Quick Detail

Level first
Uncertainty 0.005%
Material 304 SS 1Cr18Ni9Ti
Specifications 1L-20L
Use to detect second-class standard metal measuring device
Implementation Rules JJG259-2005 "Standard Metal Measuring Instruments"
Product introduction The product is 1L 2L 5L 10L 20L first-class standard measuring unit

First-class standard metal measuring instrument main technical indicators

1. The maximum allowable error is ±5×10-5

2. The indexing volume of the first-class standard metal measuring device shall not exceed 2.5×10-5 of its nominal capacity.

3. The main material of the first-class standard metal measuring device is applied. 1Cr18Ni9Ti stainless steel plate manufacturing

4. The outer wall of the metal measuring device should be smooth and flat. The first metal measuring device should be touched by hand. Other metal measuring instruments should be observed with the naked eye, and there should be no unevenness; the inner wall should be polished to ensure the minimum liquid residue of the metal measuring device.

5. The valve of the first-class metal measuring device shall adopt a three-way valve and shall have clear signs of “injection”, “close” and “exclude”.

6, the first measurer can only be used in a constant temperature laboratory at 20 ° C, and the medium used is distilled water or purified water.

7. In order to ensure that there is no air bubble when injecting the metal measuring device, the liquid residual amount on the wall of the liquid is the smallest when the liquid is discharged, and the angle between the upper cone and the lower cone should be ≤120°.

8. In order to ensure that the metal measuring device is in a horizontal state, an adjustable 0.05 mm/m tubular level should be installed in the two mutually perpendicular horizontal directions of the main body of the metal measuring device.

9. In order to facilitate the adjustment of the liquid level, a fine-adjusting liquid discharge valve should be installed at the position of the metal measuring instrument at the bottom of the neck below the measuring neck scale.

10. The length of the measuring neck scale is determined according to the requirements of use; the liquid level scale of the nominal capacity should be located in the middle of the measuring neck.

11. A liquid level tube should be installed in the metering neck reading position. The liquid level tube camp is made of colorless transparent hard glass. The inner diameter of the tube should be uniform between DN5.6~16mm, and the surface of the tube should be free from obstructing observation liquid. For surface defects, the upper part of the tube should communicate with the overflow hood.

12. The metering neck ruler and the reading cursor are processed by the longitude chromium process (except for stainless steel materials). The zero point of the metering neck ruler should be at the bottom of the mounting position. The measuring neck scale and the reading and reading cursor markings should be clear, and the width of the marking line must not exceed 0.25 mm.

13. The plexiglass ring parallel to the liquid surface should be installed on the reading cursor. The ring should have an annular score line that is less than 0.25 mm wide and that the liquid level tube resides in the middle of the plexiglass ring. The connection of the plexiglass ring to the reading cursor is guaranteed to be relative.

14. The metal measuring device should be artificially aged to eliminate stress during manufacture to prevent it from being easily deformed due to stress changes during use.

15. The metal measuring device shall not have leakage after filling the medium or during the filling and discharging process; the connection between the valve and the metal measuring instrument body shall be firm and there shall be locking measures to prevent the volume of the metal measuring device due to the looseness of the valve. A change has occurred.

16. The exhaust capacity of the metal measuring device shall not exceed 0.2 dividing volume. The metal measuring device waits for 2 minutes in the trickle state, and there must be no intermittent continuous flow and surge discharge.

17, to ensure the mechanical properties of the metal measuring device, the maximum working pressure of the metal measuring device should be greater than 50KPa.