Page 934 - MiSUMi FA Mechanical Components Economy Series

Economy Series
Cartridge Heaters Selection Method

2 Heater Selection

· Determine the required heater heat (W)
20 It can be calculated with the following formula according to the mass, specific heat, rising temperature and heating time required to reach the
set temperature of the heated object.
Heaters / Temperature Sensors / Heat Insulating Plates The efficiency varies with heat preservation, thermal insulation, heater settings, etc, so it is difficult to calculate correctly, but generally 0.2to
Mass of the heated object (kg) × Specific heat of the heated object (kcal/kg°C) × rising temperature of the heated object (°C)
Required Heater Heat (kW)=
860 × Heating Time (h) × Efficiency (K)

0.5 is appropriate.
Specific Gravity · Specific Heat of Main Materials
mass of about 8kg heated to 180°C.
The heating time of a block heater from 20°C to the set temperature is set to 30 minutes.
Material Specific Gravity Specific Heat Example: if you want to make 200×100×50(mm) stainless steel block heater with a
(g/cm )
(kcal/kg°C)
3
Cartridge Heaters Aluminum(A7075PCategory) 2.80 0.230 Required Heater Heat (kW)= 8×0.11×(180-20) =1.1(kW)
860×0.5×0.3
0.113
Steel
7.85
Stainless Steel 7.82 0.110 =1100(W)
P.929 Brass 8.70 0.100 * For standard specifications, the efficiency is set to 0.3.
Temperature Sensors · Determine the number of heaters and the heat of each heater (W).
* Please refer to the following chart for the measured data of temperature rise time classified by power.
The number of heaters is determined according to the size of the heated object, and the total heat (W) is the heat required by the heated object.
P.937 Example: Use 2 heaters of 550(W) (1100W in total).
Temperature Controllers 2 Cartridge Heater Selection
Determine the diameter of the heater
P.949 Determine the length of the heater
Heat Insulating Plates 2 Measured data of temperature rise time classified by power
Determine the heat required by the heated object (W)

P.953 500
450
Power 78W
400 Power Density 5W/cm 2
350 Power 118W
Temperature (°C) 250 Power 157W
Power Density 7.5W/cm 2
300
Power Density 10W/cm 2
200
150 Power 196W
Power Density 12.5W/cm 2
100
Power 235W
50 Power Density 15W/cm 2
0
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (minutes)
* Heater Used: DiameterП10, Length 65mm (Heating Part 50mm)
* Heated Object: Aluminum (60×50×20)
* The temperature is the central surface temperature of aluminum.

2Temperature Control Temperature Sensors
· Although the position of the temperature sensor should be
determined according to the setting conditions of the heated object
(metal block), it is recommended to set it as close to the heater as
possible, in order to prevent the heater from overheating.
10mm
* Normally, the distance between the heater and the temperature sensor is about 10mm. Cartridge Heaters Metal Block
931