DPA / DPAS
Combine Accuracy and Ease of Use
The DPA/DPAS are pre-pressurized, gel-filled, low-maintenance pH or redox
sensors for in-line measurements of industrial processes. Pre-pressurized reference electrolyte prevents influx of process medium and keeps the reference junction
clean. The silver-ion trap prevents reference junction fouling even in solutions containing sulfide. The DPAS delivers fast and precise measurements, even after repeated autoclaving or sterilization cycles at 130 °C (266 °F).
The DPA/DPAS sensors are also available as a platinum redox (ORP) sensor for oxidation-reduction measurements.
pH range 0 – 14 pH 0 – 12 pH
Temperature 0 to 100 °C (32 to 212 °F) 0 to 130 °C (32 to 266 °F)
Pressure 0 to 2.5 barg (0 to 36 psig) 0 to 2.5 barg (0 to 36 psig) Plug head S8 screw cap, K8S screw cap,
Pg 13.5 Pg 13.5
(for AS9 connector) (for AK9 connector)
Reference system Argenthal with silver-ion trap Argenthal with silver-ion trap
Type of junction Ceramic Ceramic
Reference electrolyte Pre-pressurized gel Pre-pressurized gel
Lengths 120 mm, 225 mm, 425 mm 120 mm, 200 mm, 225 mm,
325 mm, 425 mm, 600 mm
Shaft diameter 12 mm 12 mm
Temperature sensor None None
Sterilizable No Yes
Autoclavable No Yes
Glass membrane High alkali quality glass pH sensitive quality glass
Certificates Quality certificate Quality certificate
Feature Overview
– Gel electrolyte does not require refilling, reduces maintenance
– Silver-ion trap prevents poisoning by sulfide-bearing substances
– Redox version available
– Option (DPAS only): watertight VarioPin connector (IP 68) for easy connection and excellent signal transmission
Typical Applications (DPA)
– Industrial processing
– Reaction tanks
– Mixing vessels
Typical Applications (DPAS)
– Benchtop fermentors and bio-reactors
– Hygienic processes requiring autoclaving or SIP