10
GA0383P02 Rev. C
Transit Time Calculations
Environment One will utilize information from the customer to develop a sampling system
transit time calculation. The main purpose for this analysis is to verify that the sampling
system will meet minimum system requirements for air flow through the sampling system
and to establish an expectation for the amount of time an overheat signal generated from
within the generator will take to reach the detector unit.
During a typical GCM-A system start-up and commissioning, a 100-watt resistor will be
overheated within the cooling circuit. When this is done, the transit time analysis will be
validated, as there should be a rough correlation between the transit time design
expectation and the actual interval between the resistor being overheated and a response
by the GCM-A.
Should the approximated transit time not be validated during the commissioning of the
system, air flow through the Zone Manifolds would be validated using an external DP gage
to verify proper flow rates and adjustments to flow would be made to meet system
requirements and customer expectations.
Summary of Contents for GCM-X
Page 40: ...39 GA0383P02 Rev C Figure 1 System Overview...
Page 41: ...40 GA0383P02 Rev C Figure 2 GCM A Outline...
Page 42: ...41 GA0383P02 Rev C Figure 3 GCM A Mounting...
Page 44: ...43 GA0383P02 Rev C Figure 5 Closed Circuit H Probe...
Page 45: ...44 GA0383P02 Rev C Figure 6 Closed Circuit U Probe...
Page 46: ...45 GA0383P02 Rev C Figure 7 Open Circuit Sample Heads...
Page 47: ...46 GA0383P02 Rev C Figure 8 Open Circuit Probes...
Page 48: ...47 GA0383P02 Rev C Figure 9 Sampling System 3 8 Typical PVC...
Page 49: ...48 GA0383P02 Rev C Figure 10 Sampling system 1 2 Typical PVC...
Page 50: ...49 GA0383P02 Rev C Figure 11 Sampling System 1 2 Flange Configuration...
Page 53: ...52 GA0383P02 Rev C Figure 14 Sample Probe...
Page 56: ...55 GA0383P02 Rev C Figure 17 Control Panel Detail...
