
PC Configurable Infrared 
Temperature Sensor 
For Demanding Applications
OS151-2USB-LT shown  
smaller than actual size.
OS150-2USB Series
†
Optional
U Short-Wavelength Measurement for 
Low Emissivity Targets Such as Steel 
Rollers and Other Metal Surfaces,  
Even at Low Temperatures
U Configurable Temperature Range, 
Emissivity Setting and More, Using  
a PC Via OMEGA® Software and  
USB Cable (Supplied)
U Features Max, Min, Average and 
Instantaneous Readings; Peak or Valley 
Hold; Reflected Energy Compensation
U OPC Server Capabilities 
U Temperature Ranges from 45 to 2000°C 
(113 to 3632ºF)
U Emissivity: 0.1 to 1.0 
U Stainless Steel Housing, 
Sealed to IP65
U Field of View: 15:1, 25:1, 75:1 or 
Close Focus
U Selectable 0 to 20 mA or 
4 to 20 mA Output
U Optional Air/Water Cooled Housing, 
Air Purge Collar, Laser Sighting Tool 
and Mounting Brackets
The OS150-2USB Series of infrared pyrometers 
measures temperatures from 45 to 2000°C  
(113 to 3632ºF) accurately and consistently, with an 
outstanding response time of 240 ms. The selectable 
0 to 20 mA or 4 to 20 mA output is compatible with 
almost any indicator, controller, recorder, data logger 
etc. without the need for special interfacing or signal 
conditioning. All OS150-2USB Series sensors are fully 
configurable from a PC using the OMEGA software  
and USB cable supplied. This user friendly software 
enables the user to set the temperature range 
and emissivity setting compensates for reflected 
energy; apply filtering; select max, min, average 
or instantaneous readings; and configure peak or 
valley hold processing. These features can also be 
monitored and adjusted by an OPC client. Other 
features include data acquisition, alarms and a 
scrolling graphical display. The sensor will operate 
with the 4 to 20 mA cable connected, the USB cable 
connected, or both. The USB cable has an IP65 
connector at the sensor end. An IP65 cap protects the 
sensor when the USB cable is not connected.
†
 For NIST calibration ordering information see accessories chart.
Compact stainless  
steel IP65 housing.
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Specifications
+-
-
+
Red
Red
Blue
Green
Power Supply
Power Supply
-
+
PC
+-
Display/
Controller
Display/
Controller
Yellow
Green
Blue
Yellow
15
60
135
0.6
2.4
5.3
0 59.1
118.1
0 15003000
Distance: Sensor to object (inches)
Distance: Sensor to object (mm)
Spot
Dia 
(in)
Spot
Dia
(mm)
15
60
135
0.6
2.4
5.3
0 59.1
118.1
0 15003000
Distance: Sensor to object (inches)
Distance: Sensor to object (inches)
Distance: Sensor to object (inches)
Distance: Sensor to object (mm)
Distance: Sensor to object (mm)
Distance: Sensor to object (mm)
15
100
215
0.6
3.9
8.5
0 59.1
15
7.5 
30
0.6
0.3
1.2
0 19.7
39.4
0 500 1000
Spot
Dia 
(in)
Spot
Dia
(mm)
Spot
Dia 
(in)
Spot
Dia
(mm)
Spot
Dia 
(in)
Spot
Dia
(mm)
OS151 OS251
15
60
135
0.6
2.4
5.3
0 59.1
118.1
0 15003000
Distance: Sensor to object (inches)
Distance: Sensor to object (mm)
Spot
Dia 
(in)
Spot
Dia
(mm)
Temperature Range: 
 LT (OS151 Only): 45 to 300°C 
(113 to 572ºF) 
MT: 250 to 1000°C (482 to 1832ºF)  
HT: 450 to 2000°C (842 to 3632ºF)
Field-of-View: 
 OS151 Only: 15:1 
 OS251: 25:1 
 OS751: 75:1 (OS751) 
 OS801: 7.5 Dia. at 500 mm
Output: Selectable 4 to 20 mA or  
0 to 20 mA (linear with temperature)
Configuration: Via PC port conforming 
to USB 2.0
Accuracy*: ±1% of reading or ±2°C, 
whichever is greater
Repeatability*: ±0.5% of reading or 
±0.5°C, whichever is greater
 Emissivity = 1.0, object temperature > 
*
sensor temperature + 20°C
Emissivity Setting: 0.1 to 1.0 
Response Time, t90: 240 ms 
(90% response)
Spectral Range: 2.0 to 2.4 μm 
Supply Voltage: 24 Vdc (26 Vdc max) 
Sensor Voltage: 11 Vdc min 
Max Loop Impedance: 900 Ω at 
24 Vdc
Maximum Span: Full temperature 
range up to 1550°C (2822ºF)
Minimum Span: 100°C (212ºF)
Mechanical
Construction: Stainless Steel 
Dimensions: 25 D x 106.5 mm L 
(0.98 x 419")
Thread Mounting: M20 x 1 mm pitch 
Weight with Output Cable: 
175 g (6.17 oz)
Output Cable Length: 1 m (3.3') 
USB Cable Length: 1 m (3.3')
Environmental
Environmental Rating: IP65 
Ambient Temperature: 0 to 70°C 
(32 to 158ºF) 
Relative Humidity: 95% max 
non-condensing
Sensor Connection
Power Supply
Red
+-
Blue
Green
Display/
Controller
+
Yellow
Power Supply
Red
+-
Blue
Green
Display/
Controller
+
Yellow
USB
PC
N/C
USB
PC
Note: The sensor must be grounded at only one point, either the cable shield or the sensor housing.
