Registered Quality System to ISO 9001:2008
23/60
Form 912
sorinc.com
913-888-2630
The 400 Series mechanical level switch is float operated suitable for horizontal-insertion mounting.
Select the sensing unit from the following charts. Then refer to pages 44 - 50 for switching
elements, housings and accessories.
Select a model series from the charts below based on maximum operating pressure and minimum
specific gravity.
Maximum Working Pressure
401 A-G3A-B-A1-N4-CRTT
Minimum Specific Gravity
401 A-G3A-B-A1-N4-CRTT
Select chamber material from the following chart. Maximum working pressure in the chart above is
based on the material selected here. Consult the factory for alternative materials.
Step 2: Chamber Material
Step 1: Model Series
*Consult the factory for pressure ratings of units with Monel trim
400 Series
Designator Material
A A106 Grade B Carbon Steel with A105 and A234-WPB fittings
C A312-TP316/316L Stainless Steel with A182-316/316L and A403-316/316L fittings
Model Single Switch
401 .50
402 .90
403 .50
404 .60
405 .60
406 .60
Model
Series
Chamber
Material
Pressure at Listed Temperature in psig (bar)*
100°F (38°C) 200°F (93°C) 300°F (149°C) 350°F (177°C) 400°F (204°C) 450°F (232°C)
401
A106B
316SS
230 (15.8) 230 (15.8) 230 (15.8) 224 (15.4) 218 (15.0) 212 (14.6)
402
A106B
316SS
350 (24.1) 350 (24.1) 350 (24.1) 340 (23.4) 331 (22.8) 322 (22.2)
403
A106B
316SS
230 (15.8) 230 (15.8)
230
215
(15.8)
(14.8)
215
205
(14.8)
(14.1)
200
195
(13.7)
(13.4)
185
182
(12.7)
(12.5)
404
A106B
316SS
500 (34.4) 500 (34.4) 500 (34.4) 486 (33.5) 473 (32.6) 460 (31.7)
405
A106B
316SS
740
720
(51.0)
(49.6)
675
620
(46.5)
(42.7)
655
560
(46.1)
(38.6)
645
537
(44.4)
(37.0)
635
515
(43.7)
(35.5)
618
497
(42.6)
(34.2)
406
A106B
316SS
1250 (86.2)
1250
1240
(86.2)
(85.5)
1250
1120
(86.2)
(77.2)
1216
1075
(83.8)
(74.1)
1182
1030
(81.5)
(71.0)
1150
992
(79.3)
(68.4)
Note: Insertion depth may affect minimum specific gravity.
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