Temperature Control Solutions - Labo Plus

Technical Information | Glossary
Glossary
Positive Displacement Pump
Available on select PolyScience Recirculating Chillers,
this type of pump generates moderate flow at high
pressure. It is best suited for situations where greater
head pressure is needed, such as applications where the
cooling fluid must be pumped some distance or where
in-line pressure is required to activate flow devices.
Pump Pressure
The force of fluid being pumped. The higher the
pressure, the greater the distance that the fluid can
travel. Lower pressure is better for fragile fluid paths,
such as glass tubing. It is measured using water at a
flow rate of 0 gpm (0.0 l/min) at the outlet port of
the unit.
Recirculating Chiller
Interchangeable with Recirculator and Chiller:
See “Chiller/Recirculating Chiller.”
Recirculating Cooler/Heat Exchanger
A closed-loop, non-refrigerated system designed to
cool an external device. Cooling is provided by
transferring heat from the external device to either the
air (Liquid-to-Air Coolers) or to facility cooling water
(Liquid-to-Liquid Coolers).
Refrigerant
A compound used in a refrigeration unit to extract heat
from a process or internal reservoir. All PolyScience
Chillers and Refrigerated Circulators use CFC-free
refrigerants.
Refrigerated/Heated Circulating Bath
A bath with an integral pump, heater, refrigeration
system, and temperature controller. In addition to
low temperature applications, Refrigerated/Heated
Circulating Baths offer more precise control for
applications that require bath temperatures near or
below ambient. All PolyScience Circulating Baths
provide internal circulation as well as external
circulation capability.
Reservoir Capacity/Bath Volume
This specification provides information on how much
liquid the Circulator, Water Bath, or Tank will hold when
filled to maximum capacity. It does not include the
volume of liquid in external tubing or equipment.
118 | Phone: 800-229-7569 • +1-847-647-0611
Simplex Pump
A type of pump that provides pressure flow only, thus
limiting its use to closed-loop applications. PolyScience
Circulating Baths with Standard Digital and MX
Temperature Controllers are equipped with Simplex
pumps.
SmartTouch Display
An advanced, full-color touch screen display. Featured
on PolyScience Performance Programmable, Advanced
Programmable, and Performance Digital Temperature
Controllers.
Specific Heat
This is a measure of a fluid’s heat capacity (the amount
of heat per unit mass required to raise its temperature
by 1°). The specific heat of water is 1 BTU/lb °F (4.19 KJ/
kg K). PolyScience Circulators with Performance and
Advanced Series Temperature Controllers can be tuned
for use with specific fluids to enhance performance and
temperature control.
Suction Pressure
This is the pressure generated by the pump at the fluid
intake of a Circulator equipped with a Duplex (pressure/
suction) pump. It is measured using water at a flow rate
of 0 gpm (0.0 l/min).
Swivel 180 Rotating Controller
A (patent-pending) PolyScience exclusive that allows
independent positioning of the Circulating Bath
Temperature Controller, thus allowing the operator
to keep the temperature display in sight anywhere
within a 180° viewing radius. Swivel 180 is standard
on all Performance, Advanced, and Standard
Temperature Controllers.
Temperature Accuracy
This represents how well the instrument’s measured
temperature value corresponds to that of a calibrated
standard. For example, the displayed bath temperature
in a Circulating Bath with a set-point of 25.00°C and
a temperature accuracy of ±0.25°C may actually be
as low as 24.75°C or as high as 25.25°C. PolyScience
Circulators, Digital Water Baths, and Chillers feature a
calibration offset that allows the operator to match the
displayed temperature to that of an external device or
calibrated temperature standard.