Pure Water — Heating of demineralized or
de-ionized water that is highly aggressive to
Mildly Corrosive Solutions — Heat mildly
corrosive solutions (pH5 to pH9) using stainless
elements and a passivated stainless pipe
Highly Corrosive Solutions and Oils — Low
watt density INCOLOY® sheath elements
coupled with a passivated Stainless Steel
pipe body provides long service life when
heating highly corrosive solutions and sulfur
Steam Superheating — Increase the
enthalpy and quality of steam. Smaller units
can be used to make up line losses in steam
generating and distribution systems.
High Temperature Gas — INCOLOY® elements
and a Stainless Steel vessel enhance
safe operation to nearly 1400°F outlet gas
temperature in air, gas or steam superheating
Terminal Enclosures — Standard stock
heater terminal enclosure E1 General Purpose.
Moisture Resistant/Explosion Proof E2 or
Moisture Resistant E4 Enclosures are available
as assembly stock.
Elements — Sturdy 0.475" Dia. Stainless Steel
or INCOLOY® sheath elements provide superior
strength and rigidity. Chromalox elements
utilize high quality resistance wire for coil
construction. The coil is surrounded with high
purity magnesium oxide which is compacted to
a dense solid to ensure high thermal conductivity
and dielectric strength.
Corrosion Resistance — NWHIS and
NWHOIS pipe bodies and all Stainless Steel
heating elements are passivated to provide
additional resistance to corrosion.
Flanges — Type 304 Stainless Steel flanges
are standard on 3" and larger circulation heaters.
Flange dimensions conform to ANSI B16.5
Vessels — Pipe body and nozzles are type 304
ASTM A312 ERW Stainless Steel pipe. The end
disks are type 304 ASTM A240 Stainless Steel
plate. Provided with thermal insulation and
painted sheet metal jacket.
Baffle Assemblies — Internal baffle assemblies
are provided for model GCHISB-18
heaters to increase the velocity of the air, gas
or steam as it passes through the vessel.
Increasing the velocity of the gas helps reduce
the temperature of the element sheaths and the
vessel walls in critical applications.
Wiring — Wiring terminals are spaced to
provide proper arcing and creepage clearances.
Termination insulators provide electrical isolation
between the terminals and the grounded
metal sheath to enhance personnel safety and
equipment service life. Heavy duty jumper
straps and other terminal parts assure tight
connections and an extra margin of current
Controls — All stock and assembly stock heaters,
Series MTSS, 03 and 06, come equipped
with mechanical AR thermostats. These
thermostats are suitable for most applications.
Explosion-resistant and liquid- tight thermostats
are provided on E2 and E4 units, respectively.
Individual product pages list other types
of thermostats and controls available for each
heater. For heaters listed without controls, refer
to the Overview on Mechanical and Electrical
Control Options in this section.
Precision Temperature Control and Control
Panels — For larger kW heaters and precise
control of gas temperatures in high temperature
applications, Chromalox recommends the
use of thermocouple sensors, electronic PID
temperature controls and SCR power panels
for circulation heater applications. The use
of electronic and SCR controls will minimize
overshoot and reduce the possibility of heater
damage from overtemperature operation.
Integral or remote mounted control panels with
electronic controls and solid state (SCR) or
contactor power controllers can be provided
using virtually any combination of control devices.
Consult the Controls section for details.