DYM3 Air Box Barometer Atmospheric Pressure Weather Aneroid Barometer For Weather Stations And Other Departments
General Introduction
DYM3 type empty box barometer is an atmospheric pressure measuring instrument with deformation element as sensing. It is widely used in meteorology, military, aviation, navigation, agriculture, surveying, geology, industrial and mining enterprises, scientific research and other fields due to its advantages such as convenient carrying, accurate measurement, wide pressure measurement range, easy use and maintenance, and no mercury pollution. Conventional instruments of atmospheric pressure.
Working Principle
The empty box barometer uses a thin film empty box made of elastic metal as a sensing element, which converts atmospheric pressure into an elastic displacement of the empty box, and drives the pointer through a lever and a transmission mechanism. When deflected in a clockwise direction, the pointer indicates the amount of change in the increase in air pressure, on the contrary, when the pointer deflects in the counterclockwise direction, it indicates the amount of change in the decrease in air pressure. When the elastic stress of the empty box is balanced with the atmospheric pressure, the pointer stops rotating, and the air pressure value indicated by the pointer at this time is the current atmospheric pressure value.
Technical Performance and Specifications
1. Measuring range: 800¢¦1064hpa
2. Operating temperature range: -10¢¦+40¡É
3. The measurement error after temperature, indication and supplementary correction is not more than 2.0hpa
4. The minimum score of the indicating plate: 1hpa
5. Minimum score with temperature meter: 1¡É
6. Instrument weight: not more than 1.5Kg
7. Instrument size: 156mm*156mm*115mm
Instructions
1. When using, please place the empty box barometer horizontally.
2. For reading, please tap the case or surface glass of the instrument gently with your fingers to eliminate friction in the transmission mechanism.
3. When observing, the pointer overlaps with the mirror pointer. At this time, the value pointed by the pointer is the pressure value, and the reading is accurate to one decimal place.
4. Read the temperature indicated on the barometer, accurate to one decimal place.
5. Calculation of the pressure value: The pressure value read on the instrument can only be used after the following corrections.
1. Temperature correction: Due to the change of ambient temperature, it will affect the elasticity of the instrument metal, so temperature correction must be carried out. The temperature correction value can be calculated as follows: ¡âPt=a.t where ¡âPt--temperature correction value a--temperature coefficient value (attached on the verification certificate) t--temperature meter reading
2. Indication correction, due to the non-linearity of the empty box and its transmission, an indication error will occur when the air pressure changes, so it must be corrected. Calculation method: Correct the indicated value according to the indication on the calibration certificate, within the range of the corresponding air pressure indicated value: Use interpolation to calculate the value to correct indicated value ¡âps
3. Supplementary correction: In order to eliminate the influence of the remaining deformation of the empty box on the indication value, the supplementary correction value ¡âpd is obtained from the verification certificate
The corrected air pressure value can be shown by the following formula: p=ps+(¡âpt+¡âps+¡âpd)
Precautions
1. The instrument must be placed horizontally when working to prevent reading errors caused by tilt.
2. The user must not take out the instrument in the plastic casing to avoid unnecessary damage. If there is any fault, please send it to the meteorological measurement agency or work for repair.
3. As the supplementary correction value of the instrument changes over time, the supplementary correction value shall not exceed the six-month period of use. If it exceeds, the verification must be performed again.
5.4 The user is not allowed to move the adjustment screw without authorization, so as not to increase the error of the instrument.
Storage, Transportation and Packaging
1. The instrument should be stored in a dry place with good ventilation, no corrosive gas and severe vibration.
2. The instrument can be transported by any method other than air transport.
3. The packaging box of the instrument must be filled with shock absorbers, and the words "handle with care", "precision instrument" and "not upside down" should be marked on the outside of the box.
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