GE Sievers 500 RL, Operation And Maintenance Manual, Page: 71 / 186

GE Analytical Instruments ©2010 71 of 226 DLM 74001-04 Rev. A
Chapter 4: Basic Analyzer Operation
2. Press the Reps button to set the number of replicate TOC measurements to be made on the sample.
When you press the button, a number pad displays. Enter a number and press the Enter button to save
the value, or press Cancel to retain the current setting without making any changes.
3. Press the Rejects button. This option determines how many of the replicate measurements will be
rejected in calculating average values and standard deviations. When you press the button, a number
pad displays. Enter a number and press the
Enter button to save the value, or press Cancel to retain the
current setting without making any changes.
In most cases, this first measurement will be close to the actual TOC but may be an outlier. It is best to set the
number of rejections to
1 or more to ensure an accurate TOC value. Using at least 4 repetitions allows rejection
of the first value and calculation of a standard deviation using the remaining values. If your Analyzer has a Super
iOS , the vial must be in Port 1.
When measuring in Grab mode, if you use glass vials the sample water must be acidified to a pH of 3. If you use
plastic vials, no acidification is required.
Managing Data History
The Analyzer stores the TOC measurement data history in the non-volatile memory. On the Data tab (see
Figure 12) you can configure the way your Analyzer stores and displays the data history; you also can initiate
printing and exporting of the data.
Figure 12: The Data Tab
Setting up Data History
The data history can accomodate approximately 33,000 entries (at least 90 days of usage).