Operation Manual

2-5
IM 1F5B2-01E
2. HANDLING PRECAUTIONS
2.8 Notes on JIS Flameproof Flowmeters
CAUTION
Models of ULTRA YEWFLO with the optional JIS flameproof feature are designed to
operate even in a hazardous atmosphere (Class 1 or Class 2 Area) that may produce the
explosive gas or gases indicated in the Users’ Guidelines for Explosion-Protected,
Factory-Use Electrical Equipment (Protection against Explosive Gas Atmospheres—
1994).
Adequate precautions must be taken to ensure safety when mounting, wiring and piping
equipment of flameproof construction. For safety reasons, regulations are imposed on
the maintenance and repair of such equipment. Before doing any such work, ALWAYS
be sure to read “Installation and Operating Precautions for Flameproof Explosion-
Protected Instruments” at the end of this manual.
2.9 Installation Precautions for CENELEC (KEMA)
Intrinsic Safety
• Electrical Data
In type of explosion protection intrinsic safety EEx ia IIC only for connection to a
certified intrinsically safe circuit with following maximum values:
Umax = 30V
Imax = 165mA
Pmax = 0.9W
Effective internal capacitance Ci = 6nF
Effective internal inductance Li = 730µH
• Installation
All wiring shall comply with local installation requirements. (Refer to the installation
diagram)
Installation Diagram
* Integral Type
Hazardous Location Non Hazardous Location
Flowmeter
(UYF200-A)
+
SUPPLY
–
PULSE
+
+
–
Safety
Barrier 1
* Note 1
+
–
Safety
Barrier 2
* Note 1