Sensor Electronics SEC Millenium Series Instruction And Operation Manual page 331

Reasonable broadcast times should be held to no longer than 2 seconds, that way
only one sensor gas detection interval is missed per scan loop (essentially, every other
sample, since the SEC 3000 sensor outputs a gas value every 1.65 seconds), worse case.
This is accomplished primarily by adjusting the number of records broadcast per gas
detection scan loop.
Example Scan Loop (100 gas detectors) with a Sliding Window (25 Records):
7 seconds
Gas Detector Loop 1:
ID 1 – 100 scanned again
7 seconds
Gas Detector Loop 2:
ID 1 - 100 scanned again
7 seconds
Gas Detector Loop 3:
ID 1 - 100 scanned again
7 seconds
Gas Detector Loop 4:
ID 1 - 100 scanned again
Example Scan Loop (100 gas Detectors) without a Sliding Window (100 records):
7 seconds
Gas Detector Loop 1:
ID 1 – 100 scanned again
7 seconds
Gas Detector Loop 2:
ID 1 - 100 scanned again
Sensor Electronics Corporation
5500 Lincoln Drive
Minneapolis, Minnesota 55436
nd
August 2 , 2006
Elapsed Time:
ID 1 – 25 Records output
7+1 = 8 secs
ID 26 – 50 Records output
8+7+1 = 16 secs
ID 51 – 75 Records output
16+7+1 = 24 secs
ID 76 – 100 Records output
24+7+1 = 32 secs
Elapsed Time:
ID 1 – 100 Records output
7+4 = 11 secs
ID 1 – 100 Records output
7+4 = 11 secs
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1 second
Sliding Window (1 of 4):
1 second
Sliding Window (2 of 4):
1 second
Sliding Window (3 of 4):
1 second
Sliding Window (4 of 4):
4 seconds
StatCast Output:
4 seconds
StatCast Output:
SEC 3500 OI- StatCast
RS232 Gas Status Text Broadcast
Configuration Manual
Revision 1.1