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The above example logger program...illustrates a real-world data logging and alarming application... programmed quickly and simply via the HyperWare software. In this application, the inlet and outlet temperatures in a process heat exchanger are to be monitored and logged... as well as the differential temperature across the exchanger. Additionally, if the temperature of the inlet temperature ever exceeds 220°F, an Alarm relay is to be energized and an alarm via telephone pager is to be sent. Following are descriptions of the functions of each of the icons employed within this program. A full complement of icons is available on the tool bar in HyperWare for use in building programs. |
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| Sample Rate Clock icon... sends an "update" command to the two Thermocouple Input hardware channels every second. This forces the two temperatures to be sampled every second. | |
| Two Thermocouple Input icons... represent actual hardware inputs into the logger. Double-clicking on these icons opens up a Configuration Dialog where the User can specify the type of thermocouple, temperature units, filtering, names, etc. They sample their inputs every time an Update command is received from the Sample Rate Clock icon... then pass the measured temperature value out to the connected Math icon and Delta icons. | |
| Delta icons... receive the temperature data from the Thermocouple icons and pass it through to the Memory icons if the value changes by a User defined amount ... since the last data was passed. This is an extremely powerful function and can, in many cases, result in accurate profiling of an analog signal... with a minimum amount of collected data. | |
| Data Memory icons... then receive the changed temperature data from the Delta icons and store the readings to memory within the data logger for later download. | |
| The Math icon... receives inlet and outlet temperature data every second from the Thermocouple input icons. In this application a simple subtraction function has been entered via the Math icon Setup Dialog. The resulting delta-T value is passed to another Delta icon, which in turn passes it to memory upon change. The Math icon has a powerful function library and in addition to basic algebraic math, can perform trig functions, logs, wind vector calculations and much more. Additionally, User-developed functions can be stored to a library for future use. | |
| The Comparator icon... compares two analog inputs and outputs an ON/OFF digital output when the top terminal input is greater than the bottom terminal input. In this case, the Comparator icon turns ON whenever the heat exchanger inlet temperature exceeds the Constant icon setting of 220°F, in turn activating a Page call-out and Alarm Relay. | |
| The Constant icon... represents a fixed number to be used in the program for set-point comparisons, calculation constants, and other purposes. In this case, it defines the alarm level for the Set-point Comparator icon | |
| The Pager Call-Out icon... when activated uses the logger modem to originate a call-out to a pager. In this case alerting staff to the over-temperature condition. | |
| The Relay Alarm icon... represents an actual hardware relay built into each HyperLogger, ModuLogger and Mini data logging system. The relay can be used to control an audible alarm or other function. | |
| And many more icons
including... |
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| Averaging icon | Time Integral icon | |||
| Periodic Output icon | Counter icon | |||
| Duty Cycle icon | Logic icons | |||

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