Rosemount 890, Instruction Manual

Page: 40 / 96

I
NITIAL
S
TARTUP AND
C
ALIBRATION
Rosemount Analytical 748460-A January 2000
3-10
C
OMPONENT OF
I
NTEREST
UV methodology may be used for measuring a variety of components. Therefore, the
software allows the user to configure the display to reflect whatever component is being
measured. This component of interest is designated by a 3-digit group of letters or
numbers. This gas name or designation may be selected for each range by placing the
cursor under the desired digit [NNN] and selecting a letter or number with
↑
or
↓
key.
This name will appear on the display when the analyzer is in the RUN mode.
Note: Any designation other than the component of interest that was configured
to measure will have no effect on the analyzer's performance. It continues to
measure the configured COI.
G
AIN
In the [GAIN=X] display, an amplifier gain of 1, 2, 4, 8 or 16 can be selected for each
range with the
↑
or
↓
key depending on the sensitivity desired (Refer to Section
5.7). Range 3 is normally the least sensitive range.
Other ranges are generally set with gains that are proportional to their relative fullscale
spans. Thus, if range 1 is 0 to 50 ppm and range 3 is 0 to 500 ppm, then the
respective gains will usually be 8 and 1. If 5000 ppm is being measured, gain is x1
and the instrument is set for Low.
R
ANGE
, F
ULLSCALE
In the [FS=XXXX ppm *] or [FS=XX.X % *] display, up to a four digit fullscale value is
entered in ppm (parts per million).
Note: The instrument will not allow the user to enter a fullscale value in the
RANGE, FS screen [FS = XXXX ppm] that is less than the CAL GAS value
entered in the [CAL GAS = XXXX] screen. Conversely, the user cannot enter a
value in the [CAL GAS = XXXX] screen that is larger than the fullscale value
entered in the [FS = XXXX ppm) screen.
C
ALIBRATION
G
AS
In the [CAL GAS=XXXX ppm *] display, up to a four digit calibration gas value is
entered in ppm for each linearized range.
It is recommended that cal gas
concentration be from 75% to 100% of fullscale.
Z
ERO
O
FFSET
In the [ZR-OFFSET:X.XX *] display, the amount of zero offset in percent of fullscale is
entered for each range. The zero offset feature compensates for impurities in zero
calibration gas. If there are no impurities in the zero gas, set ZR-OFFSET to 0.00.
T
IME
C
ONSTANT
In the [TIME CONST=XX
←
] display, the value of the TIME CONSTANT can be
changed for each range. This TIME CONSTANT is responsible for the amount of time