Page 2 - TABLE OF CONTENTS; SECTION AND TITLE
SD77 TABLE OF CONTENTS SECTION AND TITLE PAGE 1.0 INTRODUCTION .................................................................................................................................................6 1.1 MODEL DESIGNATION .......................................................................
Page 3 - LIST OF ILLUSTRATIONS; FIGURE AND TITLE; Introduction
SD77 LIST OF ILLUSTRATIONS FIGURE AND TITLE PAGE 1-1 Sample Rating Labels.............................................................................................................................................7 2-1 Transducer Installation and Mounting Dimensions ...................................
Page 4 - PREFACE; will
SD77 PREFACE Conventions and Symbols The following symbols may be used in this manual and may appear on the equipment. The reader should be familiar with the symbols and their meanings. Symbols are provided to quickly alert the reader to safety related text. Symbol Meaning DANGER Indicates an immedi...
Page 8 - PRODUCT CERTIFICATIONS; Note: Approval agency certificates follow page 12.; ATEX Installations
SD77 1.3 PRODUCT CERTIFICATIONS FM Approval Intrinsically Safe................................................... Class I, Division 1, Groups A, B, C, and D Class II, Division 1, Groups E, F, and G Class III, Division 1 when installed in accordance with drawing 15032-7704 or 15032-7705 Non-Incendive...
Page 23 - FIGURE 2-1 Transducer Installation and Mounting Dimensions
SD77 FIGURE 2-1 Transducer Installation and Mounting Dimensions 23
Page 24 - FIGURE 2-2 Transducer with Mounting Bracket Dimensions; FIGURE 2-3 Pipe Mount Bracket Dimensions
SD77 FIGURE 2-2 Transducer with Mounting Bracket Dimensions U-BOLT FOR VERTICAL2" PIPE MOUNTING 2.81 5.69 6.13 .34 2.81 3.50 .34 .34 DIA. HOLE FORWALL MOUNTING .28 DIA. HOLE FORMOUNTING BRACKET TOTRANSDUCER1/4-20 X 1/2" FIL. HD.SCREWS (2) SUPPLIED .44 MG 005 9 2 FIGURE 2-3 Pipe Mount Bracket...
Page 26 - Do not
SD77 2.3 PIPING The supply (IN) and output (OUT) connections on the transducer are 1/4 inch NPT. See Figure 2-1. Quarter-inch O.D. tubing is recommended for piping to the transducer. Before making connections, blow out all piping. Use pipe sealant sparingly and then only on the male threads of the t...
Page 27 - The recommended wire size is 22 AWG (0.38 mm; Note
SD77 FIGURE 2-6 Terminal Enclosure 2.7 SHIPPING AND RESTRICTION SCREWS The transducer has a shipping screw in the center of the top housing to protect the transducer's nozzle during shipment. A restriction screw (stamped R) is located just behind the shipping screw. These two screws must be intercha...
Page 28 - Intrinsically Safe Models; Check all signal and ground connections.
SD77 2.8.1 Intrinsically Safe Models A Model 77F transducer is considered intrinsically safe only when it has a nameplate with the FM logo and the words INTRINSICALLY SAFE. Install the transducer in strict compliance with the instructions furnished by the barrier manufacturer and in accordance with ...
Page 29 - FIGURE 3-1 Schematic
SD77 3.0 OPERATION The input coil and the float are attached to a common center shaft and make up what is referred to as the “moving coil assembly.” This assembly is free to move vertically. The float is submerged in Silicone fluid and is sized so that the resultant buoyant force equals the weight o...
Page 30 - Connect the test equipment to the transducer.; RANGE CHANGE
SD77 4.0 CALIBRATION The E/P Transducer must be positioned so that it is upright and vertical. Tilting within 10 degrees of vertical will not affect operation. If the transducer has been lying on its side, set the unit upright and allow approximately 15 minutes before performing calibration. This wi...
Page 35 - Cover; FIGURE 5-2 Conversion Parts; Invert the transducer.
SD77 5.6 MODEL 77 TO MODEL 77-R CONVERSION With this conversion, the transducer will have a reverse acting output (e.g. 4 mA =15 psig and 20 mA = 3 psig). The parts needed for conversion are listed below. Description Part Number Quantity 12624-4 Spring 1 12392-53 Gasket 1 10660-501 Bottom Cover 1 12...
Page 36 - Siemens Model Series 77 Electric-To-Pneumatic Transducer; IMPORTANT
SD77 6.0 PARTS LIST Siemens Model Series 77 Electric-To-Pneumatic Transducer Drawing No. 12334-300PL 5/91 Supersedes 12334PL 8/84 IMPORTANT Service Parts Kits are available for servicing the instrument. Contact Siemens for available kits; refer to the Customer/ Product Support section of this instru...
Page 39 - HAZARDOUS LOCATION INSTALLATION DRAWINGS
SD77 7.0 HAZARDOUS LOCATION INSTALLATION DRAWINGS FIGURE 7-1 Intrinsically Safe Installation with Safety Barriers, Model 77 or 771 39
Page 41 - FIGURE 7-3 Intrinsically Safe Installation, Approved Barriers
SD77 FIGURE 7-3 Intrinsically Safe Installation, Approved Barriers 41