Level Sensors & Switches

LS-77700 Single-Point Level Switch

Part Number: 117712
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LS-77700 Series Single-Point Level Switches perform in liquids with specific gravities as low as 0.45; switches protrude into tank less than 3 inches (76 mm).

  • Bent Stem / Side Mount Design
  • Specific Gravity as low as .45
  • Stainless Steel or Brass
CE ROHS Gems Compliant CSA


  • Bent Stem / Side Mount Design
  • Specific Gravity as low as .45
  • Stainless Steel or Brass 
Sensor Type
Float Type
Primary Material Of Construction
Wetted Materials
316 Stainless Steel, PH-15-7-MO Stainless Steel
Stem Material
Stainless Steel
Float Material
316 Stainless Steel
Float Diameter
1 1/2"
Actuation Level
Min. Liquid SG
Maximum Pressure
100 psi
Minimum Temperature
Maximum Temperature
Mounting Size
1/8" NPT Male
Mounting Style
Electrical Termination
24" Long, 22 AWG, Polymeric Leads
Switch Type
SPST (20 VA)
Switch Operation
Normally Open (Non-Reversible)
UL Recognized, CE, ROHS

Reed Switch Protection

Format .pdf
Size 56 KB

Gems Sensors Instructions, Level Switches

Format .pdf
Size 553 KB

Gems Sensors Catalog, LS-77700

Format .pdf
Size 201 KB
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Is there a minimum current flow requirement for a standard 20VA reed switch?

Yes, very low currents (< 5ma) can prevent “cleaning” of the contacts or not have enough energy to maintain low contact resistance. 5ma is likely a good minimum for our standard 20 VA switch. But you also want enough voltage. Approximately, 5V, 5ma is a good minimum. For low current switching we recommend a 10 VA reed switch which can better handle lower loads. (1ma for example).

What is the life expectancy of a reed switch?

A reed switch is extremely rugged and designed to operate reliably for many years, under ideal conditions, up to about 2 million cycles. To achieve maximum service life, reed switches benefit from protected electrical supply.