Lakeshore 336, User Manual

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8 c
HAPTER
1: Introduction
Model 336 Temperature Controller
1.3.2 Sensor Input
Configuration
1.3.3 Thermometry
Thermocouple
option
Model 3060
Sensor
Tempera-
ture Coeffi-
cient
Input Range Excitation
Current
Display
Resolution
Measurement
Resolution
Electronic
Accuracy
(at 25 °C)
Measurement Temperature
Coefficient
Electronic
Control
Stability
13
Thermocouple
3060 Positive ±50 mV NA 0.1 µV 0.4µV ±1 µV ±0.05%
of rdg
12
(0.1 µV + 0.001% of rdg)/°C ±0.8µV
13
Control stability of the electronics only, in ideal thermal system
TABLE 1-4 Thermocouple option input specifications
Capacitance
option
Model 3061
Sensor
Tempera-
ture Coeffi-
cient
Input Range Excitation
Current
Display
Resolution
Measurement
Resolution
Electronic
Accuracy
(at 25 °C)
Measurement Temperature
Coefficient
Electronic
Control
Stability 14
Capacitance
3061 Positive or
negative
0.1 nF to 15 nF 3.496 kHz 1 mA
square wave
0.1 pF 0.05 pF ±50 pF ±0.1%
of rdg
2.5 pF/°C 0.1 pF
1 nF to 150 nF 3.496 kHz 10 mA
square wave
1 pF 0.5 pF ±50 pF ±0.1%
of rdg
5 pF/°C 1 pF
14 Control stability of the electronics only, in ideal thermal system
TABLE 1-5 Capacitance option input specifications
Diode/RTD Thermocouple
Measurement
type
4-lead differential
2-lead differential, room
temperature compensated
Excitation
Constant current with
current reversal for RTDs
NA
Supported sensors
Diodes : Silicon, GaAlAs
RTDs : 100
)
Platinum (option), 1000 ) Plat-
inum, Germanium,
Carbon-Glass, Cernox™, and Rox™
Most thermocouple types
Standard curves
DT-470, DT-670, DT-500-D, DT-500-E1,
PT-100, PT-1000, RX-102A, RX-202A
Type E, Type K, Type T, AuFe
0.07% vs. Cr, AuFe 0.03% vs. CR
Input connector 6-pin DIN
Screw terminals in a ceramic
isothermal block
TABLE 1-6 Sensor input configuration
Number of inputs 4 (8 with Model 3062)
Input configuration Inputs can be configured from the front panel to accept any of the
supported input types. Thermocouple and capacitance inputs require
an optional input card that can be installed in the field.
Supported option cards Thermocouple (3060), capacitance (3061), or scanner (3062)
Option slots 1
Isolation Sensor inputs optically isolated from other circuits but not each other
A/D resolution 24-bit
Input accuracy Sensor dependent, refer to Input Specifications table
Measurement resolution Sensor dependent, refer to Input Specifications table
Maximum update rate 10 rdg/s on each input, 5 rdg/s when configured as 100 k
)
NTC RTD
with reversal on
Maximum update rate (scanner) The maximum update rate for a scanned input is 10 rdg/s distributed among
the enabled channels. Any channel configured as 100 k
)
RTD with reversal on
changes the update rate for the channel to 5 rdg/s
Autorange Automatically selects appropriate NTC RTD or PTC RTD range
User curves Room for 39 200-point CalCurves™ or user curves
SoftCal™ Improves accuracy of DT-470 diode to ±0.25 K from 30 K to 375 K; improves
accuracy of platinum RTDs to ±0.25 K from 70 K to 325 K; stored as user curves
Math Maximum and minimum
Filter Averages 2 to 64 input readings