ZNW-152B and ZNW-153BStainless steel differential pressure gauge(hereinafter referred to as differential pressure gauge) is suitable for measuring the flow rate, differential pressure and other parameters of various liquid (gas) media in the process flow of industrial sectors such as metallurgy, power, chemical industry, chemical fiber, nuclear power, etc. The overall structural design of the stainless steel differential pressure gauge instrument is reasonable, the process is advanced, it has the advantages of small size, light weight, good stability, long service life, novel appearance, and strong adaptability.Medium energy instruments are preferred for pressure gauges. The structure of the stainless steel differential pressure gauge is entirely made of stainless steel, and the measuring system (double bellows and connecting components) and pressure guiding system (including joints, conduits, etc.) are made of special austenitic stainless steel, which has strong corrosion resistance and resistance to the impact of working environment erosion; The connection forms of instrument connectors include parallel type (which can be directly connected to a three valve group) and oblique type, which can adapt to the matching installation of different users.
■Stainless steel differential pressure gaugeStructural principle:
The stainless steel differential pressure gauge adopts a double corrugated tube structure. Two corrugated pipes are installed symmetrically on both sides of the "I-shaped" bracket; The upper and lower ends of the "I-shaped" bracket are respectively the movable end and the fixed end, and the middle is connected by a spring plate; Two corrugated tubes are in parallel and connected to the high and low voltage connectors on the watch case through conduits; The gear transmission mechanism is directly installed on the fixed end of the bracket and connected to the movable end of the bracket through a pull rod; The dial is directly fixed on the gear transmission mechanism.
The working principle of stainless steel differential pressure gauge is based on the use of two corrugated tubes with the same stiffness as the pressure sensing element. Therefore, under the same measured medium, they are forced to generate the same concentrated force on the movable bracket. Since the spring plate on both sides does not produce disturbance under equal torque, the bracket is still in its original position, and the gear transmission mechanism does not move, so the pointer still points to zero.Medium energy instruments are preferred for pressure gaugesWhen different pressures are applied (usually the high-pressure end is higher than the low-pressure end), the forces acting on the movable support by the two corrugated pipes are not equal, causing corresponding displacements and driving the gear transmission mechanism to transmit and amplify. The differential pressure value between the two is indicated by the deflection of the pointer.

□ Applicable Notice
1. The instrument should be installed vertically at the same level as the measuring point, otherwise additional errors caused by liquid level differences should be taken into account as appropriate.
2. The instrument connector marked with "H" is the high voltage end, and the one marked with "L" is the low voltage end.
3. When measuring differential pressure, the differential pressure value of the instrument can be used within 75% of the upper limit of the scale range, and the maximum static pressure value of the system should not exceed the maximum static pressure value specified by the instrument.
4. As shown in Figure 3, a balance (safety) valve (Valve 1) should be installed in front of the high and low pressure inlet of the instrument during installation, and should be in the open position. After all Valves 2 and 3 are open, the balance valve should be closed.
5. Before using the instrument, the degree of corrosion caused by the measured medium should be carefully verified to avoid early corrosion damage to the bellows.
6. During regular maintenance of instruments, if it is necessary to open the cover, special tools should be used.
7. When the instrument's indication error increases due to temperature changes and directly affects the accuracy of measurement, the protective plug protrusion on the case can be removed.


Main technical indicators of stainless steel differential pressure gauge:
1. Measurement range, nominal working pressure, accuracy level, and joint thread size of stainless steel differential pressure gauge:

2. Stainless steel differential pressure gauge pressure system and housing materials:

3. Environmental temperature for the use of stainless steel differential pressure gauge:- 40～70℃
4. Stainless steel differential pressure gauge weight: approximately 1.5kg
5. Protection level of stainless steel differential pressure gauge housing: IP54
6. The technical performance of the stainless steel differential pressure gauge complies with the enterprise standard Q/YXBM831-1997 "Stainless Steel Differential Pressure Gauge"
7. Stainless steel differential pressure gauge resistant to working environment vibration: V.H.3 levelMedium energy instruments are preferred for pressure gauges.

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