3
EMR4 Truck Installation
Installation of the EMR4 System involves installing the Display Head(s), the Interconnect Box, and any optional
devices (e.g., Remote Pulser, printer, etc.). This equipment must be installed according to the applicable
installation document. For UL/cUL installations use Control Drawing number 331940-021 and for ATEX
installations use Descriptive System Document number 331940-022. Figure 1 shows an example dual Display
Head installation.
Figure 1. Example EMR4 truck Installation With 2 Display Heads And Optional Remote Pulser
DC volt
a
ge from vehicle'
s
a
cce
ss
ory
circ
u
it -
a
t f
us
e
b
lock or ACC po
s
ition
of ignition
s
witch
Di
s
play Head 1
(Meter 1)
Meter 2
Remote Di
s
play Head 2
Top mount
Remote Pul
s
er
Front mount
Remote Pul
s
er
TRUCK CAB
OUT
S
IDE TRUCK CAB
D
a
t
a
(R
S
-4
8
5)
D
a
t
a
(R
S
-4
8
5)
Power
D
a
t
a
Power 12 Vdc
Power 12 Vdc
5 Vdc
P
u
l
s
e Inp
u
t
NON-HAZARDOUS
LOCATION
(R
S
-2
3
2)
Printer
Quick di
s
connect
fitting
s
(option
a
l)
Temp
Probe
EPSON TM-U295 SLIP
Cu
s
tomer
s
upplied wiring
The following inform
a
tion i
s
for gener
a
l reference
a
nd i
s
not
intended to repl
a
ce recommended N
a
tion
a
l Electric Code (NEC)
procedure
s
. It i
s
import
a
nt for the in
s
t
a
ller to under
s
t
a
nd th
a
t
wiring loc
a
ted in Cl
ass
I, Group D, Divi
s
ion 1
a
nd 2 in
s
t
a
ll
a
tion
s
,
or Cl
ass
I, Zone 0, Group IIA loc
a
tion
s
s
h
a
ll comply with the l
a
te
s
t
a
ppropri
a
te
a
rticle
s
found in the N
a
tion
a
l Electric Code (NFPA
70).
Check continuity
b
etween the Di
s
pl
a
y He
a
d ch
ass
i
s
a
nd the IB
ch
ass
i
s
through the vehicle fr
a
me. The re
s
i
s
t
a
nce mu
s
t
b
e no
more th
a
n 1 Ohm.
24 Vdc
Tr
u
ck gro
u
nd
M
a
x. c
ab
le length
35 ft. (10.6 m)
M
a
x. c
ab
le length
1000 ft. (304.8 m)
HAZARDOUS LOCATION
OR
I.S.
I.S.
I.S.
I.S.
I.S.
I.S.
NOTE: Intrin
s
ic
a
lly
sa
fe wiring
(m
a
rked )
s
h
a
ll
b
e in
s
t
a
lled
in
a
ccord
a
nce with Article 504 of
the NEC, AN
S
I/NFPA 70.
Intrin
s
ic
S
a
fety B
a
rrier
Interconnection
Box
12 AWG U.
S
. (4mm2 E.U.)
B
a
rrier Gro
u
nd
(
S
ee Notice 2)
Inp
u
t R
a
ting: 10-2
8
Vdc, 5 A
1.
See
Notice 2.
See
Notice 2.
2.
NOTICE
Interlock
S
witch
I.S.
E
SS
S
witch
I.S.