Detcon DM-200 - Manual (Page 49)

TED S.
DM-200 Intrinsically Safe Installation Notes
1 1
4-15-04 0
2633 TITLE
DRN BY
FINISH
SCALE
SHEET OF
APPROVED BY
DWG #
DAT E
STATUS
3200 A-1 Research Forest Dr.
The Woodlands, TX 77381
MATERIAL STOCK #
REV #
detcon inc.
CONTROL
EQUIPMENT
DM-200 BARRIER
1 2 3 4 5 6
7
7 Loop +
Loop –
CONTROL
EQUIPMENT
DM-200-RS DM-200-RT BARRIER
1 2 3 4 5 6
7
7 Loop +
Loop –
Hazardous Area Safe Area
Class I, Group A, B, C and D;
Intrinsically safe wiring.
Control equipment must not use or generate more than 250 V with respect to earth.
Barriers must be installed in accordance with barrier manufacturer’s control drawing and article 504 of the
National Electrical Code ANSI/NFPA 70, CEC Part 1 or other local installation codes, as applicable.
Selected barriers must be third party approved as intrinsically safe for the application and have Voc not
exceeding Vmax and Isc not exceeding Imax of the intrinsically safe equipment, as shown in Table 1.
Cable capacitance plus intrinsically safe equipment capacitance must be less than the marked capacitance
(Ca) shown on any barrier used. The same applies for inductance. Capacitance and inductance of field wiring
from the intrinsically safe equipment to the barrier should be calculated as (Ccable - 60pF/ft and Lcable = 0.2
uH/ft) and should be included in the system calculations.
Barrier may be in Division 2 location is so approved.
DM-200 and DM-200-RT entity parameters:
Vmax = 30Vdc
Imax = 300mA
Ci = 30nF
Li = 0
Table 1:
I.S. Equipment
Barrier
Vmax ≥ Voc
Imax
≥
Isc
Ci + Ccable
ʺ
Ca
Li + Lcable
ʺ
La
7
6
5
4
3
2
1