Oppermann Regelgeräte DDS-M984 Series Manual

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