Pressure transmitter capable of outputting 0-5V

Abstract

The utility model belongs to the technical field of sensors, and particularly relates to a pressure transmitter capable of outputting 0-5V. By adopting the NSA2860X signal conditioning chip and combining with the differential filter circuit, the problem of nonlinear error caused by two-point calibration limitation of a traditional pressure transmitter is effectively solved, and meanwhile, the output precision is improved. Comprising a direct-current power supply unit, a power supply protection unit, a secondary power supply unit, a signal processing unit, a signal sampling unit and a voltage transmitting unit, wherein the direct-current power supply unit is used for providing a direct-current power supply for a circuit system; the power supply protection unit is connected with the direct-current power supply unit, the secondary power supply unit is connected with the power supply protection unit, the signal processing unit is connected with the secondary power supply unit, and the signal processing unit comprises an NSA2860X signal conditioning chip; the signal sampling unit is connected with the pressure core body and the signal processing unit, and the voltage transmitting unit is connected with the signal processing unit and used for outputting 0-5V voltage signals.

Description

Technical Field

[0001] This utility model belongs to the field of sensor technology, and in particular relates to a pressure transmitter with an output of 0~5V. Background Technology

[0002] A pressure transmitter is a device that converts pressure signals into electrical signals, used to detect the pressure of gases or liquids. A pressure transmitter includes: a DC power supply unit, a power protection unit, a secondary power supply unit, a signal processing unit, a signal sampling unit, and a voltage transmission unit. The DC power supply unit provides DC power to the circuit system. The power protection unit receives the DC power supply and, provided the protection circuit is functioning normally, the secondary power supply unit steps down the input DC power to the signal processing unit. The signal sampling unit collects the electrical signal output from the pressure core and transmits it to the signal processing unit. The signal processing unit controls the voltage transmission unit to output a 0-5V voltage signal based on the collected pressure and temperature signals.

[0003] Currently, most pressure transmitters use operational amplifiers to build conditioning circuits that output 0-5V. This type of circuit can only perform two-point calibration and cannot correct the nonlinearity of the pressure core. Moreover, when faced with a large range of ambient temperature variations, the temperature drift characteristics of the components can lead to excessive temperature drift, resulting in a decrease in the transmitter's output accuracy and poor compensation for the accuracy of the front-end core. Summary of the Invention

[0004] This invention addresses the shortcomings of existing technologies by providing a pressure transmitter with an output of 0~5V.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: a pressure transmitter with an output of 0~5V, comprising a DC power supply unit, a power protection unit, a secondary power supply unit, a signal processing unit, a signal sampling unit, and a voltage transmission unit, wherein:

[0006] The DC power supply unit is used to provide DC power to the circuit system;

[0007] The power protection unit is connected to the DC power supply unit, and the secondary power supply unit is connected to the power protection unit, which is used to step down the input DC power supply and output it to the signal processing unit.

[0008] The signal processing unit is connected to the secondary power supply unit, and the signal processing unit includes an NSA2860X signal conditioning chip.

[0009] The signal sampling unit is connected to the pressure core and the signal processing unit, and is used to collect the electrical signal output by the pressure core and transmit it to the signal processing unit.

[0010] The voltage transmitter unit is connected to the signal processing unit and is used to output a voltage signal of 0~5V.

[0011] Furthermore, the power supply unit includes TVS diode D3 and TVS diode D4. TVS diode D3 is connected in parallel between the power input terminal VCC1 and the ground line GND1, and TVS diode D4 is connected in parallel between the signal output terminal VOUT1 and the ground line GND1.

[0012] Furthermore, the power protection unit includes ferrite beads B1, B2, and B3, capacitor C10, and Schottky diode D2; wherein, Schottky diode D2 is connected in series on the power line for reverse connection protection; ferrite bead B1 is connected in series on the power line, ferrite bead B2 is connected in series on the ground line, and ferrite bead B3 is connected in series on the signal line for suppressing high-frequency noise; wherein, one end of ferrite bead B1 is connected to the anode of Schottky diode D2, and the other end of ferrite bead B1 is connected to the power input terminal VCC1; one end of capacitor C10 is connected to the power ground, and the other end of capacitor C10 is connected to the metal casing of the transmitter; capacitor C10 is also connected in parallel with resistor R7.

