ATI Model F12/D Gas Transmitter Part 4 – Operation
39
O&M Manual (Rev-H)
Sensor Range Menu
Figure 45. Sensor Range Menu
Effect of the Range Setting on the Data Logger
The data-logger records readings as a fraction of the sensor range. If data-logging is turned on (as
indicated on the Main Display), changing the Range setting causes a warning message to appear prior to
saving the value. Select “Save” to save the new Range setting, or “Abort” to leave it unchanged.
Figure 46. Data-log Warning Message
Effect of Range on Auto-test
Gas generators used for Auto-test may not be compatible on all sensor ranges. If the Auto-test Status is
READY, scrolling to a higher Range may result in the following exception message, “Gas generator
incompatible on sensor's range.” To overcome this exception, change the Auto-test Status to
OFF, then set the desired range.
T90 is the approximate time required for the transmitter to reach 90% of its final value after a step change. The
values given in the table do not include gas flow time or the actual response time of the sensor.
Set the gas concentration value corresponding to the 20mA
output value. Changing this value also changes the Blank
(blanking) value, which is maintained as a fraction of the range. Setting
limits vary among sensors. Changing this setting invalidates
data stored in the data logger (see below), and may result in
an Auto-test exception message (also below).
Force the main reading to zero whenever the gas concentration
is below this setting. The limits vary from sensor to sensor, but
are typically 0 to 5% of Range. Note that the transmitter always
reports negative readings as 0 (except on calibration displays)
without regard to this setting.
The setting is recomputed when the Range setting changes, so
that the same fraction of range is maintained. Doubling, or
halving the Range setting, doubles or halves the Blanking
setting, respectively.
Helps to stabilize the gas sensor readings. It is a unit-less value
from 1 to 100 that controls a s/w lag filter. The setting has an
approximate effect on the T90
4
response time, as shown
►Range= 50.0PPM
Blank= 2.0PPM
” Changing this parameter will clear the datalog.”
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