TERMINAL HOUSINGS
Screw Plug
NEMA 4/7 Moisture/Explosion Resistant
Suction Oil Heaters
Plug Size
C
D
E
F
G
1″
3 516
4 ½
1
6 ⅛
1 ¼ NPT
2″ & 2 ½”
4 ⅜
5 ¾
1 ¼
7 ⅝
1 ½ NPT
Flanged
NEMA 4 Moisture Resistant
Circulation Heater Option - Flanged NEMA4
Flange Size
“A” Maximum
3″ – 150#
4 ½”
5″ – 150#
6 ¾”
8″ – 150#
8 ¾”
10″ – 150#
10 ¾”
12″ – 150#
12 ¾”
14″ – 150#
14 ¾”
Flanged
NEMA 7 Moisture Resistant
Circulation Heater Option - Flanged NEMA4
Flange Size
“A” Maximum
3″ – 150#
4 ½”
5″ – 150#
6 ¾”
8″ – 150#
8 ¾”
TEMPERATURE CONTROLS
Bulb & Capillary
Style
Range
Code No.
Availability
Single Pole
30-110°F
T1
All 1″ Screw Plugs
60-250°F
T2
Std. on 1″ Plugs
175-550°F
T3
All 1″ Screw Plugs
Double Pole
0-100°F
T4
All Plugs & Flanges
60-250°F
T5
Std. on 3″, 5″, 8″ Flange
150-500°F
T6
All Plugs & Flanges
Solid State
Style
Range
Code No.
Availability
Non-Indicating Sub-Panel
0-300°F
86-03
All Plugs & Flanges
0-800°F
86-08
All Plugs & Flanges
500-1500°F
86-515
All Plugs & Flanges
OTHER OPTIONS
High Temp. Standoff Housing
Conduit Connections - Circulation Heaters
Over Temp. Thermocouple to Sheath
Over Temp. Thermocouple to Sheath  - Circulation Heaters
(Standard on High Capacity Heaters)
Additional Options
a.
Weatherproof insulation shroud
b.
High temp. ceramic fiber insulation. (Standard on high capacity units.)
c.
All stainless steel construction.
d.
Passivation on all wetted surfaces
e.
ASME section VIII construction on vessel
f.
High pressure construction