Registered Quality System to ISO 9001:2008
26/60
Form 912
sorinc.com
913-888-2630
Step 1: Model Series
The 741-743 and 802 Series mechanical level switches are displacer-operated with flanged, ser-
viceable external chambers. 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
*Consult the factory for pressure ratings of units with Monel trim. Standard displacer units are
not available above 450°F (232°C).
741 A-A1C -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 alternate materials.
Step 2: Chamber Material
741 A-A1C-B-A1-N4-CRTT
741-743 and
802 Series
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)
741
A106B
316SS
285
275
(19.7)
(18.9)
260
240
(17.4)
(16.5)
230
215
(15.8)
(14.8)
215
205
(14.8)
(14.1)
200
195
(13.7)
(13.4)
185
182
(12.7)
(12.5)
742
A106B
316SS
740
720
(51.0)
(49.6)
680
620
(46.9)
(42.7)
655
560
(45.1)
(38.6)
645
537
(44.4)
(37.0)
635
515
(43.7)
(35.5)
618
497
(42.6)
(34.2)
743
A106B
316SS
1480
1440
(102.0)
(99.3)
1294
1240
(89.2)
(85.5)
1166
1120
(80.4)
(77.2)
1118
1075
(77.1)
(74.1)
1070
1025
(73.8)
(70.7)
1034
990
(71.3)
(68.3)
802
A106B
316SS
3376
3504
(232.8)
(241.6)
3019
3019
(208.2)
(208.2)
2721
2721
(187.6)
(187.6)
2609
2609
(179.9)
(179.9)
2497
2497
(172.2)
(172.2)
2414
2414
(166.4)
(166.4)
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
Minimum Specific Gravity
Model
Series
Standard
Anti-Vibration
or Pneumatic
741
0.43 0.57742
743
802 0.41 0.5
Step 3: Process Connection
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