Watlow Heater Catalog

Specialty Heaters

FLUENT In-line Heaters Technical Information

Pressure Drop - Water - With Int rnal Baffle

Pressure Drop - Water - With Baffle

1000

14

900

12

800

700

10

600

8

500

6

400

300

Pressure Drop (PSI)

4

Pressure-Drop (mbar)

200

2

100

0

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 / 4 in.

Heater 4.25 in., Fitting 3 / 8 in.

Heater 6.5 in., Fitting 3 / 8 in.

Heater 6.5 in., Fitting 1 / 4 in.

Pressure Drop - Water - Without Baffle

Pressure Drop - Water - Without Internal Baffle

140

2

1.75

120

1.5

100

1.25

80

1

60

0.75

40

Pressure-Drop (mbar)

Pressure Drop (PSI)

0.5

20

0.25

0

0

1

1.25

1.5

1.75

2

2.25

2.5

2.75

3

3.25

3.5

3.75

4

Flow (I/min.)

Heater 4.25 in., Fitting 1 / 4 in.

Heater 4.25 in., Fitting 3 / 8 in.

Heater 6.5 in., Fitting 3 / 8 in.

Heater 6.5 in., Fitting 1 / 4 in.

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.

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