Oldham OLCT 200, User Manual, Page: 44 / 80

OLCT 200 User Manual | 44
Eunits
(engineering units) may have up to a 10 character ASCII field. Many common
gases have pre-configured Eunits based upon the sensor type and each may be edited
in this menu as described in
Configuration Using the Magnetic Wand section 5-2.
Zero
(0%) defines the reading to be displayed when 4mA (0%) is the OLCT 200
output.
Span
(100%) defines the reading to be displayed when 20mA (100%) is the OLCT
200 output. The highest reading allowed is 9999 includes negative polarity sign and
one decimal point. Polarity is only indicated for negative readings.
Decimal Points
sets the resolution of the LCD readings and may be for 0, 1 or 2.
Example: ZERO readings for 0, 1 & 2 DP’s respectively are 0, 0.0 & 0.00.
Cal Span Value
sets what upscale value must be applied when performing Span
calibrations.
Readout Deadband
allows forcing low values to continue to read zero. This is
useful when there are small amounts of background gases that cause fluctuating
readouts above zero. The highest amount of deadband allowed is 5%. The 4-20mA
output is not affected by this menu item.
Track Negative
, set to NO, causes negative values to read the Zero (0%) value in
data displays. The CAL MODE readout displays negative values regardless of this
setting and negative values below the Fault set point will still cause the Fault alarm to
trip. The 4-20mA output always locks at 4mA when the reading is negative.
Linearization Data
allows nonlinear signals to be linearized by entering the
correct curve into the OLCT 200 (Figure 5-4). If Linearize is set for NO, the CURVE
POINTS menu data is not used and no linearization is applied. When YES, the
CURVE POINT entries are used and a straight-line approximation is calculated
between each of the 9 entries. 0% input always provides 0% output and 100% input
always provides 100% output. To prevent accidental data entry a special keystroke
sequence, of 4 consecutive UP keys, is required to enter this menu.
Figure 5-4: Linearization Menu
E n t e r K e y S e q u e n c e
t o a c c e s s me n u .
* * * *
N E X T k e y t o E x i t .
S e e Ma n u a l
L i n e a r i z e ? N O
D a t a P o i n t 1
% I n p u t 10 . 0 0
% Ou t p u t 10 . 0 0
PRESS
UP KEY
4-TIMES
C U R V E P OI N T S