Gems Sensors Series Level Switch
Small Size – Engineered Plastics, All-Teflon® Wetted Parts for Ultra-Pure Fluids
Quick Specs...
- Low Particle Generation-One piece Molded Design
- Corrosion Resistant
- 1 to 4 Actuation Levels in a Single Unit
- Lengths to 24"
Overview / Design Principle:
Typical Applications:
- Semiconductor Process Equipment
- Pure Chemical Delivery System
- Wafer Cleaning and Etching Systems
- Cabinet Leak Sensing
How To Order:
To Request a Quote: Use the information on this page to complete our online checklist. Gems will promptly provide you with a quotation for your specific application.
Mounting Types:
Each mounting type can be configured with stem lengths Lo and float materials indicated in the table below.
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Type 21
1" NPT
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Type 22
1/4" NPT
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Type 31
3/8" NPT
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Electrical:
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Type 1 Leadwire
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Type 2 Cable
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Type 3 Liquid-Tight Cable
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Extended Leads
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#22 AWG Teflon Wire or #24 AWG PVC Jacketed Cable
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*Available on Mounting Type 22 only.
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Typically, one float is required for each point at which you need a switch action to occur. The number of actuation levels available depends on the Group Type Wiring selected; see below
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Group I Wiring |
1 to 4 Actuation Levels |
Group II Wiring |
1 or 2 Actuation Levels |
Switch (SPST, N.O. or N.C.) |
10/20/50/100 VA. |
Float Types:
Float Material
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Operating Temperature
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Pressure, PSI (bar),
MAX. at Ambient Temperature
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M"Media Specific Gravity
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PTFE
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+32°F to +212°F (0°C to 100°C)
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25 (1.7)
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.86
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PVDF
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-40°F to +250°F (-40°C to 121°C)
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50 (3.4)
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.86
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Note: A single float type is selected for use at all actuation points.
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Wiring Group:
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Group I Lead Wire (*)
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Group II Lead Wire (*)
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Group I Cable (*)
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Group II Cable (*)
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* Pin correlation of plug and connectors shown in parenthesis.
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A |
Minimum distance to highest actuation level. |
B |
Minimum distance between actuation levels. |
C |
Minimum distance between two actuation levels with one float (Note: One float for two levels can be used only when low level is N.C. dry and high level is N.O. dry). |
D |
Minimum distance from end of unit to lowest level. |
E |
5/16" Dia. REF (7.9 mm) |
L1, L2, L3 & L4 actuation level distances and Lo (overall unit length) are measured from inner surfaces of mounting plug or flange.
Lo (Length overall) = L + Dimension D ( Lo max 24 inches)
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Dimensions
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Float Material |
A |
B |
C |
D |
PTFE |
1-3/4"
44.5 mm* |
2"
50.8 mm |
1/8"
3.2 mm |
1-1/4"
31.8 mm |
PVDF |
1-3/4"
44.5 mm* |
2"
50.8 mm |
1/8"
3.2 mm |
1-1/8"
28.6 mm |
*Mounting Type 22 (1" NPT) requires a minimum "A" dim. of 1-3/4" (44.5mm)
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