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Chromalox
®
DIVISION
4
SECTION
TBL
SALES
REFERENCE
DATE
SERVICE REFERENCE
PD433
161-058061-001
MARCH, 1984
Installation Instructions
and
RENEWAL PARTS IDENTIFICATION
© 2010 Chromalox, Inc.
GENERAL
Chromalox type TBL and TBL-A over-the-side immersion heaters
are designed primarily for salt baths but are available in a variety of
sheath materials and watt densities for most liquids and viscious mate-
rials..
WARNING: It is the responsibility of the purchaser of the
heater to make the ultimate choice of sheath material
based upon his knowledge of the chemical composition
of the corrosive solution, character of the materials
entering the solution, and controls which he maintains
on the process. Chromalox cannot warrant any electric
immersion heater against failure by sheath corrosion if
such failure is the result of operating conditions beyond
our control.
1. Heater Construction Characteristics
A. High quality Nichrome resistance wire held in place by com-
pacted Magnesium Oxide in various sheath materials.
B. Medium watt densities.
C. Steel terminal box painted with heat and acid-resistant paint.
D. Lightweight yet heavy duty.
E. Riser type construction puts the heat at the bottom inducing
natural “stirring action” and evenly distributed temperatures.
CAUTION: Users should install adequate controls and
safety devices with their electric heating equipment.
Where the consequences of failure may be severe, back-
up controls are essential. Although the safety of the
installation is the responsibility of the user, Chromalox
will be glad to make equipment recommendations.
Type TBL and TBL-A
Over-The-Side Salt Bath Heaters
INSTALLATION
1. Before installing the type TBL heater, inspect it for possible dam-
age which may have occurred during shipment. Also, check to
insure that the line voltage is the same as that stamped on the
nameplate.
2. IMPORTANT: Mount heater in the tank so that the liquid level
will always be above the effective heated portion of the heater. If
the heater is not properly submerged, it will overheat and damage
the heating elements and create a possible fire hazard due to exces-
sive sheath temperatures.
3. Where work will pass over or near equipment, additional protec-
tion, such as a metal guard, may be needed.
4. In an electroplating operation the heaters are not, under any cir-
cumstance, to be placed between the electrodes and the work.
5. When melting solids by direct immersion, a surface vent should be
provided to allow gases to escape. Operate the heater on half volt-
age until melted material completely covers the heater area.
6. A drip loop is recommended to minimize passage of moisture
along wiring into terminal box and connections.
7. DANGER: Hazard of Fire. Since these heaters are capable of
developing high temperatures, extreme care should be taken to:
A. Use Explosion-resistant terminal housings in hazardous loca-
tions. See Chromalox catalog for selection of explosion-resis-
tant terminal enclosures for hazardous locations.
B. Avoid contact between heater and combustible material.
C. Keep combustible materials far enough away to be free of the
effects of high temperatures.
3-19/32
A
3/4
2-5/8
B
6" Max.
Heated
4
3/4" Conduit Hub
Model Dimensions (In.)
Steel INCOLOY
®
Volts kW
Sheath Sheath (Single Phase) 20 W/In
2
AB
TBL-1301 TBL-A-131 3 11-1/8 13-7/8
TBL-4501 TBL-A-451 4.5 11-1/8 15
TBL-6001 TBL-A-601
240 or 480
6 11-1/8 20-5/16
TBL-7501 TBL-A-751 7.5 14-5/8 25-9/16