| Items |
 Model 481N4 Model 481N4, Carbon Monoxide Analyzer (infrared), Wall Mounted NEMA4 (IP65) Enclosure Rating |
 Model 481N4N7 Model 481N4N7, Carbon Monoxide Analyzer (infrared), ex-proof sensor housing with NEMA4 wall-mount control cabinet (two separate enclosures) |
 Model 481N7MC Model 481N7MC, Carbon Monoxide Analyzer (infrared), Wall Mounted NEMA7 UL/CSA Explosion-proof with Non-intrusive Magnetic Calibration, Class 1 Div 1 Group BCD |
 Model 481RMN7 Model 481RMN7, Carbon Monoxide Analyzer (infrared), ex-proof sensor housing with rack mount control cabinet (two separate enclosures) |
 Model 481 D1 or D2 Model 481 D1 or D2, Carbon Monoxide Analyzer (infrared) - 481 Series; NEMA 4 cabinet with Hazardous Area Purge System |
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| Method of Detection | Single cell NDIR with no moving parts | Single cell NDIR with no moving parts | NDIR infrared detector for CO | NDIR infrared detector for CO | Single cell NDIR with no moving parts | |||||
| Ranges Available | High ranges - any from 0-40 to 0-100% CO Standard ranges - 0-1.00, 2.00, 5.00, 10, 30% CO | |||||||||
| Accuracy & Repeatability | ±1-3% of full scale, depending on measurement range and application | |||||||||
| Drift | Usually 2% of full scale per month or less, depending on range and application | |||||||||
| Response Time (T-90) | Usually 20-30 seconds to 90% step change, depending on range and application | |||||||||
| Ambient Temperature Range | 40 to 104°F (4 to 40°C) | |||||||||
| Linearity | Usually ±1.5% of full scale, depending on range and application | |||||||||
| Size & Weight | NEMA 4: 51H x 41W x 26D cm (20"H x 16"W x 10"D) RACK MOUNT: 22H x 48W x 47D cm (8.7"H x 19"W x 16"D) | EX-PROOF: 61H x 33W x 31H cm (24"H x 13"W x 12"D) NEMA 4: 51H x 41W x 26D cm (20"H x 16"W x 10"D) | EX-PROOF: 61H x 33W x 31H cm (24"H x 13"W x 12"D) | EX-PROOF: 61H x 33W x 31H cm (24"H x 13"W x 12"D) RACK MOUNT: 22H x 48W x 47D cm (8.7"H x 19"W x 16"D) | NEMA 4: 61H x 51W x 31D cm (24"H x 20"W x 12"D) (not including purge panel & vent) | |||||
| Output Options | 4-20 mA into 500 ohms non-isolated standard Isolated 4-20 mA, RS232, RS485, serial outputs | 4-20 mA into 500 ohms non-isolated standard Isolated 4-20 mA, RS232, RS485, serial outputs | 4-20 mA into 500 ohms non-isolated standard Isolated 4-20 mA, RS232, RS485 serial outputs | 4-20 mA into 500 ohms non-isolated standard Isolated 4-20 mA, RS232, RS485 serial outputs | 4-20 mA into 500 ohms non-isolated standard Isolated 4-20 mA, RS232, RS485 serial outputs | |||||
| Alarms | High and/or Low alarm contacts available, relay contacts SPDT 5A @ 220 VAC rating Low flow alarm | |||||||||
| Options | Cabinet coolers can be fitted to most models Hi/Low gas, Low Flow alarms available High temperature filters and probes Isolated 4-20 mA, RS232, RS485, serial outputs Light duty sample conditioning systems available for removal of moisture and/or dust | Hi/Low gas, Low Flow alarms available Isolated 4-20 mA, RS232, RS485, serial outputs | Hi/Low gas, Low Flow alarms available Isolated 4-20 mA, RS232, RS485 serial outputs | Hi/Low gas, Low Flow alarms available Isolated 4-20 mA, RS232, RS485 serial outputs | Cabinet coolers can be fitted to most models Cabinet purge system available for use in hazardous areas Hi/Low gas, Low Flow alarms available High temperature filters and probes Isolated 4-20 mA, RS232, RS485 serial outputs Light duty sample conditioning systems available for removal of moisture and/or dust | |||||
| Analyzer Type | CO analyzer (IR) | CO analyzer (IR) | CO analyzer | CO analyzer | CO analyzer | |||||
| Hazardous Area Rating Options | General Purpose, Non-Hazardous | Control Cabinet - General Purpose, Non-Hazardous Detector Cabinet - NEMA7 Class 1 Division 1 Groups BCD | Class 1, Div 1, Grp A-D Hazardous Area Rating | Control Cabinet - General Purpose, Non-Hazardous Detector Cabinet - NEMA7 Class 1 Division 1 Groups BCD | Class 1 Div 2 or Class 1 Div 1 Hazardous Area Ratings available | |||||
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