Technical Design-in Guide Engine QLE G2 PRE KIT | 01-2019 | 1.0 | en
Thermal Aspects
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7.2.6. Temperature measurement on the module
t point QLE
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There is a t point on top of the module for checking the temperature of the latter:
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The temperature at the t point can be measured with a simple temperature probe. Since the underside of the modules is made from
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anodised aluminium, any measurements taken with an infra-red camera would lead to inaccurate results.
In practice, thermocouples (e.g. B&B Thermotechnik, K-type thermocouple) have proved successful. Such thermocouples can be
attached directly to the t point with heat-resistant adhesive tape or a suitable adhesive. The measured values are recorded by an
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electronic thermometer (e.g., "FLUKE 51", VOLTCRAFT K202 data logger).
The maximum possible temperature must be determined under worst-case conditions (ambient temperature, installation of the
luminaire) for the relevant application. Before the measurement is taken, the luminaire should be operated for at least 4 hours in a
draught-free room.
The measurement must be taken in a steady thermal state and in a draughtfree room.
7.2.7. Temperature management of the LED Driver
Although the LED Driver have an integrated temperature management system, the requirements relating to cooling of the LED Driver
must also be taken into account. Unintentional automatic dimming at overtemperature, for example, indicates inadequate cooling of
the LED Driver.
The LED Driver temperature can be measured with a simple temperature probe at the t point. The t point of the LED Driver is
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indicated by a sticker on the casing.
