MKS 1159B-00050RV-S Flow Controller He 50CCM

( Brand: Mks ), ( Manufacturer Part Number: 1159B-00050RV-S ), ( Part Type: Flow Controller ), ( Maximum Flow Rate: 50ccm ), ( Gas Media: He Helium )

Review MKS Mass Flow Controller He

The **MKS 1159B-00050RV-S** is a high-performance, mass flow controller designed for precise and reliable gas flow regulation in demanding laboratory, industrial, and research applications. Part of MKS Instruments renowned **1159 Series**, this digital mass flow controller combines advanced thermal mass flow sensing technology with intelligent control algorithms to deliver exceptional accuracy, repeatability, and stability across a wide range of gases and operating conditions. Engineered for applications requiring sub-ppm level precision, the 1159B-00050RV-S features a **50 sccm (standard cubic centimeters per minute) nominal flow range**, making it ideal for low-flow processes such as semiconductor manufacturing, thin-film deposition, chemical vapor deposition (CVD), plasma etching, or analytical instrumentation where minute gas quantities must be metered with absolute consistency. Its **RV (reverse flow) capability** allows for bidirectional flow control, enabling applications where gas can be introduced or exhausted in alternating directions, such as in some CVD or plasma systems, without compromising performance.

At the heart of this controller is MKS s proprietary **thermal mass flow sensor**, which measures gas flow by detecting the temperature difference between a heated filament and the surrounding gas stream. This method ensures that flow readings are independent of gas pressure, temperature, or composition critical for maintaining accuracy in varying environmental conditions. The controller s **digital interface** supports both **RS-232 and USB communication protocols**, enabling seamless integration with PLCs, data acquisition systems, or laboratory software for automated process control and monitoring. Its **user-friendly front panel** features a backlit LCD display with intuitive navigation, allowing operators to easily set flow rates, calibrate the system, and diagnose potential issues with minimal training. The robust **aluminum housing** and **stainless steel flow tube** construction ensure durability in harsh environments, while the **wide operating temperature range** (from -20 C to 60 C) accommodates a broad spectrum of applications, including those in temperature-controlled chambers or vacuum systems.

For enhanced reliability, the 1159B-00050RV-S incorporates **MKS s patented flow sensor technology**, which minimizes drift and maximizes long-term stability, reducing the need for frequent recalibration. The controller also includes **built-in diagnostics**, such as sensor health monitoring and fault detection, to alert operators to potential issues before they impact process integrity. Compatible with a variety of gases including inert, reactive, and corrosive substances the unit is equipped with **standard 1/4-inch or 1/8-inch stainless steel fittings** (depending on configuration) to accommodate different tubing sizes, ensuring compatibility with existing gas delivery systems. Whether deployed in a high-precision research lab, a semiconductor fabrication facility, or an industrial gas processing application, this mass flow controller delivers unmatched performance, versatility, and ease of use, making it a cornerstone of modern gas flow management solutions.

**Pros and Cons of buying a MKS 1159B-00050RV-S Flow Controller (50 ccm HE)**

### **Pros**

1. **High Precision and Accuracy** The MKS 1159B series is known for its high-precision mass flow control, making it suitable for applications requiring tight process control, such as semiconductor manufacturing, research labs, or industrial gas delivery systems.

2. **Wide Flow Range** With a specified range of **0.5 to 50 ccm (standard conditions)**, it can handle a broad range of gas flow requirements, offering flexibility for different applications.

3. **High Efficiency (HE) Model** The "HE" designation indicates a high-efficiency design, which typically means better performance in terms of response time, stability, and reduced power consumption compared to standard models.

4. **Digital Control and Communication** The unit supports **RS-232 or RS-485 communication**, allowing for easy integration with PLCs, data loggers, or computer-based control systems. This makes it ideal for automated processes.

5. **Low Leakage and High Reliability** MKS instruments are generally built with durable materials and tight seals, reducing the risk of gas leaks and ensuring long-term reliability in critical applications.

6. **Compatibility with Multiple Gases** The controller is designed to work with a variety of gases (inert, reactive, or corrosive, depending on the sensor and materials used), making it versatile for different experimental or industrial setups.

