• McMillan OSMIUM Series Thermal Flow Switches for Liquid Applications

McMillan Flow Products introduces the OSMIUM Series, a highly robust thermal flow switch with a precision engineered flow body to create a reliable, cost-effective flow monitoring solution that requires minimal set-up and is easy to install. Designed to achieve optimal flow conditions in a compact package, the OSMIUM thermal flow switch has options available to cover a wide range of flow rates and can be paired with an assortment of different process connections, providing flexibility for a variety of applications. The OSMIUM thermal flow switch provides a simple and efficient solution for customers in need of reliable and cost-effective flow monitoring for their non-viscous water-based liquids.


Key Features:

  • FLOW BODY DESIGN AND FLOW RANGES:  Flow bodies are designed to achieve optimal flow conditions in a compact package and are available aluminum or stainless-steel construction. Flow ranges as low as 150 – 1000 mL/min to as high as 1.2 – 50.0 L/min are supported.
  • FLUID CONNECTIONS: Process connections are available in a wide variety of sizes and material construction. Range 1L | 10L | 20L units units come stock with 3/8” FNPT ports, and Range 50L units come stock with 3/4” FNPT ports. 
  • MICROPROCESSOR-BASED TEMPERATURE COMPENSATION:  The system achieves superior temperature compensation during the measuring cycle using a microcontroller. This ensures accurate correction of flow measurement even when liquid temperature changes occur.
  • SWITCH OUTPUT FUNCTION:  This device utilizes a PNP open collector that is either normally open or normally closed. The normally open option enables a high-resistance state when flow is below the setpoint. The normally closed enables a high-resistance state when flow is above a setpoint.
  • ELECTRICAL CONNECTION: Units come standard with a 4-Pin Micro DC connection. Optional mating cables with various lengths are available.
  • CALIBRATION SERVICES: Our expert technicians can set up the device based on individual application parameters, including adjusting the flow range and setting the switch point to a desired rate. This service helps minimize installation and setup time, allowing for a more streamlined and efficient workflow. For optional custom calibration services, please contact the factory or an authorized representative for more information.
  • MOUNTING KIT: Optional steel mounting hardware is available. The mounting kit includes a fixed set screw that aligns with a socket feature on the device to insure optimum positioning.
  • DISPLAY:  An array of 8 LEDs is used to visually monitor general flow rate. A blinking setpoint LED function can be adjusted along the array to indicate when the device should switch.
  • Max. Pressure:
    • Plastic fitting: 13 bar
    • Steel fitting: 34 bar
  • Electrical protection: IP65 / NEMA 4X
  • WETTED MATERIALS: Aluminum & SS 316 
  • Electronics housing: SS304 
  • Medium: Water-Based Liquids (Not Suitable for Oils or Fuels)


Typical Applications

  • Cooling systems monitoring
  • Precision chemical dosing
  • Semiconductor processing control
  • Pharmaceutical manufacturing control
  • Brewing and distilling



Optional Fitting CodeFlow RangePrice
9860-3-T6 PFA 3/8” tube fittings with 3/8” MNPT threads (pair)
1L, 10L$300
9860-3-T7 PFA 1/2” tube fittings with 3/8” MNPT threads (pair) 
1L, 10L, 20L$320
9863-3-T6 316L 3/8” tube fittings with 3/8” MNPT threads (pair) 
10L, 20L
$155
9863-3-T8 316L 5/8” tube fittings with 3/8” MNPT threads (pair) 
10L, 20L
$255
9863-6-T8 316L 5/8” tube fittings with 3/4” MNPT threads (pair)
50L$255
9863-6-T9 316L 3/4” tube fittings with 3/4” MNPT threads (pair)
50L
$265
9863-6-T10 316L 1” tube fittings with 3/4” MNPT threads (pair)
50L$275
9864-3-T6 Acetal 3/8” tube fittings with 3/8” MNPT threads (pair)
1L, 10L$ 20


Thumb File information
OSMIUMDS-87X 2401 Datasheet.pdf 2.02MB
McMillan SERIES
Accuracy N/A
Precision ± 2% Full Scale
Pressure Rating Overpressure Limit: 100 psig (6.8 bar)
Temperature Rating (Fluid) -4 to 176 °F [ -20 to 80 °C ]
Temperature Rating (Environment) -4 to 140 °F [ -20 to 60 °C ]
Wetted Materials Aluminum & 316L Stainless Steel
Compatible Liquids Water-Based Liquids Water Content ≥ 90%
Integrated Display 8-position LED Array Display
Power Requirement Max 3.6 W; 24 VDC ± 10%
Electrical Connections Micro DC plug, 4-pin Male
Typical Response Time Typically <1 second for 63% of final value

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McMillan OSMIUM Series Thermal Flow Switches for Liquid Applications

  • Brand: MCM Flow
  • Product Code: McMillan-87X
  • Availability: In Stock
  • $580.00


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Tags: Flow Control, Automation, Valve, Fluid Handling, Flow Meter