Bartec PSB, Design Manual

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Design Guide for Hazardous / Industrial Self-regulating trace heating systems
21-1S00-7D0001/-
05/2023-EHT-466853 Notice Technical data subject to change without notice.
No claims for damage arising from alternations, errors or misprints shall be allowed. Page 12 / 42
Step 3: Choose a trace heater family
Determine the requirements for your trace heating application:

Maximum exposure temperature (power on / power off)

Minimum operation / installation temperature

Required heat output to compensate for the effective heat loss as calculated in Step 2

Required temperature class (“T-Rating”)
Select the trace heater family that meets your requirements using the following table:
Table C: Trace heater family selection
PSB MSB
Max. continous operating
temperature, energized 65 °C
110 °C
Max. continuous exposure
temperature, de-energized 85 °C
130 °C
Min. start-up temperature -55 °C -60 °C
Min. installation temperature -55 °C -60 °C
Power output
11
10, 15, 25, 33 W/m
10, 15, 30, 45, 60 W/m
Nominal voltage
110 to 120 Vac
208 to 277 Vac 110 to 120 Vac
208 to 277 Vac
Braid resistance < 18.2 Ω/km < 18.2 Ω/km
Minimum bending radius 25 mm
Do not bend on the narrow axis.
10 mm
Do not bend on the narrow axis.
Heater dimensions
11.6 x 5.6 mm (fluoropolymer outer jacket)
10.2 x 4.8 mm
11.8 x 5.8 mm (polyolefin outer jacket)
Temperature classes
12
Product approach:
10 W/m → T6
15 W/m → T6
25 W/m → T5
33 W/m → T5
Product approach:
10 W/m → T4
15 W/m → T4
30 W/m → T3
45 W/m → T3
60 W/m → T3
Systems approach:
Operating temperature / T-Class is obtained by
Heloc Pro calculation tool with respect to maximum
Heating circuit length.
NOTICE
If you want to use plastic piping within your installation, contact your local BARTEC distributor for verification that the design does not exceed the
maximum withstand temperature of the pipe material. Also, adjustments in heat loss calculations may be required.
→ Example
 Maximum exposure temperature: 50 °C (“power on”), 70 °C (“power off”)
 Minimum operation temperature: -20 °C

Required heat output: 20.4 W/m

Required temperature class: T5
Trace heater family that meets the requirements: PSB
11
nominal heat output at 10 °C
12
applies for the trace heater models with 208 to 277 Vac rated voltage; temperature classes according to IEC/IEEE 60079-30-1:2015 (max. surface temperature)