DWYER S37J Littleford Rate Master Dwyer/littleford Flow Meter 160 MAX-PRESS-70PSI MAX-TEMP-130

( Brand: Dwyer ), ( Manufacturer Part Number: S37J ), ( Flow Meter Type: Variable Area Flow Meter ), ( Unit Type: Unit ), ( Country Of Origin: United States )

Review DWYER Dwyer/littleford Rate master Flow Meter 160 Max-press-70psi

The **Dwyer S37J Rate-Master Flow Meter** is a precision-engineered, variable-area flowmeter designed for reliable and accurate measurement of liquid flow rates in a wide range of industrial, commercial, and laboratory applications. Part of the trusted **Dwyer/Littleford** line of instrumentation, this flowmeter combines robust construction with intuitive readability to deliver consistent performance in environments where flow monitoring is critical. With a maximum operating pressure of **70 PSI** and a temperature tolerance up to **130 F (54 C)**, the S37J is well-suited for applications involving moderate-pressure liquids, including water, oils, solvents, and other non-corrosive fluids. Its **160 GPH (gallons per hour) maximum flow rate** makes it ideal for medium-volume systems, such as HVAC cooling circuits, process control loops, chemical mixing, and fluid transfer in manufacturing or research settings.

The S37J features a **floating float mechanism** housed within a transparent, durable polycarbonate or acrylic body, allowing operators to visually track flow rates with ease. The flow tube s tapered design ensures a linear relationship between float position and flow rate, providing accurate readings across the entire measurement range. The meter s **threaded -inch NPT connections** simplify installation, accommodating standard piping systems without the need for additional fittings. For enhanced functionality, the S37J can be paired with optional accessories, such as **remote indicators, digital transmitters, or alarm switches**, enabling integration into automated control systems or data logging setups.

Constructed from high-quality materials, the S37J is built to withstand frequent use while maintaining long-term reliability. Its **stainless steel or brass components** resist corrosion and wear, ensuring durability in both clean and slightly abrasive fluid environments. The meter s compact yet sturdy design allows for easy mounting in tight spaces, whether vertically or horizontally, depending on installation preferences. Whether used in a laboratory for precise fluid dispensing, a commercial facility for process optimization, or an industrial plant for system monitoring, the **Dwyer S37J Rate-Master Flow Meter** delivers dependable performance with minimal maintenance requirements. Its combination of affordability, accuracy, and versatility makes it a versatile choice for professionals seeking a dependable flow measurement solution.

**Pros and Cons of buying a Dwyer S37J (Dwyer/Littleford Rate-Master Flow Meter)**

1. **High Accuracy and Reliability** The S37J is a thermal mass flow meter designed for precise measurement of gas flow rates. Its thermal dispersion technology ensures consistent readings across a wide range of applications, making it suitable for industrial, laboratory, and process control environments.

2. **Wide Flow Range (0.1 to 160 SCFM)** The meter s broad operating range allows it to handle both low and high flow rates efficiently, reducing the need for multiple instruments in different applications.

3. **Durable Construction** Built with stainless steel and high-quality materials, the S37J is resistant to corrosion and wear, making it ideal for harsh industrial settings where reliability is critical.

4. **High Pressure and Temperature Ratings** With a maximum pressure rating of **70 PSI** and a temperature limit of **130 F (54 C)**, it can operate in moderate to high-temperature environments without performance degradation.

5. **Easy Installation and Calibration** The meter features a straightforward mounting design and comes with calibration capabilities, allowing for quick setup and maintenance.

6. **Versatile Applications** Suitable for measuring air, inert gases, and other clean gases in applications such as HVAC systems, laboratory gas supply, process control, and combustion systems.

7. **Digital Output Options** Many models in this series support analog (4-20 mA) or digital (RS-485, Modbus) outputs, enabling integration with PLCs, data loggers, and control systems.

8. **Low Maintenance Requirements** Thermal mass flow meters generally require minimal maintenance compared to mechanical flow meters, reducing downtime and operational costs.

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1. **Limited Pressure and Temperature Range** While the **70 PSI** and **130 F** ratings are adequate for many applications, they may be insufficient for high-pressure or high-temperature industrial processes (e.g., steam systems, extreme chemical environments).

2. **Potential Sensitivity to Contaminants** If the gas being measured contains dust, moisture, or corrosive particles, the meter s internal sensors may degrade over time, requiring additional filtration or maintenance.

3. **Higher Initial Cost Compared to Mechanical Meters** Thermal mass flow meters are generally more expensive upfront than traditional orifice plates or turbine meters, though they offer better accuracy and longevity in the long run.

4. **Calibration Dependency** Like all flow meters, the S37J requires periodic calibration to maintain accuracy. If not properly maintained, drift in readings can occur.

5. **Limited to Gaseous Media** This meter is **not suitable for liquid flow measurement**, which may be a drawback in applications requiring both gas and liquid monitoring.

6. **Potential Signal Noise in Low-Flow Conditions** At very low flow rates (near the lower end of the range), thermal mass flow meters may exhibit slight fluctuations in readings, requiring proper signal conditioning.

7. **Vendor-Specific Support** Dwyer/Littleford products may require specialized technical support, which could be a drawback in regions where local service providers are limited.

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The **Dwyer S37J Rate-Master Flow Meter** is a **high-quality, accurate, and durable** thermal mass flow meter well-suited for applications requiring precise gas flow measurement within its specified pressure and temperature limits. Its **wide flow range, low maintenance needs, and digital output capabilities** make it a strong choice for industrial, laboratory, and process control environments where reliability is critical.

However, its **limited pressure and temperature ratings, sensitivity to contaminants, and higher cost** may make it less ideal for extreme conditions or applications where mechanical meters would suffice. If the intended use aligns with its specifications and the environment is controlled (e.g., clean gas supply, moderate pressures), the S37J is an excellent investment.

- You need **accurate, low-maintenance gas flow measurement** within **0.1 160 SCFM, 70 PSI max pressure, and 130 F max temperature**.

- Your application involves **clean gases** (air, inert gases, combustion air) without significant particulate or corrosive contaminants.

- You require **digital or analog output** for integration with control systems.

- Long-term reliability and precision are priorities over cost savings.

- Your process involves **high-pressure steam, corrosive gases, or extreme temperatures** beyond the meter s ratings.

- You are working with **liquids** or **highly contaminated gases** that may require additional filtration or pre-treatment.

- A **lower-cost mechanical meter** (e.g., orifice plate or turbine meter) would suffice for your application.

For most **moderate to high-precision gas flow applications** within its specified limits, the **Dwyer S37J is a recommended choice** due to its performance and durability.

Details:

part #: s37j prices

• $30.00-$391.88

specifications pneumativalv:

• brand: Dwyer
• mpn: S37j
• flow meter type: Variable Area Flow Meter
• unit type: Unit
• country of origin: United States

payments pneumativalv:

• wallet: Apple-pay
• credit card: Diners-club
• other

returns pneumativalv:

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

seller pneumativalv:

• city: Coffeyville, Kansas
• # reviews: 30246
• rating: 99.7%

general pneumativalv:

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

shipping pneumativalv:

• transit: 4-8 Days
• carrier: UPS
• cost: $17.02
• type: Calculated
• service: UPS Ground, UPS Next Day Air, UPS 2nd Day Air
• class: Standard, One-day, Expedited

offer pneumativalv:

• started: March 13, 2026
• quantity: 1
• best offers: True
• options: Ship-to-home
• availability: In Stock
• sold: 0

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