VA and GA Series
Vapor and Gas Actuated Thermometers
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Remote vapor- and gas-actuated thermometers are
manufactured to the highest standards for a wide range of uses and can be
fitted into almost any temperatureindicating application. These
instruments are ideal for remote reading, such as panel installations,
with capillary lengths of 1 to 100'. Vapor, or more precisely vaporized
liquid, thermometers will give excellent readings, provided the temperature being measured is above or below ambient temperature.
Vapor instruments also have progressive graduations and are
best read in the upper 2/3 of the dial range. Many ranges are available
between -40 to 232°C (-40 to 450°F), and care should be taken to select a range that will locate the operating temperatures within the upper 2/3 of
the dial range.
OMEGA gas-actuated thermometers combine advanced gas coil technology
with a state-of-the-art gas absorbent (Class IV) thermal system, producing a
superior temperature measurement instrument that can be fitted to a wide
variety of applications. Gas-actuated thermometers have an advantage
over vapor-actuated thermometers in that they are more accurate over the
full range. They also operate at higher and lower ranges than vapor-actuated
The linear dial on all OMEGA gas thermometers provides a consistent
1% accuracy across the full span of each range. This, combined with
over 20 Fahrenheit and dual ranges, from -196 to 649°C (-320 to 1200°F), provides complete coverage of all normal temperature requirements.
Dial Sizes: 2", 2½", 3½", 4½"
Dial: Aluminum with white finish and black markings
Pointer: Furnished standard adjustable
Movement: Brass with precision gearing
Bourdon Tube: Vapor-phosphor bronze
Gas: Nitrogen in nispan coil
Vapor: ±1 scale division
Gas: ±1% of scale
Process Connection: Plain bulb, ½NPT union; or thermowell
Note: thermowells must be used whenever the bulb would be exposed to pressure, fluid velocity, or corrosive media.
Window: Polycarbonate STD; glass available on all models
Bulb: Stainless steel or copper; bulb O.D. 3/8" on plain bulbs, 7/16" with threads. Bulb lengths from 2½" to 7 7/8" depending on capillary length.
Capillary: Copper, copper with bronze braid armor; stainless steel with stainless steel armor; capillary lengths 1 to 100' (standard length, 5')