Hach 900 MAX manual Appendix B Graph Manipulation, Graphic Display Averaging, Sample History

Appendix B

Graph Manipulation

Table 23 Graphing Functions and Descriptions

Functions Description

Status Bar

Displays the time, date, measured value, and unit of measure at the intersection of the data cursor. Placing the cursor’s data on the status bar eliminates the need for X or Y axis labels and provides a larger graph viewing area.

Moving the Data Cursor with the Arrow Keys

The data cursor appears as a vertical line in the center of the graph. Move the data cursor to the left or right by using the soft keys or the numeric keypad.

Moving the Data Cursor with the Numeric Keypad

The keys 0–9 represent a percentage of full scale. Pressing a numeric key on the keypad while a graph is displayed causes the data cursor to jump to the location on the graph that is represented by that key.

For example, pressing the 0 key moves the data cursor to the far left end or 0% position on the graph. Pressing the 5 key moves the data cursor to the middle or 50% position of the graph. Pressing the 9 key moves the cursor to the 90% position.

Next Channel Soft Key

Graphs data from the next logged channel. For example, if the sampler is logging Level, Flow, and pH and the Level graph is currently displayed, the NEXT CHANNEL key causes the Flow channel to be graphed. Pressing Next Channel again will create a graph for pH channel. Pressing NEXT CHANNEL again returns to the Level graph, selects a time period of interest, and compares different graphs.

Graphic Display Averaging

The sampler can display a graph that consists of a maximum of 180 individual dots. Since a 24-hour period could contain as many as 1440 data points (assuming a one-minute recording interval, one reading each minute) it would be impossible to plot every data point on the graph.

	When more than three hours (more than 180 minutes worth) of data is
	graphed, the data points must be averaged. When graphing a partial day of
	three hours or less, all data points are graphed with no averaging.
	When viewing a graph with more than 180 data point, zoom in to the area of
	interest (using the Graph Partial Day option) before all of the individual data
	points are displayed.
Sample History
	Sample History displays a running history of the sampling program. Displays
	include sampler number, date and time of each sample, the bottle number it
	was put in, and the results of the sample cycle. Result messages include:
Message		Results
Success		Sample taken as expected.
No Liquid		No liquid was detected at the liquid sampler.
Key Press		A key was pressed twice during pumping, canceling that sample.

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8990apdx_pfeatures.fm	Programming Features