Heng Ode latest version of the thermometer classification maintenance and troubleshooting
The thermometer is a kind of thermometer. It uses the principle of infrared transmission to sense the surface temperature of the object. It is convenient to operate, especially the measurement of high temperature objects. Wide range of applications, such as steel casting, furnace temperature, machine parts, glass and room temperature, body temperature and other surface temperature measurements. At present, more infrared thermometers are used.
maintain
1. Replace the battery
To install or replace the battery, open the battery compartment and insert the battery as shown in Figure 2.
2. Cleaning lens
Use clean compressed air to blow off the falling particles. Carefully wipe the surface with a damp cotton swab. The cotton swab can be moistened with water.
3. Clean the case
Soak a sponge or a soft cloth with soap and water. To avoid damage to the thermometer, never immerse the instrument in water.
Troubleshooting
symptom
problem
action
OL (on the display)
Target temperature out of range
Select targets within the scope of the indicator
-OL (on the display)
Target temperature is below range
Select targets within the scope of the indicator
Low battery
Replacement battery.
Display blank
May run out of battery
Check and / or replace the battery.
Laser does not work
1. The battery is low or the battery is exhausted
2. Ambient temperature is higher than 40 ° C (104 ° F)
1. Replace the battery.
2. Suitable for use in areas with low ambient temperatures
Buzzer sounds long
Is there a High/Low function?
And the measured value has a limit value
Reset or cancel the limit setting.
Thermometer classification
With the development of science and technology and the needs of modern industrial technology, temperature measurement technology is constantly improving and improving. As the temperature range is wider and wider, different temperature measuring instruments are manufactured according to different requirements. Here are a few
Gas thermometer
Hydrogen or helium is often used as a temperature measuring substance, because the liquefaction temperature of hydrogen and helium is very low, close to absolute zero, so its temperature range is wide. This thermometer is highly accurate and is used for precision measurements. .
Resistance thermometer
Divided into a metal resistance thermometer and a semiconductor resistance thermometer, both are based on the characteristic that the resistance value changes with temperature. Metal thermometers are mainly made of pure metals such as platinum, gold, copper, nickel, and bismuth iron or phosphor bronze alloys; semiconductor thermometers mainly use carbon and germanium. Resistance thermometers are easy to use and have been widely used. Its measurement range is from -260 ° C to 600 ° C.
Far infrared thermometer
ST60 ring laser aiming, 0.1°C display, adjustable emissivity, high/low temperature alarm, data re-adjustment, maximum, minimum, difference, average display, D: S=30:1, store 12 measurement points data . SM series °C/°F temperature unit conversion, data hold display function, auto power off function, backlight display selection function, laser target display selection function, average and temperature difference measurement function, maximum and minimum measurement function, measurement data storage function (power off Memory), response time and response value are long and repetitive.
Thermocouple thermometer
It is a kind of temperature measuring instrument widely used in industry. Made using the thermoelectric phenomenon. Two different wires are welded together to form a working end, and the other ends are connected to a measuring instrument to form an electric circuit. When the working end is placed at the temperature to be measured and the working end and the free end temperature are different, an electromotive force will appear, so that a current flows through the circuit. The temperature at another location can be determined by measuring the electrical quantity using the temperature at a known location. This kind of thermometer is mostly composed of copper-constantan, iron--constantan, nickel--constantan, gold-cobalt--copper, platinum--anthracene. It is suitable for use between two substances with large temperature difference, and is mostly used for high temperature and low turbidity measurement. Some thermocouples can measure high temperatures up to 3000 °C, and some can measure low temperatures close to absolute zero.
High temperature thermometer
It is a thermometer specially used to measure temperatures above 500 °C. There are photometric thermometers, colorimetric thermometers and radiation thermometers. The principle and construction of high temperature thermometers are complex and will not be discussed here. Its measurement range is from 500 ° C to 3000 ° C, not suitable for measuring low temperature.
Pointer thermometer
It is a thermometer like a dashboard, also known as a thermometer. It is used to measure room temperature and is made by the principle of thermal expansion and contraction of metal. It uses a bimetal as a temperature sensing element to control the pointer. Bimetals are usually riveted together with copper and iron, with the copper on the left and the iron on the right. Since the thermal expansion and contraction effect of copper is much more obvious than that of iron, when the temperature rises, the copper piece pulls the iron piece to the right, and the pointer is deflected to the right under the action of the bimetal (pointing to high temperature); The temperature becomes lower and the pointer is deflected to the left (pointing to low temperature) under the action of the bimetal.
Special attention should be paid to the use of mercury thermometers:
1. Before using it to measure our body temperature, you should carefully check it to see if the measured temperature is accurate;
2. If the temperature of the subject is higher than the highest temperature that can be measured, then you cannot use this temperature agent to measure the temperature of the subject;
3. Generally speaking, all temperature agents are very sensitive to heat and have their inertia. You can accurately tell the temperature when it is in a stable state. When reading the temperature, the line of sight should be liquid. The scale of the surface is parallel;
4. If you accidentally get damaged (broken), you can use the following two methods to minimize the damage of mercury to the human body.
One of the methods: cold repair method to insert the damaged temperature agent into objects with extremely low temperature, such as alcohol, the maximum temperature can not exceed -38 ° C, so that the mercury in the temperature agent will return to the temperature measurement bubble due to low temperature. Inside, it will not cause damage to the human body;
Method 2: The hot repair method puts the damaged temperature agent into the thermostatic bath whose temperature is higher than its maximum temperature. At this time, the broken mercury will be connected in a straight line inside, then you can slowly take the thermometer Come out, in the air, it will slowly cool, then the mercury will drop to the room temperature scale.
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symptom
problem
action
OL (on the display)
Target temperature out of range
Select targets within the scope of the indicator
-OL (on the display)
Target temperature is below range
Select targets within the scope of the indicator
Low battery
Replacement battery.
Display blank
May run out of battery
Check and / or replace the battery.
Laser does not work
1. The battery is low or the battery is exhausted
2. Ambient temperature is higher than 40 ° C (104 ° F)
1. Replace the battery.
2. Suitable for use in areas with low ambient temperatures
Buzzer sounds long
Is there a High/Low function?
And the measured value has a limit value
Reset or cancel the limit setting.
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