Thermostat Introduction

A thermostat is a temperature-sensing device that automatically opens or closes a circuit to keep the controlled part within a certain temperature range under normal operation, and its operating temperature is only fixed or adjustable.

A thermostat is a cooling system device that directly or indirectly controls one or more heat and cold sources to maintain the desired temperature. For a thermostat to perform this function, it must have a sensing element and a converter. The sensing element measures the change in temperature and produces the desired effect on the converter. The converter converts the action from the sensitive element into an action capable of properly controlling the temperature-changing device.

Common thermostat brands include Hitachi thermostat, Mitsubishi thermostat, Kubota thermostat, etc.

How A Thermostat Works

The thermostatted autosampler is equipped with cooling and heating modules, using Peltier elements for efficient cooling of the air. When switched on, the front side of the heating/cooling Peltier element is set according to the temperature. Fans draw air from the sample tray area and pass it through the channels of the heating or cooling modules. Fan speed is determined by environmental conditions. In the heating/cooling module, the air reaches the temperature of the Peltier elements, these thermostats are then blown under the special sample pan, where it is evenly distributed and flows back into the sample pan area. From there the air enters the thermostat. This circulation mode ensures efficient cooling/heating of the vials.

In cooling mode, the other side of the Peltier element becomes so hot that it must be cooled to maintain farsighted performance, and this is achieved by a large heat exchanger on the back of the thermostat. Four fans blow the air together from left to right and exhaust the heated air. The fan speed determines the temperature control of the Peltier element.

During cooling down, condensation can form in the heating/cooling modules. Condensation will be poured out of the thermostat.

Classification of Thermostats

The types of thermostats generally have the following types:

Plug-in type: the thermostat is installed on the pipe and the sensitive element is inserted into the pipe.
Immersion type: the sensitive element is immersed in the liquid in the pipe or container to control the liquid.
Surface type: the sensitive element is installed on the surface of the pipe or similar surface.

The Use of Thermostat

When either the autosampler or the thermostatic autosampler is powered on, never disconnect or reconnect the cables between these two components. This will destroy the circuit of the module.
Unplug the power cord from the autosampler and thermostat to disconnect the autosampler from line power. But even if the power switch on the front panel of the autosampler is turned off, the autosampler is still powered, please make sure that the power plug can be unplugged at any time.
If the equipment is connected to a line voltage exceeding the specified line voltage, it will cause an electric shock hazard or instrument damage.
Make sure that the condensate pipe is always above the liquid level of the container. If the condensate tube extends into the liquid, the condensate cannot flow out of the tube and blocks the outlet, which can damage the instrument's electrical circuitry.