The GP Series is a versatile, two-piece temperature monitoring system that combines a compact, value-priced monitor with an infrared sensing head. The heart of the system is the 1/8 DIN GP monitor which provides advanced infrared processing capabilities including peak and valley hold, averaging, and a user-adjustable offset. The rugged Thermalert GPR sensor is available with standard or close focus optics, and provides target temperature readings with1% accuracy.Along with its large 4-digit LED display, the monitor provides a user-defined 4–20mA or thermocouple output. Two adjustable set points/ deadbands control 5V alarm outputs or optional 3A mechanical relays. All monitor functions are configured via the front panel, including °C/°F switching.The GP monitor provides adjustable emissivity and ambient compensation when used with  the GPR/ GPS infrared sensors. These high  performance, 8–14 micron sensors, combine current loop driven signals with high resolution optics.

  • Temperature range from -18°C to 538°C  (0°F to 1000°F)
  • Compact 1/8 DIN digital monitor with large 4-digit display
  • Monitor and sensor functions configured on front panel
  • Signal Processing capabilities typically found on much larger systems
  • Adjustable emissivity and T - ambient parameters
  • Universal 110–220 VAC power included
  • User-defined 4–20 mA or thermocouple output (J, K, E, N, R, S, T)
  • Adjustable dual setpoints, deadband alarm outputs and optional mechanical relays
  • Choice of sensing head to match application requirements
  • Field interchangeable sensing heads
  • Standard and close focus optics available
  • Accessories for cooling and air purging
  • GPS Laser Sighted Head w/ 50:1  optical resolution

Measurement Specifications

Monitor with Sensing  Head

Spectral Response GPR/ GPS


8 to 14 microns

Temperature Range GPR/GPS

-18°C to 538°C (0°F to 1000°F)

System Accuracy (mA output)

±1% of measured value or ±1°C (2°F),

whichever is greater *

System Repeatability

±0.5% of measured value or

±1°C (2°F) whichever is greater

Response Time (95%) GPR/GPS

300 mSec


0.1 to 1.09 digitally adjustable increments of .01

Signal Processing* @ 23°C ±5°C (73°F ±9°F)

Peak and valley hold (up to 998 sec,

999=infinite hold with external reset).

Variable averaging filter (up to 60 seconds).

T-ambient: fixed background ambient

temperature compensation



Electrical Specifications

Power Supply

110/220 VAC, ±20%, 50–60 Hz


User configurable inputs for GPR, GPS, any

0-5 V or 4-20 mA sensor, or thermocouple

(J, K, E, N, R, S, T) External reset input to reset peak/valley hold


4-digit, 7 segment LED display, °C/°F selectable

User configurable 4-20 mA current or thermocouple

output (J, K, E, N, R, S, T)

Two adjustable setpoints with deadbands

controlling +5 V alarm outputs or optional 3A

mechanical relays 24 VDC/50 mA excitation voltage


Sensor Specifications

Environmental Rating:

GP monitor front panel

GPR/GPS sensing head

* GPR/GPS rated with adapter and compression fittin


IP 54 (IEC 529); NEMA-12

IP 65 (IEC 529); NEMA-4*

Ambient Temperature Range

GP monitor

GPR/GPS sensing head

GPS laser shuts off automatically at 50°C (120°F)

with optional water cooling

with optional air cooling


0°C to 50°C (32°F to 120°F)

0°C to 65°C (32°F to 150°F)


0°C to 177°C (32°F to 350°F)

0°C to 120°C (32°F to 250°F)

Storage Temperature

-30°C to 65°C (-22°F to 150°F)

Relative Humidity

10 to 95%, non-condensing

GP Monitor Dimensions

1/8 DIN x 120 mm (1.75 x 3.63 x 4.75 in)

GP Monitor Weight

320 g (0.7 lbs)

Physical Ratings

GPR/GPS vibration


GPR/GPS shock


MIL-STD-8100, (IEC 68-2-6):

3 G's, 11 to 200Hz any axis

MIL-STD-8100, (IEC 68-2-27):

50 G's, 11 msec any axis


  • Printing, Paper, Converting, Textiles, Sealing, Bending, Drying and Curing
  • Asphalt, Construction materials
  • Plastics Processing, Extrusion, Thermoforming, Molding, Welding and Sealing
  • Ovens & Dryers
  • Food Processing & Pharmaceuticals
  • Industrial OEM’s
  • Machine Condition Monitoring & Maintenance

Fields marked with * are mandatory fields.


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