7. **Calibration and Adjustability** The device can be calibrated for specific gases and flow conditions, allowing users to fine-tune performance for optimal results.

8. **Compact and Modular Design** The unit is relatively compact, making it suitable for integration into existing systems without requiring excessive space.

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### **Cons**

1. **High Initial Cost** MKS instruments are premium-grade, and the 1159B series is no exception. The price may be significantly higher than that of basic analog or lower-end digital flow controllers.

2. **Complex Setup and Calibration** Unlike simpler flow meters, this device requires proper installation, calibration, and sometimes software configuration. Users without experience in mass flow control may need additional training or support.

3. **Maintenance and Spare Parts** Due to its precision components (e.g., thermal mass flow sensors), maintenance may require specialized knowledge. Replacement parts or servicing could be costly if not handled by authorized technicians.

4. **Power Dependency** The controller requires a stable power supply. Fluctuations or power outages could disrupt operation, especially in critical applications.

5. **Limited Flow Range for Some Applications** While the 50 ccm range is useful for many lab and small-scale industrial applications, it may be insufficient for high-throughput processes requiring larger flow rates.

6. **Potential for Sensor Drift** Over time, thermal mass flow sensors can experience drift, requiring periodic recalibration to maintain accuracy. This adds to long-term operational costs.

7. **Compatibility with Gas Purity** Some gases (e.g., highly corrosive or reactive ones) may require additional filtration or specialized sensors, which could increase system complexity and cost.

8. **Learning Curve for Advanced Features** Features like PID control, multi-gas mixing, or remote monitoring may require familiarity with control systems, which could be a barrier for users without technical expertise.

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### **Conclusion**

The **MKS 1159B-00050RV-S (50 ccm HE)** is a **high-performance mass flow controller** ideal for applications demanding **precision, reliability, and integration with automated systems**. It excels in **research labs, semiconductor manufacturing, and industrial processes** where accurate gas flow control is critical. However, its **high cost, complexity, and maintenance requirements** make it less suitable for **budget-conscious or simple applications**.

If you need **ultra-precise, repeatable, and digitally controllable gas flow** in a **controlled environment**, this controller is an excellent investment. For **basic or low-budget setups**, a simpler analog or lower-end digital flow controller may suffice.

### **Recommendation**

- You require **high-precision gas flow control** for critical applications (e.g., lab research, semiconductor processing, or automated industrial systems).

- You can afford the **higher upfront cost** and are willing to invest in proper training or support.

- Your system **requires digital communication (RS-232/RS-485)** for integration with PLCs or data logging.

- You are working with **low-budget or non-critical applications** where basic flow meters would suffice.

- You lack **technical expertise** to set up, calibrate, or maintain the device.

- Your flow requirements **exceed 50 ccm** or are **highly variable**, as a larger or adjustable-range controller may be needed.

For most **serious scientific or industrial users**, the **MKS 1159B-00050RV-S** is a **strong choice** due to its reliability and performance. However, always verify compatibility with your specific gases and system requirements before purchasing.

Details:

This unit was removed from service in good working and physical condition with minor wear previous use. If a lift gate is needed for delivery, please let us know upon quote request.

part #: 1159b00050rv price

• $149.95

specifications pneumativalv:

• brand: Mks
• mpn: 1159b-00050rv-s
• part type: Flow Controller
• maximum flow rate: 50ccm
• gas media: He Helium

seller pneumativalv:

• # reviews: 4245
• city: San Tan Valley, Arizona
• rating: 100.0%

payments pneumativalv:

• other
• wallet: Paypal
• credit card: Diners-club

shipping pneumativalv:

• class: Standard
• transit: 4-11 Days
• cost: $17.41
• type: Calculated
• carrier: UPS
• service: UPS Ground

returns pneumativalv:

• method: Money back
• paid by: Buyer
• time: 30 Days
• policy: Returns Accepted

offer pneumativalv:

• sold: 0
• options: Ship-to-home
• best offers: True
• quantity: 1
• availability: In Stock
• started: May 19, 2026

general pneumativalv:

• condition: Used
• Pump Flow Controllers > Flow Controllers Meters > Mass Flow Controllers

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