Temperature Calibration
The Dimension Icon EC chuck heater is rated up to 60°C at the sample. This requires the loop be set to about 67°C because Temperature Sensor B controls the temperature at the heater, which is hotter than the sample. The external Temperature Sensor A, shown in Figure 1, should be used to calibrate the difference between the control temperature (Sensor B) and the sample holder temperature (measured using Sensor A). It is advisable to create a chart plotting the PID setpoint temperature vs. the temperature in the sample holder. The temperature sensor is held down by a disk magnet when not in use.
Figure 1: The EC chuck, showing Temperature Sensor A
To calibrate the temperature difference:
- Place Sensor A over the top edge of the Teflon sample clamp and into the EC cell.
- Fill the EC cell with water.
- Ensure that the end of Sensor A is immersed in the water.
By setting different PID setpoint temperatures on the LakeShore Controller and letting it stabilize, you can see the temperature difference between the PID setpoint temperature (Sensor B) and the EC sample (sensor A). It is advisable to create a calibration chart, shown in Figure 2, by plotting the PID setpoint temperature vs. the temperature in the EC cell. This will allow you to set the PID setpoint temperature based on the desired EC cell sample temperature.
Figure 2: Electrochemical cell sensor calibration
The temperature projection is a typical use of the Linear Equ(ation) Math function. Express the correlation between the two temperature sensors by defining the EC Cell center temperature as a function of stage temperature. The function may be fit by a linear equation offline and its coefficients, M and B, entered into the LakeShore controller. Thereafter, the predicted center temperature, where the sample is located, may be displayed along with the stage temperature.
The LakeShore Temperature controller is limited to a maximum temperature setpoint of about 67°C, because temperatures over 60°C at the Dimension Icon EC cell may damage the High Efficiency Direct Drive TappingMode Cantilever Holder.
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loop be set to about 67°C because Temperature Sensor B controls the temperature at the heater, which is hotter than the sample. The external Temperature Sensor A, shown in Figure 1, should be used to calibrate the difference between the control temperature (Sensor B) and the sample holder temperature (measured using Sensor A). It is advisable to create a chart plotting the PID setpoint temperature vs. the temperature in the sample holder. The temperature sensor is held down by a disk magnet when not in use.