Rice Lake Load Cells - Wiring for Hazardous Environments - Manual (Page 17)

14 Load Cell Wiring for Hazardous Environments
SCALE
TREA
TMENT
ANGLE 3 PLC 2 PLC TOL.
DECIMAL
DRAWING TOLERANCES
TITLE
SHEET OF
DWG NO
THIS DRAWING AND ALL INFORMA
TION CONT
AINED HEREIN IS AND REMAINS
THE PROPER
TY OF RICE LAKE WEIGHING SYSTEMS INC. AND IS CONFIDENTIAL.
IT IS SUBMITTED AND MA
Y BE USED ONL
Y IN CONNECTION WITH RICE LAKE
WEIGHING SYSTEMS' PROPOSAL AND/OR ITS CUSTOMERS' ORDERS. IT SHALL NOT BE DISCLOSED TO OTHERS OR COPIED WITHOUT RICE LAKE WEIGHING SYSTEMS' SPECIFIC WRITTEN CONSENT AND SHALL BE IMMEDIA
TEL
Y RETURNED UPON REQUEST
.
REVISION
REVISIONS
REV
REFERENCE
INIT
DA
TE
ALL THREADS TO BE CLASS 2
UNLESS OTHER
WISE SPECIFIED
ALL DIMENSIONS APPLICABLE AFTER TREA
TMENT
UNLESS OTHER
WISE SPECIFIED
DO NOT SCALE
DRAWING
SURF
ACE
FINISH
MA
TERIAL THIRD ANGLE PROJECTION
UNITS TO BE INCHES
FOR RL
WS
USE ONL
Y
RICE LAKE WEIGHING SYSTEMS
MFG.ENG.
DR.BY
APPROVED DES.ENG. APPROVED
CKD.
WIRING DIAGRAM -
LOAD CELLS IN HAZARDOUS AREAS
66020
1:1
16
--- --- ---
---
--- NONE
NEW
SLJ 9/15/00
0
9/15/00
NEW
1. DRAWING REVISIONS MUST BE APPROVED BY F
ACTOR
Y MUTUAL PRIOR TO RELEASE.
NOTE:
2. ELECTRICAL EQUIPMENT CONNECTED TO BARRIER INPUTS SHOULD NOT USE OR GENERA
TE MORE THAN 250 VOL
TS RMS.
3. MTL BARRIERS ARE MANUF
ACTURED IN ENGLAND:
REP
. IN USA: MTL INC. 8576 WELLINGTON ROAD, MANASSAS, V
A
. 22110.
4. R. ST
AHL BARRIERS ARE MANUF
ACTURED A
T 150A NEW BOSTON ST
., WOBURN MA. 01801.
5. RICE LAKE WEIGHING SYSTEMS MANUF
ACTURES JUNCTION BOXES AND BARRIER BOXES.
JUNCTION BOXES: EL604ST
A, EL604STR, EL604ET
A, EL210, EL211A, AND JB808.
BARRIER BOXES: BBX-XX SERIES. 6. SEE SHEET 6 FOR ENTITY FM APPROV
AL.
7. SEE SHEET 3, 4 AND 5 FOR SYSTEM OR LOOP FM APPROV
AL.
8. SEE SHEET 2 FOR NO BARRIER APPLICA
TION.
9. LOAD CELL MODEL NUMBERS COVERED BY THIS DRAWING:
RL70000B RL70000SS RL75223 RL8C2P1 RL39523 RLHTC
RL20953 RL30933 RL20000SS RL8C2P1SST
10. INST
ALLA
TION WIRING TO BE IN ACCORDANCE WITH ANSI/ISA RP12.6 "INST
ALLA
TION
RL30000B
OF INTRINSICALL
Y SAFE INSTRUMENTS SYSTEMS IN CLASS II HAZARDOUS LOCA
TION".
11. INST
ALLA
TION WIRING TO BE IN ACCORDANCE WITH ANSI/ISA RP12.6 "INST
ALLA
TION
OF INTRINSICALL
Y SAFE INSTRUMENTS SYSTEMS IN CLASS I HAZARDOUS LOCA
TION".
12. SINGLE LOAD CELL BARRIER SYSTEM IS SHOWN. ADDITIONAL LOAD CELLS CAN BE CONNECTED IN P
ARALLEL A
T THE JUNCTION BOX. WHEREVER EXCIT
AT
ION VOL
TAGE
PASSES THROUGH A BARRIER, THERE IS A SUBST
ANTIAL VOL
TAGE DROP TO THE
LOAD CELL. THIS VOL
TAGE DROP WILL INCREASE AS ADDITIONAL CELLS ARE ADDED
AND CONNECTED IN P
ARALLEL A
T THE JUNCTION BOX.
13. APP
ARA
TUS LOCA
TED IN THE HAZARDOUS AND THE ASSOCIA
TED APP
ARA
TUS IN THE
NON-HAZARDOUS LOCA
TIONS MUST HA
VE AN ENTITY APPROV
AL.
14. UP TO FOUR (4) LOAD CELLS (A
T 350 OHMS MIN. EACH) IN P
ARALLEL
(SEE NOTE 9 FOR APPROVED LOAD CELLS). 15. WHEN ALL BARRIERS ARE POSITIVE POTENTIAL, IT IS SUIT
ABLE FOR
GROUPS I.S./I,II,III/DIV 1/A-G. WHEN FIRST 3 BARRIERS ARE POSITIVE POTENTIAL AND THE REST ARE NEGA
TIVE POTENTIAL IT IS SUIT
ABLE
FOR GROUPS I.S./I,II,III/DIV 1/C-G. 16. Vt AND It OF THE BARRIERS MUST NOT EXCEED THOSE ST
ATED ON CHAR
T.
SLJ
DELETED DUPLICA
TE NOTES; RENUMBERED NOTES & ASSOCIA
TED TRIANGLES; DWG NO. W
AS 460256.
ECO10665: ADDED RL30000B; RL8C2P1SST W
AS RL8C2P1SS; MOVED ALL NOTES TO SHEET 1;