Optical Liquid-Level Switches

	Switch Starting Position Switch Starting Position

1 Off (Normally Open)

1 On (Normally Closed)

	For Use With For Use With

	Pipe Size Pipe Size

1/4

3/8

	Thread Type Thread Type

NPT

BSPP

	Mounting Orientation Mounting Orientation

Horizontal

Vertical

	Insertion Depth Insertion Depth

1/4"

1 3/4"

	Overall Length Overall Length

2 3/16"

	Industry Designation Industry Designation

SPST-NO

SPST-NC

	Hex Size Hex Size

5/8"

1 1/16"

	Maximum Input Voltage Maximum Input Voltage

28V DC

40V DC

	Output Current Output Current

40 mA

200 mA

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	Maximum Pressure Maximum Pressure

145 psi @ 70° F

150 psi @ 70° F

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

4 Products

Noncontact Level Switches for Water

Detect water level with infrared light to avoid false switch activation caused by vibration in your tank. Also known as optical switches, these sense the level by reflecting light into a receiver that sends an output current to activate an alarm or control circuit. They are sensitive to light and should be shielded or used in enclosed tanks. Mount them horizontally or vertically.

SPST-NO switches activate when the tip is submerged in liquid and light stops reflecting into the receiver.

SPST-NC switches activate when the tip is exposed to air and light reflects into the receiver.

For technical drawings and 3-D models, click on a part number.

10V DC/28V DC Input Voltage
Pipe Size	Thread Type	Gender	Max. Pressure	Temp. Range, °F	Insertion Dp.	Switch Starting Position	Industry Designation	Output Current	Overall Lg.	Hex Size	Electrical Connection		Each
Polysulfone Plastic Body
1/4	NPT	Male	150 psi @ 70° F	0° to 175°	1/4"	1 Off (Normally Open)	SPST-NO	40 mA	2 3/16"	5/8"	Wire Leads	00000000	0000000
1/4	NPT	Male	150 psi @ 70° F	0° to 175°	1/4"	1 On (Normally Closed)	SPST-NC	40 mA	2 3/16"	5/8"	Wire Leads	00000000	000000

Infrared Noncontact Level Switches for Chemicals

Detect chemical level with infrared light to avoid false switch activation caused by vibration in your tank. Also known as optical switches, these sense the level by reflecting light into a receiver that sends an output current to activate an alarm or control circuit. They are sensitive to light and should be shielded or used in enclosed tanks. Mount them horizontally or vertically.

SPST-NO switches activate when the tip is submerged in liquid and light stops reflecting into the receiver.

SPST-NC switches activate when the tip is exposed to air and light reflects into the receiver.

For technical drawings and 3-D models, click on a part number.

10V DC/40V DC Input Voltage
Pipe Size	Thread Type	Gender	Max. Pressure	Temp. Range, °F	Insertion Dp.	Switch Starting Position	Industry Designation	Output Current	Overall Lg.	Hex Size	Electrical Connection		Each
Polysulfone Plastic Body
3/8	BSPP	Male	145 psi @ 70° F	0° to 175°	1 3/4"	1 Off (Normally Open)	SPST-NO	200 mA	3"	1 1/16"	Wire Leads	0000000	0000000
3/8	BSPP	Male	145 psi @ 70° F	0° to 175°	1 3/4"	1 On (Normally Closed)	SPST-NC	200 mA	3"	1 1/16"	Wire Leads	0000000	000000