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Barton Chart Recorders 242E
Models 202E, 202ER, 202N, 242E, and J8A
Barton chart recorders are the industry standard for accurate, reliable measurement and recording of pressure, differential pressure, and temperature in a wide variety of applications. In
addition, DP models utilize Barton’s rupture-proof bellows DPU as the actuating unit — with features like overrange protection and pulsation dampening (on some models).

Common Components

Case — is made of rugged, lightweight die-cast aluminum that features a built-in rain-shield. It is finished in
polyurethane electrostatic powder paint that has a high resistance to weathering, scratches, and industrial fumes. aircraft-type door hinge (made of 302 SST) provides excellent resistance to salt spray and H 2 S. A closed neoprene gasket, non-absorbent to fluids and resistant to oils and most solvents, provides the seal between the door and the case. Optional “S” versions use a stainless steel case or a corrosion resistant “offshore coating” for harsh saltwater environments.

Overview

Chart Drive — available in battery and spring-wound versions with a wide variety of chart speeds. All chart drives, with simple positive chart lock hub, are interchangeable.

Charts — are made from moisture-resistant, 7-point paper with high-grade copper engravings that eliminate eccentric and elliptical errors. All models, except J8A, utilize 12-inch circular charts that are interchangeable with Graphic Controls or Bristol charts. The J8A utilizes compact 8-inch charts.

Recording Mechanism — All parts are stainless steel for long life. The pen mount is exceptionally rugged and pen shafts are fitted with ball pivots to minimize friction. All links are adjustable, with micrometer adjustments for accurate calibration. A cam screw allows rotation of the pen mounting for accurate tracking of pens on the chart time arc. All adjustments have screwdriver slots to simplify calibration. Disposable pens are standard.

Pressure Elements — used in Models 202E, 242E, and J8A are precision wound helical-type available in a variety of materials — pressure ranges from 0-30’’ mercury vacuum (0 - 14.7 psi/1 bar) to 0 - 30,000 psi (0 - 2,068 bar). The Model 202N uses a K-Monel element — pressure ranges from 0 - 200 psi (0 - 14 bar) to 0 - 6,000 psi (0 - 414 bar). Connections available in 1/4’’ NPT for ranges less than 10,000 psi (689 bar).
Ranges greater than 10,000 PSI (689 bar) utilize an Aminco 9/16–18 (1/4’’ ODT) female connection.

Thermal Systems — consist of a bourdon tube, a capillary (w/SST armor), and a bulb (w/bendable extension). All parts are SST. Systems available in Class V (mercury fill w/11/16"
O.D. bulb) or Class I (hydrocarbon fill w/3/8" O.D. bulb). Invar
available in Class V only. Standard temperature ranges are: 0°F
to +[100, 150, 200, or 300]°F (-18°C to +[38, 66, 93, or 149]°C).
Class VA (self/full compensation): -40°F/°C to +1200°F
(+649°C)[self] or +600°F (+316°C)[fully]
Class VB (Case compensated): -40°F/°C to +600°F (+316°C)
Class IA (full) & IB (self): -200 to +500°F (-129 to +260°C)
Accuracy: ±1.0% of F.S.
Hardware: Capillary standard length is 10 ft. with additional
lengths available.

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