Marsh Instruments

For over 140 years, the Marsh Instruments division of the Marsh Bellofram Group of Companies has manufactured the highest quality pressure gauges and thermometers for a variety of commercial and industrial applications.

Mountain Controls offers the following from Marsh Instruments:

Gauges

Economy/Value Gauges

Marsh Instruments offers the Marshalltown Value Series as its most economical, general purpose gauge line. These gauges are designed for use with non-corrosive media including air, gas, and oil. Typically, these gauges are used with boilers, compressors, dryers, FRLs, pumps, and other commercial and industrial applications.

Key Details

  • Case sizes: 1-1/2" and 2"
  • Materials: steel with copper alloy internals
  • Pressure range: Up to 5,000 PSI

For more information about these gauges, see the Marshalltown Value Series Gauge Datasheet launch and contact us to start your order.

Marshalltown Value Series Gauges

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General Service Gauges

Marsh Instruments general service gauges are general purpose, economical gauges for use with non-corrosive media, including air, gas, oil, and water. They are typically used in boiler, compressor, dryer, pump, and various other commercial and industrial applications.

Key Details

  • Dial sizes: 1-1/2", 2", 2-1/2", 3-1/2" and 4-1/2"
  • Materials: Steel casing with copper alloy internals
  • Pressure range: 0-30" Hg VAC; Compound 30" Hg VAC to 400 PSI; 15 to 5,000 PSI

For more information about these gauges, see the the General Service Steel Case Gauges Datasheet launch and contact us to start your order.

Marsh General Service Gauges

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Severe Service Gauges

Marsh Instruments severe service gauges are designed to measure pressure in extreme industrial and OEM environmental conditions where pulsation and vibration pose a challenge. Typically, these gauges are used in chemical, marine, OEM, and oil and gas applications.

Mountain Controls offers the following Marsh Instruments severe service gauges. For more information about each of the gauges, see the corresponding Datasheets linked in the tables below. Check out our online stock to order directly or contact us to start your order.

Marsh Severe Service Gauges

Gauge Description Pressure Ranges More Information
40MM & 50MM Severe Service Gauges Glycerine-filled gauges featuring an acrylic window, stainless steel casing, and copper alloy internals. 15-160 psi Marsh Instruments 40MM and 50MM Severe Service Gauge Datasheet launch
63mm Severe Service Gauges Gauges featuring a polycarbonate window, stainless steel casing, and either copper alloy or stainless steel internals. Standard gauges are filled with glycerine, but can also be ordered dry (no liquid) or with silicone. 0-30" Hg VAC; Compound 30" HG VAC to 300 psi; 15 to 10,000 psi Marsh Instruments 63mm Severe Service Gauge Datasheet launch
100mm Severe Service Gauges Gauges featuring a polycarbonate window, stainless steel casing, and either copper alloy or stainless steel internals. Standard gauges are filled with glycerine, but can also be ordered dry (no liquid) or with silicone. 0-30" Hg VAC; Compound 30" Hg VAC to 300 psi; 15 to 10,000 psi Marsh Instruments 100mm Severe Service Gauge Datasheet launch
63mm & 100mm Brass Severe Service Gauges Gauges featuring an acrylic window, forged brass casing, and copper alloy internals. Standard gauges are filled with glycerine, but can also be ordered dry (no liquid) or with silicone. 0-30" Hg VAC; Compound 30" Hg VAC to 200 psi; 15-10,000 psi Marsh Instruments 63mm and 100mm Forged Brass Severe Service Gauge Datasheet launch

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Low Pressure Gauges

Marsh Instruments low pressure diaphragm gauges provide low pressure readings in a variety of applications including HVAC systems and low pressure gas burner systems.

Key Details

  • Dial sizes: 2-1/2", 3-1/2", and 4-1/2"
  • Materials: Steel casing with copper alloy internals and a bronze diaphragm element
  • Pressure range: capable of ASME Grade A-1% accuracy for ranges above 30” of water; available in vacuum and pressure in inches of water, ounces per square inch, and millimeters of mercury—see the Datasheet for more information

For more information about these gauges, see the Low Pressure Diaphragm Gauge Datasheet launch and contact us to start your order.

Marsh Low Pressure Diaphragm Gauges

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Precision Service Quality Gauges

Marsh Instruments precision service quality gauges provide great accuracy and continuity at an economical price. They are typically used in applications involving air compressors, reciprocating pumps, boilers, hydraulic presses, and many other industrial and OEM applications.

Key Details

  • Dial sizes: 3-1/2" and 4-1/2"
  • Materials: Steel casing with copper alloy pressure element (up to 1,000 PSI) or stainless steel (above 1,000 PSI)
  • Pressure range: 0-30" Hg VAC; Compound 30" Hg VAC to 300 PSI; 15 to 20,000 PSI

For more information, see Precision 100mm Gauges Datasheet launch and Precision Service Quality Gauges Datasheet launch, and contact us to start your order.

Marsh Precision Service Gauges

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Process Gauges

Marsh Instruments offers a comprehensive line of process gauges featuring safecase design, dry or liquid fill medium, and a variety of options to fit a variety of needs. These gauges are typically used in chemical and petroleum chemical processes, compressors, power plants, and oil platforms.