[0013] Furthermore, the secondary power supply unit includes a depletion-type NMOS transistor Q1, a Zener diode D1, and a capacitor C2. The gate of the depletion-type NMOS transistor Q1 is connected to the VGATE pin of the signal processing unit to control the conduction state and achieve voltage reduction. The drain of the depletion-type NMOS transistor Q1 is connected to the VCC terminal of the power protection unit. The Zener diode D1 is connected between the source of the NMOS transistor Q1 and ground. The upper end of the capacitor C2 is connected to the VDDHV pin of the signal processing unit, and the lower end of the capacitor C2 is grounded to filter out power supply noise.

[0014] Furthermore, the signal sampling unit includes a differential filter circuit composed of capacitors C8, C9, and C11, used to filter noise in the pressure core signal; wherein, one end of capacitor C11 is connected to the first differential signal line of the pressure core through resistor R6, and the other end of capacitor C11 is grounded; one end of capacitor C8 is thermally connected to the second differential signal line of the pressure core through a resistor, and the other end of capacitor C8 is grounded; capacitor C9 is connected across the first differential signal line and the second differential signal line to suppress common-mode noise; and both ends of capacitor C9 are also connected to the signal processing unit.

[0015] Furthermore, the voltage transmission unit includes resistors R2 and R4. Resistor R2 has a resistance of 220Ω and is used to match the output impedance of the operational amplifier inside the signal processing unit. Resistor R4 and resistor R2 form an output negative feedback loop for negative feedback regulation of the output voltage. One end of resistor R2 is connected to pin 12 of the NSA2860X signal conditioning chip, and the other end of resistor R2 is connected to the VOUT terminal of the power protection unit. One end of resistor R4 is connected to pin 11 of the NSA2860X signal conditioning chip, and the other end of resistor R4 is connected to the VOUT terminal of the power protection unit.

[0016] Furthermore, the VDDHV pin of the signal conditioning chip NSA2860X in the signal processing unit is connected to the output of the secondary power supply unit to receive 5.3V power supply, the differential signal input of NSA2860X is connected to the signal sampling unit to receive the electrical signal of the pressure core, and the output of NSA2860X is connected to the voltage transmitter unit to output a 0~5V voltage signal.

[0017] Compared with the prior art, this utility model has the following advantages.

[0018] This invention employs the NSA2860X signal conditioning chip, which integrates a digital compensation algorithm to perform multi-point calibration and correction of the nonlinear characteristics of the pressure core (instead of traditional two-point calibration), thereby improving signal linearity. Furthermore, this chip, combined with a differential filtering circuit, effectively solves the nonlinear error problem caused by the two-point calibration limitation of traditional pressure transmitters, while simultaneously improving output accuracy.

[0019] The design of the power protection unit and secondary power supply unit in this invention enhances the circuit's anti-interference capability and stability. The combined use of TVS diodes, ferrite beads, and Schottky diodes effectively suppresses surges, high-frequency noise, and the risk of reverse power connection, ensuring system reliability. Furthermore, the voltage transmitter unit further optimizes the linearity and accuracy of the output voltage through negative feedback regulation, enabling the transmitter to stably output a high-precision signal of 0~5V even in complex environments. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. The scope of protection of the present invention is not limited to the following description.

[0021] Figure 1 This is a block diagram of the overall structure of the pressure transmitter in a specific embodiment.

[0022] Figure 2 This is a specific embodiment of the overall circuit diagram of the pressure transmitter system.

[0023] Figure 3 yes Figure 2 Enlarged schematic diagrams of parts a and b.

[0024] Figure 4 yes Figure 2 Enlarged schematic diagrams of parts c, d, and f.

