Ideal Vacuum Medium Super-Seal Conflat CF 4.50 in. UHV Pneumatic Bellows Right Angle Valve, Through Hole Rotatable Flanges, Copper Bonnet Seal. These medium Ideal Vacuum Super-Seal pneumatic bellows 90° angle valves have CF 4.50" (4-1/2") inlet and outlet ports with through hole rotatable flanges. They are designed primarily for use in the ultra high-vacuum range (10-10 Torr), with leak rates of 10-11 Torr l/s (He) but can be used up to positive pressures of 60-80 psi. These valves are constructed of a 304L stainless steel valve body and mechanism, an aluminum actuator, and have copper bonnet seals. Super-Seal valves are bakeable up to 100°C (valve body only). These valves can be mounted in any orientation. These medium-sized Super-Seal valves require air to both open and to close. They do not have a spring return and therefore do not automatically close. Low volume, dry, compressed air in the range of 60-to-80 psi is needed. Because they do not have automatic spring closure, they cannot provide failure protection to preserve chamber vacuum in case of loss of power or air supply. Air flow to both open and close the valve is controlled by a (medium) double-acting, electrically operated solenoid. A selection of four solenoid voltage choices is offered: 12 VDC, 24 VDC, 110 VAC, and 220 VAC. Three position indicator sensors are available for Super-Seal valves, including a mechanical reed switch and two transistor types (NPN and PNP). Each sensor has a LED which provides visual confirmation of the valve’s state (whether it is open or closed). These sensors can also be used to switch or trigger auxiliary devices. The Super-Seal family of valves includes weldable tube, KF, ISO-K, and Conflat (CF) flange options, from 3/4" OD tube (KF-16), to 10" OD tube (ISO-K 250), and many are available in right angle (90°) and in-line versions. These valves are a great value and are extremely reliable, making them useful for applications such as semiconductor manufacturing, plasma physics research, and nuclear accelerators. They are a primary component in vacuum process automation and have a mean time to failure rate (MTTF) of more than one million cycles. Solenoids and position indicator sensors are sold separately. Please see below for technical specifications and download the User Manual for complete information about the Ideal Vacuum Super-Seal family of pneumatic bellows valves and accessories.

Ideal Vacuum Medium Super-Seal Conflat CF 4.50 in. UHV Pneumatic Bellows In-line Valve, Through Hole Rotatable Flanges, Copper Bonnet Seal. These medium Ideal Vacuum Super-Seal pneumatic bellows in-line valves have CF 4.50" (4-1/2") inlet and outlet ports with through hole rotatable flanges. They are designed primarily for use in the ultra high-vacuum range (10-10 Torr), with leak rates of 10-11 Torr l/s (He) but can be used up to positive pressures of 60-80 psi. These valves are constructed of a 304L stainless steel valve body and mechanism, an aluminum actuator, and have copper bonnet seals. Super-Seal valves are bakeable up to 100°C (valve body only). These valves can be mounted in any orientation. These medium-sized Super-Seal valves require air to both open and to close. They do not have a spring return and therefore do not automatically close. Low volume, dry, compressed air in the range of 60-to-80 psi is needed. Because they do not have automatic spring closure, they cannot provide failure protection to preserve chamber vacuum in case of loss of power or air supply. Air flow to both open and close the valve is controlled by a (medium) double-acting, electrically operated solenoid. A selection of four solenoid voltage choices is offered: 12 VDC, 24 VDC, 110 VAC, and 220 VAC. Three position indicator sensors are available for Super-Seal valves, including a mechanical reed switch and two transistor types (NPN and PNP). Each sensor has a LED which provides visual confirmation of the valve’s state (whether it is open or closed). These sensors can also be used to switch or trigger auxiliary devices. The Super-Seal family of valves includes weldable tube, KF, ISO-K, and Conflat (CF) flange options, from 3/4" OD tube (KF-16), to 10" OD tube (ISO-K 250), and many are available in right angle (90°) and in-line versions. These valves are a great value and are extremely reliable, making them useful for applications such as semiconductor manufacturing, plasma physics research, and nuclear accelerators. They are a primary component in vacuum process automation and have a mean time to failure rate (MTTF) of more than one million cycles. Solenoids and position indicator sensors are sold separately. Please see below for technical specifications and download the User Manual for complete information about the Ideal Vacuum Super-Seal family of pneumatic bellows valves and accessories.

