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Installation
Installation
2
2-1
Section 2
Installation
2.1 Installation
Installation of the monitoring system consists of selecting suitable mounting sites for each component of
the system, mounting each of the components, and connecting the components into the system
configuration.
Installation of this system is as follows:
Refer to the applicable drawings in Appendix C for
further installation Instructions.
Rack Chassis
The 876-1-55 Rack Chassis is a standard 19-inch chassis with a flame barrier. When seismic qualification
is required for the readout, seismic support brackets (P/N 876-1-114) are needed to support the rear of
the rack chassis. The brackets are designed to mount on the 19-inch qualified equipment rack.
Recommended mounting is shown on drawings GEL876-1-55, and 876-1-114.
Readout Module
Readout Module 876A-1 is designed to fit into one-half of an 876-1-55 Rack Chassis. Insert the readout
module in the rack chassis (see drawing GEL876A-1), then insert and tighten the two holding screws in
the rear flanges of the rack chassis. The pawl fastener on the front panel of the readout must be
tightened.
Optical Isolator (No longer manufactured, consult factory)
Detector
The detector case MUST BE PHYSICALLY
GROUNDED TO EARTH GROUND. The readout
instrument circuit common SHOULD NOT be
grounded to earth ground.
The 877-1 Detector is designed to mount on the containment wall. A mounting bracket attached to the
detector has four holes that are used for mounting. Studs must be placed in the containment wall before
mounting the detector. Dimensions for the studs are the same as the dimensions of the holes in the
mounting bracket (refer to drawing GEL877-1). Recommended studs are 5/16 inch Grade 5. No lock
washers are to be used and recommended torque for the nuts is 18 ft. lbs. Orient the detector so that the
cable connectors are on the underside. Attach the detector to the mounting bracket with the four clamps
provided, securing the bolts with a torque of 132 in. lbs. (Figure 1-5 and GEL877-1).
Pull Box
A cable pull box is required to allow for thermal expansion of the detector cables and to provide a service
loop. The pull box (drawing 878-12-5) is a typical type that mounts to the containment wall. It should be
mounted directly below the detector as shown in Figure 1-1. Depending on actual detector location, more
than one pull box may be necessary.
NOTE
NOTE