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T: 514-354-2511
T: 1 800 463-4363
F: 514-354-6948
Noncontact Temperature Measurement for Industrial Applications

Noncontact Temperature Measurement for Industrial Applications

Product Code:MI from Raytek

Need more Info? (514) 354-2511 - 1-800-463-4363

MI Highlights
  • Small sensing head fits where other sensors can’t
  • Three Ambient operating ranges MID 85ºC (185ºF) MIC 125ºC (257ºF) MIH 180ºC (356ºF)
  • 5-digit backlit LCD user interface
  • Adjustable Emissivity, Peak Hold, Valley Hold and Averaging functions
  • 1% accuracy from -40°C to 600°C (-40°F to 1112°F)
  • 10:1, 22:1 optics
  • Powered by 12-24 VDC at ≤100 mA
  • Accessories for cooling and air purging
  • Remote electronics box
  • RS-232 or optional RS-485 digital communications for remote setup and monitoring

The Raytek MI is a two-piece infrared temperature measurement system with miniature sensing head and separate electronics. The sensor is small enough to be installed just about anywhere, yet it performs as well as much larger systems. The MI electronics include a host of signal processing features which you won’t normally find in systems in this price range, including Emissivity, Peak Hold, Valley Hold, and Averaging function, all of which are adjustable on the 5-digit LCD user interface.

Designed for a wide range of applications where the target temperature is in the -40°C to 600°C (-40°F to 1,112°F) range, the sensor is housed in a rugged stainless steel enclosure to ensure long term performance, even in harsh industrial environments with ambient temperatures up to 180°C (356°F) without cooling. Although the MI unit is small in size, it still has the features you need, with 1% accuracy, 10:1 or 22:1 optics and user selectable output signals. And the MI system’s response time is as fast or faster than many advanced systems.

Even more features are available with the RS-232 or optional RS-485 communications and the DataTemp Multidrop Software. These features include remote control and monitoring of all sensor variables, a 5V alarm signal triggered by a target temperature or head ambient temperature, an 8-position “recipe” table that can be easily interfaced to an external control system, an external reset signal input for signal processing, and even external inputs for analog emissivity adjustment or reflected energy compensation.

The MI unit’s miniature size and low cost make it ideal for installation at multiple points along your process. Accurate. Rugged. Easy to install. Affordable. With the MI, precision infrared temperature measurement is now an economical alternative.
Raytek MI – miniature sensor, maximum performance!

Measurement Specifications
Spectral Response: Model LT (Low Temp.) 8 to 14 microns
Optical Resolution: LT 10:1, 22:1
Temperature Range: Model LT -40°C to 600°C (-40°F to 1112°F);
-25°C to 600°C for J-thermocouple output
System Accuracy: ±1% of reading or ±1°C, whichever is greater
Thermocouple output accuracy
±1% of reading or ±2.5°C, whichever is greater
System Repeatability: ±0.5% of reading or ±0.5°C (1°F), whichever is greater
Temperature Coefficient:

0.15K per K or 0.15% per K,
0.05K per K or 0.05% per K
0.05K per K or 0.05% per K
whichever is greater*
Temperature Resolution: LT 0.3°C or 0.5°F
System Response Time: 150ms (95%)
Emissivity: 0.100 to 1.100 digitally adjustable increments of .001
Signal Processing: Peak hold, valley hold, variable averaging filter,
adjustable up to 998 seconds
* NIST/DKD certified models available with 0.05K per K

Nominal Optical Specifications
D:S is the optical resolution expressed as a ratio of the distance to
the measurement spot divided by the diameter of the spot.
Optical resolution for the MI is 10:1, 22:1.
Nominal spot size based on 90% energy.

Electrical Specifications
Outputs: Scalable 4-20mA, 0-20mA, 0-5V, J or K thermocouple
Alarm Relay: 10mV/°C Head Ambient signal
Cable Length: 1 m (3.2 ft) standard, 3 m (10 ft), 8 m (26 ft) and
15 m (50 ft) lengths available
Output Impedance (T/C output): 20 ohms
Minimum Load Impedance
(mV output):
100K ohms
Maximum Loop Impedance
(mA output):
500 ohms with 24 VDC power supply
Current Draw: 100 mA
Power Supply: 12-24 VDC

Sensor Specifications
Environmental Rating: NEMA-4 (IP 65)
Ambient Temperature Range:

0°C to 85°C (32°F to 185°F)
0°C to 125°C (32°F to 257°F)
0ºC to 180ºC (32ºF to 356ºF)
Electronics housing 0°C to 65°C (32°F to 150°F)
Storage Temperature: -18°C to 85°C (0°F to 185°F)
Relative Humidity: 10 to 95%, non-condensing
Sensing head
Electronics housing

Stainless steel
Zinc, die-cast
Sensing head (w/1 m cable)
Electronics housing

50 g (1.75 oz)
270 g (9.5 oz)
Shock IEC 68-2-27 (MIC ST 810D)-50g’s, 11 ms on any axis 
Vibration 68-2-27 (MIC ST 810D)-3g’s, 11-200 Hz on any axis
Sensor Dimensions

Accessories / Options
Each standard MI package includes a sensing head, one mounting nut, 1 m (3.2 ft) of cable, die-cast housing with premounted electronics, and an operator’s manual. Longer cables up to 15 m (50 ft) maximum are available and must be specified at time of order.

Multidrop Network Installation

Modular Infrared Thermometer
Code A
Standard model includes selectable 4-20mA/0-20mA, 0-5 V, or J/K thermocouple output and head temperature output 85 ºC (185 ºF) ambient operating range .05k/k temperature coefficient
MID with DKD/NIST calibration certificate and optimized performance 125 ºC (257 ºF) ambient operating range .05k/k temperature coefficient
MID with DKD/NIST calibration certificate and optimized performance 180 ºC (356 ºF) ambient operating range .05k/k temperature coefficient
Code B
10:1 D:S sensor with 1m wiring cable
22:1 D:S sensor with 1m wiring cable
Code C
Temperature Range
-40 ºC to 600 ºC (-40 ºF to 1112 ºF); 8 – 14 microns
Code D
RS-485 communication for multidrop networks
CB 3
3 m (9.8’) cable
8 m (26’) cable
15 m (49’) cable
Display window for electronics housing
Typical Model



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