Selecting an Interval Timer. All Interval Timers are designed to display a sequence of time periods to be used for the guidance of repetitive activities such as occur in exercises or manufacturing. Chronomix Interval Timers are easily programmed devices which display the count in large bright numbers for many people to see.
A variety of models are provided to meet the preferences of different users. In addition to displaying customer specific programs, most units can also be configured by the customer to count up or down, silence the horn, show the time remaining in minutes, sets or intervals, or run time of day in 12 or 24 hour format. Some models are customized for more specific programs and the customer configurations may occasionally vary. The following concepts are critical to selecting the right model for your needs.
Displaying minutes and seconds or hours and minutes. Units which display minutes and seconds can accommodate a time for each interval from a minimum of 1 second up to a maximum of 99 minutes and 59 seconds. Models which display hours and minutes can accommodate a time for each interval from a minimum of 1 minute up to a maximum of 99 hours and 59 minutes. In either case a program can include up to 19 intervals and may also be designed to repeat some or all of the intervals. While it is apparent that the minutes and seconds models are by far the most popular, other operating modes are available.
Standard or Continuous Count. The basic interval timer will display every interval by beginning at zero and counting up to the end of the interval or by counting down from the interval time to zero. (A program of 3 periods of 15 seconds each will display 0 to 15, or 15 to 0, three times in a row.) Each interval is shown as a separate count. This is the most common method and there are certain benefits including more flexible programming and more clarity concerning the progress of the count through the program.
Another method, which we call “continuous count” will add up all the intervals and the display will show the entire program counting either up or down. (A program of 3 periods of 15 seconds each, will count from 45 to 0, or 0 to 45). This approach gives up some of the programming flexibility especially in the use of repeats. For certain applications where lights or the horn are used as alarm points this method may often be preferred.
Memory. A program may consist of a single period or a multitude of steps. Each time the start key is pressed the entire program will play unless interrupted. Three memory positions are available which accommodate the storage of three programs. Each program can be recalled instantly by the press of a button. Storing another program will overwrite the previous stored program.
Continuous Repeat. A continuous repeat command will set a program to run continuously until manually stopped.
Counters. Counters are a specific format of the interval timers that are designed to keep track of both target and actual production progress. The display shows both the number of completions targeted and the number completed. A takt time or cycle period is used to cause the target number to increase by one each time the cycle time expires. This allows the continuous comparison of the actual number against the planned target number. Depending on the rate of production the cycle time may be entered in time per part or in parts per hour, or parts per minute for faster rates. The required number of digits is determined based on the total that must be displayed for a shift or day period.