The Thermalert TX infrared temperature sensors are available in two configurations:

1.TX Basic Sensors offer outstanding performance when used in single-unit installations.

2.TX Smart Sensors, which have remote addressability, can be easily installed in multidrop configurations including special ones for monitoring glass and plastics processes. TX Series Smart Sensors communicate over a simple loop-powered 2-wire cable using the HART (Highway Addressable Remote Transducer) protocol. This signal combines industry-standard 4-20 mA output with simultaneous digital communications.

  • Simple, two-wire installation
  • Simultaneous 4-20 mA and digital output for smart TX sensors
  • Compact, rugged sensor with NEMA-4(IP 65) rating
  • Wide temperature range from -18ºC to 2000°C
  • Advanced signal processing
  • Point-to-point or multidrop installation
  • Install up to 15 sensors on a single multidrop  network
  • Windows software for remote configuration  and monitoring
  • Wide choice of focus distances
  • Special models for glass and plastics applications

Measurement Specifications


Spectral Response

Temperature  Range

LT (Low Temp) 

LT0 (Low Temp)

MT (Medium Temp)

HT (High Temp)

G5 (Glass)  

P7 (Plastics) 

8 to 14 μm 

8 to 14 μm 

3.9 μm  

2.2 μm   

5.0 μm

7.9 μm     

-18°C to 500°C (0°F to 1000°F)

0°C to 500°C (32°F to 932°F)

200°C to 1000°C (400°F to 1800°F)

500°C to 2000°C (950°F to 3600°F)

250°C to 1650°C (500°F to 3000°F)

10°C to 360°C (50°F to 650°F)


±1% of measured value or ±1.4°C (2.5°F),

whichever is greater, @23°C ±5°C (73°F ±9°F)


±0.5% of measured value or ±0.7°C (1.2°F),

whichever is greater



0.1°C (0.2°F) for all models except LT;

0.1°C (0.2°F) LT only

Response Time (95%)   

165 mSec (100 mSec for HT models)


Adjustable; 0.10 to 1.00 for all models

Signal Processing

(smart models) 

ºC/ºF, Advanced Peak/Valley Hold, Averaging,

Ambient temperature compensation

Electrical Specifications



 4-20 mA (all models), max. Loop resistance

 700 ohms@24 VDC


(Smart models)  


Hart® or RS-232 (with optional adapter)


(Smart models)    


24 V/150 mA; adjustable setpoints,

deadband, normally open/closed settings

Power Supply

12-24 VDC ±20% (Basic models); 24 VDC

(Smart models)

4-20 mA loop power for both Basic and Smart models

Sensor Specifications

Environmental Rating                

NEMA-4 (IP 65)

Ambient Temperature Range

With air cooling

With water cooling

With ThermoJacket   

0°C to 70°C (32°F to 160°F)

up to 120°C (up to 250°F)

up to 175°C (up to 350°F)

up to 315°C (up to 600°F)

Storage Temperature     

-18°C to 85°C (0°F to 185°F)

Relative Humidity

 10 to 95%, non-condensing


IEC 68-2-27 (MIL STD 810D)

50 g’s, 11 mSec, any axis


IEC 68-2-27 (MIL STD 810D)

3 g’s, any axis, 11-200 Hz



With cooling jacket

187 mm L x 42 mm diameter

(7.4 L in x 1.7 in diameter)

187 mm L x 60 mm diameter

(7.4 L in x 2.4 in diameter)


With cooling jacket 

330 g (0.72 lbs)

595 g (1.3 lbs)


  • Cement
  • Steel
  • Power
  • Pulp & Paper
  • Plastic

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