[0025] Figure 5 yes Figure 2 A magnified view of part e. Detailed Implementation

[0026] To make the objectives, technical solutions, and beneficial effects of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0027] like Figure 1-5 As shown in the specific embodiment: A pressure transmitter with an output of 0~5V includes a DC power supply unit (a), a power protection unit (b), a secondary power supply unit (c), a signal processing unit (d), a signal sampling unit (e), and a voltage transmission unit (f), wherein: the DC power supply unit (a) is used to provide DC power to the circuit system; the power protection unit (b) is connected to the DC power supply unit (a), and is used to receive the DC power and, after protection, to safely transmit the DC power to the secondary power supply unit (c); the secondary power supply unit (c) is used to step down the input DC power and output it to the signal processing unit (d); the signal processing unit (d) includes an NSA2860X signal conditioning chip, as well as capacitors and resistors, and is used to digitally compensate for the nonlinearity and temperature drift of the pressure core (through an algorithm); the signal sampling unit (e) is connected to the pressure core, filters the analog signal output by the pressure core, and transmits it to the signal processing unit (d); the signal processing unit (d) processes the received analog signal output by the pressure core into a digital signal, performs digital compensation, and then transmits it to the voltage transmission unit (f) to output a 0~5V analog voltage signal.

[0028] Preferably, the power supply unit (a) includes TVS diodes D3 and D4. TVS diode D3 is connected in parallel between the power input terminal VCC1 and the ground line GND1, and TVS diode D4 is connected in parallel between the signal output terminal VOUT1 and the ground line GND1. The working principle of the power supply unit (a) is as follows: the VCC1 terminal is used to connect to the positive input of the power supply, and the GND1 terminal is used to connect to the negative input of the power supply. When a surge or voltage spike occurs on the power line, TVS diodes D3 and D4 will conduct momentarily, guiding the interference source into the ground line to prevent it from entering subsequent circuits and causing interference and damage.

[0029] Preferably, the power protection unit (b) includes ferrite beads B1, B2, and B3, capacitor C10, and Schottky diode D2; wherein, Schottky diode D2 is connected in series on the power line for reverse connection protection; ferrite bead B1 is connected in series on the power line, ferrite bead B2 is connected in series on the ground line, and ferrite bead B3 is connected in series on the signal line for suppressing high-frequency noise; wherein, one end of ferrite bead B1 is connected to the anode of Schottky diode D2, and the other end of ferrite bead B1 is connected to the power input terminal VCC1; one end of capacitor C10 is connected to the power ground, and the other end of capacitor C10 is connected to the metal casing of the transmitter; capacitor C10 is also connected in parallel with resistor R7.

[0030] The power protection unit works as follows: when high-frequency noise passes through the ferrite bead, the bead maintains a high impedance, thus filtering out the noise. Furthermore, utilizing the unidirectional conduction characteristic of a diode (current can only flow from the anode to the cathode), the diode is cut off and does not conduct when a reverse power supply is applied, effectively breaking the circuit and preventing current from flowing, thus achieving reverse connection protection. Additionally, utilizing the DC blocking and AC passing characteristics of a capacitor, one end of capacitor C10 is grounded. The capacitor forms a high-frequency path, and high-frequency interference generated inside the circuit board will pass through the capacitor and the metal casing to ground, preventing antenna radiation caused by high-frequency interference.

[0031] Preferably, the secondary power supply unit (c) includes a depletion-type NMOS transistor Q1, a Zener diode D1, and a capacitor C2. The gate of the depletion-type NMOS transistor Q1 is connected to the VGATE pin of the signal processing unit (d) to control its conduction state for voltage reduction. The drain of the depletion-type NMOS transistor Q1 is connected to the VCC terminal of the power protection unit. The Zener diode D1 is connected between the source of the NMOS transistor Q1 and ground. The upper end of the capacitor C2 is connected to the VDDHV pin of the signal processing unit (d), and the lower end of the capacitor C2 is grounded to filter power supply noise. The secondary power supply operates as follows: The VGATE pin of the NSA2860 chip has a built-in operational amplifier that can be connected to the gate of an external MOS transistor to form an LDO power supply. The conduction level of the MOS transistor is controlled through the VGATE pin to obtain a suitable secondary power supply. The Zener characteristic of the Zener diode D1 clamps the 24V voltage to 5.6V for initial power-on to provide power to the chip.

