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Calex ExTemp - Intrinsically safe infrared temperature sensor

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ExTemp intrinsically safe non-contact infrared temperature sensors measure the temperature of an area of the surface of a solid or liquid, and transmit this as a two-wire, linear 4-20 mA output. Its ATEX and IECEx rating makes it suitable for many applications in hazardous areas.

Part Number: ExTemp

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Overview
Field of View
Applications
Specifications

Measure a wide variety of materials from -20°C to 1000°C in one device

ExTemp intrinsically safe non-contact infrared temperature sensors measure the temperature of an area of the surface of a solid or liquid, and transmit this as a two-wire, linear 4-20 mA output.

Temperature ranges from -20°C to 1000°C are available. All models have an adjustable emissivity setting, and may be used to measure a wide variety of target materials, including food, paper, textiles, plastics, leather, tobacco, pharmaceuticals, chemicals, rubber, coal, asphalt and paint.

A choice of precision optics is available to measure small or large targets at short or long distances.

The optional LCT Loop Configuration Tools (USB and RS-485 adapters) and free software allow the ExTemp to be connected to a PC, PLC or SCADA system for temperature indication, sensor configuration and data acquisition.

These sensors are designed primarily for use in hazardous areas in conjunction with a suitable safety barrier or isolator. All models have been certified Intrinsically Safe for use in gas and dust hazardous areas by Certification Management Ltd. They comply with the European ATEX Directive 2014/34/EU and are covered by certificates for IECEx (international) and UKCA (United Kingdom). The ExTemp Series is also approved for use in Japan (JNIOSHTR-46-1:2020 (General requirements); JNIOSH-TR-46-6:2015 (Intrinsic Safety “i”)).

Features

Suitable for hazardous areas, Zone 0, 1 and 2 (gas), and Zone 20, 21 and 22 (dust), with a suitable Intrinsically Safe isolator
Temperature range: -20°C to 1000°C
Two wire, 4-20 mA output
Rescalable output and adjustable emissivity setting via optional USB and RS-485 adapters
Fast response time and high stability
Stainless steel 316 housing - ideal for offshore applications
IP65 sealed
Supplied with up to 25 m cable

Target size and distance are critical to accuracy for most IR thermometers

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 the PyroEpsilon detects 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 Calex for more information.

Typical Applications

The ExTemp’s IIC T4, IIIC T135°C, ATEX and IECEx rating makes it suitable for many applications in hazardous areas, including:

Petrochemical - condition monitoring

Bearing, gearbox and motor housing surface temperatures in refineries and chemical plants can be monitored without contact, eliminating the need to replace contact probes that are easily damaged by vibration.

Petrochemical - liquid storage and processing

The sensor can be positioned in a Zone 0 environment such as the top of a tank of hazardous liquid or reactor, to measure the surface temperature of the liquid.

Paper

Dust in pulp, paper and packaging plants can create a fire and explosion hazard. The ExTemp intrinsically safe pyrometer can be used for paper web temperature measurement and condition monitoring in ATEX and IECEx classified hazardous areas.

Coal conveyors

The ExTemp's fast 240 ms response time makes it ideal for measuring the surface temperature of coal on conveyors, as well as other bulk materials where there is an explosive dust hazard.

Gas cylinder filling

The surface temperature of cylinders of explosive gases is monitored with the ExTemp as they are filled. The Group IIC, T4 classification makes it suitable for almost all gases including propane, butane, hydrogen and acetylene. The temperature of each cylinder is measured on the filling rig to help detect fault conditions in filling, to calculate the final filled volume (in conjunction with the pressure), to ensure the volume is repeatable, and to improve the filling rate.

Automotive painting

Solvents in automotive painting can create a gas explosion risk. The intrinsically safe ExTemp may be used to monitor the temperature of containers and vessels, the surface temperature of liquids and powders, and the temperature of painted surfaces.

Offshore

The ExTemp's 316 stainless steel housing and intrinsically safe certification makes it well-suited for use on offshore platforms. As well as measuring the temperature of surfaces on the rig, it can be used to measure the temperature of the sea surface.

Technical Information
Temperature Range	See table of Model Numbers
Maximum Temperature Span	1000°C
Minimum Temperature Span	100°C
Output	4 to 20 mA
Field of View	See table of Model Numbers
Accuracy	± 1°C or 1%, whichever is greater
Repeatability	± 0.5°C or 0.5%, whichever is greater
Emissivity Setting Range	0.20 to 1.00 (pre-set to 0.95)
Emissivity Setting Method	Configurable via optional adapters
Response Time	240 ms (90% response)
Spectral Range	8 to 14 μm
Supply Voltage	12 to 24 V DC ± 5%
Maximum Current Draw	25 mA
Maximum Loop Impedance	See Application Guide (available separately)
Mechanical
Construction	Stainless Steel 316
Major Dimensions	Ø 20 x length 150 mm (see Dimensions)
Mounting	M20 x 1.5 mm thread, length 46 mm, supplied with two mounting nuts
Cable Length	5 m, 10 m or 25 m as standard (contact Calex for information on extending the cable)
Weight with 5 m Cable	475 g
Environmental
Environmental Rating	IP65 (NEMA 4)
Ambient Temperature Range	0°C to 70°C (Operating range)
Ambient Pressure Range	80 kPa (0.8 bar) to 110 kPa (1.1 bar)
Relative Humidity	Max. 95% non-condensing
CE Marked	Yes
RoHS Compliant	Yes
Hazardous Area Classification
The ExTemp is ATEX, IECEx, TIIS and UKCA Ex (UKEX) certified.
ATEX Classification	Ex II 1GD
IECEx Classification (Gas)	Ex ia IIC T4 Ga
IECEx Classification (Dust)	Ex ia IIIC T135°C IP65 Da
Ambient Temperature Rating	-20°C ≤ Ta ≤ 70°C
Maximum DC Input Voltage	Ui = 28 V
Maximum Input Current	Ii = 93 mA
Maximum Input Power	Pi = 650 mW
Maximum Internal Capacitance	Ci = 8 nF
Maximum Internal Inductance	Li = 0 mH
ATEX Certificate Number	CML 14ATEX2079
IECEx Certificate Number	IECEx CML 14.0032
JapanEx Certificate Number	CML 23JPN2141
UKCA Certificate Number	CML 21UKEX2001

Measure a wide variety of materials from -20°C to 1000°C in one device

ExTemp intrinsically safe non-contact infrared temperature sensors measure the temperature of an area of the surface of a solid or liquid, and transmit this as a two-wire, linear 4-20 mA output.

A choice of precision optics is available to measure small or large targets at short or long distances.

Features

Suitable for hazardous areas, Zone 0, 1 and 2 (gas), and Zone 20, 21 and 22 (dust), with a suitable Intrinsically Safe isolator
Temperature range: -20°C to 1000°C
Two wire, 4-20 mA output
Rescalable output and adjustable emissivity setting via optional USB and RS-485 adapters
Fast response time and high stability
Stainless steel 316 housing - ideal for offshore applications
IP65 sealed
Supplied with up to 25 m cable

Calex ExTemp - Intrinsically safe infrared temperature sensor

Measure a wide variety of materials from -20°C to 1000°C in one device

Features

Target size and distance are critical to accuracy for most IR thermometers

Typical Applications

Petrochemical - condition monitoring

Petrochemical - liquid storage and processing

Paper

Coal conveyors

Gas cylinder filling

Automotive painting

Offshore

Technical Information

Mechanical

Environmental

Hazardous Area Classification

Measure a wide variety of materials from -20°C to 1000°C in one device

Features

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