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Calex FibreMini Infrared Thermometer

Fibre Optic Infrared Temperature Sensor for Harsh Applications
Part Number: FibreMini
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Features

  • Temperature ranges from 250°C to 2000°C
  • Miniature sensing head withstands 200°C ambient temperature
  • Short measurement wavelength for improved accuracy on metals
  • No electronics in the sensing head - ideal for use near induction heaters and strong electromagnetic fields
  • Choice of analogue or digital output; alarm relays on all models
  • Built-in laser sighting

Typical Applications

Iron & Steel
The harsh high-temperature environments near furnaces in the metals industry require rugged measurement equipment. 
The sensing head and fibre optic cable of the FibreMini can be placed in ambient temperatures of up to 200°C, and they are small and flexible enough to be fed through protective conduit with very tight bends.
The touch screen interface can be operated with gloves on, and used as a local display, while still transmitting the temperature back to the control room.
 
Pipe Welding
Measure the preheat temperature of steel pipes before welding, between the induction coils.

Ordering Code

[FM2.2]-[251]-[HT]-[CRT]-[5M]

Series
FM2.2 FibreMini with 2.2 µm spectral response

Field of View
301 30:1 divergent optics
751 75:1 divergent optics

Temperature Range
MT 250°C to 1000°C
HT 450°C to 2000°C

Output and Interface
CRT 4-20 mA output, two alarm relay outputs, with touch screen
BRT RS485 Modbus output, two alarm relay outputs, with touch screen

Fibre Optic Cable Length
3M 3 metres
5M 5 metres
10M 10 metres

Features

  • Temperature ranges from 250°C to 2000°C
  • Miniature sensing head withstands 200°C ambient temperature
  • Short measurement wavelength for improved accuracy on metals
  • No electronics in the sensing head - ideal for use near induction heaters and strong electromagnetic fields
  • Choice of analogue or digital output; alarm relays on all models
  • Built-in laser sighting

Typical Applications

Iron & Steel
The harsh high-temperature environments near furnaces in the metals industry require rugged measurement equipment. 
The sensing head and fibre optic cable of the FibreMini can be placed in ambient temperatures of up to 200°C, and they are small and flexible enough to be fed through protective conduit with very tight bends.
The touch screen interface can be operated with gloves on, and used as a local display, while still transmitting the temperature back to the control room.
 
Pipe Welding
Measure the preheat temperature of steel pipes before welding, between the induction coils.

Ordering Code

[FM2.2]-[251]-[HT]-[CRT]-[5M]

Series
FM2.2 FibreMini with 2.2 µm spectral response

Field of View
301 30:1 divergent optics
751 75:1 divergent optics

Temperature Range
MT 250°C to 1000°C
HT 450°C to 2000°C

Output and Interface
CRT 4-20 mA output, two alarm relay outputs, with touch screen
BRT RS485 Modbus output, two alarm relay outputs, with touch screen

Fibre Optic Cable Length
3M 3 metres
5M 5 metres
10M 10 metres

General Specifications

Temperature Range MT models: 250°C to 1000°C
HT models: 450°C to 2000°C
Max. Temperature Span (-CRT models) Full temperature range (up to 1550°C)
Min. Temperature Span (-CRT models) 100°C
Output 4-20 mA or RS485 Modbus (Up to 247 sensors may be installed on a single Modbus network)
Field of View Choice of wide-angle or focussed optics (see Field of View Diagrams below)
Accuracy ±1% of reading
Repeatability ±0.5% of reading
Emissivity Setting Adjustable, 0.10 to 1.00
Emissivity Setting Method -BRT models: via RS485 Modbus
-CRT and -BRT models: via touch screen
Response Time, t90 ≥240 ms (90% response)
Spectral Range 2.0 to 2.6 μm
Supply Voltage 24 V DC ± 5%
Maximum Current Draw 100 mA
Max. Loop Impedance (-CRT models) 900 Ω (4-20 mA output)
Alarm Relays 2 x Single Pole Changeover alarm relays, rated 24 V DC, 1 A, isolated 500 V DC
 

Data Logging Specifications

Data Logging Interval 1 to 86,400 seconds (1 day)
MicroSD Card Max. capacity: 32 GB (not included)
Internal Clock Battery 1 x BR 1225 3V (not included)
Variables Logged Target temperature, sensing head temperature, electronics module temperature, max, min, average, emissivity setting, reflected energy compensation Temperature, alarm events
File format .csv
Configurable Parameters Sample period, number of samples, scheduled start date and time
 

Touch Screen Interface Specifications

Touch Screen Display Format 2.83” (72 mm) resistive touch TFT, 320 x 240 pixels, backlit
Configurable Parameters Temperature range, temperature units, emissivity setting, reflected energy compensation, alarms, signal processing, Modbus address (-BRT models), date and time, data logging
Temperature Units °C or °F configurable
Temperature Resolution 0.1°
Alarm Configuration Two alarms with adjustable level, individually configurable as HI or LO. Alarm 2 can be set to target temperature or sensing head internal temperature
Signal Processing Average, peak hold, valley hold, minimum, maximum
 

Field of View Diagrams

Please note: The given measured spot diameter contains 90% of the energy detected by the sensor. For maximum accuracy, we normally recommend the target is at least twice as large as the given measured spot. The sensor may be used at longer distances than shown above. In clean air there is no maximum measurement distance, and the distance does not affect the sensor's measurement accuracy; this is because the sensor is filtered to detect only the wavelengths of IR that are not absorbed by the atmosphere.

