The difference between bimetallic thermometer and pressure type thermometer

There are a lot of instruments and meters, such as: double metal thermometer, pressure type thermometer, pressure gauge, electronic thermometer, etc. , different instruments have different characteristics, the role of is also different, so the difference is very big, here said the difference between the bimetallic thermometer and pressure type thermometer. Bimetallic thermometer is a round shape into threaded heat bimetallic strip as thermal devices, and put it in a protective sleeve tube, one end is fixed, known as the fixed end, the other end of the connection on a thin shaft, a free end. Spool at the free end is equipped with a pointer. When the temperature changes, the resulting thermal devices the free end of the rotation, drive the thin axis from the Angle of the pointer changes, the corresponding temperature indicator on the dial; Straight table by steering transmission mechanism drive the pointer changes. Due to the thermal device has a linear relation with temperature changes, so the position of the pointer indicated by bimetallic temperature sensor, that is, the temperature of the measured values. Watchcase material can be steel plate, casting alloy and stainless steel plate; Detecting element also have core-pulling structure; Adjustable Angle meter part of the temperature sensor by means of the corrugated pipe, Angle of body parts, such as can be from the Angle to the straight or from the straight to the Angle at any Angle. The bimetallic thermometer features: double metal more reliable, wide measuring range, but much must match thermal resistance and thermocouple. Pressure type thermometer is the use of liquid or gas pressure or volume made of the characteristics of non-contact temperature sensor with temperature change. As a result of the change of pressure change in the curvature of spring tube, and the free end displacement, through the connecting rod and direct drive gear drive the pointer on the dial indicator temperature changes in the value. They apply to measure all kinds of industrial occasions on which do not corrode copper and copper alloy liquid, gas, and steam, etc. The temperature of the medium, and can work in temperature at or above the given value when the signal, the thermometer can also be used as a contact switch circuit in the temperature control system. Cooperate with all kinds of casing installation, satisfies the requirement of different pressure levels. Can be directly measured in the process of various - 80 ~ + 500 ℃ within the scope of liquid, steam and gas medium, as well as solid surface temperature measurement. Pressure type thermometer features: use of simple, cheap, mainly can be far eastone; In choosing some industrial temperature time, and sometimes choose the bimetallic thermometer and pressure type thermometer can be, to play a role of no big impact! So, this time should go to learn about their respective characteristics and advantages.