Key Details

  • Dial sizes: 4-1/2" and 6"
  • Materials: polypropylene or aluminum casing with copper alloy or stainless steel internals
  • Fill medium: dry or filled (glycerine or silicone)
  • Pressure range: 0-30" Hg VAC; Compound 30" Hg VAC to 300 PSI; 15-20,000 PSI

For more information about these gauges, see the Process Gauge Datasheet launch and contact us to start your order.

Marsh Process Gauges

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Thermometers and Tridicators

Marsh Instruments has a wide variety of reliable, cost-effective temperature instruments that are suitable for monitoring temperature fluctuations in industrial-grade applications including chemical processing, HVAC, OEM, offshore, oil and gas, power generation, and process control.

Bimetal Thermometers

Marsh Instruments bimetal thermometers provide reliable, cost-effective locally mounted temperature indication in 9 dual scale ranges (Celsius and Fahrenheit). These thermometers are typically used in chemical, HVAC, offshore, power, process, and OEM applications.

Key Details

  • Dial sizes: 2", 3", 5"
  • Materials: stainless steel with hermetically sealed glass window and optional external adjustment screw (on 3" and 5")
  • Temperature range: -50° to 1,000° F (-40° to 525° C)

For more information about these thermometers, see the Bimetal Thermometers Datasheet launch and contact us to start your order.

Marsh Bimetal Thermometer

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Industrial Thermometers

Marsh Instruments offers adjustable-angle, industrial thermometers designed for use in demanding commercial and industrial applications with limited space, such as condensers, diesel engines, pipelines, pumps, reduction gears, and steam turbines.

Key Details

  • Dual scale (F° and C°) thermometer measuring 9" length
  • Materials: glass-reinforced nylon case; glass window; white-coated aluminum scale; 3-1/2" or 6" adjustable aluminum stem
  • Temperature range: -40° to 300° F (-40° to 150° C)

For more information about these thermometers, see the Industrial Thermometers Datasheet launch and contact us to start your order.

Marsh Industrial Thermometer

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Submarine Thermometers

Marsh Instruments offers high-accuracy submarine thermometers designed for space constrained applications such as diesel engines, steam turbines, reduction gears, pumps, condensers, boilers, chillers, and pipelines.

Key Details

  • 1% accuracy of span and temperature monitoring capabilities
  • Dual scale (F° and C°) thermometer measuring 5" length
  • Materials: ABS case; glass window; white-coated aluminum scale
  • Temperature range: -40° to 400°F (-40° to 200°C)

For more information about these thermometers, see the Submarine Thermometers Datasheet launch and contact us to start your order.

Marsh Submarine Thermometer

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Tridicators (Boiler Gauges)

Marsh Instruments offers tridicators (also known as boiler gauges) for use with hot water heating applications such as hot water boilers, heated pools, and hot tubs. They indicate temperature in Fahrenheit and Celsius, and pressure in psi and altitude in feet of water.

Key Details

  • Available in 2-1/2" round steel case or 3-1/2" square steel case
  • Temperature range: 60° to 260° F (20° to 120° C)
  • Pressure range: dual scale available in four range options with maxiumum up to 300 psi and 680 ft. of water

For more information about these thermometers, see the Tridicators Datasheet launch and contact us to start your order.

Marsh Tridicator

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Thermowells

Marsh Instruments has a variety of thermowells to protect temperature sensors from temperature extremes and to enable removal of an instrument from the process without requiring shut down. They offer a variety of threaded thermowells in brass, 304 stainless steel, or 316 stainless steel and are available in tapered or straight shanks. For more information, see the Thermowells Datasheet launch and contact us to start your order.

Marsh Thermowells

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Handheld Digital Pressure Indicator and Calibrator

Marsh Instruments offers a lightweight, portable, battery-operated, high accuracy digital pressure indicator to convert pressure input to an LCD digital readout. It is ideal for calibrating DP cells, I/Ps and P/Is. For more information, see the Marsh Instruments Handheld Digital Pressure Indicator and Calibrator Datasheet launch and contact us to start your order.

Bellofram Digital Pressure Indicator

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Needle Valves

The Marsh Bellofram Group of Companies offers BelGAS needle valves for use in instrumentation, process plants, oil and gas production, and other general applications that require isolation and positive shutoff.

Mountain Controls offers the following BelGAS needle valves. For more information about each of the valves, see the BelGAS Needle Valves Datasheet launch and contact us to start your order.

Valve Description Pressure rating
BelGAS Metal-to-Metal Seat Needle Valve 316 stainless steel valve suitable for applications involving caustic and corrosive materials. 10,000 PSI (70,000 kPa)
BelGAS Soft-Seat Needle Valve 316 stainless steel valve suitable for applications requiring bubble-tight shutoff of liquids or gases 6,000 PSI (42,000 kPa)
BelGAS Block/Bleed Needle Valves 316 stainless steel valve suitable for isolating gauge legs and readings, allowing sampling without loss of material, and providing extra pressure ports with isolation capabilities. 10,000 PSI (70,000 kPa)
BelGAS Miniature Needle Valve 316 stainless steel valve offered in a miniature size for test stand and general applications with space limitations. 6,000 PSI (42,000 kPa)

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