Product manual

SPECIFICATION

• 1、Product Introduction

  The working principle of a micro pressure differential transmitter is that the pressure of the medium directly acts on the diaphragm of the sensor, causing the diaphragm to produce a micro displacement proportional to the pressure of the medium, causing a change in the resistance of the sensor. This change is detected by electronic circuits, and a standard signal corresponding to this pressure is converted and output.

  This product uses imported integrated chips, with wide voltage power supply, strong anti-interference ability, reverse connection protection, high accuracy, good stability, and can be manually corrected to zero.

  Micro pressure differential transmitter obtains the pressure difference between air and non corrosive gases, suitable for various industrial self-control environmental fields such as HVAC, dust-free and clean workshops, pipeline air supply, boiler negative pressure, oven pressurization, ventilation equipment, fan control, variable air volume systems, etc.

   

  2、Introduction to product components

  

   

  3、Model and Description

  

  4、Connection

   

  

  5、Product characteristics

  1. Linear pressure characteristics and selectable pressure measurement ranges

  2. Working voltage: 16-30VDC

  3. Signal output: 4-20mA/0-5V/0-10V/RS485 type

  4. zero adjustment

  5. Simple and fast installation brought by the integrated bracket inside the casing

  6. Calibration and temperature compensation measurement signals

   

  6、application area：

  1. Measure the subtle pressure difference in ventilation equipment and air conditioning ducts

  2. Check air flow rate

  3. Monitoring filters and controlling fans

   

  7、Model summary

  unit：Pa

  Product series	product name	Pressure range measurement
  		measuring range 1	measuring range 2	measuring range 3	measuring range 4	Overload pressure	Overload pressure
  BPS-01	100Pa Micro pressure differential transmitter	±50Pa	-	±65Pa	±100Pa	±10Kpa	±20Kpa
  BPS-02	1KPa Micro pressure differential transmitter	±250Pa	-	±500Pa	±1Kpa	±10Kpa	±20Kpa
  BPS-03	10KPa Micro pressure differential transmitter	±2KPa	±3KPa	±5KPa	±10KPa	±85Kpa	±110Kpa
  BPS-04	35Kpa Micro pressure differential transmitter	±30KPa	±35KPa	-	-	±175Kpa	±280Kpa

   

  8、Operating mode

  The sensor obtains the pressure difference through a silicon piezoresistive element, which forms a linear 4-20mA/0-5V/0-10V/RS485 temperature compensation output signal through the sensed deviation value。

   

  9、machine design

  The micro differential pressure transmitter consists of the following components：

  1. Sensor housing fixing bracket, cable entry, movable buckle with safety screws for pressing

  2. Force measurement using silicon piezoresistive elements

  3. Printed circuit board with wiring terminals and DIP switch for selecting measurement range (see debugging precautions)

  4. Zero adjustment button (see debugging precautions)

   

  10、Debugging precautions

  Adjustable measurement range: pressure range and direction, adjustable through a toggle switch

  

  Zero point adjustment: clearing and calibration

  Open the panel and press the zero adjustment button briefly (within 1 second) to reset it.

  (Please manually reset while parallel to the installation method; please manually reset while the positive and negative air intakes are connected.)

   

  Operation steps	state	result	key
  1. PCB power on 2. Keep the positive and negative pressure inlet pressure difference at zero 3. Click the 0 button	Red light on	0 point calibration

   

   

  11、Technical Parameter

  Technical Parameter：

  measuring range	Refer to "Model Summary"
  Sensing element	Silicon piezoresistive element
  Room temperature	Measurement during correct installation at 20-25 ℃ (FS=full range measurement)
  Precision: Total Error Temperature offset	± 1 % /± 0.5 % / ±0.2% FS <±0.1% FS /°C
  medium	Air and non corrosive gases
  Permissible medium temperature range	-20-85℃
  maintenance	long term stability

  Electrical characteristics：

  All output types	power supply	safety extra low voltage
  	voltage power dissipation	DC16-30V <1.5 VA
  4-20mA type of output	output current	4-20 mA
  	load	≤250 Ω
  	output	Non electric separation, non-polar two wire connection, rectifier bridge anti reverse connection

  link：

  Electrical connections
  screw terminal	Maximum 1.5mm ² cable
  cable	Cable sealing gland (without anti cable deformation)
  Pressure connection	Pressure nozzle, 6.21 mm diameter

   

  ambient condition：

  Permissible ambient temperature
  run	-20-85℃
  Transportation/Storage	-40-125 ℃
  Permissible environmental humidity	<90 % rh (No condensation)

   

  12、Appearance dimensions (length * width * height: 99.0 * 101.5 * 39.9mm, tolerance: ± 1mm)

  

   

  13、Installation method

   

• First, use a ruler on the back to mark the installation hole position on the wall, drill a 30mm deep Ø 6mm wall hole to place the expansion pipe, then open the micro pressure differential transmitter buckle and flip over the cover

• Cover and tighten the self tapping screw (ST3.5 × 25) Fix the micro pressure differential transmitter to the designated position on the wall through the fixing hole, connect the incoming and outgoing wires through the waterproof joint, and finally cover it with a cover.

• Attention:

• No air duct connection device is provided during supply;

• Please carefully read the manual and follow the wiring diagram for operation. If the product is damaged due to wiring reasons, it cannot be guaranteed.