Description
OMEGA OS550
Technical Specifications
Manufacturer: OMEGA Engineering
Product family: OS550 / OS550A series industrial infrared thermometer
Measurement type: non-contact infrared temperature
Temperature ranges:
OS551: -18 to 400 °C / 0 to 750 °F
OS552: -18 to 538 °C / 0 to 1000 °F
OS553: -18 to 871 °C / 0 to 1600 °F
OS554: -18 to 1371 °C / 0 to 2500 °F
Accuracy: ±1 percent of reading or 1.7 °C / 3 °F, whichever is greater, at 25 °C ambient and 0.95 emissivity
Repeatability: ±1 percent of reading plus 1 digit
Spectral response: 8 to 14 microns
Emissivity: 0.10 to 1.00, adjustable in 0.01 steps
Response time: 100 ms to 63.2 percent of final value
Display: backlit dual LCD showing current, minimum, maximum, average, or differential temperature
Analog output: 1 mV per degree, 0 to 5 Vdc, or 4 to 20 mA
Alarm output: high and low alarms with red LED and audible indicator; voltage output capable of 100 mA drive
Power supply: 8 to 24 Vdc at 80 mA
RS232 interface: available on OS552A, OS553A, and OS554A models
Environmental rating: NEMA 4 / IP65 for sensing head and electronics enclosure
Operating temperature: 0 to 50 °C for standard sensing head and electronics; up to 85 °C with OS550-WC water-cooled jacket
Sensing head dimensions: 109 mm length x 41 mm outer diameter
Electronics housing: plastic or aluminum enclosure
Cable length: 4.5 m sensor head and power/output cable included
Laser pointer: 650 nm red laser, Class II, less than 1 mW output
Functional Features
Non-contact infrared temperature measurement
Adjustable emissivity for different surface materials
Backlit dual LCD display
Minimum, maximum, average, and differential temperature display
Analog output for process control integration
High and low alarm outputs
Audible and visual alarm indication
RS232 communication on selected models
Data storage and recall on selected models
PC software support for data logging on selected models
Fast 100 ms response time
No moving parts such as chopper motors
Suitable for continuous industrial monitoring
NEMA 4 / IP65 protected sensing head and electronics
Laser aiming assistance
Compatible with recorders, controllers, and data acquisition systems
Application Scenarios
Process temperature monitoring
Predictive maintenance for rotating equipment
Motor and bearing temperature surveillance
Electrical panel hot-spot detection
Furnace and heater zone monitoring
Plastic and rubber process temperature control
Food processing surface temperature monitoring
HVAC system temperature verification
Energy audit and insulation inspection
Industrial oven and dryer monitoring
Performance Parameters
Temperature accuracy: ±1 percent of reading or 1.7 °C / 3 °F, whichever is greater
Repeatability: ±1 percent of reading plus 1 digit
Response time: 100 ms
Spectral range: 8 to 14 microns
Emissivity adjustment: 0.10 to 1.00
Analog output: 1 mV/°C, 0 to 5 Vdc, or 4 to 20 mA
Alarm drive capability: 100 mA
Power consumption: 80 mA at 8 to 24 Vdc
Protection: NEMA 4 / IP65
Material Composition
Infrared optical sensing head
Thermopile or infrared detector assembly
Signal conditioning electronics
Microprocessor-based measurement circuit
Backlit LCD display
Plastic or aluminum electronics enclosure
Sealed keypad and display window
LED alarm indicators
Laser aiming diode
Power and output cable assembly
Grounding and shielding components
Structural Features
Separate sensing head and electronics housing
Compact cylindrical sensor head
Backlit dual-line LCD
Front keypad for configuration
LED alarm indicators
Laser aiming window
Cable connection to electronics enclosure
NEMA 4 / IP65 sealed construction
DIN rail or panel-mountable electronics housing
Threaded sensing head for flexible mounting
Working Principle
All objects emit infrared energy proportional to their surface temperature. The OS550 sensing head collects this infrared radiation through its optical system and converts it into an electrical signal. The electronics module processes the signal, applies emissivity correction, and calculates the target temperature. The measured value is displayed on the LCD and transmitted through analog outputs, alarm outputs, and RS232 communication where available. Because the device does not use mechanical choppers or vibrating components, it can be mounted in any orientation without performance loss.
Installation Requirements
Mount the sensing head so it has a clear view of the target surface
Avoid steam, dust, smoke, or obstructions in the optical path
Maintain the correct distance-to-spot ratio for the selected model
Use the correct emissivity setting for the target material
Install the electronics enclosure within 0 to 50 °C ambient temperature
Provide 8 to 24 Vdc power according to the wiring diagram
Use shielded cables for analog and communication signals
Ground the system according to OMEGA recommendations
Configure alarm setpoints and output scaling before operation
Usage Precautions
Do not look directly into the laser beam
Verify emissivity settings for accurate measurement
Keep the lens clean and free of oil, dust, or condensation
Do not exceed the specified ambient temperature limits
Use the water-cooled jacket option for high-temperature environments
Avoid measuring through glass or transparent plastics
Confirm analog output scaling matches the receiving instrument
Replace only with genuine OMEGA OS550 or approved OSAO-series replacements
Refer to the official OMEGA manual for final wiring and accuracy data