[0032] Preferably, the signal sampling unit (e) includes a differential filter circuit composed of capacitors C8, C9, and C11 for filtering noise in the pressure core signal; wherein, one end of capacitor C11 is connected to the first differential signal line of the pressure core through resistor R6, and the other end of capacitor C11 is grounded; one end of capacitor C8 is thermally connected to the second differential signal line of the pressure core through a resistor, and the other end of capacitor C8 is grounded; capacitor C9 is connected across the first differential signal line and the second differential signal line to suppress common-mode noise; and both ends of capacitor C9 are also connected to the signal processing unit. The +V terminal of the signal sampling unit (e) is connected to the positive excitation terminal of the pressure core, and the GND terminal is connected to the negative excitation terminal of the pressure core, which is used to provide constant current power to the pressure core; the +S terminal is connected to the differential signal + of the pressure core, and the -S terminal is connected to the differential signal - of the pressure core; after the pressure core deforms, it squeezes the internal resistor bridge, causing its resistance value to change. Under constant current power supply conditions, according to the formula: voltage V = current I × resistance R, the voltage signal across the resistor changes. The high-frequency signal interference is attenuated by the low-pass filter composed of resistors R6 and C11, and R5 and C8, and common-mode interference is suppressed by capacitor C9. Finally, the differential signal is transmitted to the VIP and VIN pins of the NSA2860X chip for ADC acquisition.

[0033] Preferably, the voltage transmitter unit (f) includes resistors R2 and R4. Resistor R2 has a resistance of 220Ω and is used to match the output impedance of the operational amplifier inside the signal processing unit (d). Resistor R4 and resistor R2 form an output negative feedback loop for negative feedback regulation of the output voltage. One end of resistor R2 is connected to pin 12 of the NSA2860X signal conditioning chip, and the other end of resistor R2 is connected to the VOUT terminal of the power protection unit. One end of resistor R4 is connected to pin 11 of the NSA2860X signal conditioning chip, and the other end of resistor R4 is connected to the VOUT terminal of the power protection unit. The NSA2860X chip can output a voltage value of 0~5V through the VOUT pin. A resistor R2 is connected in series at the output terminal of the VOUT pin to prevent output short circuit. The right end of R2 is introduced into the feedback loop, and resistor R4 is connected in series in this feedback loop. By changing the value of R4, the amplification factor of the output is changed, thereby adjusting the output value.

[0034] Preferably, the VDDHV pin of the signal conditioning chip NSA2860X of the signal processing unit (d) is connected to the output of the secondary power supply unit (c) to receive 5.3V power supply, the differential signal input terminal (pins 2 and 3) of NSA2860X is connected to the signal sampling unit (e) to receive the electrical signal of the pressure core, and the output terminal (pin 12) of NSA2860X is connected to the voltage transmitter unit (f) to output a 0~5V voltage signal.

[0035] The NSA2860X signal conditioning chip features a 24-bit high-precision ADC and a 1~256x instrumentation amplifier at its signal sampling end. It can linearly amplify the millivolt signal output from the pressure transmitter and then send it to the 24-bit ADC data acquisition unit. After the data is calibrated and calculated by the program burned into the chip, it can output a 0~5V analog signal.

[0036] Working principle of this utility model:

[0037] 1. When there is a surge or static electricity at the input terminal, if the voltage is higher than 33V, the TVS diode D2 will conduct and introduce part of the energy into the ground line to protect the subsequent circuit. When the voltage on the signal line is greater than 5.3V, the TVS diode D4 will conduct and release the energy into the ground line, and the energy voltage will be suppressed to about 5.3V.

[0038] 2. The Zener voltage of Zener diode D1 is 5.6V. When the NMOS transistor is working normally, the voltage at its source is 5.3V, which supplies power to the conditioning chip. Since the 5.3V voltage is less than the reverse breakdown voltage of the Zener diode, the Zener diode is cut off and does not work. However, when the NMOS transistor Q1 is short-circuited, its power supply voltage is directly applied to the Zener diode D1. At this time, the voltage applied to the cathode of the Zener diode is greater than the Zener voltage, and the Zener diode D1 conducts, clamping the voltage at 5.6V, thereby protecting the conditioning chip.