Diameter of target spot measured versus distance from sensing head.
Distance: Sensor to object (inches)
0 59.1
Spot
Dia 
(in)
0.6
15
Spot
Dia
(mm)
0 1500 3000
Distance: Sensor to object (mm)
Distance: Sensor to object (inches)
0
Spot
Dia 
(in)
0.6
15
Spot
Dia
(mm)
0 1500 3000
Distance: Sensor to object (mm)
3.9
100
OS151
59.1
0.8
D:S 75:1
20
OS751
D:S 15:1
118.1
8.5
215
118.1
2.2
55
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Distance: Sensor to object (inches)
0 59.1
Spot
Dia 
(in)
0.6
Spot
15
Dia
(mm)
0 150
Distance: Sensor to object (mm)
OS251
Distance: Sensor to object (inches)
0 19.7
Spot
Dia 
(in)
0.6
Spot
15
Dia
(mm)
0 500 1000
Distance: Sensor to object (mm)
0.3
7.5
OS801
2.4
60
118.1
5.3
D:S 25:1
135
000
39.4
1.2
30
 

OSUSB-FBL
Fixed Mounting Bracket
The L-shaped fixed mounting bracket offers a rigid 
support for the sensor and allows fine adjustment in  
a single plane.
OSUSB-APL
Air Purge Collar
The air purge collar is used to keep dust, fumes, 
moisture and other contaminants away from the lens.  
Air flows into the fitting on the side and out of the 
aperture at the front.
All models shown 
smaller than actual size.
Laser Sighting Tool
The laser sighting tool screws onto the front of the sensor during installation  
and indicates precisely where the sensor is aiming. Once the sensor has been 
aimed at the centre of the target and locked in position the laser sighting tool 
can be removed. The laser is activated by means of a push button on the front 
of the tool which has a latching mechanism.
OSUSB-ABL
Adjustable Mounting Bracket
The adjustable mounting bracket consists of a fixed 
mounting bracket plus another L-shaped bracket. 
When assembled as shown the adjustable mounting 
bracket offers a rigid support for the sensor and allows 
fine adjustment in two planes.
OSUSB-LSTL
 To Order Visit omega.com/os150-2usb for Pricing and Details
 Model No.  Temperature Range                Optics 
 OS151-2USB-LT  45 to 300ºC (113 to 572ºF)                 15:1 
 OS251-2USB-MT  250 to 1000ºC (482 to 1832ºF)                 25:1 
 OS251-2USB-HT  450 to 2000ºC (842 to 3632ºF)                 25:1 
 OS751-2USB-MT  250 to 1000ºC (482 to 1832ºF)                 75:1 
 OS751-2USB-HT  450 to 2000ºC (842 to 3632ºF)                 75:1 
 OS801-2USB-MT  250 to 1000ºC (4823 to 1832ºF)  Close-focus (7.5 mm Dia. measurement spot 
     at 500 mm distance) optics 
 OS801-2USB-HT  450 to 2000ºC (842 to 3632ºF)  Close-focus (7.5 mm Dia. measurement spot 
     at 500 mm distance) optics
Comes complete with sensor head, 1 m (3.3') cable, USB cable, software, and operator’s manual.
Ordering Examples: OS151-2USB-LT, PC configurable IR sensor with 15:1 optics. 
OS251-2US-MT-WC, PC configurable IR sensor with 25:1 optics with water cooled jacket.
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Options (Not Field Installable)
 Suffix   Description
 -WC    Air/water cooled jacket (includes air purge collar) 
 -2.2CE(*)     Cable extended, for uncooled IR USB series, 30 m (98') max total cable length
 1 m (3.3') cable is included as standard on every sensor. Extended cable is added to that length, add suffix to model number. 
*
Insert cable length in meters.
SM
Accessories
 Model No.  Description 
 OSUSB-FBL  Fixed bracket for IR USB
 OSUSB-ABL  Adjustable bracket for IR USB 
 OSUSB-APL  Air purge collar for IR USB 
 OSUSB-LSTL  Laser sighting tool for IR USB 
 CAL-3-IR†  NIST-traceable calibration
OMEGACARESM extended warranty program 
is available for models shown on this page. 
Ask your sales representative for full details 
when placing an order. OMEGACARE 
covers parts, labor and equivalent loaners.
Extended Warranty
Program
SM 
Power Supplies 
 Model No.   Description 
 PSR-24S   Regulated power supply, US plug, 90 to 264 Vac input, 24 Vdc output, 400 mA,    
   screw terminals, UL 
 PSR-24L   Regulated power supply, US plug, 90 to 264 Vac input, 24 Vdc output, 400 mA,    
   stripped leads, UL 
 PSR-24L-230   Regulated power supply, European plug, 230 Vac input, 24 Vdc output, 400 mA,    
   stripped leads, CE
 TX8-100   Power/output cable, 30 m (98')
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