SEC-Z512KX HORIBA STEC SEC-Z500X Mass Flow Controller

SEC-Z512KX | HORIBA STEC SEC-Z500X Ultra-Low-Flow Mass Flow Controller

The HORIBA STEC SEC-Z512KX is an ultra-low-flow mass flow controller from the SEC-Z500X Digital/Analog Series. It is designed for semiconductor process applications that require precise control of very small gas flows, with fixed full-scale ranges of 1 SCCM or 2 SCCM on an N2-equivalent basis.

This configuration combines a piezoelectric control valve, analog setpoint and output signals, and RS-485 F-Net communication. Its compact body and 106 mm fitting distance support integration into gas delivery assemblies where installation space and low-flow stability are important.

01 | Low-Flow Control Performance

At full scale, the SEC-Z512KX provides a specified accuracy of ±1.0% FS and repeatability of ±0.2% FS. Its control range extends from 2% to 100% FS, allowing operation across a broad portion of the selected measurement range.

Engineering note: The 1 SCCM and 2 SCCM options are fixed full-scale configurations, not user-selectable operating ranges. Confirm the required range and calibrated gas before ordering.

02 | Gas Compatibility and Pressure Conditions

The controller is calibrated for one specified gas and one fixed flow range. Gas selection is therefore part of the ordering configuration. The N2-equivalent flow reference should not be interpreted as universal calibration for every process gas.

For semiconductor gas delivery systems, verify the gas identity, pressure differential, seal material, and upstream supply conditions together. These factors affect whether the controller matches the intended process installation.

03 | Analog and Digital Integration

The SEC-Z512KX supports both analog signal control and digital communication. Engineers can select the appropriate interface based on the gas panel architecture and control-system requirements.

• Analog setpoint: 0.1–5 VDC
• Analog output: 0–5 VDC
• Digital interface: RS-485 F-Net protocol
• Communication speed: 38,400 bps
• Connectors: D-Sub 9-pin and RJ-45

Before commissioning, check the host controller's signal configuration, communication settings, connector pin assignment, and grounding arrangement. Do not assume that an RS-485 physical connection guarantees compatibility with a different communication protocol.

04 | Mechanical Design and Installation Envelope

The compact housing measures 126 × 64 × 29 mm (H × W × T). The specified connection is a 1/4-inch VCR male fitting with a 106 mm fitting distance.

Check the available panel space and fitting center distance before replacing an installed controller. Also verify that the mating VCR connections and sealing arrangement match the existing gas line.

05 | Electrical Supply Requirements

The controller requires bipolar DC power. Confirm that both supply rails remain within specification under operating load.

During startup checks, verify supply polarity and voltage stability before applying the flow setpoint. Incorrect power wiring or insufficient supply capacity can prevent normal operation and complicate fault diagnosis.

06 | Semiconductor Process Applications

The SEC-Z512KX is intended for applications where gas flow requirements fall within its ultra-low fixed ranges. Typical process areas include:

• Doping processes: Controlled delivery of process gases in low-flow applications.
• Ion implantation: Gas supply control for equipment requiring a very small calibrated flow.
• Thin-film deposition: Low-flow gas management in semiconductor process equipment.
• Gas distribution panels: Compact integration into precision gas delivery assemblies.

07 | Selection and Commissioning Checks

Use the following checks when specifying or replacing this controller:

1. Confirm the full-scale range: Select the 1 SCCM or 2 SCCM version according to the process requirement.
2. Confirm gas calibration: Match the calibrated gas to the actual process gas specified for the application.
3. Check pressure conditions: Keep the operating differential pressure within the specified 50–300 kPa(d) range.
4. Verify the interface: Confirm analog signal levels or RS-485 F-Net communication requirements.
5. Check mechanical fit: Verify the 1/4-inch VCR male connection and 106 mm fitting distance.
6. Confirm seal selection: Match metal or elastomer seals to the gas system's material requirements.

These checks help reduce replacement errors caused by differences in gas calibration, range, connection dimensions, and control-system interfaces.

8 | Product Identification and Ordering Data

Frequently Asked Questions

Q1: Can the SEC-Z512KX be recalibrated for a different process gas after installation?

The supplied configuration is specified for single-gas, single-range calibration. Do not assume that changing the gas setting in the host system will provide an equivalent calibrated flow. Confirm the manufacturer's supported recalibration options before planning a gas conversion.

Q2: What should be checked if the measured flow does not reach the commanded setpoint?

Check the actual inlet and outlet pressure conditions first. Then verify the selected full-scale range, gas calibration, analog setpoint level, and supply voltage. A pressure differential outside the specified operating window can limit the controller's ability to achieve the requested flow.

Q3: How should engineers evaluate flow instability at very low setpoints?

Check whether the requested flow is within the 2–100% FS control range. Inspect upstream pressure stability and gas supply conditions, then review signal noise and grounding. At ultra-low flow rates, small disturbances in the gas supply or electrical signal can become significant relative to the setpoint.

Q4: What precautions are recommended when replacing this unit in an existing gas panel?

Compare the calibrated gas, fixed range, VCR fitting orientation, fitting distance, seal material, and electrical interface with the installed unit. Confirm the normally open or normally closed valve configuration where relevant to the equipment design. A matching model designation alone should not replace a full configuration check.

Q5: When should the unheated version be reconsidered for a process installation?

Evaluate the process gas, ambient temperature, installation environment, and required thermal stability. This model is specified as the standard unheated version, with an operating temperature of 5–50°C. If the process requires temperature control of the controller body or gas path, confirm the appropriate heated configuration with the manufacturer.

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