Electronic refrigeration controller
April 2010
PLCs, DCSs & Controllers
ASStech’s German supplier, Jumo, has introduced a new electronic refrigeration controller for application in cold stores, freezer cabinets or cold displays. For connection to RTD probes, PtlOO, PtlOOO, KTY1X-6 or KTY2X-6, it is also available as a 2-channel microstat version with up to four relay outputs.
The first measurement input of the Jumo eTRON Ml00 controller is used to acquire the temperature of the cold store; the second input measures the evaporator temperature and ends the defrosting process as soon as the limit for defrosting has been reached. The measurements and up to eight parameters that can be enabled individually for the operating level, are shown on a three-character backlit display.
Three relays are available for the cooling unit, the defrosting heating and the fan. Alarms can be optionally generated via a relay or by means of the integrated buzzer. The switching states of the relays are indicated via yellow LEDs. Additional options for the controller (not the microstat) include a data-logger with adjustable recording intervals for compliance with HACCP monitoring of the cold chain requirements, an RS485 interface and real-time clock. Electrical connection is made via screw terminals.
Four keys serve for instrument operation and parameterisation. A setup program for the controller and a PC interface are available as accessories to enable simplified programming from the PC and for evaluating the data-logger.
For more information contact Anastas Schnippenkotter, ASSTech Process Electronics & Instrumentation, +27 (0)11 708 9200, [email protected], www.asstech.co.za
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