ITT Barton Model 200

  The ITT Barton Model M200A is a 6" DP indicator powered by ITT Barton’s M199 rupture-proof DPU. The indicating pointer travels over a 6-inch (150 mm) diameter dial through a 270° arc. Scales are calibrated in standardized increments for DP or liquid level measurement. Square root graduations are visible for immediate flow rate indications, and custom scales are available to indicate the level or quantity of fluid in tanks.

The ITT Barton Model M200A is widely used in the chemical and petroleum industry. It provides robust operation and high accuracy in applications involving liquefied gases (LOX, CO2, ammonia, nitrogen, helium, hydrogen, and argon). The ITT Barton Model 200 is available in steel and stainless steel and has several safe working pressures to suit your application. It is actuated by the Model 199 DPU. 

The DPU consists of flexible bellows secured to a center plate. The movable bellows are rigidly connected by a dual valve stem that passes through the center plate.

Valve seats in the passage through the center plate form a seal, with the valves spaced on the stem. A drive arm pivoted on the end of a sealed torque tube contacts the valve stem in the center plate. 

The interior of the bellows and center plate are filled with a clean, non-corrosive, low
freezing point liquid. A free-floating bellows is attached to the high-pressure
bellows to allow for expansion or contraction of the fill liquid, thus providing positive
temperature compensation. If the bellows are subjected to a pressure difference
greater than the differential pressure rating of the unit, a valve mounted on the
center stem seals against its corresponding valve seat. As the valve closes, it “traps”
the fill liquid in the bellows; thus the bellows are fully supported and cannot be
ruptured regardless of the overpressure applied within the limits of its safe working pressure. Since opposed valves are used, protection against “over-range” is provided in either direction.

Pressure is applied to the high and low chambers surrounding the bellows. Any difference in pressure causes the bellows to move until the spring effect of the unit balances out. The linear motion of the bellows (proportional to the DP) is transmitted as a rotary motion through the torque tube assembly.

 The unit has a 6" dial in an aluminum case. The pointer travels over a 270-degree arc. Bellows are constructed of individual diaphragms, stamped and formed from 316 stainless steel or inconel, are assembled using a resistance welding technique, resulting in exacting linearity characteristics, a long cycle life, and freedom from effects of work hardening commonly
encountered with the hydraulically formed or mechanically rolled types. 

 An auxiliary free-floating bellows attached to the HP bellows automatically protects the unit from zero/calibration drift when ambient temperature changes. Pulsation Dampener (Model 199 Only) The pulsation dampener in the M199 is externally adjustable and provides for direct control of the instrument's response time from approximately one second to several minutes for full-scale travel of the bellows. 

 Designed on the top and bottom of the housing, these connection ports provide automatic liquid draining or venting of gases. 

 The range springs' strength determines the unit's differential pressure range. Each range-spring assembly is stamped with DP range it produces. They have an extremely low

hysteresis characteristic and exceptional temperature stability.

 There are many options available for applications requiring external sealed sensors, such as corrosive, high-temperature, and dangerous fluids. Please consult us to determine the best type for your application. 

Housings and Safe Working Pressures

Forged Steel.........................................SWP 2500, 4500, & 6000 PSI (172, 310 & 413.8 bar)

316 Stainless Steel...............................SWP 1000, 3000, & 6000 PSI (69, 206.9 & 413.8                                                                  bar)

Cast Aluminum ....................................SWP 100 PSI (69 bar)

Bellows Material

316 Stainless Steel 

Inconel 625

DP Ranges

0-10" W.C to 0-100 PSI

Actuating Unit.......................................Model 199 DPU

Dial Size.................................................6 Inches (150mm) Diameter

Temperature Limits.............................-40°F/C to + 180°F (+80°C), +35°F  to 180°F (+1°C to +80°C)      ................................................................minimum for water filled units- "D" Fill)

Adjustments........................................ Zero and Span (Micrometer-type)

Mounting..............................................Flush/Panel, Wall, and 2"Pipe/Yoke, 

Indicator Case......................................Aluminum Alloy, Powder Coated, Enamel or Epoxy Finish

Lens.......................................................Polycarbonate

O-Rings (Wetted)..................................Buna-N, Viton, or EPT (Special available upon request)

Overall Dimensions.............................Per configuration and DPU housing rating

Weight ..................................................Approx. 30 to 45 lbs (approx.) Weight depends on DPU                                                                  configuration/materials.

Accuracy (DP Range)

Ranges 0-10" to 0-349".........................................±1/2% of full scale

Ranges 0-350" to 0-100 PSI..................................±3/4% of full scale