Azbil JTD720A, Руководство пользователя, Страница: 19 / 76

Model JTD720A - Smart Multivariable Transmitter 2-1
Chapter 2 : Installation
Overview of chapter 2
Instructions for the installation of pipes and cables associated with this transmitter.
Also covers installation of the transmitter. For users that are responsible for
installation work.
2-1 : Installation environment
2-1-1 : General environmental conditions
Introduction
Install under environmental conditions specified here, to fully exploit transmitter
performance over long periods.
Always install an explosion-proof transmitter where regulations demand such
precautions.
When installing explosion-proof models, follow the guidelines in Recommended
Practices for Explosion-Protected Electrical Installations in General Industries
(2006, for gases and vapors) or Users’ Guidelines for Installations for Explosive
Atmospheres in General Industry, which are technical recommendations from the
National Institute of Occupational Safety and Health.
Environmental conditions
Select a location to meet the following conditions:
• Temperature fluctuations should be as small as possible
• Avoid installing in locations that are exposed to radiated heat from other plant
equipment.
• Insulate against freezing in the measured fluid or sealing liquid.
• Select a location where shocks and vibrations are as small as possible.
• Avoid installing in corrosive atmospheres.
• External zero-adjustment function is an option that may be subject to output
fluctuations if installed near to sources of strong magnetic interference. Install
such models at least 1 m remote from plant equipment producing strong magnetic
interference as over 10 gauss measured where a motor or a pump is installed.