[0039] 3. Schottky diode D2 has unidirectional conductivity. The cathode can withstand a voltage of 100V. When the standard working power supply is reversed, diode D2 will not conduct. At this time, the circuit is in an open circuit state to prevent reverse connection.

[0040] 4. The ferrite bead B1 has the ability to suppress noise, and the capacitor 11 has the characteristics of energy storage and DC blocking and AC passing. When noise / surge enters, high-frequency noise will be suppressed by the ferrite bead, low-frequency noise will be absorbed by the capacitor 11, and surge will be conducted to the casing through the capacitor, which can realize EMC protection function.

[0041] 5. Capacitor C11, along with capacitors C8 and C9, forms a differential filter to filter noise on the differential lines, making the chip's reading of the pressure core signal more stable and accurate. Resistor R2 is used to match the output impedance, and its resistance of only 220 ohms has minimal impact on the output voltage. Resistor R2 and R4 form an output negative feedback loop, allowing the chip to negatively regulate the linear output voltage to ensure its accuracy. The combination of these two points makes the transmitter maintain more stable accuracy.

[0042] 6. Component and parameter descriptions in the circuit diagram:

[0043] [1] The NSA2860X chip is a signal conditioning chip that can digitally compensate for the nonlinearity and temperature drift of the front-end pressure core through algorithms.

[0044] [2] VCC1 and GND1 are power input terminals, and OUT1 is a signal output terminal.

[0045] [3] TVS diode D3 is used for surge protection. When power supply noise and other interference exceed the rated value, they are conducted to the ground. TVS diode D4 is used to protect the output of the signal line and prevent current from flowing back into the circuit from the signal line and causing damage.

[0046] [4] The ferrite beads B1, B2 and B3 connected in series on the power line, ground line and signal line are all 1KΩ@100MHz, which together with the TVS tube at the front end form EMC protection to suppress high frequency noise in the circuit.

[0047] [5] The upper end of capacitor C10 is connected to the power supply ground, and the lower end is connected to the metal shell of the transmitter. This can release low-frequency noise interference to the outside world and thus avoid interference with the circuit.

[0048] [6] The Schottky diode D2 is connected in series on the power line to prevent reverse connection.

[0049] [7] The depletion-type NMOS transistor Q1 is model DMZ12C15A. Its gate is connected to the VGATE pin of the chip to control the conduction state of the NMOS transistor and thus achieve voltage reduction. Its source is connected to Zener diode D1. Capacitor C2 is connected in parallel after Zener diode. When the NMOS transistor is short-circuited, Zener diode 5 will stabilize the voltage at 5.6V to protect the conditioning chip. The upper end of capacitor C2 is connected to the VDDHV pin of the chip, and the lower end is grounded to filter out the noise generated after the power supply passes through the NMOS voltage drop.

[0050] [8] Capacitor C11, along with capacitors C8 and C9, forms a differential filter circuit to filter out noise in the core signal.

[0051] [9] Resistor R3 has a resistance of 0Ω and is used as a jumper to facilitate the selection of constant voltage / constant current power supply mode.

[0052]

[10] Resistor R8 is a low temperature drift resistor used as an external reference resistor to reduce the temperature drift of the constant current source.

[0053]

[11] The resistance of resistor R2 is 220 ohms, which is used to match and condition the output impedance of the internal operational amplifier of the chip and eliminate the interference caused by the external capacitive load.

[0054] The NSA2860X chip of this invention integrates a temperature sensor that can read temperature values ​​under different pressure calibration environments. Using this function, when calibrating the pressure sensor, the sensor can be calibrated at three temperature points: low temperature, normal temperature, and high temperature. At the same time, the ADC collects the digital value of the current temperature. The offset of the pressure core output at these three temperatures is linearly processed and stored in the chip. The output value of the transmitter is then corrected in real time through a compensation algorithm to achieve temperature compensation.

[0055] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "preferred embodiment," "detailed description," or "preferred embodiment," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0056] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Therefore, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope defined by the claims of this utility model.

