Emerson Type 289Rc Exhaust Booster Data Sheet
2015-03-30
: Emerson Emerson-Type-289Rc-Exhaust-Booster-Data-Sheet-681389 emerson-type-289rc-exhaust-booster-data-sheet-681389 emerson pdf
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Bulletin 71.8:289RC July 2010 Type 289RC Throttling Exhaust Booster W7313 W7322 Figure 1. Type 289 Throttling Exhaust Booster Figure 2. Type 289 Throttling Exhaust Booster Sectional View Introduction Features The Type 289RC is a high-capacity, throttling exhaust booster designed to provide throttling “release control” (RC) control pressure to actuators, pneumatic devices, and related systems that require rapid response (i.e. surge valves or recycle valves on compressors). These exhaust boosters are normally used on control valve actuators to speed up the proportional operation of a control valve in response to sudden pressure changes from pneumatic output devices such as solenoid valves or pneumatic instruments. The one way throttling action offers superior control with exceptional stability. • Rapid Response—By accurately matching the instrument and actuator performance with the bypass valve adjustment, the Type 289RC reduces overshoot and related problems while allowing very fast positioning response to system requirements. • High Volume—The boosting system allows the Type 289RC to provide high flow rates with minimum pressure buildup. D103080X012 • Throttling Type Exhaust Booster—The smooth, sensitive throttling action minimizes pressure surges caused by system fluctuations. www.fisherregulators.com Bulletin 71.8:289RC Specifications Body Size(1) 1 NPT Inlet and Outlet Connections Inlet: Connect to the outlet via a bypass valve, adjustable from 0 to 0.3 Cv. (Piping is normally configured by the customer.) See Figure 3. Signal: 1/8 NPT (standard) Outlet Connection: 1 NPT Maximum Pressure(1) 125 psig (8,6 bar) Dead Band Static: Bypass valve closed, less than 10% of the control pressure Dynamic: Bypass valve open, variable from 0 to 10% of the control pressure Maximum Exhaust Flow Capacity Cv = 22. System capacity limited by the smallest restriction between the exhaust valve and pressure source Temperature Capabilities(1) -20° to 180°F (-29° to 82°C) Input to Output Pressure Ratio Fixed at 1 to 1 Approximate Weight 4 pounds (2 kg) 1. The pressure/temperature limits in this Bulletin and any applicable standard or code limitation should not be exceeded. type 289RC Bypass Valve Adjustable from 0 to 0.3 Cv 45 to 125 psig (3,1 to 8,6 bar) Instrument supply I/P 4 to 20 mA A7208 Figure 3. Typical Type 289RC Throttling Exhaust Booster and Control Valve Installation 2 PERCENT OF CURRENT (4 TO 20 mA = 100) PERCENT OF ACTUATOR TRAVEL (1.5-INCH (38 mm)= 100) Bulletin 71.8:289RC 110 INPUT SIGNAL 0.080 SECONDS OF DEAD TIME ACTUATOR TRAVEL 90 80 70 60 0.320 SECONDS, 85% FULL STROKE 50 40 30 20 10 -10 -0.1 0.1 0.2 0.3 0.4 0.5 TIME IN SECONDS A7218 (Using a Type 546 I/P Transducer with 4 to 20 mA input signal, 6 to 30 psig (0,41 to 2,1 bar) output, and 35 psig (2,4 bar) supply pressure; a Type 657 or 645 Valve Actuator with 10 to 26 psig (0,69 to 1,8 bar) setting and 0 to 1.5-inches (0 to 38 mm) of travel; and a Type 289RC Exhaust Booster with a bypass valve.) Figure 4. Typical Response Curve for Type 657 size 45 Actuator with Type 289RC Throttling Exhaust Booster Installation The instrument connection must be made to the spring case, 1/8 NPT fitting. The actuator is connected to the 1 NPT side port. The inlet and outlet must be connected via an adjustable bypass valve. Flow through the exhaust valve must be as indicated by the flow direction arrow on the body. See Figure 3. Principal of Operation The Type 289RC 1 NPT output port is connected directly to a spring return actuator and the 1/8 NPT inlet port is connected to the controlling instrument (I/P transducer, positioner, controller, etc.). The inlet and outlet chambers connected through a needle valve. The needle valve is adjusted on the control valve system to account for differences in various instrument and actuator performance characteristics. Once this adjustment has been accomplished the control valve action is described as follows: As the output pressure of the instrument increases the actuator moves the valve normally since the exhaust booster cannot be actuated in this manner. When the output pressure of the instrument decreases the actuator will move the valve normally until the rate of change of the output pressure exceeds the capacity limit of the needle valve. When this occurs, the pressure drop in the Type 289RC causes the booster exhaust valve to open and quickly drop the pressure in the actuator. Because of the throttling action of the Type 289RC, the booster exhaust valve closes as the pressure difference between the instrument and actuator decreases and the control valve system resumes normal operation. Ordering Information Refer to the Specifications section on page 2. Carefully review the description below each specification to be sure exhaust booster meets the needs of the application. Specify the product type number to your local Sales Office. 3 Bulletin 71.8:289RC Industrial Regulators Natural Gas Technologies TESCOM Emerson Process Management Regulator Technologies, Inc. Emerson Process Management Regulator Technologies, Inc. Emerson Process Management Tescom Corporation USA - Headquarters McKinney, Texas 75069-1872 USA Tel: 1-800-558-5853 Outside U.S. 1-972-548-3574 USA - Headquarters McKinney, Texas 75069-1872 USA Tel: 1-800-558-5853 Outside U.S. 1-972-548-3574 USA - Headquarters Elk River, Minnesota 55330-2445 USA Tel: 1-763-241-3238 Asia-Pacific Shanghai, China 201206 Tel: +86 21 2892 9000 Asia-Pacific Singapore, Singapore 128461 Tel: +65 6777 8211 Europe Bologna, Italy 40013 Tel: +39 051 4190611 Europe Bologna, Italy 40013 Tel: +39 051 4190611 Gallardon, France 28320 Tel: +33 (0)2 37 33 47 00 Middle East and Africa Dubai, United Arab Emirates Tel: +971 4811 8100 Europe Selmsdorf, Germany 23923 Tel: +49 (0) 38823 31 0 For further information visit www.fisherregulators.com The Emerson logo is a trademark and service mark of Emerson Electric Co. All other marks are the property of their prospective owners. Fisher is a mark owned by Fisher Controls, Inc., a business of Emerson Process Management. The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not to be construed as warranties or guarantees, express or implied, regarding the products or services described herein or their use or applicability. We reserve the right to modify or improve the designs or specifications of such products at any time without notice. Emerson Process Management does not assume responsibility for the selection, use or maintenance of any product. Responsibility for proper selection, use and maintenance of any Emerson Process Management product remains solely with the purchaser. ©Emerson Process Management Regulator Technologies, Inc., 2003, 2010; All Rights Reserved
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