Oxygen Deficiency Monitor
Model 221R
Price: $1,765.00
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up to 10 units
Pricing shown is for North America only. For other regions, contact your local distributor or AMI for pricing.
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DESIGNED FOR SAFETY
The AMI MODEL 221R is the gold standard for oxygen deficiency & confined space oxygen monitoring. It is used by the thousands in US Government Laboratories, Space Agencies, Universities and a broad range of industries to ensure the safety of personnel. The MODEL 221R provides an incredibly accurate and stable reading over a wide temperature range (0-130°F) and is not affected by changes in barometric pressure. This analyzer is virtually maintenance-free with its unique oxygen sensor delivering a 10-year life expectancy.
Note that the MODEL 221R should not be used in areas where Flammable Gases may be present.
Features & Benefits
Technical Specifications
WEIGHT | MOUNTING | GAS CONNECTIONS | Digital Display |
4.0 lbs (1.8 kg) | Wall mount | Diffusion screen. No pump, sample tubing or fittings required | 4-digit LCD (reads full scale from 0.0% to 25.0%) |
POWER | OUTPUTS |
100 –240 VAC <115 Watts. Battery back-up provides 1 hour of power | 4 – 20 mA isolated output signal Bi-directional RS485 communication |

Measurement Range | AMBIENT OPERATIONAL TEMPERATURE range | Method of Measurement |
0 –25.0% | +14°F to +122°F (-10°C to +50°C) | Zirconium Oxide Sensor (10-year life expectancy) |
Minimum detection limit | 90% UPSCALE RESPONSE TIMES FOR SPECIFIC RANGES | REPEATABILITY | Diurnal Temperature Specification | APPROVALS |
0.05% of Oxygen | <12 sec for 0.0% – 25.0% | ±0.1% of range or ±0.1% of oxygen whichever is greater | <±1% of scale over temperature range | UL 61010-1 for Safety Electrical Equipment CE Marked, Designed to Meet IP65 |
TAMPER RESISTANT PRESET ALARMS | OSHA Preset Standard Alarms
Additional Preset Alarm
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WASH DOWN READY | Designed to withstand direct water spray |
SAFETY FEATURES |
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ACCESSORIES |
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COMMAND CENTER SOFTWARE | Included Software, which provides access to advanced functions:
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Available Accessories
Model 221R Downloads
- Data Sheetmodel-221r-data-sheet.pdf (3.2 MB)
- Operator Manualmodel-221r-operator-manual.pdf (711 KB)
- More Downloads
Industry Applications