Revision 1 19 9/10/2019
2.5 Tape Transport System
The tape transport system is responsible for advancing the tape and ensuring that the
analyzer has a fresh section of white tape available at the commencement of every analysis
cycle. The tape transport system is shown in Figure 2-3.
Figure 2-3: Tape Transport System
The tape transport system consists of the supply and take-up reels, the drive motor, the
compression head, the pulse counter, and the optional low-tape sensor.
2.5.1 Supply and Take-up Reels
The supply and take-up reels are the key components in the tape transport system.
• The supply reel, which has a small screw-on retaining disk, is found on the bottom of the
chassis, and can hold reels of tape up to 350 feet in length. The tape is threaded over the
lower tape guide, past the sample chamber assembly and compression head, over the two
upper tape guides, and finally over the pulse counter pulley before reaching the take-up
reel.
• The take-up reel, which has a large screw-on retaining disk, is driven by the motor, and is
responsible for advancing the tape at the end of every cycle.
A small electric motor that is controlled by the main processor of the system turns the take-up
reel to advance the tape at the beginning of every analysis cycle to ensure that the next
analysis has a section of unreacted reagent to react with the phosgene.
The motor is either installed inside the chassis. The length of time that the motor runs is
controlled by the system processor in conjunction with the pulse counter.
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