Model 221R
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.
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% | 0°F to 130°F (17.8°C to 54.4°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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Features & Benefits
Designed for OSHA Compliance
The MODEL 221R is optimized for safety. Our standard offering provides (3) OSHA-compliant preset alarm relay contacts and a single 95 decibel audible alarm. The “Caution” alarm is preset for 20.0% oxygen, Danger for 19.5% and the Enriched Oxygen alarm for 23.5%. Both the 19.5% Danger and 23.5% Enriched Oxygen condition trigger alarm relay contacts and the 95dB audible alarm to alert personnel of the potentially dangerous situation. This Analyzer is also NRTL-certified to be compliant with UL61010-1, covering safety requirements of equipment for measurement, control and laboratory use.
10-Year Zirconium Oxide Sensor Technology
AMI’s zirconium oxide sensors are virtually maintenance-free, extremely accurate and stable over a wide temperature range without suffering from changes in barometric pressure. This unique sensor is the perfect choice for reliably measuring percent levels of oxygen in confined spaces, tank storage area, or in the workspace, ensuring personal safety. AMI’s zirconium sensor in the MODEL 221R will last up to 10 years without ever needing replacement.
Zirconium Oxide SensorsOptional Remote Probe
The MODEL 221R is available with an optional remote probe for continuous monitoring of locations separate from the control unit. This makes it an ideal solution for making sure difficult to access locations continue to have a safe oxygen level. The remote probe comes standard with a 12 ft (3.6m) cable, but they can be extended by the customer up to 300 ft (91.4m). The probe features the same long-life zirconium oxide sensor as the standard MODEL 221R.
FULL SUITE OF STANDARD FEATURES
The MODEL 221R comes standard with a 4-20mA isolated output signal and bi-directional RS485 communication. It has built-in safety features including rechargeable battery backup and tamper resistant alarms to prevent user override of safety setpoints. It also offers advanced features that can be accessed through AMI’s COMMAND CENTER Software. These includes automatic data logging that provides detailed time-stamped records of O2 measurement, and power supply voltage, as well as calibration history.
Available Accessories
Model 221R Downloads
- Data Sheetmodel-221r-data-sheet.pdf (3.2 MB)
- Data Sheet w/ Remote Probemodel-221r-w-remote-data-sheet.pdf (2.2 MB)
- Operator Manualmodel-221r-operator-manual.pdf (711 KB)
- More Downloads
Industry Applications
