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Dresser engineers have developed a new generation of test gauges to meet the exacting needs of instrument engineers and quality specialists. The new Ashcroft® test gauge can be used as a transfer standard for periodically checking the accuracy of pressure instruments or as a laboratory instrument for research and test labs. The wealth of new features make it an excellent test gauge for process applications where high accuracy in pressure measurement is essential.
External adjustable dial facilitates compensation for tare or zero adjustment on standard case style Type 1082(*)S only. Temperature compensated movement that significantly reduces temperature error. Conventional test gauge accuracy is adversely affected as the ambient temperature varies from that at which the gauge was calibrated.
This inaccuracy can be as much as 0.02%/°F or 1⁄2% for a 25°F temperature change. The 4 1⁄2" and larger Ashcroft test gauges include a special bimetallic element which automatically reduces ambient temperature errors to less than 0.005% per degree F.
Some manufacturers reduce temperature error by using NiSpan C® for bourdon tubes. This material is subject to serious corrosion problems in some applications. The Ashcroft temperature compensated movement allows use of Monel® bourdon tubes for corrosion resistance superior to NiSpan C while still providing excellent temperature stability.
This device permits precise adjustments to achieve exact span calibration from 0 to 100% of scale. The micrometer screw attached to the slide will vary the span by approximately 1⁄2% per 360° rotation.
The long life bourdon tube is capable of sustained accuracy, yet is suitable for process applications. The Ashcroft test gauge uses the Ashcroft Duragauge® pressure gauge bourdon tube – perhaps the most highly developed bourdon tube in the world. Proven and refined by years of rugged service in demanding process applications around the world, this outstanding pressure element is standard in all 4 1⁄2", 6" and 8 1⁄2" size Ashcroft test gauges.
Hydraulically staked movement provides improved stability. The movement, with Teflon® coated gears and bearings, uses a unique hydraulic staking operation to ensure a rigid movement frame that resists shift due to shock and vibration. High and low pressure movement stops are standard to protect the gauge against calibration shifts caused by accidental overpressure, and to limit pointer rotation. Improved dial and pointer results in excellent readability. Larger numerals, additional graduations and a highly polished mirror band combined with a knife edge pointer with red painted tip to allow precision readability that eliminates parallax error.
Test gauges are built in a modern manufacturing environment. Assembly, calibration and inspection are performed in a climate controlled manufacturing cell to ensure consistent product quality. Computer set pressure standards give accurate calibration that is traceable to NIST (National Institute of Standard & Technology – formerly NBS). A skilled technician is responsible for building, calibrating and final inspection of each test gauge. The technician’s signature attached to the gauge guarantees ASME B40.1, Grade 3A (0.25%) full scale accuracy.
The standard test gauges are now available from stock. The new standard 4 1⁄2", 6" and 8 1⁄2" 1082 gauge line is supplied with solid front case for safety. Corrosion resistant black epoxy finish is standard.
Tube and Socket Material: | (A) Phosphor bronze tube, brass socket |
Accuracy: | ±0.25% of span (ASME B40.100 Grade 3A) |
Ranges: | Vacuum, Compound to 400 psi |
Dial Size: | 4 1⁄2", 6", 8 1⁄2" |
Process Connection Location: | Lower or Back |
Process Connection: | ¼ NPT Male or ½ NPT Male |
Window Material: | Glass |
Dial: | Externally adjustable aluminum, black numerals with polished mirror band |
Ring: | Hinged steel, black wrinkle finish |
Case Style: | Solid front |
Movement: | 400 Series SS rotary design, Teflon S coated bearings, micrometer span adjustment, bimetallic temp. compensator (0.005%/per °F Max. temperature error) |
Pointer: | Black painted aluminum with red-painted, knife edge tip |
Mounting Options: | Stem or flush |
Weather Protection: | Case not sealed, recommened for weather protected environment only |
Approvals: | CE/UKCA, CRN |
Available Ranges:
This rugged, solid front aluminum case has a threaded aluminum front ring. Both case and ring have a black epoxy finish. This case style has no back flange. It is a durable weatherproof case with an epoxy finish that stands up well to most environmental conditions. It is available with lower or back connection, in 4 1/2 dial size only.
This is a solid front aluminum case with a back flange. It has a threaded black polypropylene ring. This case is weatherproof and is black epoxy finished to stand up well under most environmental conditions. It can be stem, surface or
Case Type 1082 XTY:
Case Type 1082 XQY:
This unique design is a solid front black polypropylene, fiberglass reinforced impact resistant case with bayonet ring. It can be stem, surface or flush mounted with lower or back connection, in 6 dial size only.