The FibreMini is an industrial pyrometer with a fibre optic sensing head and a separate electronics module with touch screen interface.
The sensing head is designed to withstand high ambient temperatures of up to 200°C without cooling. This pyrometer is ideal for target materials including steel, iron and carbon, as well as other metals and non-metals.
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)
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)
±0.5% of reading
0.10 to 1.00 for measurements between 250°C to 350°C
0.05 to 1.00 for measurements above 350°C
Emissivity Setting Method
-BRT models: via RS485 Modbus
-CRT and -BRT models: via touch screen
Response Time, t90
125 ms (90% response)
2.0 to 2.6 μm
24 V DC ± 5%
Maximum Current Draw
Max. Loop Impedance (-CRT models)
900 Ω (4-20 mA output)
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)
Max. capacity: 32 GB (not included)
Internal Clock Battery
1 x BR 1225 3V (not included)
Target temperature, sensing head temperature, electronics module temperature, max, min, average, emissivity setting, reflected energy compensation Temperature, alarm events
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
Temperature range, temperature units, emissivity setting, reflected energy compensation, alarms, signal processing, Modbus address (-BRT models), date and time, data logging
°C or °F configurable
Two alarms with adjustable level, individually configurable as HI or LO. Alarm 2 can be set to target temperature or sensing head internal temperature
Average, peak hold, valley hold, minimum, maximum
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.
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
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
||IP65 (NEMA 4)
|Ambient Temperature Range
||0°C to 200°C
||0°C to 60°C
||Maximum 95% non-condensing
||Maximum 95% non-condensing
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.
The FibreMini is ideal for use where the ambient temperature is high, and/or the target has a reflective metal surface. The following suggestions are just a few of the industrial applications where the FibreMini can be used.
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.
Measure the preheat temperature of steel pipes before welding, between the induction coils. For measuring temperatures below 250°C in this application, please see the PyroUSB 2.2.
The FibreMini produced good results at the press exit of an aluminium extrusion line, where the surface of the aluminium profile was repeatable and the emissivity was found to be consistent. Special considerations normally apply to aluminium temperature measurement, however it is possible to achieve good results with single-wavelength sensors such as the FibreMini in situations where the emissivity and temperature are both repeatable.
In this application, the PyroCube M was also used for measuring the profile temperature after the water quench.
||FM2.2 FibreMini pyrometer with 2.2 µm spectral response, miniature sensing head on fibre optic cable, built-in laser sighting, electronics module with 2 alarm relay outputs and touch screen interface
|Field of View
||301 30:1 divergent optics
751 75:1 divergent optics
||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