ATI Series D12 Toxic Gas Transmitter with H10 Smart Sensor
Revision N (7/15) 34
SENSORS and GENERATORS
Sensor Setup
As mentioned, the D12 transmitter accepts a wide variety of H10 Smart Sensors, which configure the
transmitter with the name of the gas, the full-scale range, units of concentration, blanking, damping,
alarm settings, and data to assist the transmitter with transforming the sensor’s output signal into a
representation of gas concentration. For this reason, it is imperative to make certain the sensor and
transmitter are properly configured for your particular application.
Sensor Setup Page
Figure 29. Sensor setup page
Table 4. Sensor variables
Range
The Range variable sets the 100% full-scale value of the transmitter, which
corresponds to the 20mA output value. Changing the range value also changes
the Blanking value, which is computed as a fraction of the range. In this version of
the transmitter, Range limits vary from sensor to sensor.
Damping
The Damping variable allows minor adjustment of the transmitter’s auto-damping
feature, used to stabilize readings. It is a unit-less value from 1 to 100, where a
value of 1 corresponds to a T90
2
response of approximately 20s, and 100 is a T90
of approximately 30s.
Blanking
The Blanking variable is used to force the main reading to zero, whenever the gas
concentration is below the programmed value. In this version of the transmitter,
Blanking limits vary from sensor to sensor, but are typically 0 to 5% of the full
scale range. Note that the transmitter always performs negative blanking, even
when Blanking is set to 0.
The variable is recomputed when the Range variable changes, so that same
fraction of range is maintained. Doubling, or halving the Range variable, doubles
or halves the Blanking variable, respectively.
More
More is a link to an additional sensor information page (below).
The data-logger records readings as a fraction of the sensor range. If data-logging is turned on
(indicated by “D” status indicator on the Main Display), changing the Range variable causes a warning
message to appear prior to saving the value. Select “Save” to save the
new Range variable, or “Abort” to leave it unchanged.
Figure 30. Data-log warning page
2
T90 is the time required for the transmitter to reach 90% of its final value, after a step change in gas concentration.
►Range = 50
Damping = 10
Blanking = 2.00
More
>Menu >Setup >Sensor
WARNING
Changing this pa
Data-log Warning Page
< Changing this parameter will clear the datalog.>
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