Siemens ET 77E Series Specifications

INSTALLATION AND SERVICE INSTRUCTIONSiemens Industry, Inc. SD77 Rev. 26 March 2013 Supersedes Issue 25 Model Series 77 Electric-To-Pn

SD77 Ex ia Requirements: Models 77abB1d1, 77abB3d, and 77abB5d are suitable for use in Zone 0 and Zone 1 surface industry explosive atmospheres for g

SD77 1.3.3 CSA Hazardous Location Precautions This section provides CSA hazardous location precautions that should be observed by the user when ins

SD77 1.4 CUSTOMER/PRODUCT SUPPORT For support and the location of your local Siemens representative, refer to the table below for the URL of the Proc

SD77 TABLE OF CONTENTS SECTION AND TITLE PAGE 1.0 INTRODUCTION...

SD77 2.0 INSTALLATION This section describes transducer installation for both hazardous and non-hazardous locations. Each E/P Transducer nameplate sh

SD77 FIGURE 2-1 Transducer Installation and Mounting Dimensions 23

SD77 FIGURE 2-2 Transducer with Mounting Bracket Dimensions U-BOLT FOR VERTICAL2" PIPE MOUNTING2.815.696.13.342.813.50.34.34 DIA. HOLE FORWALL

SD77 Metric Housing Standard Housing with Adapter FIGURE 2-4 Transducer Housings for Metric Conduit 2.2 INSTRUMENT AIR REQUIREMENTS Connect

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 recommen

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 p

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 w

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.

SD77 LIST OF ILLUSTRATIONS FIGURE AND TITLE PAGE 1-1 Sample Rating Labels...

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

SD77 5.0 MAINTENANCE This section presents transducer maintenance procedures. CAUTION Improper servicing and/or substitution of components may impa

SD77 5.3 TROUBLSHOOTING Refer to the trouble analysis table below when troubleshooting the transducer. A transducer input signal must be present and

SD77 5.4 COIL ASSEMBLY REPLACEMENT Removal When the transducer's top housing is removed, care must be taken to prevent metal chips, dirt, and

SD77 3. Rotate the coil on the center shaft so that the leaf springs are perpendicular to the clamping plate and equidistant from the center shaft. 4

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

SD77 6.0 PARTS LIST Siemens Model Series 77 Electric-To-Pneumatic Transducer Drawing No. 12334-300PL 5/91 Supersedes 12334PL 8/84 IM

SD77 ITEM PART NO. DESCRIPTION QTY. 1 2419-21 Float Spring 1 2 2900-23 Sealing Screw 2 2a 2900-23 Sealing Screw (For units with tapped exha

ITEM PART NO. DESCRIPTION QTY. 152 ---- Coil Assy. (See Table below) 1 153a ---- ---- ---- 153b ---- ---- ---- 153c ---- ---- ---- 154 5-

SD77 7.0 HAZARDOUS LOCATION INSTALLATION DRAWINGS FIGURE 7-1 Intrinsically Safe Installation with Safety Barriers, Model 77 or 771 39

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

FIGURE 7-2 Intrinsically Safe Installation, Model 77 or 771 & Foxboro Spec 200 or Interspec Nest 40

SD77 FIGURE 7-3 Intrinsically Safe Installation, Approved Barriers 41

FIGURE 7-4 Intrinsically Safe Connection Diagram, Model 77 and 771, Entity Parameters 42

SD77 For the purpose of this manual and product labels, a qualified person is one who is familiar with the installation, assembly, commissioning, an

SD77 1.0 INTRODUCTION This manual describes the installation, operation, and maintenance of Model Series 77 Electric-to-Pneumatic Transducers. These

SD77 FIGURE 1-1 Sample Rating Labels 1.2 GENERAL SPECIFICATIONS Supply Pressure Normal...

SD77 1.3 PRODUCT CERTIFICATIONS FM Approval Intrinsically Safe.....Class I, Division 1, Groups A, B, C

SD77 Do not exceed 42 Vdc in service. WARNING Ex nA models are shipped with the sealing screw fitted externally. Do not remove the sealing screw. Do