Mechanical Specifications

Construction (Sensing Head) Stainless Steel 316
Construction (Electronics Module) Die Cast Aluminium
Major Dimensions (Sensing Head) 12(dia.) x 48(l) mm (see Installation)
Major Dimensions (Electronics Module) 98(w) x 64(h) x 36(d) mm
Mounting (Sensing Head) M12 x 1.5 mm thread
Mounting (Electronics Module) Requires two M4 screws for wall mounting (see Installation)
Fibre Optic Cable Length (sensing head to electronics module) 3 m, 5 m or 10 m
Cable Connections Removable screw terminal blocks (see "Connections")
Conductor size: 28 AWG to 18 AWG
Output Cable Gland Suitable for cable diameters 3.0 to 6.5 mm

Environmental Specifications

  Sensing Head Electronics Module (without touch screen) Electronics Module (with touch screen)
Environmental Rating IP65 (NEMA 4) IP65 (NEMA 4)
Ambient Temperature Range 0°C to 200°C 0°C to 60°C 0°C to 60°C
Relative Humidity Maximum 95% non-condensing Maximum 95% non-condensing Maximum 95% non-condensing
CE Marked Yes Yes Yes
RoHS Compliant Yes Yes Yes

Electromagnetic Compatibility Standards

Conforms to EMC Directive EN61326-1:2006 (Electrical equipment for measurement, control and laboratory use – Industrial) as well as industrial standards for electromagnetic immunity and emissions.

Typical Applications

Iron & Steel

The harsh high-temperature environments near furnaces in the metals industry require rugged measurement equipment. 
The sensing head and fibre optic cable of the FibreMini can be placed in ambient temperatures of up to 200°C, and they are small and flexible enough to be fed through protective conduit with very tight bends.
The touch screen interface can be operated with gloves on, and used as a local display, while still transmitting the temperature back to the control room.
 

Pipe Welding

Measure the preheat temperature of steel pipes before welding, between the induction coils.
 

Metals and Harsh High-Temperature Applications

Measuring the temperature of reflective metals is a challenge. Reflective surfaces, hot furnaces and high ambient temperatures can make it difficult to achieve accurate results with non-contact sensors.

The new FibreMini fibre-optic pyrometer from Calex has innovative features that are specialised for accurate measurements in this industry.

Problem: Measuring the Temperature of Metals is Difficult

Have you ever tried to measure the surface temperature of shiny metal using a handheld IR thermometer? You might have seen that changing the measurement angle affected the reading, or that it was difficult to make the thermometer display a believable temperature, especially when aiming it into a furnace.

General-purpose, long-wavelength temperature guns are not suitable for use on metals because they are more susceptible to errors than short-wavelength sensors if the emissivity setting is incorrect. A small error in the emissivity setting can cause a big error in the measurement.

Add to this the problem that the area surrounding the furnace is a harsh place to mount an infrared temperature sensor, with the ambient temperature commonly exceeding 100°C, and you have a very challenging application that rules out most choices of sensor.

Solution: The New FibreMini

The solution is to use a short-wavelength pyrometer like the new FibreMini, which has the following advantages for the metals industry:

  • Fibre optic sensing head withstands up to 200°C ambient temperature, making it ideal for mounting near furnaces.
  • No electronics in the sensing head make it immune to electromagnetic interference in high-EMC applications such as induction heating.
  • Reflected energy compensation allows for an accurate reading when measuring reflective objects inside furnaces. Simply enter the temperature of the furnace interior and the sensor will compensate for the reflections for a much more accurate reading. This can also be adjusted automatically on Modbus models for maximum accuracy during heating or cooling cycles.
  • Laser aiming light illuminates the measurement area, showing both the location and the size of the measured spot. This makes the sensor very easy to aim.
  • Large, full-colour temperature display with data logging makes the FibreMini a truly plug-and-play solution – simply connect a power supply and start measuring. A choice of 4-20 mA or RS485 Modbus outputs is available for connection to your process instrumentation.
  • Fully configurable via touch screen with no need for any additional configuration hardware or software.

All the above features are included as standard on every FibreMini model.

A choice of temperature ranges from 250°C to 2000°C is available, as is a choice of optics for measuring small or large areas at short or long distances.

Feeding the sensing head through conduit and trunking is easy, thanks to the slim, highly flexible fibre optic cable, which is available in lengths of 3, 5 or 10 metres.

The short measurement wavelength allows the sensor to measure through many ordinary viewports made of glass or quartz, as well as specialist IR-transmissive materials.

Non-Ferrous Metals

Caution! Measuring the temperature of non-ferrous metals, especially aluminium and copper, is extremely difficult with any IR sensor. Contact OneTemp for advice before attempting this.

By Anthony Smith - Calex

Accessories for this instrument listed below

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