Claims

1. A pressure transmitter outputting 0-5V, characterized in that, It includes a DC power supply unit, a power protection unit, a secondary power supply unit, a signal processing unit, a signal sampling unit, and a voltage transmission unit, wherein: The DC power supply unit is used to provide DC power to the circuit system; The power protection unit is connected to the DC power supply unit, and the secondary power supply unit is connected to the power protection unit, which is used to step down the input DC power supply and output it to the signal processing unit. The signal processing unit is connected to the secondary power supply unit, and the signal processing unit includes an NSA2860X signal conditioning chip. The signal sampling unit is connected to the pressure core and the signal processing unit, and is used to collect the electrical signal output by the pressure core and transmit it to the signal processing unit. The voltage transmitter unit is connected to the signal processing unit and is used to output a voltage signal of 0 to 5V.

2. The pressure transmitter outputting 0-5V according to claim 1, characterized in that, The power supply unit includes TVS diodes D3 and D4. TVS diode D3 is connected in parallel between the power input terminal VCC1 and the ground line GND1, and TVS diode D4 is connected in parallel between the signal output terminal VOUT1 and the ground line GND1.

3. The pressure transmitter outputting 0-5V according to claim 1, characterized in that, The power protection unit includes ferrite beads B1, B2, and B3, capacitor C10, and Schottky diode D2. Schottky diode D2 is connected in series on the power line for reverse connection protection. Ferrite bead B1 is connected in series on the power line, ferrite bead B2 is connected in series on the ground line, and ferrite bead B3 is connected in series on the signal line to suppress high-frequency noise. One end of ferrite bead B1 is connected to the anode of Schottky diode D2, and the other end of ferrite bead B1 is connected to the power input terminal VCC1. One end of capacitor C10 is connected to the power ground, and the other end of capacitor C10 is connected to the transmitter's metal casing. Capacitor C10 is also connected in parallel with resistor R7.

4. The 0-5V pressure transmitter of claim 1, wherein, The secondary power supply unit includes a depletion-type NMOS transistor Q1, a Zener diode D1, and a capacitor C2. The gate of the depletion-type NMOS transistor Q1 is connected to the VGATE pin of the signal processing unit to control the conduction state and achieve voltage reduction. The drain of the depletion-type NMOS transistor Q1 is connected to the VCC terminal of the power protection unit. The Zener diode D1 is connected between the source of the NMOS transistor Q1 and ground. The upper end of the capacitor C2 is connected to the VDDHV pin of the signal processing unit, and the lower end of the capacitor C2 is grounded to filter out power supply noise.

5. The 0-5 V output pressure transmitter of claim 1, wherein, The signal sampling unit includes a differential filter circuit composed of capacitors C8, C9, and C11, used to filter noise in the pressure core signal. One end of capacitor C11 is connected to the first differential signal line of the pressure core through resistor R6, and the other end of capacitor C11 is grounded. One end of capacitor C8 is thermally connected to the second differential signal line of the pressure core through a resistor, and the other end of capacitor C8 is grounded. Capacitor C9 is connected across the first and second differential signal lines to suppress common-mode noise. Both ends of capacitor C9 are also connected to the signal processing unit.

6. The 0-5 V output pressure transmitter of claim 1, wherein, The voltage transmitter unit includes resistors R2 and R4. Resistor R2 has a resistance of 220Ω and is used to match the output impedance of the operational amplifier inside the signal processing unit. Resistor R4 and resistor R2 form an output negative feedback loop for negative feedback regulation of the output voltage. One end of resistor R2 is connected to pin 12 of the NSA2860X signal conditioning chip, and the other end of resistor R2 is connected to the VOUT terminal of the power protection unit. One end of resistor R4 is connected to pin 11 of the NSA2860X signal conditioning chip, and the other end of resistor R4 is connected to the VOUT terminal of the power protection unit.

7. The 0-5 V output pressure transmitter of claim 1, wherein, The VDDHV pin of the signal conditioning chip NSA2860X in the signal processing unit is connected to the output of the secondary power supply unit to receive 5.3V power. The differential signal input of NSA2860X is connected to the signal sampling unit to receive the electrical signal from the pressure core. The output of NSA2860X is connected to the voltage transmitter unit to output a 0-5V voltage signal.

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