The DPS 300 is a low range HVAC differential pressure sensor for measuring pressure drops across air filters and airflow through and between ventilation ducts. The lowest possible pressure range is 0…100 pascals and the highest is 0…1000 millibars. User switchable 2 or 3 pressure ranges and volts or current output are included with most standard configurations.
- Pressure Range: 100 Pa up to 1000 mb differential
- Output Signal: 3 wire switchable 0-5/10 Vdc, 0/4-20mA or 2 wire 4-20mA
- Accuracy: 0.5% FS 6mb and above, 1% below 6 mbar
- Electrical Connection: screw terminals via M16x1.5 cable gland
- Process Connection: 6.6 x 11 mm, 4.4 x 10 mm tube fitting
- Media Compatibility: PVC silicone tube, brass nickel plated, ceramic, silicone, epoxy, RTV
- Special Features: Switchable pressure ranges and output signal
- Special Options: Alarm relay switches, auto-zero, square root extraction, LCD display
This differential pressure sensor is purpose built for mounting on a wall or panel to measure air pressure differences in buildings as part of a air handling, BMS or HVAC system.
Each standard pressure range of 1.6, 4, 10, 40, 250, or 1000 mbar has one or two user selectable lower pressure ranges so that a number of dp sensors can stocked as spare and utilised for more than one pressure range.
The output signal can also be altered by the user to be either current or voltage output. As standard you can switch between 4 output configurations which include 0-5Vdc, 0-10Vdc, 4-20mA or 0-20mA. All of these output configurations are 3 wire, but you can also specify a non-switchable 2 wire 4-20mA version as well if necessary.
There optional features and functions that can be included with the DPS 300 which include alarm relay contacts, LCD display and square root extraction output signal. The square root extraction can also be configured for 3√ or 5√ output characteristic, so that it can be used to measure airflow using different pressure to flow conversion methods.
In addition to providing a local pressure reading the optional LCD display also includes menu buttons underneath the front cover to allow access to the sensor configuration settings. A number of parameters can be set via the menu buttons such as high/low values, contact switches, pressure units, zero & span calibration, square root extraction output, auto-zero and locking pin code.
Custom pressure ranges
From the data sheet I understand the DPS300 is a multi-range differential pressure transmitter. In that case, I presume we could use one model for all the measurements required for our measurements from 1.5mbar to 7mbar, or would you suggest using multiple sensors with 10mbar model for measurements from 6mbar to 7bar, 4mbar model for measurements from 2.5 to 4mbar and 1.6mbar model for measurements from 1mbar to 1.6mbar.
The multi-range capability is limited to 1 or 2 other fixed ranges (see pressure range table above). The ranges you have specified would have to supplied as single fixed custom pressure ranges since none of them correspond to a switchable range. The custom pressure range version cannot be altered by the user in the same way as the standard ranges.
Suction & discharge
Can the sensor could be used for both suction and discharge?
Yes, but you have to specify a bidirectional or compound pressure range such as -40 to + 40 mbar.
DMP 343 vs DPS 300
What is the difference between the two models DMP 343 and DPS 300?
The DMP 343 is a gauge reference pressure range (one port) device only, and minimum range is 10 mbar, whereas the DPS 300 is a gauge/differential pressure range (2 ports) device with minimum range of 1 mbar.