- Place of Origin: Guangdong, China (Mainland)
- Brand Name: SKG
- Model Number: TREX-CH102
- Usage: Industrial
- Theory: Temperature Controller
- Housing color: black
- Perforate dimension: 45*45mm(W*H)
- External dimension: 48*48*90mm(W*H*D)
- Display units: twin 3-digit LED
- Control deflection: +-1 digit
- Control mode available: PID; ON-OFF
- Input signal available: TC; RTD
- Power supply: Standard power: 110V/60Hz, 220VAC/50Hz
Packaging & Delivery
|Packaging Details:||for 48*48 size, packing 7*5*12cm paper box per unit, 108 PCS in one Carton;
for 72*72 size, packing 8.5*8.5*15cm paper box per unit, 36 PCS in one Carton;
for 48*96 size, packing 5.5*10*13.5cm paper box per unit, 44 PCS in one Carton;
for 96*96 size, packing 12*10*16.5cm paper box per unit, 36 PCS in one Carton;
Carton dimension: 58cm*36cm*28cm paper cartion
|Delivery Detail:||10~30 days|
SpecificationsTREX-CH series intelligent control instrument
1.easy operating, auto-tuning
TREX-CH series intelligent control instrument
1.easy operating, auto-tuning
Widely used in refrigeration, food machinery, plastic machinery, washing machinery(automatic control system).
High accuracy and easy operation. Self diagnoses sensor abnormal and overstep scale prompts function. Various input types are available, including thermocouple, thermal resistance and linear signal etc.. Various alarm mode combination. Power-free alarm function. Create a new unique AI adjust mode via combining PID arithmetic and fuzzy control theory, which enable the controller to meet a variety of control system requirements. No overshoot, strong resistance to interference.
How do temperature controllers (thermostats) work
To accurately control process temperature without extensive operator involvement, a temperature control system relies upon a controller, which accepts a temperature sensor such as a thermocouple or RTD as input. It compares the actual temperature to the desired control temperature, or setpoint, and provides an output to a control element. The controller is one part of the entire control system, and the whole system should be analyzed in selecting the proper controller. The following items should be considered when selecting a controller:
- Type of input sensor (thermocouple, RTD) and temperature range
- Type of output required (electromechanical relay, SSR, analog output)
- Control algorithm needed (on/off, proportional, PID)
- Number and type of outputs (heat, cool, alarm, limit)
What Are the Different Types of Controllers, and How Do They Work
There are three basic types of controllers: on-off, proportional and PID. Depending upon the system to be controlled, the operator will be able to use one type or another to control the process.
An on-off controller is the simplest form of temperature control device. The output from the device is either on or off, with no middle state. An on-off controller will switch the output only when the temperature crosses the setpoint. For heating control, the output is on when the temperature is below the setpoint, and off above setpoint. Since the temperature crosses the setpoint to change the output state, the process temperature will be cycling continually, going from below setpoint to above, and back below. In cases where this cycling occurs rapidly, and to prevent damage to contactors and valves, an on-off differential, or “hysteresis,” is added to the controller operations. This differential requires that the temperature exceed setpoint by a certain amount before the output will turn off or on again. On-off differential prevents the output from “chattering” or making fast, continual switches if the cycling above and below the setpoint occurs very rapidly. On-off control is usually used where a precise control is not necessary, in systems which cannot handle having the energy turned on and off frequently, where the mass of the system is so great that temperatures change extremely slowly, or for a temperature alarm. One special type of on-off control used for alarm is a limit controller. This controller uses a latching relay, which must be manually reset, and is used to shut down a process when a certain temperature is reached.
Controller type provides proportional with integral and derivative control, or PID. This controller combines proportional control with two additional adjustments, which helps the unit automatically compensate for changes in the system. These adjustments, integral and derivative, are expressed in time-based units; they are also referred to by their reciprocals, RESET and RATE, respectively. The proportional, integral and derivative terms must be individually adjusted or “tuned” to a particular system using trial and error. It provides accurate and stable control, and is best used in systems which have a relatively small mass, those which react quickly to changes in the energy added to the process. It is recommended in systems where the load changes often and the controller is expected to compensate automatically due to frequent changes in setpoint, the amount of energy available, or the mass to be controlled.
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