Lake Shore Model 321 Autotuning Temperature Controller User’s Manual
Installation
2-9
Table 2-2. Sensor Curves
Curve No.
Number of Lines
Range (K)
Abbreviation
Description
00
01
02
03
04
05
06
07
08
09
10
11
12
31
31
31
31
88
31
31
31
31
31
31
1 – 325
1 – 325
1 – 325
14 – 800
2 - 475
1.4 – 325
*
4 – 325
*
3 – 850
*
3 – 1272
* †
3 – 670
*
DRC D
DRC E1
DT-470
Plat.
DT-470
*
AuFe07%
AuFe03%
Type E
Type K
Type T
User
SoftCal
DT-500 DRC Curve D
DT-500 DRC Curve E1
DT-400 Series Sensors Curve 10
Platinum DIN Curve
DT-400 Series Sensors Curve 10
Reserved
AuFe 0.07% vs. Chromel
AuFe 0.03% vs. Chromel
Type E
Type K
Type T
User Curve or Precision Option
SoftCal™ Curve
*
Values are for thermocouples with compensation. Uncompensated, the thermocouple can use the full ±45 mV range.
†
Display reading is limited to 999.9 in K. For higher readings, change units to °C.
Sensor curves available with the Model 321 include D Curve, E1 Curve, Curve 10, Platinum Curve (DIN
43760), various thermocouple curves, and a factory installed Precision Calibration Option for a
calibrated sensor.
D and E1 Curve
. Users of older Lake Shore DT-500 Series Diode Sensors can still use the Model 321
when set to D-Curve (Domestic) or E1-Curve (Export).
Curve 10
. The Lake Shore DT-470 Series silicon diodes follow the same standard temperature
response Curve 10. Consequently, all of the sensors in this series can be routinely interchanged with
one another. Curve 10 is programmed into all Lake Shore Temperature Controllers, Digital
Thermometers, and Temperature Transmitters. DT-470 Series silicon diode sensors are offered in five
bands of tracking accuracy, enabling sensors to be selected on the basis of both technical performance
and budgetary requirements.
Platinum Curve
. Users of the Model 321-02 have the option of the standard platinum curve, or the
precision option. The standard platinum curve, which is detailed in Appendix C, conforms to
DIN 43760:1980; IEC 751:1983; and 1904:1984.
Thermocouple Curves
. The curve selected should match the type of thermocouple being used.
User Curve
. In addition to the standard curves, the Model 321 provides space for one user-defined
curve. Space for this user curve is provided as Curve Number 11 in the Model 321 (refer to Table 2-2).
This curve can be a custom curve developed by the Customer, a Precision Calibration Option Curve
purchased from Lake Shore (refer to Paragraph 2.9), or a curve purchased from another vendor. The
user defined curve can have up to 97 points plus two end points. The points can be loaded into the
controller using the serial interface, or if the Precision Calibration Option Curve is purchased from Lake
Shore, the curve can be entered at the factory. Chapter 4 of this manual describes user curve entry
using the serial interface.
SoftCal™ Curve
. If the SoftCal™ feature of the Model 321 is used, the resulting SoftCal™ curve is
stored in curve location number 12. Refer to Table 2-2 and Paragraph 3.2.6 to use SoftCal™.