8-inch Swagelok connection and tubing compatibility.
5. Confirm the required 142 mm fitting distance.
6. Connect the specified positive and negative DC supplies.
7. Wire the analog setpoint and output signals correctly.
8. Perform the approved gas-line leak test.
9. Apply the setpoint and verify the measured flow response.
10. Confirm stable operation before releasing the equipment for production.

Use appropriate high-purity gas handling procedures where required. Follow the equipment manufacturer's instructions for connection, purging, and leak testing.

10 | Maintenance and Troubleshooting Insights

Routine maintenance should prioritize gas compatibility, pressure stability, electrical signal quality, and valve operation.

• Flow instability: Check inlet pressure, differential pressure, and gas supply stability.
• Unexpected zero flow: Verify the setpoint, electrical supply, and normally closed valve state.
• Incorrect flow indication: Inspect analog output wiring and controller scaling.
• Slow response: Review pressure conditions and process-line restrictions.
• External leakage: Inspect Swagelok connections and compatible sealing components.
• Temperature-related deviation: Check whether the installation remains within 15–35°C.

Investigate gas contamination and valve condition before adjusting process settings. Avoid unauthorized internal modifications.

11 | Standards and Compliance

• Industry Standards: SEMI standards.
• Product Configuration: Standard unheated version.

Specific SEMI standard numbers and individual certification references were not included in the supplied specifications. Confirm the applicable compliance documentation before equipment qualification.

12 | Engineering FAQ

Q1: Why is a normally closed valve useful in gas delivery equipment?

The valve closes when electrical power is removed. This provides a defined power-off valve state. Engineers should still evaluate the complete gas system's safety design and required isolation devices.

Q2: How should engineers interpret the 1 MPa pressure resistance rating?

Pressure resistance describes a specified withstand condition, not the normal operating limit. The maximum inlet pressure remains 300 kPa(G). Always distinguish operating pressure from pressure resistance during equipment selection.

Q3: Can this model replace a higher-accuracy mass flow controller directly?

Not without reviewing the process requirements. Its accuracy is ±1% FS, and repeatability is ±0.5% FS. Compare these limits with the original instrument's specifications and the process tolerance before replacement.

Q4: What causes different flow readings between two controllers with the same nominal capacity?

Gas calibration, pressure conditions, installation geometry, and signal scaling can produce different readings. Confirm the actual gas and full-scale configuration. Also check whether both instruments use the same reference conditions.

Q5: What should procurement teams verify when sourcing this model for an existing gas panel?

Check the full model designation, 50–100 SLM capacity, 3/8-inch Swagelok connection, fitting distance, and electrical interface. Confirm the normally closed valve configuration and seal materials. These details help avoid mechanical and control-system mismatches.

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