Specialty Heaters
FLUENT® In-line Heaters
Watlow’s FLUENT® in-line fluid heater is a small,
lightweight, high-performance heater that can replace
both a traditional immersion type heater or a heater
wrapped around a tube as part of a thermal system.
Watlow’s FLUENT heater is designed as an integrated
solution that replaces multiple components in a system.
This heater design reduces overall system cost and
complexity. Because of its high watt density, it offers
ultra-fast response leading to higher system performance.
Featuring Watlow’s patented layered heater technology,
the heater makes use of its entire surface to produce
heat, which optimizes heat transfer and temperature
uniformity.
Features and Benefits
Small, lightweight, robust heater construction
• Replaces multiple components in a system
• Reduces overall system size
• Lowers total cost of ownership
Patented circuit patterning process
• Facilitates customizable heating profiles
• Enables distributed wattage and/or multiple zones
• Assures precise and repeatable power distribution
High watt density, low mass heater
• Contributes to fast response time
• Allows for efficient heat transfer
• Enables on-demand process start-up
Typical Applications
• Hemodialysis fluid heating
• Food cooking equipment
• Semiconductor purge and carrier gas heating
• Ink preheating systems
• On-demand fluid heating
445
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Specialty Heaters
FLUENT In-line Heaters
Technical Information
Specifications
• Substrate tube material: 444 SS
• Fitting and baffle material: 316L SS
• Voltage up to 240V
• Amperage up to 15A per zone
• Resistance tolerance +10%, -5%
• Typical maximum watt densities
• Air 150 W/in2 (23 W/cm2)
• Water 450 W/in2 (70 W/cm2)
• Maximum pressure: 150psi (10.2 bar)
• Maximum temperature: 662°F (350°C) as
measured by internal T/C
• UL®/cUL® and CE
Application Orientation
Gas Heating—
(Any orientation)
Inlet
Liquid Heating—
(Heater must be vertical
with inlet at the bottom)
Outlet
Outlet
Optional internal
baffle to promote
turbulent flow
and high
efficiency
Fast responding,
high watt density
layered heater
circuit
Low profile axial
lead exit
Inlet/Outlet Fitting Options
0.520 in.
1
/8 in.
Female
NPT
Ø 0.520 in.
Ø
3
/8 in.
Ø 0.520 in.
Ø
1
/4 in.
Standard Construction
Inlet Fitting
Inlet
20 AWG UL® 1199
PTFE Insulated
Lead Wire
INLET
FLOW DIRECTION
Standard Lead
Length 12 in.
Protection Tube Length
0.375 in.
1 in.
24 AWG Type K
T/C Wire
OUTLET
1 in.
Protection Tube
Outlet Fitting
446
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Specialty Heaters
FLUENT In-line Heaters
Technical Information
Standard Product Offering: Base Heaters
Protection Tube
Volts Watts
240 500 3.00 (76) 1 210
120 250 4.25 (108) 1 57
240 1,000 4.25 (108) 1 228
120 375 5.25 (133) 1 62
240 1,500 5.25 (133) 1 247
120 500 6.50 (165) 1 63
240 2,000 6.50 (165) 1 250
120 750 6.50 (165) 2 94
240 3,000 6.50 (165) 2 375
120 1,000 7.75 (197) 2 100
240 4,000 7.75 (197) 2 400
240 500 6.50 (165) 1 63
Note: Visit www.watlow.com/fluent for the latest list of standard designs and
product information.
Length
in. (mm)
Number of
Heating
Circuits
Watt Density
(W/in2)
How to Specify a Standard
Product:
• Select a base heater from the
chart to the left.
• Choose the desired inlet and
outlet fittings from page 446.
Pressure Drop - Air - With Internal Baffle @ 250°C
Note: Internal baffle is required for all gas heating applications.
447
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Specialty Heaters
Pressure Drop - Water - With Baffle
FLUENT In-line Heaters
Technical Information
Pressure Drop - Water - With Internal Baffle
1000
900
800
14
12
700
600
500
400
300
Pressure-Drop (mbar)
200
100
0
0.25 0.5 0.75 1 1.25 1.5 1.75 2 2.25 2.5
Flow (I/min.)
Heater 4.25 in., Fitting
1
in. Heater 4.25 in., Fitting
/
4
3
in. Heater 6.5 in., Fitting
/
8
Pressure Drop - Water - Without Internal Baffle
3
in. Heater 6.5 in., Fitting
/
8
10
8
6
Pressure Drop (PSI)
4
2
0
1
in.
/
4
Heater internal temperature will vary based on flow rate, heater watt density and presence of the internal baffle, which
increases turbulent flow. General guidelines for baffle consideration:
• For flow rates below 1 l/min, baffle should always be used to prevent an over-temperature condition.
• For flow rates over 1 l/min, removing the baffle is possible but will result in a higher internal temperature.
448
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