Lakeshore 330 User Manual page 80

Lake Shore Model 330 Autotuning Temperature Controller User's Manual
6.2.1 330-51 Option
The Model 330-51 is a special configuration of the Model 330-41 that allows temperature measurement and
control to 1000 °C with a Type K Thermocouple. The Channel A input is modified to read a sensor signal of
±45 mV instead of the normal ±15 mV. The larger input range lowers measurement resolution accordingly.
Below are typical specifications for the modified Channel A. Channel B operates normally and conforms to the
Platinum sensor specifications detailed in the Model 330 User's Manual.
CAUTION: The Model 330-51 has a special Type K Thermocouple curve loaded in location 11. Select
this curve for Channel A, instead of the standard curve at location 9. Failure to use the curve in
location 11 results in improper temperature or millivolts reading from the instrument causing the oven
heater to burn out.
Curves for other thermocouples can be downloaded with a computer interface. The curves must follow the
CURV Command format specified in this addendum, and not follow the format in the Model 330 User's
Manual. All thermocouple curves for this instrument are limited to ±45 mV and 1273 K. Use Type K to 1273 K,
but Type E is limited to 850 K and Type T to 670 K because of their higher sensitivities. (Only Type K curve is
included.)
CURV Command Format Changes : To change the thermocouple response signal in millivolts to a voltage
equivalent, add 45 mV and multiply by 100. For example, the response at 0 °C is 0.00000 mV and it loads as
4.50000 V. Temperature loads in K/2 because there are not enough digits in the temperature format to store
numbers larger than 999.9 K. The temperature at full scale, 1273 K, should be loaded as 636.5. The first three
characters of the description field must be S99, this sequence tells the Model 330 that it has a -51
configuration.
Model Number ....................................................... 330-51 *
Sensor Type........................................................... Thermocouple
Sensor Temperature Coefficient............................ Positive
Sensor Units .......................................................... Millivolts (mV)
Input Range ........................................................... ±45 mV
Sensor Excitation ................................................... N/A
Example Lake Shore Sensor ................................. Type K
Sensor Temperature Range .................................. 3 - 1273 K
Standard Sensor Curve ......................................... NIST generated
Typical Sensor Sensitivity ...................................... 40 µV/K at 300 K
Measurement Resolution:
Sensor Units .......................................................... 1.5 µV
Temperature Equivalence...................................... 37 mK at 300 K
Sensor Unit Display Resolution.............................. 2 µV
Measurement Accuracy ......................................... ±4 µV ±0.1% RDG
Temperature Accuracy with Calibrated
Sensor and 8001 Precision Option ........................ ±0.15K at 300 K †
Measurement Temp. Coefficient
Sensor Units (%RDG/°C)....................................... ±0.018%
Temperature Equivalence...................................... 40 mK/°C at 300 K
Setpoint Display Resolution in Sensor Units.......... 2 µV
*
Thermocouple data are for uncompensated input.
†
No Model 8001 Precision Calibration Option is available for thermocouples.
Error listed is for the controller only.
6-2
Model 330-51 Specifications
Options and Accessories