The Model 901 is a battery-operated, portable oxygen analyzer used for the measurement of residual oxygen in gas-flushed (CAP/MAP) food packages. This hand-held unit can be used by non-technical personnel where you need it, in the lab or at the packaging line, or it can be easily transported to other locations. The Model 901 is powered by Ni-Cad rechargeable batteries, with typically 8 hours of operation before recharging is required.
Model 901 O2 Analyzer 660 901
The Model 901 design has proven itself in hundreds of installations for food applications such as meats, fresh produce, pasta, nuts, snack foods, dairy products and coffee. The sensor is unaffected by high levels of background gases such as nitrogen or carbon dioxide. The Model 901 can also be used for applications where the oxygen level is very high (50 to 100%), without overloading the sensor. It is unaffected by trace hydrocarbons or high levels of CO2, which can poison other types of sensors.
EASY SAMPLING & ANALYSIS
The Model 901 sample probe is tipped with a particulate filter and luer fit syringe needle with side-port holes to prevent plugging. Sample is drawn through the probe and tubing and then to the oxygen sensor when the pump is turned on. The pump is electronically timed to draw in the precise amount of sample required for the analysis, and then turns itself off after the pre-set sampling time (5 to 10 seconds). The oxygen concentration is read on the display.
•Range: 0.0 to 100% Oxygen
•Resolution: 0.1% Oxygen
•Accuracy: +/- 1% of reading
•Minimum Detection Limit: 0.1%
•Drift: less than 1% per month
•Sensor: Proprietary electrochemical cell, expected lifetime 4-5 years
•Sample Pump: Internal, draws ~5cc/sec, with 2-12 second adjustable timer (on side of unit)
•Sampling Assembly: Probe with male luer connection for side-port needle, PTFE tubing
•Calibration: Calibrates with room air; SPAN adjustment on side; ZERO adjustment on side
•Calibration Frequency: Minimum once per year
•Power Supply: Four "AA" NiMH rechargeable batteries; auto shut-off after 45 minutes idle. 100-240V (50-60Hz) Charger included, with US or international interchangeable plug adapter (upon request)
•Backup Power: Four "AA" alkaline batteries (not included)
Sampling from a bottle with limited headspace is possible without using the internal pump on our analyzers. For example, measuring the oxygen from a rigid bottle with 50 cc (or 50 ml) of headspace can create a vacuum condition if you draw 15cc of headspace from that bottle, but this challenge is easily overcome.
If the sample is withdrawn manually from the bottle, it can be injected directly into the analyzer for analysis. This method can be used with our Model(s) 901, 905, 902D, or 907 analyzers. In general, 10 cc of sample is recommended for best results.
The pump on the 901 draws about 5cc/sec. The minimum amount to produce an accurate result is 10cc. So, if the package is rigid, and contains 50 cc of headspace, the user could use the pump for 2 seconds – but they would be creating a vacuum of 0.8 atm. As a result, their results will be about 20% lower – so 2% oxygen could read 1.6%. This is usually not of much consequence unless the application has a really tight standard.
The real difficulty is with a rigid container with 20cc of headspace. If they remove 10cc from that container, that will create a 0.5 atm, or 50% vacuum, and their results will be half. So 2% oxygen will read 1%.
Not to mention using the instrument this way will eventually degrade the sensor and pump.
See procedure details under Technical Specifications.
Sampling from a bottle, can, or other container with 10-50 cc of headspace