Owner's Manual

GDX-350 Sensor Transmitter
36 P/N: 5600-9001 Rev 2
Menu Item Description
Span (100%)
Defines the reading to be displayed when 20 mA (100%) is the GDX-350
output. The highest reading allowed is 9999. Included is a 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, and 2 DPs respectively are 0, 0.0, and 0.00.
Cal Span Value Sets which upscale value must be applied when performing Span calibrations.
Readout Deadband
Allows for forcing of 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 4-20 mA
output is not affected by this menu item.
Track Negative
(Default set to NO) Causes negative values to read the Zero (0%) value in
data displays
Linearization Data
. 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 4-20 mA output always locks at 4 mA when the
reading is negative.
Allows nonlinear signals to be linearized by entering the correct curve into the
GDX-350 (Figure 5-5
). 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.
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 O I N T S
Figure 5-5: Linearization Menu
Menu Item Description
Backup Config.
Allows users to store the entire, current GDX-350 menu database into non-
volatile memory for restoration later, in the case that incorrect values are
accidentally entered or uploaded.
Restore Config.
Restores the GDX-350 menu database to the values from the most recent
Backup Configuration. This menu item is only available if a smart sensor is not
installed. The special keystroke sequence of 4 consecutive UP keys is also
required to perform backup and restore operations.
Upload Sensor Data
Allows manual uploading of the entire smart sensor database to the GDX-350
from the smart sensor.
Cal Marker
Allows setting of the 4-20 mA
output value during ZERO and SPAN
calibrations at a level to prevent alarm trips by calibration values. Three-wire
models may be set from 0 to 20 mA.