TR-2 Thermoelectric Temperature Regulator
TR-2 Thermoelectric Temperature Regulator
1
TR-2 Thermoelectric Temperature Regulator
The S2000 Miniature Fiber Optic Spectrometer is available with the
TR-2 Thermoelectric Temperature Regulator, a device that stabilizes
the temperature of the optical bench, optics and CCD array in each of
up to six spectrometer channels. Over a 24-hour period, the TR-2
controls the temperature of the optical bench to +/- 0.1
°
C, with
baseline and spectral stability to +/-0.001 Absorbance Units.
You can read the current temperature of the S2000 spectrometer and
set and store into memory the desired temperature for the S2000
(called the set-point temperature). The LED on the front of the TR-2
displays the current system status:
•
If the LED is green, the temperature of the S2000 is within
±
0.1
o
C of the stored set-point temperature.
•
If the LED is continuously red, the temperature of the S2000 is not yet at the stored set-point temperature.
•
If the LED is blinking red, then there is a system malfunction.
The TR-2 is a demand-based temperature regulator. When the semiconductor sensor indicates the temperature
has drifted from the set-point temperature more than 0.1
o
C, the unit transmits pulses of current to the
thermoelectric element in the correct direction (heat or cool). A series resistor limits current through the
thermoelectric element to its specified maximum. The indicator light turns red when deviation from the set-point
temperature exceeds 0.2
o
C.
The TR-2 achieves temperature stability 15
°
C below the ambient temperature. For example, if the ambient
temperature is 25
°
C, then the minimum stable temperature that the S2000 could achieve with the TR-2 would be
approximately 10
°
C. No matter what the ambient temperature is, the maximum stable temperature that the
S2000 can achieve with the TR-2 is 37
°
C.
Operation Notes
1. When large changes of temperature are required, it may take up to 24 hours for the S2000 to achieve the
set-point temperature.
2. The temperature sensitivity of the S2000 is typically
±
0.05 pixels/
o
C. If the application requires <1 pixel
precision, then the spectrometer wavelength calibration procedure should be performed at the set-point
temperature.
3. If there is a system malfunction with the TR-2, the system will not be operable and the LED will turn red
and flash at 1-second intervals. When a system malfunction occurs, you can “reset” the TR-2 by
depressing the set-point temperature button. The following actions will result in a system malfunction:
•
If the cooling fan fails
•
If the temperature exceeds 37
o
C
•
If you connect the A/D interface cable to the S2000 before connecting the power supply (see
Using the Correct Power-Up Sequence)
