JULABO LH 85 High Dynamic Temperature System - Manual (Page 5)

5
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
 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.
 The high pump capacity can be reduced by regulating the motor speed in five grades. It may thus
be adapted to sensitive vessels.
 The cooling unit may be cooled with air or water (automatic changeover).
 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.
 The digital RS232 / RS485 port permits modern process engineering without additional interface.
 The excess temperature protection (safety temperature), a safety feature functioning independent
of the regulator circuit, is adjusted and indicated via the VFD-Info-Display.
 The integrated programmer allows programming of setpoint and time values for six temperature
profiles.
 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.