Function description
Chapter 3 OPERATION MANUAL
V2.0.0en/09.06.16//15.09 Unistat®
3 Function description
3.1 Function description of the temperature control unit
3.1.1 General functions
Unistats are extremely dynamic temperature control units designed for both externally closed (see
page 34 in section »Connecting an externally closed application«), and also for externally open
applications (see page 34 in section »Connecting an externally open application (bath)«). Unlike
conventional bath and circulation thermostats however, these temperature control units have no
internal bath.
Instead of a tempering bath, which in conventional bath and circulation thermostats also intercepts
the expansion of the thermal fluid in dependence of temperature, there is here the temperature-
decoupled >Expansion vessel< [18], which usually maintains the expansion temperature of the
thermalfluid in the >Expansion vessel< [18] at almost room temperature.
Thanks to the low internal volume combined with efficient chilling/heating technology, you
achieve short cooling/heating rates compared to conventional bath and circulation thermostats.
3.1.2 Other functions
The speed-controlled pump, integrated into the table-top models and some free-standing models,
enables the speed or the pressure of the thermal fluid to be controlled and hence optimally
matched to the specified application. On free-standing models with higher pump and chilling capaci-
ties, this function can be performed by the external, optional VPC module.
The self-optimizing cascade control delivers optimal controller results for regulating levels up and
down, both with setpoint changes and also with exothermic reactions. Temperature control can be
either a-periodic or with a slight overshoot (faster).
The Ethernet, USB device and USB host interfaces supplied as standard with “Pilot ONE”, as well as
the Pt100, ECS and POKO interfaces at the “Unistat Control ONE” enable the temperature control
units to be seamlessly integrated into numerous automated laboratory systems.
The removable operating panel (“Pilot ONE”) can also be used as a remote control. If you require a
cable extension, please contact your dealer or the Sales Department at Peter Huber Kältemaschi-
nenbau AG. The telephone number for Huber Sales can be found on page 95 in section »Phone
number and company address«.
A connection jack for Pt100 process controller sensor enables you to accomplish external tempera-
ture control tasks with ease.
The temperature control unit is fitted with an integrated temperature ramp function and an inter-
nal temperature programmer. The integrated programmer offers the option of creating and re-
calling 10 different temperature control programs with a total of 100 program steps.
The temperature control unit has overtemperature protection to DIN EN 61010-2-010, independ-
ent of the control circuit itself.
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