Home of the "DGA"

Providing products and services for the Dissolved Gas Analyzer

The Bay Instruments DGA is a customized membrane inlet mass spectrometer designed for high precision and rapid analysis of dissolved air gases in natural water samples.  

Contact:            Todd Kana                                   410 924-3507

                          Bay Instruments                          410 770-9570 fax

                          6180 Waterloo Dr.

                          Easton, MD  21601 USA             kana@bayinstruments.com

 

                          Link to Todd’s faculty website

Origin and Mission

 

Bay Instruments was established to assist researchers in acquiring the MIMS capability developed by Todd Kana and colleagues at Horn Point Laboratory of the University of Maryland.  Our focus is on rapid, very high precision measurement of the dissolved air gases nitrogen, oxygen and argon for applications in aquatic denitrification and system metabolism research.  Bay Instruments sells complete systems and specialized inlets along with providing application expertise and assistance.

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Capabilities of the DGA

 

· Detects air gases in water including stable isotopically labeled gases.

· Direct measurement of dissolved N2, O2, and Ar concentrations in environmental water samples.  Does not require headspace equilibration.

· Analysis time of <2 minutes per raw water sample, typical.

· Precision of dissolved N2, O2, and Ar measurements (triplicate samples): 0.2%.

· Precision of gas ratio (N2/Ar and O2/Ar) measurements (triplicate samples): 0.03%.

· Automatic recording of dissolved gas data in ‘strip chart’ mode. 

· Isotope ratio (15N/14N and 18O/16O) measurement on dissolved N2 and O2.

· Can be applied to CO2, CH4, DMS, and other low molecular weight dissolved gases.

Item

Description

Compete DGA

Turn-key systems using either Pfeiffer Vacuum Prisma or 422 mass spectrometers.  E-mail for information.

Furnace option

Tube furnace with vacuum line, valves, and supports for using a copper reduction column inline with the inlet.

Membrane inlet

Glass inlet with silicone membrane, capillaries and peristaltic pump tubing (assembled).  Attachment end is a 3/8” glass tube.

Pump tubing

Peristaltic pump tubing.  Viton, 2-stop, 10 cm tails. 10 per pack

Standard apparatus

Standardization apparatus: stirrer, flask, stoppers, support.  (Requires modification of circulating bath.)

Software

DGA data display and logging software for Pfeiffer Prisma and QMS422 mass spectrometers.  Win XP and Win 98 compatible.  Features 16 channel display, channel averages and ratios, time stamp for all data, convenient copy/paste recording of data into a spreadsheet.  Optional automatic logging to file of individual mass signals with time stamp.  Optional automatic recording to file of enabled channels at a defined interval (1-60 seconds) with time stamp.  Requires Quadstar for instrument parameterization.

For quotes, information and orders, e-mail kana@bayinstruments.com.  We accept credit cards using Google Checkout