OMEGALUX™ strip heaters are used mainly for convection-kind air heating and clamp-on installations. When deciding on strip heater elements for either, two important factors have to be considered:
The proper sheath cloth for resisting any rusting and oxidizing inherent inside the system or surroundings and for withstanding the sheath temperature required. Standard sheath substances are rust resisting iron, chrome steel and Incoloy (NS Series handiest). Stainless metallic and Monel sheaths are available at an additional fee. Maximum paintings and sheath temperatures are beneath.
The watt density of the heater detail, or watts according to rectangular inch of heated vicinity. This should be low for heating asphalt, molasses and other thick materials with low warmth transferability; it is able to be better for heating air, metals and other warmth engaging in substances. (See curves for determining allowable watt densities).
Selecting Sizes and Ratings
The calculation of total heat requirements for an application is outlined in the Technical Section. For help, get in touch with an OMEGALUX™ packages engineer who will be glad to assist resolve your heating trouble. Once overall warmth necessities are mounted, the quantity, size and rankings may be determined. Plan for enough strip heater element to permit even temperature as required by way of the manner. The sensor for the temperature manage ought to be clamped to the operating floor for correct manipulate. In the case of air heating, place sensor where the desired temperature is needed, however no longer too a ways from heater to help avoid undershoot and overshoot.
After the unique heater detail length and score has been tentatively selected, the watt density have to be checked against an appropriate curves. For example, the OT-4315 stainless-steel sheath heater rated 1500 watts has a watt density of 11 watts/sq. In. And may be operated at 1200°F sheath temperature. If clamped to a work surface working at six hundred°F, Figure C-1 suggests that the maximum allowable watt density is 12 watts/sq. In. Since the watt density of the OT-4315 is under the most allowed, right clamping will provide lengthy service. If the strip heater selected has a watt density better than that stipulated by way of the graph, then those options may be considered:
Use greater heaters of a low watt density to achieve the specified kW potential.
Reduce the kW ability wished by using decreasing warmth losses and making an allowance for a longer warmness-up time.