User`s manual

8 cHAPTER 1: Introduction
Model 335 Temperature Controller
1.3.2 Sensor Input
Configuration
Sensor input configuration
Diode/RTD Thermocouple
Measurement type 4-lead differential
2-lead differential, room
temperature compensated
Excitation
Constant current with
cu
rrent reversal for RTDs
NA
Supported sensors
Diodes: Silicon, G
aAlAs
RTDs: 100 ) Platinum, 1000 ) Platinum
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
isotherma
l block
1.3.3 Thermometry
Number of inputs 2
Input configuration Inputs can be configured from the front
panel to accept any of the supported
input types. Thermocouple inputs require an optional input card that can be
installed in the field. Once installed, the thermocouple input can be selected from
the front panel like any other input type.
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
Autorange Automatically selects appropriate NT
C 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
1.3.4 Control
There are two control outputs.
1.3.4.1 Heater Outputs (Outputs 1 and 2)
Control type Closed loop digital PID with manual heater output or open loop;
warm up mode (Output 2 only)
Update rate 10/s
Tuning Autotune (one loop at a time), PID, PID zones
Control stability Sensor dependent, see Input Specifications table
PID control settings
Proportional (gain) 0 to 1000 with 0.1 setting resolution
Integral (reset) 1 to 1000 (1000/s) with 0.1 setting resolution
Derivative (rate) 1 to 200% with 1% resolution
Manual output 0 to 100% with 0.01% setting resolution
Zone control 10 temperature zones with P, I, D, manual heater out,
heater range, control channel, ramp rate
Setpoint ramping 0.1 K/min to 100 K/min
TABLE 1-4