Fluke Biomedical 875 Victoreen - Manual (Page 6)

General Information
General Description
1
1-1
Section 1
Introduction
ription
75
The 875 Containment Monitor has been qualified
for use in Nuclear Safety related applications.
Qualification Test Rep
950.310A define the
verified by test and ar
le for purchase.
, refer to Figure 1-1. It
sists of the 877-1 Ion Chamber Detector that is located within the reactor containment, and the 876A-
tained in a rack in the control room. The readout module contains a power
ssary power both for itself and the detector. The readout module is
onnected to the detector by two cables, a coaxial high voltage cable and a coaxial signal cable.
ations for the detector and readout modu elow.
.2 Specifications
Detector 877-1
ange
hamber Construction ng, 3
)
Withstand and Leakage @ 500 VDC between either ground and
1.1 General Desc
Containment Monitor 8
NOTE
orts, 950.301, 950.308A, and
parameters that have been
e availab
Containment Monitor 875 functions as an accident monitor for reactor containments
con
1 Readout Module that is con
supply that provides the nece
c
Specific
le are contained b
1
Radiation Detected
Photons above 60 keV
R 1 R/h to 1E7 R/h
Energy Response
± 20 % from 80 keV to 2 MeV
C Stacked parallel plate, 316 stainless steel housi
terminal, guarded ion chamber
Saturation > 80 % up to full scale on instrument
Collection Voltage 450 to 550 VDC
Current Output 7E-11 to 7E-4 Amp/R/Hr (nominal
hamber Capacitance C 435 picofarads (nominal)
Voltage 5E10-5 amperes
connector pins
C Approximately 430 pf apacitance