1 ¼ inch NPT Screw Plug Immersion

Screw Plug Immersion Heaters are ideal for immersion into liquids and all types of oils, where space and connections are a problem.

Plug Material
E
F
H
Brass
1 ¼
3⁄8
1 ¾
Steel & Stainless
1 ⅜
9⁄16
1 ¾

Product Inquiry

Standard Features

Incoloy® 840 sheath standard on all items-allows for the widest coverage of applications and temperatures, plus gives a margin of safety should there be any unknown corrosives or contaminants in the solution.

High purity MgO powder compacted to provide maximum heat conductivity and optimum dielectric Strength.

Type ‘A’ 80/20 resistance wire sized to provide lowest wire watt density for maximum life.

Fusion welded junction between pin/resistance wire to provide a 360″ circumferential joint, giving superior strength and life.

Re-compacted bends to restore MgO density in bend areas.

Moisture sealed to prevent the entrance of contaminants during storage and service. Silicone end seals on heaters for oil, air and corrosive applications. Epoxy seals for water applications.

#10-32 terminals for wiring connections.
1″ and 1 ¼” NPT have plate terminals with screws.
2″ and 2 ½” NPT have threaded stud type.
Either style provide for easy re-wiring in the field.

Standard Nema 1 housings on all catalog items. Seamless deep drawn housings provide easy accessibility to wiring.

Fixed conduit support bracket. Supply conduit is not disturbed when cover is removed.

Welded construction between elements and plugs on steel and stainless steel headers to give maximum corrosion protection and strength at elevated temperatures. All welds are hydrostatically pressure tested for leaks.

Silver braze construction on elements with brass plugs.

Spacer supports on multiple element units where immersed length exceeds 18″. This feature prevents adjacent elements from touching and overheating plus allows for easier assembly and disassembly from the coupling.

Thermowells for existing or optional thermostats. 1 ¼” NPT have a 5⁄16″ tube to accept 1/4″ diameter bulbs. 2 ½” NPT have a 1/2″ tube for up to 3⁄8″ diameter bulbs

100% inspected for:

Dielectric or Hi-Pot between conductors and sheath.

Insulation resistance.

Wattage

Hydrostatic pressure testing done on screw plug heaters also ensures the sheath is defect-free.

All NEMA I and NEMA 4 Housings are CSA certified.

UL & CSA Recognition on elements

20-23 Watts/Sq. Inch – Oil, Mild Corrosives, Air

Immersed
Length “B”
Watts
Volts
Single
Phase
STEEL PLUG
Oils & Alkali
Solutions
STAINLESS PLUG
Air &
Corrosive
Net
Wt.
(lbs.)
6 3⁄16
500
120
240
FM2-500-1
FM2-500-2
GM2-500-1
GM2-500-2
4
9 3⁄16
750
120
240
FM2-750-1
FM2-750-2
GM2-750-1
GM2-750-2
5
12 3⁄16
1000
120
240
FM2-1000-1
FM2-1000-2
GM2-1000-1
GM2-1000-2
5
16 1⁄8
1250
120
240
FM2-1250-1
FM2-1250-2
GM2-1250-1
GM2-1250-2
6
19 1⁄4
1500
120
240
FM2-1500-1
FM2-1500-2
GM2-1500-1
GM2-1500-2
6
25 3⁄8
2000
120
240
FM2-2000-1
FM2-2000-2
GM2-2000-1
GM2-2000-2
7
36 5⁄8
3000
120
240
FM2-3000-1
FM2-3000-2
GM2-3000-1
GM2-3000-2
8

60-86 Watts/Sq. Inch – Water & Mild Solutions

Immersed
Length “B”
Watts
Volts
Single
Phase
BRASS PLUG
Water
Solutions
STAINLESS PLUG
Mild
Corrosive
Net
Wt.
(lbs.)
6 ¼
500
120
240
DH1-500-1
DH1-500-2
GH1-500-1
GH1-500-2
4
750
120
240
DH1-750-1
DH1-750-2
GH1-750-1
GH1-750-2
4
1000
120
240
DH2-1000-1
DH2-1000-2
GH2-1000-1
GH2-1000-2
4
1500
120
240
DH2-1500-1
DH2-1500-2
GH2-1500-1
GH2-1500-2
4
2000
120
240
DH2-2000-1
DH2-2000-2
GH2-2000-1
GH2-2000-2
4
8 ⅜
2500
120
240
DH2-2500-1
DH2-2500-2
GH2-2500-1
GH2-2500-2
5
9 ½
3000
120
240
DH2-3000-1
DH2-3000-2
GH2-3000-1
GH2-3000-2
5
12 ½
4000
240
DH2-4000-2
GH2-4000-2
5
22 ¼
5000
240
DH2-5000-2
GH2-5000-2
6
26 ⅜
6000
240
DH2-6000-2
GH2-6000-2
 6

Brochures

Closed Tank Heating

Watt Density

Percentage of Wattage

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heating solution?

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