3.7 Hydraulic circuit
The Integral T process thermostat is a powerful device for the temperature
control and circulation of heat transfer liquid with a very small active bath
volume. A thermally largely inactive part of the bath boiler serves as an
additional expansion volume.
Heating capacity and cooling capacity are matched to each other in order to
achieve rapid temperature changes in both heating and cooling operation.
The powerful pressure pump in the device ensures the necessary flow. The
pump always delivers the heat transfer liquid at maximum capacity. The com-
ponents of the external hydraulic circuit must be designed for this maximum
performance. In pressure-sensitive applications, the resulting pressure may
have to be limited via the bypass.
In the event of a fault, large quantities of heat transfer liquid can flow back
into the device from the external circuit. In order not to flood the appliance,
the bath boiler has an overflow pipe.
In the heating-up area the pump works up to a kinematic viscosity of
200 mm²/s. 50 mm²/s should not be exceeded during regular operation.
Optimum temperature control is under 30 mm²/s.
With the IN 1030 T, IN 1330 TW and IN 1830 TW devices, an additional
pump is used to circulate the internal bath volume.
Fig. 12: Schematic of hydraulic circuit
The hydraulic circuit in the device consists of the following components:
n
Bath boiler with expansion volume
n
Level sensor
n
Pump
n
Bypass
n
Heating
n
Evaporator
The hydraulic circuit in the Integral XT consists of a piping system through
which the heat transfer liquid flows under pressure.
Hydraulic circuit in Integral T
Hydraulic circuit in Integral XT
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Integral Process Thermostats and High-Temperature Thermostats
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