There are several approaches to do it, normally an immersion heating is used.
Several benefits makes the immersion heating been used on more than 70% of salt spray chambers.
- Heat up quickly.
- Easy to use.
- Easy to maintain.
- Lower costs.
Figure 1 Immersion Heating
But, the main disadvantage of immersion heating is that there are much vapor in the mixed air in test area. When performing NSS, the vapor is still acceptable. But when performing CASS or AASS, the vapor will increase salt fog’s pH value way higher than desired 2.8-3.2.
The dry heating is developed as another approach to maintain the chamber’s temperature. The main benefit is that this heating do not create any vapor in test area, which will be able to maintain the salt fog’s pH and concentration values during whole testing.
Figure 2 Dry Heating
Weice’s dry heating element is made by titanium which is the best material to resist corrosion, the heater surface is also teflon coated which enhance its resistant ability to excellent.
WTS/M2 Salt Spray Chambers
Weice’s M2 Salt Spray Chambers have all the benefits of standard WTS chambers, the dry heating makes these chambers are able to perform NSS, CASS and AASS by one chamber.
Extra protective system is also employed to protect the dry heating element.
Figure 3 WTS60/M2 Salt Spray Chamber