CAUTION
CAUTION
CAUTION
CAUTION
WARNING
WARNING
WARNING
2
Model EA91A＆EA90A
SAFETY INSTRUCTIONS
1
ⅡC T6
ⅡC T5
EA91A
EA90A
1.1.1 Compliance with Safety Instructions
When handling and operating the electro-pneumatic valve positioner, all the safety instructions herein should
be securely followed.
1.1.2 Conformance with Specifications
Both the Model EA91A Electro-pneumatic Valve Positioner (flameproof explosion-protected construction) and
the Model EA90A Electro-pneumatic Valve Positioner (intrinsically safe explosion-protected construction)
have been approved in accordance with the Labor Safety and Hygiene Law of "Technical Criteria of Electrical
-mechanical Equipment Explosion-protected Construction"(hereafter referred to as "Technical Criteria").
The certified seal, and the nameplate or the cautionary label describing the specifications to be required
protecting explosion are attached to each valve positioner in conformance with all specified requirements.
Check the items described in the certified seal, and the nameplate or the cautionary label, and use this
product.
1.1 General Safety Instructions
1.2.1 Limitation of Installation Locations
The EA91A Valve Positioner can be installed in the hazardous area according to the available explosive gas
of the valve positioner.
However, do not install the EA91A Valve Positioner in the Class 0 hazardous area.
1.2.2 Maintenance during Operation
Do not perform maintenance of the EA91A valve positioner while the power is being turned ON. When
performing maintenance by opening the terminal box with the valve positioner turned ON due to
circumstances, carefully make sure before and during maintenance that the explosive gases are absent using
gas detector.
When impossible to check whether the explosive gases are absent or not, maintenance must be limited to
visual inspection and adjustment of movable parts not requiring the opening of the terminal box such as
zero adjustment and stroke adjustment. Be careful not to generate impact sparks during this maintenance.
1.2.3 Repairs
a ) Turn OFF the power and move the EA91A Valve Positioner to safety place before repairing.
b ) Both mechanical and electric repairs are. limited to restoring the valve positioner to its original condition
in principle.
c ) The use is limited to the repairable degree only using general tools without soldering iron.
1.2.4 Protection against Conventional Short-circuit Current
The coil part filled with resin of the EA91A Valve Positioner is the special explosion-protected construction
compliance with the Technical Criteria. This Technical Criteria requires the "protection against 4000A
conventional short-circuit current for the electrical device or part with resin-filled construction to be
connected to the external power supply". For the host device such as controller to be connected to the EA91A
Valve Positioner, use fuse or breaker with breaking capacity 4000A or more.
"WARNING" seal is affixed on terminal box.
1.2 Safety Instructions on Model EA91A Electro-pneumatic Valve Positioner
Applicable
Explosive Gases
Installation Location
Explosion-protection Type
Model No.
Intrinsic Safety Type
Technical Criteria, Ex ia ⅡC T6
Flameproof Type
Technical Criteria, Ex sd ⅡC T6X
All gases classified in Group left and Div.1 and 2 Hazard
-ous Area. Non-Hazardous Area. (Locations specified in
Technical Criteria and Division 1 and 2 Hazardous Area)
All gases classified in Group left and Div.0, 1 and 2 Hazard
-ous Area. All Non-Hazardous Area. (Locations specified in
Technical Criteria and Division 0,1, and 2 Hazardous Area)
1.1.3 Prohibition of Changing Specifications and Modifications
Do not change the specifications or modify the valve positioners by user.
