Induction hardening

The induction hardening is a heat treatment for surface hardening, mainly used for complicated shaped workpieces or for partially hardening of specific parts of an item. One of the most important parameters at induction hardening is the correct temperature of the item to guarantee the required quality of the product. This temperature is approximately 900 °C depending on the material.

In the most cases the item will be quenched with water after having reached the correct hardening temperature. Pyrometers enable a fast and very accurate measurement and a complete documentation of the surface temperature of each single part. The output of the pyrometer is used for the controlling of this very fast heating process. Pyrometers with very short response times and small spotsizes are used for these applications so that the correct measurement of the item can be done even between the windings of the induction coil.

The robust stationary pyrometers PYROSPOT DS 40N, DS 42N, DS 44N or DS 10N are used here. Depending on the process and the measuring task often fibre optic pyrometers are used. As the optic head and the fibre optic cable do not contain any electronics these parts can be mounted very close to the induction coil without any interference of the strong electromagnetic field.

Induction heating of a gear. The hardening temperature can be measured fast and exactly without contact with a pyrometer.
Induction heating of a gear. The hardening temperature can be measured fast and exactly without contact with a pyrometer. Image source: leflambela/Wikimedia Commons/CC BY-SA 3.0

All information at a glance:
PDF – Quality Management for induction hardening processes with digital DIAS pyrometers PYROSPOT

Brief overview: Technical data of suitable pyrometers with silicium detector for the temperature measurement in induction hardening processes

Pyrometer DS 40N

Selection of technical data: USB pyrometer PYROSPOT DS 40N
Spectral range 0.8 µm to 1.1 µm
Temperature measurement range 600 °C to 2500 °C
Distance ratio 100 : 1 to 200 : 1
Measurement spot size from 1.2 mm diameter
Response time t95 10 ms
Interface USB (galvanically isolated)
Aiming LED or laser aiming light
Housing Stainless steel housing protection class IP65
Here is the complete technical data of the pyrometer series PYROSPOT 40

Pyrometer DS 42N

Selection of technical data: Well priced pyrometer PYROSPOT DFS 42N with emissivity adjustment for first-time users
Spectral range 0.8 µm to 1.1 µm
Measurement temperature range 600 °C to 2500 °C
Distance ratio 100 : 1 to 200 : 1
Measurement spot size from 1.2 mm diameter
Response time t95 10 ms
Emissivity 0.050 to 1.00, adjustable (factory setting: 1.00)
Aiming integrated laser aiming light
Housing Stainless steel housing, protection class IP65
Here is the complete technical data of the pyrometer series PYROSPOT 42

Pyrometer DS 44N

Selection of technical data: Bus-compatible pyrometer PYROSPOT DS 44N
Spectral range 0.8 µm to 1.1 µm
Temperature measurement range 600 °C to 2500 °C
Distance ratio 100 : 1 to 200 : 1
Measurement spot size from 12 mm diameter
Response time t95 5 ms
Interface RS-485 (galvanically isolated), Modbus RTU data protocol
Aiming LED or laser aiming light
Housing Stainless steel housing with protection class IP65
Here is the complete technical data of the pyrometer series PYROSPOT 44

Pyrometer DS 10N

Selection of technical data: Pyrometer with video function PYROSPOT DS 10N
Spectral range 0.8 µm to 1.1 µm
Temperature measurement range 550 °C to 3000 °C
Distance ratio 200 : 1
Measurement spot size from 1.2 mm diameter
Response time t95 2 ms
Interface RS-485 (galvanically isolated), Modbus RTU data protocol
Aiming LED or laser aiming light, through-lens sighting, color video camera
Housing Compact housing, protection class IP65
Here is the complete technical data of the pyrometer series PYROSPOT 10

An additional advantage of these pyrometers is the very small size of the optic head. Here the pyrometer models PYROSPOT DSF 40N, DSF 44N, DSRF 44N or DSF 11N are used. The pyrometers of series 40 and 42 are 2-wire pyrometers, the instruments of the series 44, 10 and 11 are 4 wire pyrometers and offer additionally to the standard analog output of 4 to 20mA a digital online RS-485 interface (Modbus RTU). This enables a linking of several pyrometers in a bus system or the integration in an already existing bus system.

Brief overview: Selection of suitable fiber optic pyrometers with silicium detector for the temperature measurement on metal without contact

Pyrometer DSF 40N

Selection of technical data: Fiber optic pyrometer with USB PYROSPOT DSF 40N
Spectral range 0.8 µm to 1.1 µm
Temperature measurement range 600 °C to 2500 °C
Distance ratio 50 : 1 to 100 : 1
Measurement spot size from 0.7 mm diameter
Response time t95 10 ms
Interface USB (galvanically isolated)
Aiming LED or laser aiming light
Housing Stainless steel housing, protection class IP65
More information Pyrometer with fiber optic cable and optical head, operating temperature up to 250 °C
Here is the complete technical data of the pyrometer series PYROSPOT 40

Pyrometer DSF 44N

Selection of technical data: Fiber optic pyrometer PYROSPOT DSF 44N
Spectral range 0.8 µm to 1.1 µm
Temperature measurement range 600 °C to 2500 °C
Distance ratio 50 : 1 to 100 : 1
Measurement spot size from 0,7 mm diameter
Response time t95 5 ms
Interface RS-485 (galvanically isolated), Modbus RTU data protocol
Aiming LED or laser aimig light
Housing Stainless steel housing, protection class IP65
More information Pyrometer with fiber optic cable and optical head, operating temperature up to 250 °C
Here is the complete technical data of the pyrometer series PYROSPOT 44

Pyrometer DSRF 44N

Selection of technical data: Fiber optic ratio pyrometer PYROSPOT DRSF 44N
Spectral range 0.7 µm to 1.1 µm
Temperature measurement range 700 °C to 1800 °C
Distance ratio 40 : 1
Measurement spot size from 5 mm diameter
Response time t95 5 ms
Interface RS-485 (galvanically isolated), Modbus RTU data protocol
Aiming Laser aiming light
Housing Stainless steel housing, protection class IP65
More information Ratio pyrometer with fiber optic cable and optical head, operating temperature up to 250 °C, special optic for temperature measurement at not completely filled measurement field and fast moving measurement objects.
Here is the complete technical data of the pyrometer series PYROSPOT 44

Pyrometer DSF 11N

Selection of technical data: Fiber optic pyrometer with display PYROSPOT DSF 11N
Spectral range 0.8 µm to 1.1 µm
Temperature measurement range 600 °C to 3000 °C
Distance ratio 100 : 1 to 150 : 1
Measurement spot size from 5 mm diameter
Response time t95 2 ms
Interface RS-485 (galvanically isolated), Modbus RTU data protocoll
Aiming Laser aiming
Housing Stainless steel housing, protection class IP65
More information Very fast pyrometer with fiber optic cable and optical head, operating temperature up to 250 °C, large OLED display and parameter buttons
Here is the complete technical data of the pyrometer series PYROSPOT 11

The pyrometers are equipped with LED- or laser targeting light or thru-lens viewfinder or a video module for the exact alignment . The software PYROSOFT Spot and PYROSOFT Spot Pro enable the setting of all parameters and thus the optimal adaption to the process as well as a digital analyzing of the temperature values. Solid adjustable mounting angles are available for the easy alignment and strong mounting of the pyrometers. Air purge units are used to keep the lens clean of contamination for a long term maintenance free operation.