How Does a Manual Thermostat Work?

A thermostat is a temperature sensing device that keeps the controlled part within a certain temperature range by automatically opening or closing the circuit under normal operation. Its operating temperature is only fixed or adjustable.

The thermostatted autosampler is equipped with a cooling / heating module and uses Peltier elements to effectively cool the air. When turned on, the front of the Peltier element is heated / cooled according to the temperature. The fan draws air from the sample tray area and passes it through the channels of the heating / cooling module. The fan speed is determined by the environmental conditions (eg ambient humidity, temperature). In the heating / cooling module, the air reaches the temperature of the Peltier element, then these thermostats are blown under a special sample pan, distributed evenly there, and flow back to the sample pan area. From there, the air enters the thermostat. This cycling mode ensures efficient cooling / heating of vials.

In cooling mode, the other side of the Peltier element becomes very hot and must be cooled in order to maintain vision performance, which is achieved by a large heat exchanger on the back of the thermostat. The four fans blow the air from left to right together to expel the heated air. The fan speed determines the temperature control of the Peltier element.

During cooling, condensation can occur in the heating / cooling module. Condensate will be trapped everywhere in the thermostat. ^[1]

There are generally several types of thermostats:

Plug-in type --- The thermostat is installed on the pipe and the sensitive components are inserted into the pipe;

Immersion --- Sensitive element is immersed in the liquid of the pipe or container to control the liquid;

Surface type --- sensitive components are mounted on the surface of the pipeline or similar. ^[2]

The setting range of thermostat pressure gauge (5 35 )

Precautions for using the thermostat

1. Do not disconnect or reconnect the cable between these two parts when either the autosampler or the thermostat autosampler is powered. This will damage the circuit of the module.

2. Unplug the power cord from the autosampler and thermostat to disconnect the autosampler from line power. However, even if the power switch on the front panel of the autosampler is turned off, the autosampler is still powered. Make sure you can unplug it at any time.

3. If the device is connected to more than the specified line voltage, it may cause an electric shock hazard or damage the instrument.

4. Make sure that the condensate pipe is always above the liquid level of the container. If the condensate pipe reaches into the liquid, the condensate cannot flow out of the pipe and block the outlet. This will damage the circuit of the instrument. ^[3]

temperature range

The most common use of a thermostat is to control room temperature.

Typical applications are: controlling gas valves; controlling oil stove regulators; controlling electric heating regulators; controlling refrigeration compressors; controlling gate regulators.

The room temperature regulator can be used to provide a variety of control functions, such as heating control; heating --- cooling control; day and night control (night control at a lower temperature); multi-level control, one or more levels of heating, Multi-stage cooling, or a combination of multi-stage heating and cooling control.