MK series intelligent pressure module

feature

★ Exquisite and sturdy exterior structure, integrated packaging, good performance.

Unified standard signal transmission, compatible with any digital pressure gauge of the company to achieve range expansion.

The module has a built-in CPU, 24 bit A/D, and temperature sensor, which independently completes continuous correction of the zero point, linearity, and temperature drift of the pressure sensor, ensuring the accuracy and reliability of the output signal.

The long-term stability (time drift) of the module can be adjusted by the host in a timely manner to ensure the accuracy of the instrument over a long period of time.

Module selection method

Firstly, the customer needs to clearly confirm the pressure range Pmax, minimum pressure range Pmin, accuracy △ of the tested instrument, and accuracy △ of the pressure module in the existing tested pressure instrument;

According to the standard table, the accuracy is 1/4 of the accuracy of the verified table, and the value transfer relationship is used to calculate the multiple n of the pressure module range covering the verified table range. n=△ verified/(△ module × 4);

★ The range of the pressure module is selected as follows:

Only the pressure module range P1 must select Pmax, that is, P1=Pmax。 Only the pressure module P1 can cover the range of the tested meter, which is P1/n;

The range of the second pressure module P2 should be selected to be less than P1/n for the next measured range; The second pressure module P2 can cover the range of the tested meter, which is P2/n;

The range of the third pressure module P3 should be selected to be less than P2/n for the next tested meter range; The third pressure module P3 can cover the range of the tested meter, which is P3/n;

The range of the fourth pressure module P4 should be selected as the range of the next tested meter that is less than P3/n; The fourth pressure module P4 can cover the range of the tested meter, which is P4/n;

…………

Until it covers the minimum range Pmin of the tested meter.

For example:

There is currently a power plant that has pressure transmitters with the following ranges -100 kPa、5kPa、10kPa、25kPa、60kPa、100kPa、 160kPa、1MPa、2MPa、6MPa、10MPa、25MPa、30MPa、60MPa The accuracy of this batch of instruments is 0.5%. Firstly, we design with the accuracy of the standard being 1/4 of the accuracy of the tested meter, and then consider from the range downwards. We have selected the following pressure modules as follows:

According to the first and second steps of the above calculation method, it is known that Δ is detected at 0.5% and Δ module at 0.05%. Therefore, it is confirmed that the pressure module range covers the multiple of the measured range n of the detected meter; n=Δ is detected/(Δ module x 4)=0.5%/(0.05% x 4)=2.5;

Step 2: According to the third calculation method mentioned above, select the range of the pressure module as follows:

Only the pressure module with a range of P1 must select a 60MPa pressure module, that is, P1=60MPa。 Only the pressure module P1 can cover the range of the tested meter, which is P1/n=60MPa/2.5=24MPa;

The range of the second pressure module P2 should be selected as the next range of the tested meter that is less than 24MPa (P1/n=60MPa/2.5=24MPa), that is, P2=10MPa; The range that the second pressure module P2 can cover to the tested meter is P2/n=10MPa/2.5=4MPa;

The range of the third pressure module P3 should be selected as the next range of the tested meter that is less than 4MPa (P2/n=10MPa/2.5=4MPa), that is, P3=2MPa; The third pressure module P3 can cover the range of the tested meter, which is P3/n=2MPa/2.5=0.8MPa;

The range of the fourth pressure module P4 should be selected as the next tested range less than 0.8 MPa (P3/n=2MPa/2.5=0.8 MPa), that is, P3=160 kPa; The fourth pressure module P4 can cover the range of the tested meter, which is P4/n=160kPa/2.5=64kPa;

The range of the fifth pressure module P5 should be selected as the next range of the tested meter that is less than 64kPa (P4/n=160kPa/2.5=64kPa), that is, P5=60kPa; The range that the fifth pressure module P5 can cover to the tested meter is P5/n=60kPa/2.5=24kPa;

The range of the sixth pressure module P6 should be selected as the next range of the tested meter that is less than 24kPa (P5/n=60kPa/2.5=24kPa), that is, P6=10kPa; The sixth pressure module P6 can cover the range of the tested meter, which is P6/n=10kPa/2.5=2.4kPa;

The range of the seventh pressure module is P7, and the final selection is -100kPa, P7=-100kPa.

Select the appropriate module from high to low according to the above module selection method, and then match it with the CPC2000 series pressure calibrator based on needs and usage habits.