Fluke 943-227-15 用户手册

3

3-1 

Installation consists of mounting the equipment, making the required electrical connections, and entering 
the desired set points.  
 

 

 

The preamplifier is a self-contained unit that is designed for mounting on a wall, or structurally sound 
surface, within 6 feet of the detector.  The preamplifier must be located in an area that is accessible for 
future maintenance.    
 

 

 
Electrical connections at the preamplifier include connecting the detector high voltage and signal coaxial 
cables and the field cable from the associated controller.   
 
The detector high voltage and signal cables enter the preamplifier through “Seal Grip” type penetrations 
on the enclosure body.  The “Seal Grips” contain a rubber gland that is intended to grip the coaxial cables 
to prevent moisture entry into the enclosure.  The “Seal Grips” are an integral part of the detector cables.  
The “Seal Grip” enclosure nut is removed from the fitting.  The insulating washer stay with the fitting.  The 
detector signal and high voltage cables, with connectors and “Seal Grip” fitting nuts are then inserted into 
the holes preamplifier enclosure.  The “Seal Grip: end fittings are then re-installed securely against the 
wall of the enclosure. 
 
The detector Signal (BNC) and High Voltage (SHV) cables are then terminated on the bulkhead 
connectors located on the enclosure inner panel.   
 
On the 943-227-15 or 943-227-15VL, the field cable is terminated on a “MS” type connector.  A mating 
“MS” style connector supplied with the detector.  It is not necessary to open the preamplifier enclosure to 
complete the interconnection to the associated controller.   
 
On the 943-227-15VL-M1, a 2.0-inch conduit hub is provided to interface with the field conduit system 
and cable.  The field conduit is connected to the preamplifier conduit hub and the field cable is routed 
through the conduit and into the preamplifier enclosure.  The field signal cable is then terminated on the 
terminal block in the enclosure.  Refer to the applicable wiring diagram or Table 3-1.  The high voltage 
coax cable is then terminated on the mating SHV connector.  Refer to Appendix D for further information.  
 
A desiccant bag is provided in the enclosure to absorb moisture.  The desiccant bags should be checked 
for moisture absorption prior to placing into service.  Each bag contains a color indicator stripe that turns 
red when it should be replaced.