Ametek 241CE II User Manual

PN 903-8797, Rev A
Sub-Menu Item Description
RunType End-of-Run Type setpoint temperature (°C or °F) at which the Cooling Stage will terminate.
The parameters that can be displayed include:
• LowT = Low Temperature
• HCDP = Hydrocarbon Dewpoint Temperature
Regardless of the selection, the Cooling Stage will be terminated if the mirror temperature
reaches the LowT setpoint, or the analyzer is unable to achieve a lower temperature within a
2-minute period.
Cycle Fixed Time Cycle allows you to specify a xed cycle interval (minutes) for the Hydrocarbon
Dewpoint (HCDP) temperature measurement. This option must only be used in conjunction
with the End-of-Run Type for Hydrocarbon Dewpoint found.
Note:
The Fixed Cycle Time parameter is also available using the optional Modbus
®
communication (Register 1072); however, this parameter is not accessible using
System 200 Congurator Software communication. If your system uses the
optional Modbus communication function, refer to the 241CE II Analyzer Serial
Communication Interface (Modbus) Manual Supplement shipped with your
system.
To disable the function and use the analyzer’s default cycle settings, enter ‘0’ while viewing
this parameter.
To enable this function, enter a positive value (minimum ‘8’) while viewing this parameter. If
a positive value of less than ‘8’ is entered, the system will default to ‘8’ minutes (the xed time
cycle will begin at the start of the next cycle).
When the Fixed Time Cycle option is enabled, the mirror is cooled from the Mirror Start
temperature at a Fast Rate of 15 °C/minute until 2 °C above the last determined HCDP
temperature, or 2 °C above the lowest temperature attained if no HCDP is detected. At this
point, the mirror is cooled at a Slow Rate of 2 °C/minute until the HCDP is detected. Upon
exiting the Cooling Stage and entering the Warming Stage, the mirror is warmed at a rate of
15 °C/minute. As the mirror warms to 2°C above the last determined HCDP temperature or
the lowest temperature attained if no HCDP is detected, the Cell Purging Stage begins.
The duration of the Purging Stage is the time remaining until the next Cooling Stage is
scheduled to begin using the xed cycle time specied. Since the purge duration is variable,
the Purging/Hold-Stage-Time-Out warning (w Hold Timeout) may be raised frequently if the
temperature dierential between the mirror start temperature and the HCDP temperature
is substantial enough that the mirror does not have sucient time to reach the Mirror Start
temperature, or the analyzer is unable to stabilize the mirror to the Mirror Start temperature.
The one exception to the xed interval dewpoint determination cycle is the rst cycle upon
power up. Since the dewpoint temperature is unknown upon power up, the analyzer will
determine the dewpoint temperature in the rst cycle: Purge the Cell for the time specied,
cool the mirror at the Slow Rate specied, determine the HCDP temperature, warm the
Mirror to the start temperature, purge the Cell for the time specied, and stabilize the mirror
temperature at the Start Temperature. The xed cycle interval cycle applies when the next
cooling stage begins.
Note:
See “About the Measuring Cycle” in Chapter 2 for more information about
measuring cycle times and when to adjust the cycle duration.
User Interface | 3-15

Ametek 241CE II Specifications

General

Brand	Ametek
Model	241CE II
Category	Measuring Instruments
Language	English