Analyzer Start-Up - Ametek 5000 Instrument Manual

Analyzer Start-Up

Sample Switching Overview
Back pressure and flow rates for each sample point must be adjusted at initial analyzer
start-up. The following information is presented to assist the operator in determining
which sample point gas is flowing through the analyzer at any given time.The 5000
Multi-Point Controller has been factory configured to run the sample-switching routine
shown in Table II at start-up. Note that one complete cycle is always equal to the sample
measurement period plus the reference measurement period. Some 5000 systems use a
complete cycle of 60 seconds (30 seconds sample/30 seconds reference). For systems with
asymetric timing, refer to the values of Prg_Ref_Timer (ID# PR) and Prg_Meas_Timer
(ID# PM) found on the configuration data sheet supplied with the analyzer.
Event
>
Equilibration
Sample point 1 measurement
Equilibration
Sample point 2 measurement
Equilibration
Sample point 3 measurement
Equilibration
Sample point 4 measurement
REPEAT
Thus, the controller will switch sample streams in numerical order approximately every
240 seconds (4 minutes). In addition, the current sample point number is shown on
the first and second lines of the controller display. The number of complete cycles for
each event is fully programmable; refer to page 4-3: Timing for more information on
altering the timing variables.
Initial Flow Rate and Back Pressure Adjustments
!
CAUTION
1. Apply power to the controller and field unit. Boot up information will be displayed mo-
mentarily then the default normal operation screen (Figure 10) will be displayed.
2. Turn the adjusting screw counterclockwise to fully open the back pressure regulator control
(4). This is necessary to ensure that there is no pressure in the field unit when the sample
gas is first applied. Note the pressure indicated on the back pressure gauge (6).
3-6 5000 Multi Point Moisture Analyzer
Table II: Factory Default Sample Switching Routine
System Variable
EquilCycl_1
SamplCycl_1
EquilCycl_2
SamplCycl_2
EquilCycl_3
SamplCycl_3
EquilCycl_4
SamplCycl_4
Do not cap off or block the exhaust line; doing so will apply full line pressure across
the back pressure gauge and may permanently damage the gauge and possibly the
field unit. Ensure that analyzer exhaust is vented appropriately.
Default Value Typical Duration
(Cycles) (Seconds)
1
3 180
1
3 180
1
3 180
1
3 180
60
60
60
60