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Differential air pressure transmitter
Type Item no. ADG Euro / pc.

Differential pressure transmitter DDS-QR984xx
with automatic zero point adjustment
8 measuring ranges (Code QR) – adjustable
Complete unit (without fastening angles)
for vertical installation, consisting of:
Differential pressure monitor and clima-set straight type 6555.

Output signal: switchable root extracting / linear
Output: 0 – 10 V or 4 – 20 mA adjustable
(3-wire) with additional npn open
collector switching output
Dimensions: ø 85 x 58 mm (L x W),
protection class: IP 54
Voltage supply: 18 – 30 V AC, 16 – 32 V DC (3-wire)
Uncertainty (total error disregarding long-time and
temperature influences): ±1% of full scale, min. ±1 Pa
Permiss. amb. cond.: -10 – 50 °C, 0 – 95 % RH
(non-condensing)
Data sheet no. 13252
without display DDS-QR984.5.5.3.K.0 103597 12 241.40
with display DDS-QR984.5.5.3.K.1 103598 12 284.40

Type Switch DDS-QR984.5.5.3.K.1
position Pressure measuring Temperature
range error
DDS-QR984.5.5.3.K.1 1 ±100 Pa ≤ ± 4 % v. EW
2 0 – 100 Pa ≤ ± 5 % v. EW
Overpressure safety: 3 0 – 200 Pa ≤ ± 4 % v. EW
85 kPa 4 0 – 500 Pa ≤ ± 2,5 % v. EW
5 0 – 1,000 Pa ≤ ± 1,5 % v. EW
Cracking pressure: 6 0 – 1,500 Pa ≤ ± 1,5 % v. EW
135 kPa 7 0 – 2,000 Pa ≤ ± 1 % v. EW
8 0 – 2,500 Pa* ≤ ± 1 % v. EW
LO Test 0 V / 4 mA -
HI Test 10 V / 20 mA -
DDS-QR984.….K.0 without display, technical information as above
* = Factory setting
without display DDS-QR984.5.4.3.K.0 103097 12 241.40
with display DDS-QR984.5.4.3.K.1 103098 12 284.40

Type Switch DDS-QR984.5.4.3.K.1
position Pressure measuring Temperature
range error
DDS-QR984.5.4.3.K.1 1 0 – 100 Pa ≤ ± 4 % v. EW
2 0 – 250 Pa ≤ ± 3,5 % v. EW
Overpressure safety: 3 0 – 500 Pa ≤ ± 2 % v. EW
75 kPa 4 0 – 1,000 Pa* ≤ ± 1 % v. EW
5 ± 50 Pa ≤ ± 4 % v. EW
Cracking pressure: 6 ± 100 Pa ≤ ± 3 % v. EW
125 kPa 7 ± 250 Pa ≤ ± 2 % v. EW
8 ± 500 Pa ≤ ± 1 % v. EW
LO Test 0 V / 4 mA -
HI Test 10 V / 20 mA -
DDS-QR984.….K.0 without display, technical information as above
* = Factory setting

62 | Catalog 2025 | Sensors To our online catalog: www.oprg.de/en/support/download-center