4
IM 12E01B30-01EN
1st Edition : Mar. 30, 2021-00
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Safety Precautions
WARNING
Installation and wiring
The TB820D should only be used with equipment that meets the relevant IEC, American or
Canadian standards.
Yokogawa accepts no responsibility for the misuse of this unit.
Don’t install “general purpose type” instruments in the hazardous area.
Do not use an abrasive or organic solvent in cleaning the instrument.
Electrostatic discharge
The TB820D contains devices that can be damaged by electrostatic discharge. When servicing
this equipment, please observe proper procedures to prevent such damage. Replacement
components should be shipped in conductive packaging. Repair work should be done at
grounded workstations using grounded soldering irons and wrist straps to avoid electrostatic
discharge.
CAUTION
The Instrument is packed carefully with shock absorbing materials, nevertheless, the instrument
may be damaged or broken if subjected to strong shock, such as if the instrument is dropped.
Handle with care.
This instrument is a Class A product, and it is designed for use in the industrial environment.
Please use this instrument in the industrial environment only.
When you open the front cover, make sure the screws are completely out of the screw holes, and
then open the front cover slowly in order not to damage the threaded parts on the housing. If the
threaded parts are damaged and the screws cannot be tightened, the waterproof performance
will deteriorate.
Be careful to touch the concentrated sulfuric acid.