PCM-2 Manual.pdf - Voss Associates

Other Optional Connections
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Eberline offers as options; a report printer, a remote status and alarm indicator,
and a variety of data interfaces to connect the PCM-2 to a host computer. Each
of these options is supplied with the required hardware, including cables, and with
specific installation information. As with the power cord, these cables may exit
through either power inlet plate; at the top of the unit or the lower rear corner of
the cabinet.
Configuration
After the instrument has been properly installed and purged with counting gas,
configuration with the correct operating parameters must be performed before it is
placed into service. Configuration is soft-set through the test mode edit routines
via keyboard input. The configuration routines and the parameters of interest
include at the minimum:
Edit Detector Parameters / Edit Override Parameters
NOTE: Detector parameters can be set for individual detectors using the
Edit Detector Parameter routine. The Edit Override Parameters is used to
set the same parameters for all 34 detectors globally.
Detector high voltage and efficiencies should be determined by calibration
routines before being set. The PCM-2 is fully calibrated at the factory
which is located at an elevation of 6,480 ft. above sea level. If the
instrument is installed at a different elevation it will be necessary to replateau
to determine the correct high voltage setting. Adjusting the high
voltage setting will necessitate measuring new efficiencies. Reference
Section 7 for detailed information on high voltage settings and detector
calibration.
RDA (Reliably Detectable Activity) levels should be set to the values
required by plant administration. RDA levels can be edited in Detector
Parameters, Override Parameters, or System Parameters.
Edit System Parameters
As noted above, RDA levels can be set for all channels in this screen. If
Mode 2 is being used, this parameter is RDA UPPER LIMIT. Default
values are 5,000 dpm for the beta channels and 900 dpm for the alpha
channels.
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PCM2.M/\N/ Rev /\//\pril 1995