Ametek 682T-HP, User Manual

Page: 35 / 118

Chapter 3: Operation, Page 28
M o d e l 6 8 2 T - H P U S E R M A N U A L A T E X Z o n e 2
3.7 Trend
A trend of the sulfur and density results can be displayed by pressing the TREND button on the Main Screen.
The sulfur concentration is displayed as a solid trend line while the density is displayed as a dotted trend line.
The time period that is displayed is dependent on the Count Time to provide optimum detail.
If the Count Time is 59 seconds or less the Trend is updated every 5 seconds for the previous 5 minutes.
If the Count Time is between 59 and 121 seconds, the Trend is updated every 30 seconds for the previous 30
minutes.
If the Count Time is 121 seconds or more, the Trend is updated every 60 seconds for the previous 60 minutes.
The Trend is updated regardless of whether the analyzer is running or stopped. The vertical scale of the Trend
is the same as the scale set for the 4-20mA outputs for sulfur and density. The units are always % for sulfur and
gm/cc for density regardless of what units are selected for density on the Main Screen.
3.8 Verification Utility
The AMETEK ASOMA Model 682T-HP analyzer contains a utility for internal verification of the
measurement system. This utility may be used to verify that the detector and X-ray tube yield the same results
as when the system was last calibrated. The system achieves this by comparing the current measurements from
two internal standards measured through the empty flow cell with historical results under the same conditions.
The procedure is initiated by pushing the Capture button when the system is under Local control and the flow
cell is empty.
1.
Turn the Control switch on the door to the LOCAL position to stop any automatic analysis. Close the door
of the analyzer if it is not already closed. This will maintain thermal stability in the electronics during the
verification.
2.
Turn the Valve Switch on the door to the CLOSED position to prevent any accidental flow from the
process. If there are manual valves controlling flow to the analyzer, close these to prevent any accidental
flow from the process.