Introduction

The Dissolved Gas Extraction Unit (DGEU) allows continuous concentration measurements of dissolved gases in water and other liquids in real time. The DGEU extracts gas from a liquid stream through an internal hydrophobic micro-porous membrane (comprised of polypropylene hollow fibers). Internal water and gas pumps and mass flow controllers allow precise control of flow rates and pressures of the liquid in the DGEU and the strip gas which is sent to the gas analyzer. By accurately controlling the water flow rate through the membrane, gas pressure on the outside of the membrane, and water pressure on the inside of the membrane, the DGEU is able to generate precise and reproducible results.

Features and Benefits

• Simultaneous gas-phase concentration and dissolved gas molar measurements of a variety of gases*

• Low power requirements (45 W)

• Easy to service in the field

• Lightweight (16 kg)

• Internal datalogger

Performance Specifications

Sampling Conditions:

Sample liquid temperature: 0 – 40 °C

Sample liquid flow rate: 1 – 2 L/min (user adjustable)

Sweep gas flow rate: 0.15 – 1.0 sL/min

All gas and liquid parameters recorded on internal data logger

Datalogger signal inputs/outputs:

Analog inputs: 16x single-ended (8 differential) channels

- 4 single-ended channels reserved for Gas Analyzer outputs

- 7 single-ended channels dedicated for DGEU parameters

- 4 single-ended channels available for user external inputs

Analog outputs: 3 available for user

Digital I/O: 6 available for user

Interface protocols supported (through serial connections):

PakBus, Modbus, TCP/IP, DNP3, FTP, HTTP, SMTP

Connections:

Sweep gas inlet/outlet to gas analyzer: 1/4”(OD) Swagelok®

Water inlet/outlet: 3/8” (OD) Swagelok®

Power Requirements:

10-30 VDC, 45 watts

Dimensions:

18.75”x 18.88”x 10.69”

Weight:

16 kg