Level Sensors & Switches

TH-800 Single-Point Level Switch

Part Number: 164468
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TH-800 Series Single-Point Level Switches incorporate level monitoring and a temperature switch in a single unit. A single-setting temperature sensor is in the bottom of the stem. TH-800 are ideal for use in oils and water and are intermediate in size.

  • Ideal in Oils and Water
  • Monitoring and Temperature Switch in a Single Unit
  • Intermediate Size


  • Ideal in Oils and Water
  • Level Monitoring and Temperature Switch in a Single Unit
  • Intermediate Size  
Sensor Type
Float Type
Primary Material Of Construction
Wetted Materials
Brass, Buna N, Berylium Copper
Stem Material
Float Material
Buna N
Float Diameter
1 1/4"
Actuation Level
1 1/2"
Min. Liquid SG
Maximum Pressure
150 psi
Minimum Temperature
Maximum Temperature
Mounting Size
1/4" NPT Male
Mounting Style
Electrical Termination
24" Long, 18 AWG, Polymeric Leads
Switch Type
SPST (20 VA)
Switch Operation
Normally Open (Reversible)

Reed Switch Protection

Format .pdf
Size 56 KB

Gems Sensors Instructions, Level Switches

Format .pdf
Size 553 KB

Gems Sensors Catalog, Specialty Switches

Format .pdf
Size 4 MB
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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.