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The specified technical parameters (current, power, etc.) represent maximum allowable values under ideal operating conditions. For safe use and optimal lifespan, it is recommended to operate the product continuously at no more than 50% of the specified maximum values.
Vacuum pressure sensor
The MD-PS002 vacuum pressure sensor is ideal for monitoring pressure in projects with Arduino and other development boards, offering measurement from absolute vacuum up to 150 kPa. It operates at 5VDC, is easy to integrate into industrial and electronic applications, and is suitable for control, automation, and testing in pneumatic systems.
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The MD-PS002 pressure sensor is a compact piezoresistive Wheatstone bridge transducer based on MEMS technology, designed for the precise measurement of absolute pressure in air and non-corrosive gases.
The sensing element is a silicon chip mounted on a ceramic base with a protective coating, integrated on a 6.8 x 6.8 mm square PCB, with 6 SMD pads and an internal bridge architecture that ensures high sensitivity and long-term stability. The sensor covers a measurement range of 0-150 kPa (absolute pressure), from vacuum (zero absolute pressure) up to 50 kPa above atmospheric pressure, equivalent to approximately 15 PSI.
It can be used both for vacuum measurement (-100 kPa) and for positive pressures or on a compound scale (simultaneous positive and negative detection). The output is a differential analog mV signal, with an amplitude of 50-100 mV at full scale depending on the supply voltage, provided between the Output+ and Output- pins.
The recommended supply is 5 VDC (maximum 10 VDC) or a constant current of 1 mA, and the accuracy is 0.3% FS with a hysteresis of 0.7% FS.
The sensor is compatible with Arduino, ESP32, ESP8266, STM32 and Raspberry Pi platforms, but due to the low-level output signal (mV), it is necessary to use an instrumentation amplifier (INA128, INA226) or a precision ADC module such as HX711 between the sensor and the microcontroller analog input.
The application range is broad: in the automotive field it is used for tire pressure calibrators, air pumps, MAP sensors and suspension systems. In industry it is used in pressure switches, pneumatic braking systems, leak detection and portable pressure gauges. In the medical field it appears in blood pressure monitors and diagnostic equipment. In altimetry applications and weather stations it allows estimation of relative altitude based on variations in atmospheric pressure.
Specifications:
Supply: 5 VDC recommended, maximum 10 VDC or constant current 1 mA
Measurement range: 0-150 kPa (absolute pressure)
Minimum measurable pressure: vacuum (zero absolute pressure / -100 kPa)
Maximum measurable pressure: 50 kPa above atmospheric pressure
Imperial equivalent: ~15 PSI
Scale type: compound (positive and negative pressure)
Output: differential analog mV signal
Output voltage at full scale: 50-100 mV (depending on supply voltage)
Accuracy: 0.3% FS
Hysteresis: 0.7% FS
Input impedance: 4-6 kΩ
Output impedance: 4-6 kΩ
Operating temperature: -40 ... +125 °C
Accessible medium: air and clean, dry, non-corrosive gases
Sensor type: Wheatstone piezoresistive bridge
Material: silicon chip on ceramic base with protective coating
Dimensions: 6.8 x 6.8 x 4.6 mm
Package: SMD 6 pads
Usage:
Solder the sensor pads to your own PCB or to an SMD adapter, ensuring solid electrical contact on all 6 pins.
Connect Pin 1 to circuit ground (GND) and Pin 3 to a stabilized 5 VDC supply or to a 1 mA constant-current source.
Leave Pin 5 and Pin 6 unconnected.
Connect Pin 2 (Output+) to the non-inverting input and Pin 4 (Output-) to the inverting input of an instrumentation amplifier (INA128, INA226) or to the corresponding inputs of an HX711 module.
Set the amplifier gain according to the desired range — for a 50 mV span and 0-5V output, a gain of about 100 is required.
Connect the amplifier output to the analog input of the development board (e.g. A0 on Arduino).
In code, read the ADC value and apply the conversion formula, taking into account the offset voltage and sensor sensitivity.
Calibrate the zero point at atmospheric pressure before first use for accurate differential measurements.
Make sure the pressure port is properly exposed to the medium being measured and that no corrosive gases or liquids are present.
Pinout:
| Pin | Name | Description |
|---|---|---|
| 1 | GND | Ground (0V) |
| 2 | Output + | Positive differential output (mV) |
| 3 | VCC | 5V supply |
| 4 | Output - | Negative differential output (mV) |
| 5 | N/C | Not connected |
| 6 | N/C | Not connected |
Produs destinat utilizarii in proiecte electronice, automatizari, prototipare, educatie si cercetare.
Produsul trebuie utilizat numai conform specificatiilor tehnice mentionate in descriere si/sau in documentatia produsului.
Avertismente generale de siguranta:
Nu utilizati produsul la tensiuni, curenti sau temperaturi peste valorile specificate.
Montajul si conectarea trebuie realizate de persoane cu cunostinte tehnice minime in domeniul electric/electronic.
Evitati scurtcircuitele, inversarea polaritatii si conectarea gresita a alimentarii.
Nu lasati produsul alimentat nesupravegheat in timpul testelor.
Produsul nu este jucarie si nu este destinat copiilor.
Pentru modulele electronice, se recomanda utilizarea in carcase, panouri sau montaje protejate, dupa caz.
Identificare produs:
Denumirea produsului, codul/SKU-ul si caracteristicile tehnice sunt mentionate in pagina produsului si/sau pe eticheta ambalajului.
Producator / Importator / Distribuitor:
Sigmanortec S.R.L.
Calea Bucuresti nr. 9, Targu Jiu, Gorj, Romania
E-mail: [email protected]
Website: www.sigmanortec.ro
Persoana responsabila in UE:
Sigmanortec S.R.L.
Calea Bucuresti nr. 9, Targu Jiu, Gorj, Romania
E-mail: [email protected]
Documentatie si siguranta:
Pentru informatii suplimentare, fise tehnice, declaratii de conformitate sau instructiuni, ne puteti contacta la [email protected].
// MD-PS002 pressure sensor test via HX711 amplifier module
// HX711 DOUT -> Arduino pin 3
// HX711 SCK -> Arduino pin 2
// Sensor Output+ -> HX711 A+
// Sensor Output- -> HX711 A-
// Sensor VCC -> 5V, Sensor GND -> GND
#include "HX711.h"
#define DOUT 3
#define SCK 2
HX711 scale;
void setup() {
Serial.begin(9600);
scale.begin(DOUT, SCK);
scale.tare(); // Zero at current (atmospheric) pressure
Serial.println("MD-PS002 ready. Zeroed at atmospheric pressure.");
}
void loop() {
if (scale.is_ready()) {
long raw = scale.read_average(5); // Average of 5 readings
Serial.print("Raw ADC value: ");
Serial.println(raw);
// Apply calibration factor here to convert to kPa
// Example: float pressure_kpa = raw / YOUR_CALIBRATION_FACTOR;
} else {
Serial.println("HX711 not ready.");
}
delay(500);
}
