Parr Instrument 4857 - Manual (Page 9)

4857 Reactor Controllers
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M
ODEL
4857 P
ROCESS
C
ONTROLLER
S
PECIFICATIONS
Temperature Control Parameters
To facilitate start up with reasonably
good PID control parameters for heating
and cooling, all 4857 Process
Controllers are programmed at the
factory with the temperature control
settings shown on the right.
Output 1 on these controllers drives the
heater. Output 2 can be used to
activate a cooling system. Control
parameters can be set independently for
each of these outputs.
Module 1: Temperature Control
Cycle time 2 seconds
Proportional Band 25
°C
Integral Time 5 min
Derivative Time 25 sec
Input thermocouple Type J
Operating range 0 to 800
°C
Display resolution .1
°C
Setpoint resolution .1
°C
System accuracy +/- 0.1% FS
+/- 1°C typical
Control action Three term PID control
plus limit control
Control output 1 15 amp @ 115V,
15 amp @ 230V
Control output 2 0.25 amp
Operating voltages 115 and 230 VAC
Maximum switching
load 15 amp @ 115 VAC
15 amp @ 230 VAC