Salt Bath 709 / 718 / 818
Installation and Operating Manual
North American Model
June 2019
Page
1
of
36
Salt Bath Manual Index
Statement of Use – Overview
1
Standard/Everyday Use
Wear Personal Protective Equipment
20
Safety
Turn on Any Ventilation Systems
20
Warning Symbol Descriptions
2
Power Up the TAP Control
20
Emergency Shutoff Provision
2
Verify Chamber Thermocouple Position
20
Electrical Safety
3
Start the Heat Treat Process
20
Salt Bath Kiln Location Safety
3
Inserting the Immersion Thermocouple into the Molten Salt Bath
21
Kiln Use Safety
4
Inserting Work-Pieces for Heat Treating
23
Kiln Maintenance Safety
5
Pulling Your Work-Piece from the Salt Bath
24
Shutting Down the Process
24
Setting Up the Salt Bath Kiln
Stand Assembly & Kiln Placement
6
Evenheat Salt Bath Kiln Features
Thermocouple Installation
8
Two Control Thermocouples
25
Over-Temp Thermocouple
8
Immersion Thermocouple Mount
25
Chamber Thermocouple
9
Over-Temp Thermocouple Circuit
25
Immersion Thermocouple
11
Grounded Salt Pot and TC’s
25
Salt Pot Ground Strap Installation to Control Panel
12
TAP Control
25
Prepare the Salt Pot Ground Lug
13
Solid State
26
Placing the Salt Pot into the Chamber
13
Replaceable Drip Shields
26
Placing the Lid onto the Chamber
14
Swing View
26
Installing the Fiber Gasketing Material Around Salt Pot
14
Lid Design
26
Installing the Lid Drip Shield
15
3” Brick
26
Salt Pot Ground Strap Installation to Salt Pot Grounding Lug
15
Chamber and Floor Easily Replaced
26
Charging (Filling) Your Salt Pot
Salt Bath Maintenance
27
Put on Your Personal Protective Equipment
16
Salt Leaks
28
Turn on Any Ventilation Systems
16
Replacement Parts List
29
Charge (Fill) the Salt Pot with Your Heat Treat Salts
16
Salt Pot Design Specifications
29
Powering Up the TAP Control
16
Nu-Sal Heat Treat Salt Working Temperatures
30
Operating the TAP Control
16
Safety Data Sheet (SDS) for Nu-Sal Heat Treat Salt
30
Programming the TAP Control to Achieve Molten Salt
17
Chamber Thermocouple Controls Heat-up
17
Adding Additional Salt to Make Final Volume
18
Switching to the Immersion Thermocouple
18
Charging Complete
19
Proper Shutdown
19
Statement of Use - Overview of Salt Bath Operation
The salt bath heat treating process involves heating solid heat treating salts to a given temperature which causes them to liquefy by heat (become molten). These
salts are contained within a vessel that is commonly known as a salt pot. Once the salts become molten, and at the desired heat treat temperature, steel work-pieces
(blades, receivers, tools, etc.) are immersed into the molten salts and are allowed to remain there for the desired time period. Once the desired time period has
elapsed, the work-pieces are removed from the molten salt to undergo further processing as necessary.
Advantages of the salt bath heat treat process include a heat treat environment that is absent of oxygen. Oxygen oxidizes and decarburizes steel when taken to
temperature: neither effect is generally preferred in the finished product. Also a salt bath, by its nature, tends to offer phenomenal temperature distribution
throughout the work piece.
