Electrical Relay Diagram Symbols
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEge7VU75jA_2GiyJrACKl-G-gS3ocG1QRJyiN975yl6AEHx_47uRgAn3YwgI01NgLBDOOiXuANlONAqZJPAXtzI1oK41_ZEd6MtmXkVpvde2LP2uJ0QKDSZcPe172tbbTy-gbS2Mm8gPads/s400/a.jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh64QNYnyb8Uk-TqvTOy_8IZeI7Spi4y7KLpkLOUfzBUlFw9rQoux33fzbfP0A0wwGc1t6SN2rtj5-sUIw2g-UKu6XIacL1z1k7X-wjnV_MnbiKGBKG0hExOrw_zvHZaJufuXAovfc1pC_P/s400/b.jpg)
P&ID SYMBOLS
Instrument Line Symbols
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEitaUiUb4E6vxdr5JA-lPbrGTakn_visky1YJy1wikEvLriHAQByq8lLXN4ahsH5aTvHMUde32H7-ivSkiVRgOuSoeDsIKbVtm9xB8E7o0wCTT7ElpdHa7j3yrvkn-3mu1yMqBVeSs3dqOq/s400/c.jpg)
Symbols for transducers and elements
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhCPIqH4WnRmsyWxoUPTB_YcQaF62UAlxt_oYNVFp6vN-LP7OvWbDDkeaRgzUzH0-COaR8_koSeiExThX6bRMkK_e3hS19o9EIuKkff_tB5EjC8-YVMNgwWCSvrq2dlIc4lFW4zg-xU42_o/s400/d.jpg)
INSTRUMENT IDENTIFICATION LETTERING
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjvfTrOpge3m0zyNLhUbPrnuAZF3cdcfcRNY6UfA9pS0xIV21z8dvUcC4o1UbyGK16VILrzuSzbjKhofM1DIGme7k7XxWhUdY2zO8bZMFERz7pZarSH7fFxcF2OMyXnY15FkBQ_2Z8k_kQF/s400/e.jpg)
Reference: ANSI/ISA-S5.1-1984, Instrumentation Symbols and Identification, ISBN 0-87664-844-8
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