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CT-7108     Supervised Contact Closure   Click for a larger image of Fiber Optic Contact closure
For critical contact Closure Monitoring Applications  

Block diagram of Supervised contact closure  

The Litelink  CT-7108 transmitter and CR-7008 receiver system transmits supervised status of eight separate contact closures over a single optical fiber conductor.

To close a contact, the voltage at the CT-7108 input must be within predetermined range. Any voltage that differs from the predetermined values will result in an open contact condition at both the transmitter and companion CR-7008 receiver. If the CT-7108 loses power or the fiber is cut the CR-7008 contacts will open and alarm condition will be indicated. 

All inputs are transient protected against excessive surges on the signal and power leads. Integral indicators are provided on both units to continuously indicate the link and contact closures status as well as proper operating power to simplify troubleshooting.

For unsupervised contact closure monitor see the CT/CR-7001 and CT/CR-7008.
 
 
Specifications Important Features
Number of Channels  Eight    · Eight Independent Contacts
    on One Fiber
Transmitter Input to close  2.91 and 3.70 DC volts  · Signal, Power & Link Indicators
Tx Input Impedance to Gnd  2 K Ohms ± 1%  · Multimode & Single-mode
      versions
Receiver Output  Relay Contact Closure   · Stand-alone, DIN or Rack
    Mountable (same unit)      
Output Contact switching A  0.5 A @ 125 VAC (6235VA)
 1.0 A @ 24 VDC		  
Output Contact carry current  2.0 A maximum  
Output Contact Resistance  100 milliohms maximum
Speed of Response  10 ms maximum  
Operating Wavelength 850, 1310 or 1550nm    
Optical Output Power  -15dBm (multimode),
 -15dBm (single-mode)		    
Optical Loss Budget  0-10 dB (multimode),
 0-12 dB (single-mode)		    
Optical Connectors ST (multimode)
FCPC (single-mode)
Signal Connector  Removable Terminal Block
Humidity <95% non-condensing
MTBF (per MIL HBK 217D) >120,000 hours
Power Requirements  11-24 VAC/DC @210 mA
Operating Temperature -35 to +75 degrees C
Physical Size (mm)  5.0"(127)H  x 1.0"(25.4)W
     x 7.0"(178)L		    

Note all specifications are subject to change without notice

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