PyroCouple Simple Infrared Temperature Sensor with Analogue Output




Single Infrared Temperature Sensor with Analog Output

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The Sensor measures: Temperature of a surface
Output Signal: 4-20 mA, Type K or J thermocouple, or 0-50 mV output options
Cable Length: 1 meter

The PyroCouple non-contact infrared sensor measures temperatures from -20 to 500º C and has a 4-20 mA, voltage or thermocouple output. This range of output signals is compatible with most indicators, controllers, recorders, data loggers, etc., without the need for special interconnection or signal conditioning. They are suitable for most materials, such as food, paper, cloth, plastics, leather, tobacco, medicine, chemicals, rubber, coal, and asphalt; however, they are not for materials with a low emissivity, for example, polished metals. There are two-wire and four-wire versions of the PyroCouple sensors. Two-wire PyroCouple sensors transmit the target temperature as a 4-20 mA output and provide a simple solution for most non-contact temperature measurement applications.

Four-wire PyroCouple sensors transmit the target temperature as a 0-50 mV output or as a thermocouple output (type J, K, or T) plus the internal temperature of the sensor as a 4-20 mA output. This second output can be used to ensure that the sensor is being used within proper ambient temperature limits and possible damage from overheating or subcooling is prevented. They can also be used to provide a rough indication of the temperature of the air surrounding the sensor.


Temperature range: -20°C to 500°C
Fixed emissivity setting: 0.95
4-20 mA, Type K, J or T thermocouple, or 0-50 mV output options
Fast response with high stability
Stainless steel 316 housing
Sealed to IP65
Ideal for measuring non-reflective non-metals, or painted metal surfaces

General Specifications

Temperature Range:
-20°C to 100°C (LT models)
0°C to 250°C (MT models)
0°C to 500°C (HT models)
Optics: Choice of optics for small or large targets at short or long distances - see Field of View Diagrams
Output (Measured Temperature): Two-wire 4-20 mA (-0 models)
0-50 mV (-1 models):
Type T Thermocouple (-2 models)
Type J Thermocouple (-3 models)
Type K Thermocouple (-4 models)
0-50 mV, low current consumption (-5 models)
Output (Sensor Body Temperature): 4-20 mA on power loop (models with output options 1 to 4 only)
Accuracy: ±1% of reading or ±1ºC, whichever is greater
Repeatability: ± 0.5% of reading or ± 0.5ºC, whichever is greater
Emissivity: Fixed at 0.95
Response Time, t90: 240 ms (90% response)
Spectral Range: 8 to 14 μm
Supply Voltage: 24 V DC (28 V DC max.)
Min. Sensor Voltage: 6 V DC
Max. Loop Impedance: 900 Ω ( 4-20 mA output)
Output Impedance: 56 Ω (voltage/thermocouple output)

Field of View Diagrams

Please note: The given measured spot size contains 90% of the energy detected by the sensor. We normally recommend the target is at least twice as large as the given measured spot for maximum accuracy. Sensors may be used at longer distances than the above diagrams show. There is no maximum measurement distance in clean air; this is because Calex sensors detect only the wavelengths of infrared radiation that are not absorbed by the atmosphere. 2:1 optics are not available on sensors with temperature range 0°C to 500°C as standard. Please contact us for more information.

Electrical Installation:

Two-wire models (output option 0):


For food temperature measurement, a fixed-emissivity sensor such as the PyroCouple is usually suitable. A range of controllers and indicators is also available. A famous manufacturer uses the PyroCouple to measure chocolate temperature before the mould as it is heated in temperature controlled "kettles", and the temperature of toffee webs as they leave cooling drums.

Measuring tarmac road surface temperature when paving and in infrared pothole repair. Asphalt temperature measurement after heating and in discharge chutes.

Temperature and moisture monitoring and control in corrugated board manufacturing, paper drying and condition monitoring.

Thermoforming temperature control and monitoring.

Power industry:
Monitoring the temperature of painted surfaces in switchgear.

Microwave dryers:
In food, paper, pharmaceutical and textile industries, among others, infrared temperature sensors can be positioned outside the microwave field and aimed at the object being dried.

Infrared curing of paint and adhesives:
If the emissivity of the target is high, the reflection of the infrared curing heater does not significantly influence the measurement, and the PyroCouple gives good results.


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.

Fixed Mounting Bracket

The L-shaped fixed mounting bracket offers a rigid support for the sensor

and allows fine rotational adjustment about one axis.

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 two-axis adjustment.


Air/Water Cooled Housing

The air/water cooled housing allows the sensor to withstand ambient temperatures above the normal 70°C limit.
Depending on the degree of cooling required, air or water may be used as the cooling fluid.
To prevent condensation forming on the lens, an air purge collar is included with this item.
The air/water cooled housing must be ordered with the sensor and cannot be fitted by the user.


Laser Sighting Tool

The Laser Sighting Tool screws onto the front of the sensor during installation and shows

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 operated via a latching push button on the front of the tool.


Dual Laser Sighting Bracket

The Dual Laser Sighting Bracket is a sturdy mount for the sensor and provides continuous

target sighting while measurements are being taken. Two parallel lasers indicate the centre

of the measured spot and are controlled by a remote switch on the electronics module.


PID Controllers and Indicators

The PyroCouple may be connected to any of our Pixsys controllers for temperature display, PID control and alarm relay outputs


Model Number Optics Temperature Range   Output
PC151LT-0 15:1 -20°C to 100°C 4-20 mA
PC151MT-0 15:1 0°C to 250°C 4-20 mA
PC151HT-0 15:1 0°C to 500°C 4-20 mA
PC21LT-0 2:1 -20°C to 100°C 4-20 mA
PC21MT-0 2:1 0°C to 250°C 4-20 mA
PC21MT-4 2:1 0°C to 250°C Type K thermocouple
PC301MT-0 30:1 0°C to 250°C 4-20 mA

More combinations of optics, temperature range and output are available (see Ordering Information).

Extended Cable:
The sensor is supplied with a 1-metre cable as standard.

We can provide the sensor factory-fitted with a longer cable (up to 30 metres).

Alternatively you can extend it to any length, depending on the sensor’s output type (4-20 mA is best suited for long distances).

All sensors are calibrated within the published specification at the time of manufacturing. We can provide a 3-point UKAS traceable calibration certificate with new sensors, and we can re-calibrate existing ones. Contact us for details.

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