SSi Manual 4559
Page 18 of 26
3-Gas Analyzer PGA3500
Revision Level - D
with an instrument that can provide real-time temperature data. The purpose of this function
is to prevent the instrument from pulling a bad sample, which could potentially damage the
sensors. The minimum temperature should always be slightly higher than the lowest possible
process temperature. The range of values for the Minimum Temp is 0 to 2000.
The Minimum mV is the millivolt set point that will stop the COF/PF adjustment. This will
prevent adjustments from being made when the proper conditions are not met. The minimum
millivolts set point should be slightly higher than the minimum millivoltage that is expected.
The range of values for the Minimum mV is 0 to 2000.
The Maximum Adjustment is the largest increment of change that will be applied to automatic
COF/PF adjustments. This will dictate the size of the steps the instrument takes when it
adjusts the COF or PF of the control instrument. A higher value will result in more speed in
achieving the desired set point, but a lower value will result in a smoother approach. The
Maximum Adjustment feature should be coordinated with the Update Interval time to achieve
the desired responsiveness. The range of values for the Maximum Adjustment is 0 to 20.
The Maximum COF/PF establishes the upper allowable limit for the COF/PF. For example, if
this is set to 300, then the instrument will make changes to the COF/PF until it is at 300, but
it will not go any higher. The value will range from 0 to 999.
The Minimum COF/PF establishes the lower allowable limit for the COF/PF. For example, if
this is set to 100, then the instrument will make changes to the COF/PF until it is at 100, but
it will not go any lower. The value will range from 0 to 999
.
The IR Mode is a selection to determine if the instrument is running in Automatic or Manual
mode. When in Monitor mode, no changes will be made to the COF/PF of the control
instrument. There are two Automatic modes to select from. COF/PF Adj. %C will make
adjustments to the COF/PF in the atmosphere controller based on the calculated percent
carbon. This is the preferred method of adjustment. The other Automatic mode, COF/PF
adj. CO, will make adjustments based only on the measured level of CO and not on the
carbon calculation. The three options are:
Monitor
COF/PF Adj. %C
COF/PF adj. CO
To cycle between each selection, press the circular arrow key or enter the number that
corresponds to the option’s position in the list and press Enter, where Monitor is at position 0
and COF/PF adj. CO is at position 2.
The On Delay determines the amount of time it takes for the pump to turn on after both of
the operating parameters (temperature and millivolts) have been met. The value will range
from 0 to 60 minutes.
The Off Delay determines the amount of time it takes for the pump to turn off after either of
the operating parameters (temperature and millivolts) falls outside of the pre-defined
boundaries. The value will range from 0 to 60 minutes.
The Update Interval determines the amount of time between automatic updates of the
COF/PF on the control instrument. This is adjustable in one-minute increments. It is
recommended that the Update Interval be set to one (1) minute, and the Maximum
Adjustment set to one (1) point. This will allow the COF/PF to be adjusted frequently, but
only a small amount at a time, which will result in smooth operation. The value will range
from 0 to 20.
The Sample Delay determines the amount of time the PGA will wait to continue to adjustment
of the COF or the PF once the pump has turned on. The range of values is 0 to 30.
Example – The following will show how to set up the sampling parameters of:
Minimum Temp – 1500