Temperature control
194
Goldeye G/CL Technical Manual V4.1.1
Special case: heating and cooling the sensor (G/CL-008 only)
Goldeye G/CL-008 models can actively heat up the sensor, enabling the TEC to
operate at a sensor temperature that is higher than the case or ambient
temperature.
When heating is enabled, the TEC does not need to switch down to a temperature
setpoint that is below the current setpoint. As long as the case temperature is
below the sensor temperature, the TEC keeps heating the sensor.
If required to keep the sensor temperature stable, the TEC automatically switches
from heating to cooling, or vice versa.
During operation, as long as the TEC does not actively cool the sensor, the sensor
temperature usually is higher than the case temperature. So, even if the sensor
temperature is below the current temperature setpoint, the TEC might still be
required to cool the sensor. The green arrow in Figure 63 shows this situation.
The ability to switch to a higher setpoint, however, depends on the feature
(
Reg
)
SensorTemperatureSetpointMode
:
•
set to
Auto
, the TEC is able to switch to a higher setpoint, if it exists, as shown
in Figure 63.
•
set to
Manual
, the TEC is not able to switch to any other setpoint.
Switching the sensor off
If the internal camera temperature exceeds a preset alert limit, the camera‘s
overheat protection circuit powers down the sensor board, however this includes
the sensor cooling.
The red color of the temperature status LED indicates the Alert state.
To control and regulate the internal camera temperature, several temperature
sensors are placed within the camera.
Figure 63: Schematic figure of TEC heating and cooling (Note for better
understanding the case temperature profile is shown in a simplified way that
covers the whole temperature range.)
0
10
20
30
40
50
60
Te
m
p
e
ra
tu
re
i
n
°
C
Time
Case temperature
Sensor temperature
Setpoint 1
Setpoint 2 (Default)
Setpoint 3
Setpoint 4
TEC switching point
