Registered Quality System to ISO 9001:2008
20/60
Form 912
sorinc.com
913-888-2630
Minimum specific gravity will be lower for shorter insertion depths. Consult the factory.
301 A-F1A-B-A1-N4-CRTT
301 A-F1A-B-A1-N4-CRTT
Select process connection material from the following chart.
Step 1: Model Series
Step 2: Process Connection Material
The 300 series mechanical level switches are float-operated switches suitable for top-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.
*Consult the factory for pressure ratings of units with Monel trim.
Minimum Specific Gravity
300 Series
Model
Series
Pressure at Listed Temperature in psid (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)
301 225 (15.5) 225 (15.5) 225 (15.5) 219 (15.1) 213 (14.6) 207 (14.2)
303 500 (34.4) 500 (34.4) 500 (34.4) 486 (33.5) 473 (32.6) 460 (31.7)
304 750 (51.7) 750 (51.7) 750 (51.7) 729 (50.2) 709 (48.8) 690 (47.5)
Model Series Insertion Depth*
Minimum Specific Gravity Single Switch
(Dual Switch, anti-vibration, pneumatic or extra-high temperature)
316SS / 400SS
Trim (B)
All 316SS Trim (C) All Monel Trim (M)
301
24”
48”
.40
.44
(.45)
(.49)
.42
.46
(.48)
(.52)
.48
.53
(.54)
(.59)
303
24”
48”
.68
.75
(.79)
(.87)
.72
.80
(.84)
(.91)
.82
.91
(.93)
(1.02)
304
24”
48”
.52
.56
(.58)
(.62)
.55
.59
(.61)
(.65)
.62
.67
(.68)
(.73)
Designator Material
A A106 Carbon Steel
C A182-TP316/316L Stainless Steel
*Insertion depth is defined as the approximate value of a rising level setpoint at a Specific Gravity of 1.0.
If more precise setpoint action is required, please select the SC option from the accessories section of the
catalog. Please note: An insertion depth or SC information must be supplied at the time of order on all 300
series switches.
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