Dynamic Range Switching - Thermo Scientific SOLA II Flare User Manual

Dynamic Range
Switching
Thermo Scientific

Low detector (carrier) flow

Low detector temperature

Lamp voltage change
 Low pyrolyzer temperature
 Low analytical oven temperature

Purge failure

Injection valve failure
During non-flaring times, the SOLA II Flare operates using the low
measurement range. When operating in the low measurement range, the
analyzer uses the low-range sample injection valve, which has a 100 μl sample
loop. When a flaring event with high sulfur content occurs, the first injection
using the 100 μl sample loop will most likely over-range the analyzer detector.
Therefore, an external trigger can be utilized to immediately switch the SOLA
II Flare to the high measurement range and prepare the analyzer for the
increased level of sulfur. The high range sample injection valve has a 1 μl
sample loop. Options for an external trigger include a flow meter, a pressure
transmitter, or the water seal level system. Once the analyzer is in the high
measurement range, the increased sulfur level will not over-range the analyzer
detector and the sulfur level can be tracked during the flaring event. If the
external trigger is not used, the SOLA II Flare recovers within five to seven
minutes and no external action is required to resume normal operation.
There is the possibility that a flaring event can occur where the overall sulfur
content does not increase. For these situations, there is a user-definable dwell
time associated with the external trigger. Once the external trigger tells the
analyzer to switch to the high range, the analyzer will monitor the sulfur level
for a programmed period, typically 5 to 10 minutes, to confirm that the sulfur
level is increasing. If the sulfur level does not increase at the end of the dwell
time, the SOLA II Flare will automatically switch back to the low measurement
range.
During the dwell time, the SOLA II Flare is in the high measurement range but
could be reading low sulfur number if the sulfur level is not increasing. During
this short period, the analyzer's accuracy will be poor but a sulfur number will
be reported.
Product Overview
SOLA II Flare User Manual
Chapter 1
1-4