Ch. 19. Air Temperature Controller Sec. 19.4. Operation
Heater Case This is a sensor mounted directly on the portion of the heater/ fan assembly containing the
heating coils. Typically used for diagnostic purposes in case of overheating.
Exit Air This sensor is mounted directly in the path of the outgoing air just inside the hole where the air
hose is connected to the ATC. Used for diagnostic purposes.
Head Temperature This sensor is located on the back of the Cypher Chassis about 1 inch above the
rear air vent in the enclosure floor. This sensor is used by the ATC as the primary feedback source. Its
location allows the sensor to be shielded from abrupt thermal changes when the door is opened.
Sensor 0 Input connection on the outside of the ATC unit. For auxiliary use.
Sensor 1 Second input connection on the outside of the ATC unit. For auxiliary use.
The ATC is shipped with 1 remote temperature sensor. This sensor can be used as the feedback sen-
sor or to simply monitor some specific place in your setup, or, as suggested above, to monitor room
temperature.
The ATC Case sensor is a reasonable second choice indicator of the lab temperature if you have are
using the auxiliary sensor (see
Step 4 on page 209) for another purpose.
19.4.4. Automatic Operation
After a few days of data logging you will have characterized the temperature swings in your laboratory
and will have chosen an ATC temperature setpoint which is a few degrees above the maximum daily
room temperature.
Tip
Your goal is to run the Cypher AFM as cool as possible since this minimizes
thermal shock to the instrument when the door is opened. Ideally you choose this
setpoint so that the ATC is producing heat at about the 5% level when the room
temperature is maximum.
Now is a good time to store the values of the ATC panel in the firmware of the ATC unit itself with the
following single step:
1. Under the ‘controls’ section of the ATC Panel, click on the ‘Save State as Default’ button.
Setting the ATC to automatic mode is also easy:
BETA
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