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Hangzhou Linuo Machinery Equipment Co., Ltd.
Hangzhou linuo machinery equipment co. LTD
Use and adjustment method of refrigeration system pressure controller
)的自由端产生位移，通过链接导杆推动开关内碟片瞬时发生移动；当压力降至额定的恢复值时，碟片瞬时反向移动，开关自动复位，最终输出一个 开关量 的电信号。 When the pressure in the system is higher than a certain set pressure, the free ends of different pressure-sensing elements (spring tube, diaphragm, diaphragm, bellows, piston, etc. ) are displaced, and the disc inside the switch is pushed by the link guide for a moment. Movement occurs; when the pressure drops to the rated recovery value, the disc moves in the reverse direction instantaneously, the switch is automatically reset, and finally an electrical signal of a switching value is output .
Terms and definitions:
pressure switch： 当输入压力达到设定值时，通过输出触头的通断作用起到对被控压力的控制和报警作用的仪表。 Pressure switch: When the input pressure reaches the set value, it is an instrument that controls and alarms the controlled pressure through the on-off function of the output contact.
range： 控制器能够控制的压力范围。 Pressure control range: The pressure range that the controller can control.
set point： 希望发生控制或报警的输入压力值。 Set point (value) : Set the input pressure value for which control or alarm is desired.
位式控制仪表上行程（或下行程）中，输出从一种状态换到另一种状态时所测得的输入值。 Switching value: The input value measured when the output is switched from one state to another in the upward stroke (or lower stroke) of the position control instrument.
high-switching value： 输入压力上升时，使控制器产生控制或报警信号发生变化时的压力值。 High-switching value: When the input pressure rises, the controller generates a pressure value when the control or alarm signal changes.
low-switching value： 输入压力下降时，使控制器产生控制或报警信号发生变化时的压力值。 Low-switching value: When the input pressure drops, the controller generates a pressure value when the control or alarm signal changes.
differential gap： 同一设定点上切换值和下切换值之差。 Differential gap: The difference between the switching value and the lower switching value at the same set point.
set point error： 输出变量按规定的要求输出时，设定值与测得的实际值之差。 Set point error: The difference between the set value and the measured actual value when the output variable is output as specified.
(值)范围set point range： 设定点可调的控制器，设定点可以调节的最大压力值与最小压力值之差。 Set point range: The controller with adjustable set point, the difference between the maximum pressure value and the minimum pressure value that can be adjusted by the set point.
DIFF is the pressure difference, which refers to the switching difference. It is often called "connection difference" and "dead zone" in use; it refers to the difference between the set value of the switch and the reset value. For example, when the set value is 1MPa, the actual When the reset value is 0.9MPa, the disconnection difference is 0.1MPa. Refrigeration Encyclopedia reminds you that every pressure switch has this parameter, but the dead zone of some pressure switches is adjustable, and the dead zone of some pressure switches is not adjustable. 切换值是上切换值还是下切换值 ，对于切换差可调的压力控制器是否上下切换值需要同时满足要求。 When debugging a pressure controller, you first need to know whether the switching value you are using is an upper or lower switching value . For a pressure controller with adjustable switching difference, whether the upper or lower switching value needs to meet the requirements at the same time. Simply put, it is necessary to act when the pressure rises or to act when the pressure drops, or both.
切换值刻度窗口和切换差刻度窗口 ，但这类控制器的刻度窗口只能做为大致观测使用， 切记不能作为调整设定点的标准和依据 。 Many types of controllers have a switching value scale window and a switching difference scale window . However, the scale window of this type of controller can only be used for approximate observation. Remember that it cannot be used as a standard and basis for adjusting the set point . “ 凭感觉 ”或是“看刻度”自行调整，结果导致切换值严重偏离所需的设定值。 Therefore, Refrigeration Encyclopedia reminds you that the adjustment of the pressure controller must be adjusted by a qualified laboratory. Many people feedback information, and they feel that the switching value is low or high. In the absence of a standard device, " by feeling " or " "See the scale" to adjust it by yourself. As a result, the switching value deviates significantly from the required setting value.
How to adjust the set value up
0.05～2.5）MPa的控制器,要求上限切换值为2.0MPa。 The controller with a setting range of ( 0.05 ～ 2.5) MPa is selected, and the required upper limit switching value is 2.0 MPa.
1. Loosen the lock and screw the controller into the threaded interface of the calibration table; open the cover, pass the cable through the cable interface to the terminal board, and connect the other end of the cable to the multimeter;
2. Pressurize to 2.0MPa, this value can be read by standard pressure gauge; turn the setting value adjustment lever clockwise to make the setting value change from large to small, until the micro switch is switched at 2.0MPa.
3. Rotate the lock to adjust the pressure of the calibration table so that it changes back and forth between 2.0 MPa. When the calibration pressure rises, the switching value is 2.0 MPa. This value is the required upper switching value. The value minus the switching difference (about 0.085 MPa) is the lower switching value.
How to adjust the set value to the lower switching value
0.05～2.5）MPa的控制器，但要求压力下降至1.8MPa(此值为下切换值）发出触点信号。 A controller with a setting range of ( 0.05 to 2.5) MPa is also selected , but the pressure is required to drop to 1.8 MPa (this value is the lower switching value) to send a contact signal.
1. Loosen the lock and screw the controller into the threaded interface of the calibration table; open the cover, pass the cable through the cable interface to the terminal board, and connect the other end of the cable to the multimeter.
2. Pressurize to 1.8MPa, this value can be read by standard pressure gauge; turn the setting value adjustment lever counterclockwise to make the setting value change from small to large, until the micro switch is switched at 1.8MPa.
3. Rotate the lock to adjust the pressure of the calibration table so that it changes back and forth at 1.8MPa. When the verification pressure drops, the switching value is 1.8MPa. This value is the required lower switching value. This value plus the switching difference (about 0.85MPa) is the upper switching value.