Primes PROFINET - Number of Measuring Cycles (Repetitive Measurements)

PowerMeasuringModule PMM
35,0(
6
40
Revision 13 EN - 02/2023
Absorber temperature
in °C
Min. energy input
in J
Max. energy input
in J
20 400 3500
25 400 3320
30 400 3100
35 400 2880
40 400 2660
45 400 2440
50 400 2210
55 400 1990
60 400 1770
65 400 1550
70 520 1330
Tab. 8.1: Absorber temperature with the recommended minimum and maximum energy input (ambient temperature
22°C)
8.4 Number of measuring cycles (repetitive measurements)
With a start temperature of 20°C, the absorber can accomodate a heat quantity (= energy) of approx.
3500J. PRIMES recommends an energy input of approx. 400 J to 1000 J per measurement in order to
achieve the highest possible measurement accuracy.
Measurements can be repeated in rapid succession until the absorber reaches 80 °C. Then, a cooling cycle
in the range of 1-2 minutes is required until further measurements are possible. For repetitive measurements,
see chapter 8.5 on page41.
NOTICE
Damage/Destruction of the device
The maximum absorber temperature of 80°C must not be exceeded.

Note the possible number of measurements according to Tab. 8.2 on page40.
With an assumed laser power of 8kW and 4kW, the following numbers of measurements are possible:
Laser power in Watt Exposure time in ms Energy input in J Possible number of measurements
8000
100 800 4
200 1600 2
400 3200 1
4000
100 400 8
200 800 4
400 1600 2
Tab. 8.2: Possible number of measurements
The absorber cools itself down by releasing heat into the environment.