公开(公告)号：US5499512A

公开(公告)日：1996-03-19

申请号：US422690

申请日：1995-04-14

申请人： Romuald M. Jurewicz ,  Albert C. K. Wong ,  Verlon J. Wirth

发明人： Romuald M. Jurewicz ,  Albert C. K. Wong ,  Verlon J. Wirth

IPC分类号： G05D23/19 ,  G05D23/00

CPC分类号： G05D23/1905

摘要： Methods and apparatus for converting a refrigeration unit having a manually controlled thermostat to remote operation via a data logger, without replacing the manually controlled thermostat. A set point temperature selector associated with the thermostat is fixed at a predetermined value, and a resistance temperature detector (RTD), which is normally connected to a temperature input of the thermostat, is disconnected. A set point temperature for a space conditioned by the refrigeration unit is selected via the data logger. The data logger monitors the temperature of the conditioned space, compares the temperature of the conditioned space with the set point temperature selected via the data logger, and determines an operating mode for the refrigeration unit which will cause the temperature of the conditioned space to be maintained in a predetermined range relative to the set point temperature selected via the data logger. A potentiometer is connected between the data logger and the temperature input of the thermostat. The data logger adjusts the resistance of the potentiometer to correspond to a temperature of the RTD, which, relative to the predetermined set point temperature fixed on the set point temperature selector associated with the thermostat, will cause the thermostat to implement the operating mode determined by the data logger.

摘要翻译： 将具有手动控制的恒温器的制冷单元经由数据记录器转换成远程操作的方法和装置，而不需要更换手动控制的恒温器。 与恒温器相关联的设定点温度选择器固定在预定值，并且通常连接到恒温器的温度输入端的电阻温度检测器（RTD）被断开。 通过数据记录器选择由制冷单元调节的空间的设定点温度。 数据记录器监视调节空间的温度，将调节空间的温度与通过数据记录器选择的设定点温度进行比较，并确定制冷单元的操作模式，这将导致调节空间的温度得以保持 在相对于经由数据记录器选择的设定点温度的预定范围内。 在数据记录器和恒温器的温度输入端之间连接一个电位器。 数据记录器调节电位计的电阻，以对应于RTD的温度，RTD相对于固定在与恒温器相关联的设定点温度选择器上的预定设定点温度，将使恒温器实现由 数据记录器。