Ratio pyrometer for hot applications

Measurement technology company Micro-Epsilon has extended its range of temperature sensors with a new ratio pyrometer. The new thermoMETER CT ratio will be on display at the SPS|IPC|DRIVES exhibition in Nürnberg.

The sensor is a non-contact temperature sensor, which is only dependent on the emissivity ratio but not on the absolute emissivity. The sensor measures by using two short wavelengths close to each other and forms a ratio from this. The emissivity of the target is therefore no longer required for measurements. A faultless measurement is also possible even in the case of a 95% weakening of the IR radiation due to smoke or steam.

The sensor provides a measuring range of 700°C to 1,800°C at a maximum ambient temperature of 250°C without cooling and is primarily used in metal processing applications. The sensor electronics unit enables connection to Profibus, Ethernet, USB, RS232 or RS485. The thermoMETER CT ratio operates with an optical fibre between sensor and electronics. Therefore, electromagnetic radiation has no influence on the sensor.

A sighting laser is projected onto the target by the lens of the sensor; this enables constant mapping of the real measuring spot size. The standard focus of the lens is at a distance of 60mm. Using an additional, variable focussing lens, the user can set the focus point between 65mm and 300mm. The pyrometer can be used as a standard single-channel IR sensor or as a ratio pyrometer.