Salt Bath Features
Quiet Drive Solid State Relay
All salt bath models are standard equipped with our Quiet Drive Solid State relay system. The salt bath process can be a lengthy process and traditional, hard-contact mechanical relays tend to fail early and always at the wrong time. The solid state relays have no moving parts and are expected to last the life of the kiln.
Solid state also offers the benefit of tighter temperature control as they can be switched on and off very, very quickly. Hard-contact relays, on the other hand, tend to be limited to one on-off cycle every ten seconds or so. It's a major improvement in performance and reliability.
Lastly, our solid state relays will only turn on and off when the AC voltage is at 0V. While this is designed to help keep the solid state relay running cool it offers a specific benefit to heating element life. Heating elements love to be turned on and off at 0V and they show that love by offering greater life!
TAP Control w/ Specialized Software
The salt bath process requires an enhanced feature-set not found in ordinary temperature controls. The manufacturers of the TAP control (SDS Industries), has designed their control with these enhanced features.
The TAP control allows for multiple thermocouples to control via both the firing chamber and salt bath environments along with a separate over-temp circuit for ultimate safety. SDS also modified their software to work exclusively with our Quiet Drive Solid State relay system to give tighter temperature control, extended heating element life and expected lifetime operation.
A tip of the hat to SDS as they are only controls manufacturer capable of providing these custom features.
The addition of an Over-temp (high-limit) thermocouple adds to the safety factor built into every salt bath kiln.
The over-temp thermocouple circuit is designed to abort the process in the event of exceeding the process temperature.
Grounded Salt Pot and Thermocouples
To protect you against any electrical faults Evenheat has provided electrical grounds on the salt pot and all thermocouples. If a fault (short circuit) occurs the grounding of these features safely dissipates electrical energy.
Evenheat salt bath kilns produce heat electrically via heating elements placed into the firing chamber walls. The nature of the salt bath process exposes the user to electrically conductive features such as the salt pot, molten salts and thermocouples. Each of these features extend into and out of the electrically charged firing chamber. Any fault within the heating element causing it to make contact with any of these features will cause them to conduct electricity.
Evenheat does offer salt pots for sale that are equipped with grounding hardware included. If you intend to provide your own salt pot we require that a grounding mechanism be included in your design.
Pulling a work piece from a salt bath generally brings some of the molten salt out with it in the form of some drops and slight run-off. This is called drag-out: it's hot, it's liquid and it's damaging. Allowing drag-out to make contact with the firebrick lid, control panels and worst of all the controller faceplate, causes extensive damage. For this reason Evenheat provides our salt bath kilns with replaceable, stainless steel drip shields on both the lid and control panel. The drip shields take the hits, not the kiln!
3" Firebrick Construction
Our salt bath kilns are built using premium Thermal-Ceramics K-23, 3" firebrick. This particular brick is a thicker version of the standard and offers excellent thermal properties.
We use this firebrick in all of our high temperature designs including our KO Series of heat treat ovens. Thermal-Ceramics firebrick is made in the USA from some very special Georgia ground. It's the best firebrick available.
Evenheat salt bath kilns are designed with a separate chamber thermocouple designed to control the salt bath kiln during the heat-up, pre-molten stage of the salt bath process. Controlling the pre-molten stage via the chamber temperature allows for reliable and ultimately safe operation. Once the salts become molten, temperature control is then switched over to the immersion thermocouple for precise bath temperature control.
Evenheat salt bath kilns use a dedicated immersion thermocouple designed to control the heat treat process temperature by directly measuring the temperature of the molten salts. While initial heat-up is controlled via the chamber thermocouple, heat treat (molten) temperature is controlled via the immersion thermocouple. Once the salts become molten, temperature control is switched to the immersion thermocouple for precise bath temperature control.
The immersion thermocouple is supplied with a mount that allows it to be properly positioned on the lip of the salt pot.
Swing View Control Enclosure
The TAP control is fitted within our Swing View adjustable control enclosure. The swing view is a pivoting, swing-up enclosure that allows the user to rotate the TAP control up to a comfortable viewing and programming angle and then place it back down for salt bath operation. Once down, the TAP control is protected from drag-out via our control panel drip shield and can easily be seen from across your shop. It's that simple.
The swing view allows us to position the TAP control at the top of the salt bath kiln for relaxed and easy use. No crouching or squinting needed.