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Vapor Actuated
Item: MT-VA

Vapor Actuated Capillary Thermometers from Marshalltown Tempco
  Products > Capillary Thermometers
Vapor Actuated
Item: MT-VA

Vapor Actuated Thermometers bring economy and accuracy to remote measuring applications within the (- 40º to 350ºF) range.

Two basic styles allow either remote mounting of the temperature scale (as far as 75 feet from the sensing bulb) or direct mounting of the Thermometer for local temperature indication. Remote reading units offer, as standard, 6 feet of flexible capillary with double-braided copper armor for greater mechanical protection. Capillaries on center back models are reinforced with stainless steel coiled armor at the case. Bulbs are 3.5" standard ½" NPT union connection.


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.

Marshalltown Tempco
Capillary Thermometers
Rev. 10/5/2011

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