IM 61A YHC1-E-A
3rd Edition: May 2008
Page 14 of 34
HAZARDOUS AREA USE
Intrinsically Safe Operation
The YHC 4150X HART Communicator includes ATEX certification for Intrinsically Safe operation. Refer
to the Intrinsic Safety Control Drawing in the Appendix of this manual for more information. The following
table identifies YHC model numbers and areas of acceptable use.
Model Number
Use Description
Non-hazardous Area
Hazardous Area
YHC 4150X
Intrinsically Safe
√
√
YHCs with Intrinsically Safe certification can be identified by model number or by a special name plate on
rear of the unit. A sample of the Intrinsically Safe name plate is shown below for reference.
Note the following WARNINGS and REQUIREMENTS for YHC 4150X models
:
•
Substitution of components may impair Intrinsic Safety
•
To prevent ignition of flammable or explosive atmospheres;
¾
Disconnect power before servicing
¾
DO NOT
open the unit, including battery compartment, or attempt to service the unit
when located in flammable or potentially explosive atmosphere. Remove to safe area.
¾
DO NOT
mix old batteries with new or mix batteries from different manufacturers
¾
DO NOT
replace batteries while in explosive or hazardous atmospheres
¾
DO NOT
use any battery type other than those listed on the “Intrinsic Safe Control
Document” found in the Appendix of this manual.
WARNING: Serious injury or death may result from explosions. Do not connect the Communication /
AC Adapter Dongle to a YHC 4150X while in a hazardous area. This warning applies to the Dongle and
to both of the external connections to the Dongle – the AC Adapter and Serial Cable.
WARNING: Serious injury or death may result from explosions. Before making electrical connections to
an Intrinsically Safe YHC at the HART jacks, verify the HART instrument of interest is installed in
accordance with intrinsically safe field wiring practices.
Note: Restrictions apply to the use of Intrinsically Safe YHC units in hazardous areas. Refer to the
Intrinsic Safety Control Drawing in the Appendix of this manual for more information. Yokogawa
reserves the right to revise the Intrinsic Safety Control Drawing without notice. Contact Yokogawa
(phone 770.254.0400) for the current Intrinsic Safety Control Drawing.
For Intrinsically Safe YHC models, consult the Intrinsic Safety Control Drawing in the Appendix of this
manual for restrictions, for special instructions in use, and for electrical connections allowed.
