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K25250 Capillary Thermometer
Item: K25250

Marshall K25250 Capillary Thermometer.  Remote Vapor Thermometer
  Products > Capillary Thermometers
K25250 Capillary Thermometer
Item: K25250

Remote Vapor Thermometer

  • 2.5" Dial w/ Front Flange Mount
  • 0-250F/C Dual Scale
  • 6 ft braided copper capillary
  • 2.5" long bulb with 1/2" NPT union fitting
Contact us for more information. We can supply custom capillary thermometers as needed.


ACCURACY: +/- 3% from 20-50% of scale and +/- 2% over remaining 50% of scale.

CASE SIZES: 2, 2½, 3½, 4½ inches diameter.

CASE MATERIAL: Steel with black enamel paint.


  • U = Front Flange (U-Clamp), flush mount with center back remote connection. (2", 2½", 3½") = Marshalltown X-8.
  • FF = 3 Hole Front Flange, flush mount, with center back remote connection. (2", 2½", 3½") = Marshalltown X-5.
  • G = Back Flange, surface mount, with adjustable lower back & bottom remote connection. (3½", 4½") = Marshalltown X-6, X-7.
  • P = Plain case (3½" only) with adjustable angle, bottom direct mount (without capillary) = Marshalltown X-3.

TUBE: Drawn copper alloy.

MOVEMENT: Brass sector with polycarbonate side plates.

CAPILLARY: 6 feet of flexible capillary with double-braided copper with sheath standard. Available Capillary Options:

  • Copper braided with copper core
  • Heavy Duty Vinyl coated with copper core
  • Stainless steel armour with copper core


  • CB = Center back remote ½" NPT connection, (FF & U cases).
  • BB = Back & Bottom (Dual) adjustable remote ½" NPT connection, (G case)
  • BA = Bottom Adjustable Angle direct mount ½" NPT connection. Without capillary. (P case) = (Marshalltown X-3)

BULB: 3 ½" sensing bulb standard. Cases 2", 2½", 3½", 4½" have ½" union nut standard.

RANGES: Six standard ranges DUAL SCALE in degrees Fahrenheit & Celsius.

  • - 40ºF to 65ºF / - 40ºC to 15ºC
  • - 40ºF to 120ºF / - 40ºC to 50ºC
  • 0ºF to 120ºF / - 15ºC to 50ºC
  • 0ºF to 180ºF / - 15ºC to 80ºC
  • 30ºF to 240ºF / 0ºC to 115ºC
  • 50ºF to 350ºF / 10ºC to 175º

DIAL STANDARD: Dual Scale Standard degrees Fº and Cº.

DIAL COLOR: Black markings on white.

POINTER: Standard Pointer.

WINDOW: 2", 2½", 3½" have twist-in Clearlok window. 4½" case has dimpled ring and acrylic window.

A vapor actuated thermometer is essentially a pressure system with a sensing bulb at one end connected by a capillary to a pressure gauge at the other. The bulb is filled with a liquid which vaporizes as the temperature rises. This causes the pressure in the guage bourdon tube to rise and move the pointer to indicate the measured temperature.

This temperature-to-pressure relationship is non-linear which means that the graduations on the line end of the scale are close together, whereas the graduation on the upper end are spaced farther apart. Changes in ambient temperature along the capillary or at the scale do not affect the thermometer readout. This means that capillary up to 75' long can be used without the need for ambient temperature compensation.

Marshall Instruments
Capillary Thermometers
Rev. 4/18/2024

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