Why do the longer turnstiles have a higher throughput than the compact turnstiles?
Longer optical turnstiles (48″ – 60″ in length) have a higher realistic throughput capability than the compact turnstiles (8″ – 18″). The fastest card access systems on the market currently have a – second time delay from when the card is presented to when an access granted relay contact is generated. Some card access systems have as much as a 1-second delay. A person using a longer turnstile can present their card to a proximity card reader, pause slightly in their stride, keep moving and by the time they reach the sensing area, the card has been verified access granted. The turnstile is immediately ready for the next person. The entire sequence happens in about 2 seconds or less. If the same person using the same proximity reader were using a compact turnstile, they would be in the sensing area before the card access system could respond and grant access. An alarm would occur and the turnstile throughput would be stopped at that point. To prevent that alarm, the person would have to
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