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OS212
Fixed Infrared Temperature Sensor w/ adjustable emissivity and optional display
- Temperature Range -20 to 500°C (-4 to 932ºF)
- 2-Wire 4 to 20 mA Output Proportional to Target Temperature
- 4 to 20 mA Input to Control Emissivity Setting
- Optional Manual Emissivity Adjuster (Model No. OS210-PT)
Product Overview
- Accuracy ± 1 %
- Accuracy Detail ± 1% of reading or ± 1ºC whichever is greater
- Cable Length 3.3 ft
- Cable Length Note 1 m (3.3') (included) longer lengths available to order
- Display No
- Emissivity, Max 1
- Emissivity, Min 0.2
- Emissivity Note 0.2 to 1.0 via 4 to 20 mA input
- Enclosure Ratings IP65
- Field of view 2:1
- Housing Material Stainless Steel
- Impedance 900 Ω
- Operating Temperature, Max 70 °C
- Operating Temperature, Min 0 °C
- Output Signal Current
- Process Temperature, Min 0 °C
- Relative Humidity, Max 0.95
- Relative Humidity Note 95% max non-condensing
- Repeatability ± 0.5%
- Repeatability Note ± 0.5% of reading or ± 0.5ºC whichever is greater
- Response Time 240 ms
- Response Time Note 240 mS (90% response)
- Sensing head Mounting 16 mm
- Sensor Voltage 6 Vdc
- Series ID OS212
- Spectral Response, Max 14 μm
- Spectral Response, Min 8 μm
- Supply Voltage 24 to 28 Vdc
- Temperature Range MT-Medium
- Weight 95 g
- Weight Note 95 g (3.4 oz) with cable
Supported Applications
The Omega OS212 Series consists of compact non-contact infrared temperature sensors designed to measure the surface temperatures of inaccessible or moving objects and materials. The series provides a linear output signal compatible with indicators, controllers, recorders, and data loggers without requiring special interfacing or signal conditioning.
Operating Conditions & Performance
The OS212 Series measures process temperatures across three ranges: -20 to 100°C (-4 to 212°F), 0 to 250°C (32 to 482°F), and 0 to 500°C (32 to 932°F). Accuracy is specified as ±1% of reading or ±1°C whichever is greater, with repeatability of ±0.5% of reading or ±0.5°C whichever is greater. The sensors operate within an ambient temperature range of 0 to 70°C (32 to 158°F) and a relative humidity limit of 95% max non-condensing.
Performance characteristics include a response time of 240 mS (90% response) and a spectral range of 8 to 14 μm. The sensors are constructed from stainless steel with an IP65 environmental rating. Electrical requirements specify a supply voltage of 24 Vdc (28 Vdc max), a minimum sensor voltage of 6 Vdc, and a maximum loop impedance of 900 Ω for the 4 to 20 mA output.
Configuration Options
The series is available in four optical configurations identified by model prefixes: OS212 (2:1 optics), OS152 (15:1 optics), OS302 (30:1 optics), and OS802 (close-focus, ø5mm @ 100mm). Each optic supports the three temperature ranges denoted by suffixes -LT, -MT, or -HT. The standard sensor dimensions are 103 L x 18 mm D (4.05 x 0.71") with an M16 x 1 mm pitch thread mounting and a 1 m cable.
Configurable Emissivity
Emissivity is adjustable from 0.2 to 1.0 via a 4 to 20 mA input, allowing automatic adjustment from a programmable logic controller (PLC). If the 4-20 mA input is left open or short-circuited, the emissivity setting defaults to 0.95. Manual adjustment is available using the optional OS210-PT Tune Emissivity Adjuster.
Options and Accessories
- Cable extensions: Suffixes -CE (uncooled) or -CEHT (high temperature, cooled) allow total cable lengths up to 30 m (98').
- Housing options: Air/water cooled jacket (-WC suffix), which includes an air purge collar and must be ordered with the sensor.
- Mounting hardware: Fixed bracket (OS210-FBS) or adjustable bracket (OS210-ABS).
- Air purge collars: OS210-APSW for 2:1 sensors; OS210-APSN for 15:1, 30:1, and close-focus sensors.
- Sighting tools: Laser sighting tool (OS210-LSTS).
- Calibration: NIST-traceable calibration (CAL-3-IR†) is available as an option.
Key Product Differences
The primary distinction within the series lies in the optical field of view and temperature range. The OS212 model provides 2:1 optics, while OS152 offers 15:1, OS302 offers 30:1, and OS802 provides close-focus capabilities (ø5mm @ 100mm). Temperature ranges are segmented by suffix: -LT covers -20 to 100°C (-4 to 212°F), -MT covers 0 to 250°C (32 to 482°F), and -HT covers 0 to 500°C (32 to 932°F). The OS210-PT accessory is a separate unit with a polycarbonate housing, surface mounting, and dimensions of 65 H x 50 W x 35 mm D (2.56 x 1.97 x 1.38"). It features a 3.5 digit LCD display showing emissivity or current values.
