Julabo Presto Plus LH 47, Руководство по эксплуатации

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Operating manual
1. Intended use
JULABO Temperature Systems have been designed for temperature application to specific fluids in a
external closed system (oop circuit). The units feature pump connections for temperature control of
external systems (loop circuit).
JULABO circulators are not suitable for direct temperature control of foods, semi-luxury
foods and tobacco, or pharmaceutical and medical products. Direct temperature control
means unprotected contact of the object with the bath medium (bath fluid).
1.1. Description
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Besides the cooling unit, the main functional elements are the heater, circulation pump and control
electronics. Via an external Pt100 control sensor, a self-optimizing, electronic proportional
temperature control (PID characteristic) adapts the heat supplied to the thermal requirements of
the external system.
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The high pump capacity can be reduced by regulating the motor speed in five grades. It may thus
be adapted to sensitive vessels.
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LH47: The cooling unit may be cooled with air.
LH50: The cooling unit may be cooled with water.
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Setting is rapid and simple using the splash-proof keypads. The operating elements consist of the
local operating board with a bright VFD-Info-Display, as well as the removable control module RD
connected with a cable.
The microprocessor technology allows four temperature values to be stored and indicated on the
DIALOG-DISPLAY (LCD) of the control module RD: working temperature, high and low
temperature warning limits as well as pump pressure stage.
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The digital RS232 / RS485 port permits modern process engineering without additional interface.
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The excess temperature protection (safety temperature), a safety feature functioning independent
of the regulator circuit, is adjusted and indicated via the VFD-Info-Display.
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The integrated programmer allows programming of setpoint and time values for six temperature
profiles.
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The following analog sockets are available:
- The REG+E-PROG socket for setpoint selection via an external, analog programmer.
At the same time, this socket provides three analog outputs for temperature recorders.
- The external Pt100 socket for external control.
- The alarm output for an external signal.
- The stand-by input for external emergency switch-off.
2. Operator responsibility – Safety instructions
The products of JULABO ensure safe operation when installed, operated, and maintained according
to common safety regulations. This section explains the potential dangers that may arise when
operating the circulator and also specifies the most important safety precautions to preclude these
dangers as far as possible.