Sensors PG1 | Data sheet No. 13251 | Version 09-2019 | 1 | 6
Pressure dierential
transmitter DDS-M984…
DDS-MR984…
Technical Data
Compressed medium: Air and non-aggressive media
Power supply:
• 3-wire-design 18 – 30 V AC / DC
• 2-wire-design 18 – 30 V DC
Output signal:
• 3-wire-design 0 – 10 V and 4 – 20 mA
• 2-wire-design 4 – 20 mA
Maximum current draw:
• Without display 160 mA
• With LED display 210 mA
Admissible ambient
conditions: -20 – 70 °C, 0 – 95 % RH
(non-condensing)
Long-term stability, type: ≤ ± 1 % of sensor reading/year
Load (at 4 – 20 mA): 20 – 500 Ω
Linearity (incl. hysteresis
and reproducibility): ≤ ± 0.5% of full scale, min. ± 1 Pa
Uncertainty (total error
excluding long-term and
temperature inuence): ± 1% of full scale, min. ± 1 Pa
Switching output (npn): max. 30 V DC/100 mA
1)
Output signal toggle: Linear/square root extraction
Zero setting adjustment: Manual
Response time settings: Short, 200 ms
long, 1 s (default setting)
Process ports: 6 mm hose anges
Electrical connection: Screw terminals for wires
and cores up to 1.5 mm²
Mounting: Screw mounted with sheetmetal
screws
Display, optional: Red LED display, 3.5-digit
1)
Housing material: Switch housing with process port P2,
ABS, light-gray;
mounting bracket with process port
P1, POM, white
Housing dimensions: Approx. Ø 85 mm, H 58 mm
Weight: Approx. 135 g
Protection type
iaw. EN60529: IP 54 with protective cover
Cable grommet for
protective cover: M 16 x 1,5 Polyamide threads
Standards / conformity: EN 60770, EN 61326
2011/65/EU (RoHS)
Sensor method: Piezo-resistive pressure sensor for
airows
1)
only on 3-wire design
• Metric cable glands
• Arbitrary installation orientation
Function
Pressure dierential transmitters of type series DDS 984 are
used to measure dierential, positive, and negative pressure in
gaseous, non-aggressive media. They have 2 sensor pressure
ranges and 2 output signals that can be selected alternatively
by swapping a jumper.
The pressure transducer converts the mechanical pressure
reading into an electrical sensor signal. The piezo-resistive
pressure transducer integrated into the DDS 984 pressure
dierential transmitter is congured so that the pressure to be
read is applied to a thin mono-silicon membrane. This deects
the membrane. The membrane is equipped with resistors based
on semi-conductor technology. These detect the mechanical
deection and generate an electrical output signal. The arran-
gement of the resistors at the same time results in temperature
response compensation. High-gain process ampliers convert
the signal from the pressure transducer into the output signal.
Within the specied error limits, the electrical output signal
changes proportionally to the applied pressure.
Possible applications include:
• Building automation, air-conditioning and cleanroom
technology
• Valve and damper control
• Filter, ventilator, and blower monitors
• Airow controls
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