The practical application of differential pressure transmitter and advantages1

Differential pressure transducer is used to prevent the medium directly into the transmitter in the pipeline pressure diaphragm between the transmitter and capillary connected by the filled with fluid. It is used to measure the liquid level of liquid, gas or steam, flow and pressure, and then transform it into 4 ~ 20 ma DC signal output. Some practical applications and advantages of differential pressure transmitter?

design conditions: 2000 m3 tank, d = 145 m in diameter, height can get the actual oil inventories G, from the model also shows its density rho h = 14 m.

a table: 1151 lt flange flame-proof differential pressure transmitter, selects the flange is to prevent the tank bottom dirt deposits and blocking pressure tube, transmitter range 0 to 140 kpa.

the second table: choose WP series intelligent column display alarming device, universal signal input, can be arbitrary change range, with the column display liquid level, with digital display tons of oil. 6 # tank, for example, S = PI * r2 = 314 * 7252 = 165 m2, high of 14 m.

on the top of the tank, differential pressure transmitter design a set of liquid level alarm device, prevent oil overflow, as a double insurance. In applications due to the measured values directly for the tonnage, therefore, no matter what kind of oil storage tank, the second table shows the value of the tonnage is in oil tank, avoiding the need to determine the density of conversion of the trouble.

general oil differential pressure transmitter, is often used for the pump through the oval gear flowmeter measurement, due to the precision of flowmeter is limited, only highest grade 02, differential pressure transmitter to measure density calculation, the result often deviates, causing metering disputes. Now because of the oil tank measurement results for the tonnage, and precision can reach grade 02 01 level, even so, compared with the displacement meter, differential pressure transmitter more accurate measurement results. Loading and unloading, though in a small amount of oil because of resolution, the results of the measurement of absolute error is bigger, but in a large number of loading and unloading, oil its higher precision and smaller relative error, the differential pressure transmitter is unmatched by other measurement methods, especially suitable for monthly, quarterly and annual inventory.

the practice shows that the main advantages are:

1. Easy and convenient installation and maintenance;

2. Reading directly clear intuitive, can be directly read out oil inventories;

(3) from the determination of the density and conversion.

1: do not use more than 36 v voltage is added to the transmitter, the transmitter were damaged;

2: do not use hard objects to touch diaphragm, result in isolation membrane damage;

3: do not allow the ice measured medium, otherwise will damage the sensor element isolation diaphragm and cause damage in the transmitter, the transmitter as needed temperature protection, in case of freezing;

4: when measuring steam or other high temperature medium, its temperature should not exceed transmitter when using the limits of temperature, higher than that of transmitter using limit temperature cooling device must be used;

5: measuring steam or other high temperature medium, radiator pipe should be used, the transducer and the pipe together, and use the line pressure to the transformer. When the measured medium is water vapor, in the radiator pipe to inject the right amount of water, in case of direct contact with the transducer of superheated steam, damage to the sensor;

6: in the process of pressure transmission, should pay attention to the following

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a, transmitter and radiator pipe joint, do not leak;

b, before use, if the valve is closed, is used, should be very careful, slowly open the valve, in order to avoid direct impact sensor diaphragm measured medium, so as to damage the sensor diaphragm;

c, must be kept open in pipeline, pipeline of sediment will pop up, and damage the sensor diaphragm;

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key words: thermal resistance, thermocouple, thermal resistance, platinum resistance, PT100, PT1000, pressure sensor and digital temperature sensor