working principle: The measured pressure is converted into a capacitance variable by
a capacitive sensitive element, directly converted into a digital
signal by the A/D circuit, and sent to the microprocessor after
conversion. To display/adjust the instrument or DCS and other
devices. The communication line converts the measured pressure
digital signal from the microprocessor into a frequency signal and
superimposes it on the 4-20mADC analog signal, which is received by
the corresponding HART terminal equipment. Features: ·High stability and reliability The high-sensitivity
pressure-sensitive element is a fully sealed design, and the stress
isolation structure and overvoltage self-protection ensure the
stability and reliability of the sensitive element. ·Automatic
compensation function The correction coefficients of pressure and
temperature characteristics stored in the EEPROM are used for the
main control unit microprocessor to perform linear and temperature
automatic compensation, so that the 3151 intelligent transmitter
has high precision and little influence of temperature. ·Digital
communication, data storage HART Communicator communication enables
remote setting, monitoring and diagnosis. And the set configuration
data is stored in the non-volatile EEPROM of the circuit board, and
these data will not be lost after the power is turned off. Power
cycle the transmitter to resume operation immediately. The
five-digit LCD indicator can display the digital reading of the
measured pressure (including engineering units, such as: kPa,
kgf/cm, mbar, mmH2O, etc.), the percentage of the range (%) and the
output current (mA). ·Configuration protection In order to prevent the configuration data
of the transmitter from being changed arbitrarily, the stored data
can be locked through the protection switch. ·Local zero and span adjustment The S and Z buttons of the main
control unit are used by the user to adjust the zero point and span
of the transmitter without a configuration device. ·Explosion-proof
mark The explosion-proof type of the instrument includes intrinsic
safety (Ex ia IIC T5) and flameproof type (Ex d IIC T5), both of
which have passed the national explosion-proof standard
certification. · Strong interchangeability of parts Regardless of
the range and output form, the flanges, joints, electrical
housings, display heads, end caps and mounting brackets can be
interchanged, the smart circuit boards can also be interchanged,
the sensors can also be interchanged, and can also be changed by
replacing the sensor. measuring range, but recalibration is also
required after replacement.
