IKA HBR 4 digital Operating Manual
Also see for HBR 4 control: Operating instructionsOperating instructionsOperating instructions
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19Control of medium temperatureOperation with external temperature sensor PT 1000.60/61 (only for HBR 4 control)Stirring functionThe desired medium temperature can be set between 0 and 200°C with the control knob (B), but not higher than the set safetytemperature. The value set can be read off on the digital display(C) (Fig. 12). The heating function is switched on and off by press-ing the button “Temp. On/Off” (F). If this function is activated thegreen LED next to the lettering “Temp” lights up. The heating bathis heated up to the set temperature. On the LCD display the settemperature, actual temperature and the PV symbol are displayed.The set temperature and actual temperature relate to the me-dium. During the heating phase the colour of the LED changesbetween green and yellow. If the yellow LED lights up this meansthat the heating system is being supplied with energy. If the heat-ing function is switched off using the sensor key and the mediumhas reached a temperature of above 50 °C the yellow LED flashes(20% on 80% off).On the LCD display °C and HOT are displayed alternately (Fig. 13and 14). The temperature of the heating element is limited by thesafety temperature set. The medium temperature is controlled bya fuzzy logic controller. The medium temperature is measured bya PT 500 temperature sensor and is heated up as quickly as pos-sible without overshooting to the set temperature. The fuzzy logiccontroller automatically adapts to the various heat capacities ofthe different heat transfer fluids. This guarantees an optimal tem-perature management without temperature drift and waviness.The supplied external temperature sensor PT 1000.60/61 can beused as a setpoint transmitter for controlling the temperature ofmedia, by using a vessel (e.g. glass flask) which is immersed in thewater or oil bath.The sensor tube must be of sufficient length to be immersed inthe medium to be tempered (at least 20 mm) and fixed in positionon the vessel.If the temperature sensor PT 1000.60/61 is connected tothe interface, the temperature regulation is automaticallycontrolled by the external sensor!The temperature sensor PT 1000.60/61 is not intended to act as atemperature sensor for the heating bath.If the sensor is immersed directly in the heating bath (which isconsidered misuse) and is at the bottom of the bath, control devia-tions of up to +/-4 K can occur.An error message (Er 5) will appear if the sensor value of the exter-nal sensor does not change within a certain period of time (adjust-able Error 5 response time 1 ... 30 min), e.g., because the sensor isnot immersed in the medium.This detection is activated only at differences > 5 K be-tween the sensor temperature and the target temperature,when the sensor temperature remains constant (+/- 0.5 K).Setting the response time of error 5:When “Er 5” appears on the display, press and hold the button“Mode” (D) and at the same time set the desired response time(1...30 min) by turning the control knob (B) .Note:0 min (zero) means the monitoring is switched off (OFF)!With the button ”Mode” (D) the correcting variable desired (setspeed) can be preselected. With the control knob (B) the desiredspeed of the stirrer drive can be set between 0 and 800 rpm insteps of 50 rpm. The value set can be read off on the digital display(C) (Fig. 15).The stirring function is switched on and off by pressing the but-ton “Motor On/Off” (E). If this function is activated the green LEDlights up next to the lettering “Mot.“ The motor runs gently up tothe speed set. On the LCD display the set speed, actual speed andthe PV symbol are displayed (Fig. 16).If both functions (heating and stirring) are switched off, the LCDdisplay always indicates the set temperature set. When the heatingfunction is switched on it is given priority on the LCD display.If the stirring function is started with the sensor key or called upusing the button ”Mode” (D), the system switches over to speeddisplay for five seconds. With the button ”Mode” (D) the LCD dis-play can be changed from temperature to speed and vice versaat any time. After five seconds the system switches back to thepredominant mode. |
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