processing | Temperature control
Upgraded software for the Tempro basic C120 means that the system pressure is measured continuously and a maximum temperature limit is set automatically. If the operator should attempt to set the maximum tempera- ture higher than the calculated maximum temperature setting, the LED set value display flashes and issues a warning. This indicates that an increase of the set maximum temperature is not possible for safety reasons, as the water inlet pressure is too low. At the bottom of the scale, a minimum pressure of 1 bar is fixed in order to prevent cavitations inside the pump case. A second new software feature also serves to
Steam pressure curve illustrates the correlation of water inlet pressure and maximum operating temperature
Source: Wittmann
improve occupational safety. To ensure the safe opening of the magnetic valve, a fixed maximum differential pressure must not be exceeded. The temperature controller software is now programmed for pressure reduction at 6 bar in order to protect the functionality of the valve.
Graph compares energy consumption for 10-ton chillers with fixed-speed, digital scroll and variable-speed compressors at various load percentages Source: Conair
Need for speed With its new MC5 mould temperature controller, Matsui is highlighting the short time it takes to reach set temperature, with minimal overshoot. It cites a more powerful pump than on previous models and a more responsive thermocouple sensor. “It quickly and accurately reaches target temperatures within around 0.5°C of set point,” says Greg Lewis, general manager at Matsui America. By taking samples four times every second, the unit maintains optimum temperatures throughout production. The MC5 has a bigger control panel than its prede-
cessor and is equipped with more features as standard than other units. The valves are mounted outside the
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