Temperature Measurement and Control
T
emperature measurement and auto-
matic bottle temperature control
can be added to any Series 3900 Shaker
Type Hydrogenator with a Parr 4833
Temperature Controller. This compact,
microprocessor-based controller will mea-
sure and control the bottle temperature
in the 20 – 80 °C range without a large
investment in automatic control equip-
ment, while providing several features
usually available only in more expensive
temperature control systems.
The 4833 Controller operates with a
Type J (iron-constantan) thermocouple in
a 1/8” diameter stainless steel probe held
in an A159CA Thermocouple Assembly
which carries both the probe and the gas
passage through a single opening in the
bottle stopper. Assemblies are provided
with thermocouples of different lengths to
fit various bottle sizes.
4833 Automatic Temperature Controller
The user can program the controller to
operate in either a simple ON/OFF mode
or in a more robust PID (Proportional-
Integral-Derivative) mode in which the
system evaluates and uses the time
dependency of the set point/process
temperature relationship to augment
the proportional action of the controller.
The controller can be instructed to auto-
matically tune the PID parameters to fit
the characteristics of the system. Dual,
four digit displays show the set point and
the bottle temperature. An illuminated
heater switch shows that power is being
applied to the heater. Overheating or a
break in the thermocouple circuit will
activate an alarm and shut off the heater.
Simply plugging the heater and
thermocouple cords into sockets on the
rear panel makes electrical connections
to the 4833 Controller. Heater loads up
to 3 amperes can be handled by a
built-in solid state relay. Units can be
furnished for either 115 or 230 volt opera-
tion, equipped with standard grounded
plugs and sockets, specifically for country
of destination.
Users who do not require the auto-
matic control features provided by a 4833
Controller can measure the bottle tem-
perature with any laboratory or industrial
temperature indicator suitable for use
with a Type J thermocouple, purchasing
only an A159CA bottle connector assem-
bly with an A295E thermocouple. Glass
thermometers cannot be used in these
hydrogenators as they are too fragile to
withstand the vigorous shaking action
of the bottle shaker.
Shaker Type Hydrogenation Apparatus
P a r r I n s t r u m e n t C o m p a n y
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