Differential air pressure sensor with a 10 volt or a 4-20mA output for building ventilation applications. Designed for incorporating into a building HVAC management system to monitor and control the distribution of warm or cool air through ventilation ducts. Pressure ranges from 0 to 6 mbar up to 0 to 1000 mbar differential.
- Pressure Ranges: 600 Pa (6mb) to 100 kPa (1 bar) differential
- Accuracy: 1% FS BSL
- Output Signals: 3 wire 0-10V, 2 or 3 wire 4-20mA, 3 wire 0-20mA
- Electrical Connection: M12 x1.5 cable gland with 5 internal screw terminals
- Pressure Connections: 6.6mm dia x 11mm for 6mm dia tubing, 4.4mm x 11mm for 4mm dia flexible tubing
- Media Compatibility: Air
- Environmental Protection: IP54
- Dimensions: 131 x 68 x 51 mm
- Weight: approx. 165g
- Special Options: Integrated LCD display, bargraph indicator
The DPS 200 ventilation air dp sensor has been designed particularly for measuring draft air pressures in ranges that are typically used in air condition systems for office blocks and factories to monitor airflow.
The DPS200 hvac differential pressure sensor is housed inside a ABS plastic box which can be mounted on the wall or inside an instrument cabinet. An LCD display can be integrated into the front cover of the sensor housing for local indication of the air pressure.
The LCD display can be configured in the factory for reading the pressure in any units such as inches of water, millibar or pascals. The lower portion of the display shows the units the sensor is calibrated to measure and a 52 segment bargraph shows the reading a percentage of the full scale range.
Push-on flexible tube fittings and a M12 x 1.5 cable gland are fitted as standard for installing pressure hoses and electrical wiring connections.
2 or 3 wire 4 to 20 milliamp can be specified for industrial process plant control systems or 0 to 10 volt for commercial building utility management systems.
Bubbler pressure sensor for measuring tank volumes
Bubbler systems are used to measure the tank contents when the media presents difficulties for other types of measurement technology, such as highly viscous liquids. The DPS 200 is mounted away from the liquid contents, typically at the top of the tank along with a pressurised air supply and regulator to control air flow. The applied air pressure is fed via a tube to the bottom of the tank where it is increased until it equalises with the hydrostatic pressure of the liquid contents in the tank. The regulator controls a steady flow of air through the liquid, hence the term bubbler system. As the liquid contents rise and fall, the bubbler pressure will automatically increase and decrease to maintain the same air flow, in order to compensate for the changes in hydrostatic pressure. The change in bubbler air pressure measured by the DPS 200 will be proportional to the change in liquid level. The liquid level can then be converted into a volume measurement using the dimensions of the tank, and the tank contents determined.
- SKU ID: s1-dps200-18-28066
- Pressure Range: 0 – 1000
- Units: mbar
- Range Type: Differential (0 to +P)
- Output Signal: 4 – 20mA, 2-wire
- Accuracy: 1% full scale
- Electrical Connection: M12 x1.5 cable gland with internal screw terminals
- Process Connection: 6.6 x 11 mm tube
- Media Compatibility: Air and non-corrosive gases
Measuring negative pressure using a positive range
I read this product can read “negative pressure” but when I read the pressure range is from 0 to 20 kPa. As 0 to 20 is a positive range, does it means that this product can measure from -20 to 0 kPa, or from -20 to 20 kPa?
It will measure 0 to -20 kPa. To measure negative pressure it is simple matter of switching the connections to the positive and negative ports, to reverse the measurement. This is one of the benefits of using a differential type pressure sensor, they can work in the positive or the negative direction without re-calibration.
Flex type connection spec explanation
From the part number configurator I read 2 standard options for the mechanical connections: Ø6.6 x 11 (for flex. tubes Ø6), or Ø445 x 10 (for flex. tubes Ø4). I don’t understand exactly the second one, it looks like there is an internal diameter of 445 mm and an external of 10 mm?
Ø445 – refers to an outer diameter (OD) of 4.45mm or widest dimension of the push-on barbed connector.
x 10 – refers to the length of the connector which is 10 mm long, or the length of tube needed to push onto the connector.
for flex. tubes Ø 4 – refers to the ideal ID of the tubing being 4 mm, and you can use smaller, but it all depends on the flexibility of the tube material.
2 wire 4-20mA output power requirements
What is the power requirement for the 2 wire 4-20mA output version of this sensor, 240Vac, 12 or 24Vdc?
The 2 wire 4-20mA loop can be powered by any voltage between 11 and 32 volts dc. We would recommend a 24 Vdc supply, but 12 Vdc will work also if there is minimal additional load of no more than 50 Ohms.
Inverting tube connections to measure negative or positive ressure
I imagine that if I invert the tube the product measure the negative or the positive pressure, am I right?
Yes just switch the tubes, a very simple solution to measure negative pressure with a dp sensor.
Output signal response
On the DPS200 data sheet, it says that the response time can be adjusted from 500 msecs to 2.5 secs, and it also says that the measuring rate is 1 kHz, please could you explain which spec should be used to determine the response of the output signal?
The Response time is after the averaging and filtering has been applied. The measuring rate is the speed at which the sensing element is measured by the signal conditioning inside the DPS200 before the averaging and filtering processes. A faster measuring rate allows the collection of more data, which leads to a more accurate output reading after conditioning.
Are bi-directional ranges possible with the DPS200 HVAC differential pressure transducer?
Yes it is possible to scale the electrical signal output over a combined negative and positive pressure range, e.g. -1000 Pa = 0 volts dc and +1000 Pa = 10 Volts dc.
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