temperature digital level humidity controller - A18

temperature digital level humidity controller

1. INTRODUCTION.

A18 series temperature controller is an economical and easy to operate industrial temperature controller. It is designed for various applications, for plastic industries, food processing equipment’s, packaging equipments’s, environmental test instrument’s and general In-process temperature controls (eg. Furnace, Drum heating, Pipe line heating)

Using Advance artificial intelligence control algorithm with Auto tuning , A18 reduces the “overshoot” problem without the need of going through a complicated PID parameter setting pre-run. A18 can achieve precise controls with minimum set up time.

The temperature controller has an advanced Modular Output structure allow various outputs options be configured for quick delivery. This also allows easy field service and to implement regular maintenance program ( example, replace a new Relay Module for every 100,000 hours of estimated switching operations)

It can be operate with universal line voltage, of 100~240VAC 50/60 Hz power supply.

2. TECHNICAL SPECIFICATION OF TEMPERATURE CONTROLLER.

• Input type: RTD.
• Measurement range : Pt100 (-200~600 degree C ).
• Measurement accuracy: 0.3%FS±1 degree C
• Temperature display resolution: 1/0.1 degree C.
• Control mode: On-off control mode or Artificial Intelligence control with auto tuning.
• Output mode (modularized) : SSR
• Alarm function: High limit and deviation high alarm.
• Power supply voltage rating: 100-240VAC, -15%, +10%; 50-60Hz.
• Power consumption: ≤5W.
• Ambient : Temperature -10~60 degre C , Relative humidity of 0~90RH%.

3.MODEL CODE SELECTION :

Artificial Intelligence control and auto tuning

When A18 Control method (Refer to 6. Parameter & Setting) is chosen, the Control parameters (PID) can be obtained by running auto-tuning.

At the first time of running auto-tuning, during measure/operating status, press“<<" for 2 seconds, “At” (Auto Tuning) will flash at lower display window and the instrument executes its auto-tune controls... After several cycles of Controls action, the instrument will obtain the values of PID control parameters. If you want to escape from auto tuning status, press“<<" and hold for about 2 seconds until the "At" flash stops. Depending on the physical temperature control system set up, the time of auto tuning can be several seconds to several hours. Once the auto tuning completed, the parameter “CTRL” automatically set to 3 (the initial value is 1) or 4, no more auto tune is allowed. That is to say, if another “auto tuning” is needed, user will need to enter Field Parameter Table Set up mode again, to set the Control parameter “CTRL” to 2.

Practical Consideration before running an Auto-Tune

Note 1: Before running auto-tuning, set point should be set to an often-used value or if not, set to a middle value before initiate an auto-tuning. Generally, for application with 10%~80% time on heating can obtain satisfying auto-tuning result. If the heating time is not in the range of 10~80%, the auto-tuning will run for a long time and can’t get satisfying result. Raising set point for heating time less than 10% or decreasing set point for heating time greater than 80% can improve auto-tuning result.

Note 2: Don't modify the set point during auto-tuning. It may affect the precision of auto-tuning.

Note 3: After auto-tuning finishes, generally, the temperature rising has a little over-shoot (about 1~3°C). It is because considering that the transducer is often placed between the heater and heated material, and a little over-shoot can shorten the time of rising to set point and save Power. (Generally, the temperature of transducer can be raised quickly than that of heated material).

FRONT PANEL AND OPERATION

Basal display status: When power on, the upper display window of the instrument shows the process value (PV), and the lower window shows the set point (SV). This status is called basal display status. When the input signal is out of the measurable range (for example, the thermocouple or RTD circuit is break, or input specification sets wrong), the upper display window will alternately display “orAL” and the high limit or the low limit of PV, and the instrument will automatically stop output.

Details photo of temperature controller