Instruction Manual
D101402X012
3660 and 3661 Positioners
September 2015
43
NOTES:
1. THE INSTALLATION MUST BE IN ACCORDANCE WITH THE NATIONAL ELECTRIC CODE (NEC),
NFPA 70, ARTICLE 504 AND ANSI/ISA RP12.6 OR ARTICLE 505.
2. CLASS 1, DIV 2 APPLICATIONS MUST BE INSTALLED AS SPECIFIED IN NEC ARTICLE 501-4(B).
EQUIPMENT AND FIELD WIRING IS NON-INCENDIVE WHEN CONNECTED TO APPROVED
BARRIERS WITH ENTITY PARAMETERS.
3. LOOPS MUST BE CONNECTED ACCORDING TO THE BARRIER MANUFACTURE'S INSTRUCTIONS.
4. MAXIMUM SAFE AREA VOLTAGE SHOULD NOT EXCEED 250 Vrms.
5. RESISTANCE BETWEEN BARRIER GROUND AND EARTH GROUND MUST BE LESS THAN ONE OHM.
6. NORMAL OPERATING CONDITIONS 30 VDC 20 mADC.
3. FOR ENTITY INSTALLATION (I.S. AND NI):
Vmax > Voc or Vt Ci + Ccable < Ca,
Imax > Isc or It Li + Lcable < La.
Pi > Po, or Pt
Figure 28. FM Loop Schematic for Fisher 3661 Positioner (Drawing GE28590)
GE28590‐B
HAZARDOUS LOCATION NON-HAZARDOUS LOCATION
INTRINSIC SAFETY
CLASS I, II, III, DIV 1, GROUPS A,B,C,D,E,F,G
CLASS I ZONE 0 AEx ia IIC
NON-INCENDIVE
CLASS I, DIV 2, GROUPS A,B,C,D
FM APPROVED BARRIER
Vmax = 30 VDC
Imax = 150 mA
Ci = 0 nF
Li = 0 mH
Pi = 1.25 W
FISHER TYPE: 3661
FOR INTRINSICALLY SAFE APPLICATIONS: THE APPARATUS ENCLOSURE CONTAINS
ALUMINUM AND IS CONSIDERED TO CONSTITUTE A POTENTIAL RISK OF IGNTION BY
IMPACT AND FRICTION. AVOID IMPACT AND FRICTION DURING INSTALLATION AND USE TO
PREVENT RISK OF IGNTION.
WARNING
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