Fluke Biomedical 875 Victoreen - Manual (Page 18)

Installation
Cable and Wiring Installation
2
2-3
NOTE
Minimum bend radius of the 878-1-9 cable is four
radius for P/N
878-12-30 is ¾ inch; stainless steel flex house is 12
ches.
.2 Cable and Wiring Installation
etector Cable I ide Containment
etector cables used inside c ccording to procedure
able-877, in Appe any moistu ts to depos nectors used
r installing cables l for ele e det s extremely
signals, no terminal block connec are acceptable in pene n. Signal conductor
ust be shielded but not grounded (qualified butt splices are acceptable). Refer to drawing GEL875-1 for
lectrical connectio and to 878-1-9 for cable .
UTION
The detector and readout must not be connect
during the following
st After Installation
les after installation is r d. A leakage test f the r conductor to the
hield should yield better than 1000 megohms at 1000 VDC.
tance of the center conductor is 0 hm per foot at 20° °F
etector Cable O side C ntainment
es used outside containment sho e a qualified coaxia pe R /U. Ideally, the cable
hould connect dire from e penetration to appropriate connectors on Readout Module 876A-1.
erminal block con tions and unshielded ce onductors are not epta r installation. Fluke
Biomedical recommends that cable 50-1 shown on drawing GEL 875-1. After
stallation, testing is required scribed in the previous paragraph. Specifications for cable used
utside containmen are liste Refer to drawing 50-103 for addi al da .
pecifications fo Cable
19/36 Tinned copper
Cross-linked polyethylene
Mica tape
Shield #36 AWG, 92% coverage
Insulation Wrap 0.001 inch (0.03 mm) mylar
Jacket Type Bostrad 7 (CSPE)
Thickness 0.015 inch (0.38 mm) nominal
Outer Diameter 0.217 inch (5.51 mm) nominal
Impedance 75 ohms nominal
Capacitance 22 pf/ft nominal
inches. When bending conduit or flex hose, take
this into consideration. Typical bend
in
2
D ns
D ontainment are to be installed and terminated a
C ndix B. Do
due to the potentia
not allow re or contaminan
ctrical leakage. Becaus
it on the con
ector transmit fo the
small current tions the tratio
m
e
ns data
CA
ed
test.
Detector Te
esting of detector T cab equire rom cente
s
Typical resis .022 o C (68 ).
D ut o
Detector cabl uld b l ty G 59
s ctly th the
T nec nter c acc ble fo
03 be used. Typical wiring is
in as de
o t d below. tion ta
S r 50-103
Type RG 59/U, alternate
Conductor
Insulation
Flame Tape