Ametek Western Research IPS-4, User Manual

Page: 90 / 238

3-42 | IPS-4 Dual Bench (UV / IR) Analyzer
Setting Sample Response Time
Sample response time can also be used as a parameter for setting the
Aspirator Pressure . Response time is determined by switching the analyz-
er from Zero Gas Flush mode to Measure mode and recording the time it
takes the analyzer to display the first reading after the switch.
To check the sample response time:
1. Observe the output concentration from the HOME screen.
2. Press the
SETUP
soft key to display the SETUP menu and then press
the
DOWN
arrow key until the Calibration sub-menu item is displayed
and selected.
3. Manually zero the analyzer. To do this, press
ENTER
to display the
Calibration screen. Use the
DOWN
arrow key to select Start zero
calibration and press
ENTER
. The message “ Please wait ... ” will appear
while the analyzer initializes and performs the calibration function.
Run the manual zero for 10 minutes. For more information about set-
ting the Zero fluid flow rate, refer to “Adjusting the Zero/Span Fluid
Flow Rate” in this chapter.
4. From the Calibration screen, select Start measure and press
ENTER
to
return the analyzer to Measure mode.
5. Press the
HOME
soft key to return to the HOME screen and observe
the analyte output concentration(s) again.
If the sample response time is adequate (first response after a Zero is
less than 30 seconds to T90), no further adjustment is necessary.
The sample response time may vary, depending on Sample Line
length.

NOTE