Ideal Vacuum Medium Super-Seal Conflat CF 4.625 in. UHV Pneumatic Bellows Right Angle Valve, Through Hole Rotatable Flanges, Copper Bonnet Seal. These medium Ideal Vacuum Super-Seal pneumatic bellows 90° angle valves have CF 4-5/8" inlet and outlet ports with through hole rotatable flanges. They are designed primarily for use in the ultra high-vacuum range (10-10 Torr), with leak rates of 10-11 Torr l/s (He) but can be used up to positive pressures of 60-80 psi. These valves are constructed of a 304L stainless steel valve body and mechanism, an aluminum actuator, and have copper bonnet seals. Super-Seal valves are bakeable up to 100°C (valve body only). These valves can be mounted in any orientation. These medium-sized Super-Seal valves require air to both open and to close. They do not have a spring return and therefore do not automatically close. Low volume, dry, compressed air in the range of 60-to-80 psi is needed. Because they do not have automatic spring closure, they cannot provide failure protection to preserve chamber vacuum in case of loss of power or air supply. Air flow to both open and close the valve is controlled by a (medium) double-acting, electrically operated solenoid. A selection of four solenoid voltage choices is offered: 12 VDC, 24 VDC, 110 VAC, and 220 VAC. Three position indicator sensors are available for Super-Seal valves, including a mechanical reed switch and two transistor types (NPN and PNP). Each sensor has a LED which provides visual confirmation of the valve’s state (whether it is open or closed). These sensors can also be used to switch or trigger auxiliary devices. The Super-Seal family of valves includes weldable tube, KF, ISO-K, and Conflat (CF) flange options, from 3/4" OD tube (KF-16), to 10" OD tube (ISO-K 250), and many are available in right angle (90°) and in-line versions. These valves are a great value and are extremely reliable, making them useful for applications such as semiconductor manufacturing, plasma physics research, and nuclear accelerators. They are a primary component in vacuum process automation and have a mean time to failure rate (MTTF) of more than one million cycles. Solenoids and position indicator sensors are sold separately. Please see below for technical specifications and download the User Manual for complete information about the Ideal Vacuum Super-Seal family of pneumatic bellows valves and accessories.

Ideal Vacuum Medium Super-Seal Conflat CF 6.0 in. UHV Pneumatic Bellows Right Angle Valve, Through Hole Rotatable Flanges, Copper Bonnet Seal. These medium Ideal Vacuum Super-Seal pneumatic bellows 90° angle valves have CF 6.0" inlet and outlet ports with through hole rotatable flanges. They are designed primarily for use in the ultra high-vacuum range (10-10 Torr), with leak rates of 10-11 Torr l/s (He) but can be used up to positive pressures of 60-80 psi. These valves are constructed of a 304L stainless steel valve body and mechanism, an aluminum actuator, and have copper bonnet seals. Super-Seal valves are bakeable up to 100°C (valve body only). These valves can be mounted in any orientation. These medium-sized Super-Seal valves require air to both open and to close. They do not have a spring return and therefore do not automatically close. Low volume, dry, compressed air in the range of 60-to-80 psi is needed. Because they do not have automatic spring closure, they cannot provide failure protection to preserve chamber vacuum in case of loss of power or air supply. Air flow to both open and close the valve is controlled by a (medium) double-acting, electrically operated solenoid. A selection of four solenoid voltage choices is offered: 12 VDC, 24 VDC, 110 VAC, and 220 VAC. Three position indicator sensors are available for Super-Seal valves, including a mechanical reed switch and two transistor types (NPN and PNP). Each sensor has a LED which provides visual confirmation of the valve’s state (whether it is open or closed). These sensors can also be used to switch or trigger auxiliary devices. The Super-Seal family of valves includes weldable tube, KF, ISO-K, and Conflat (CF) flange options, from 3/4" OD tube (KF-16), to 10" OD tube (ISO-K 250), and many are available in right angle (90°) and in-line versions. These valves are a great value and are extremely reliable, making them useful for applications such as semiconductor manufacturing, plasma physics research, and nuclear accelerators. They are a primary component in vacuum process automation and have a mean time to failure rate (MTTF) of more than one million cycles. Solenoids and position indicator sensors are sold separately. Please see below for technical specifications and download the User Manual for complete information about the Ideal Vacuum Super-Seal family of pneumatic bellows valves and accessories.

Double-Acting 12 VDC Solenoid Kit for Medium Super-Seal Pneumatic Bellows Valves, CF 4.50" to CF 6.0", ISO-K 63 to ISO-K 100, Weldable Tube 2.5 to 4.0 in. OD. This is a 12 VDC double-acting solenoid kit used on all medium Ideal Vacuum Super-Seal pneumatic bellows valves including 90 degree angle and inline valves. The kit includes a 1/8" to 1/4" brass NPT elbow and a 1/8" NPT male-to-female short brass extension needed to attach the solenoid (1/4" NPT) to the 1/8" female NPT air inlet of any medium sized Super-Seal valve. Also included are two straight and one elbow push-to-connect fittings with 1/8" NPT to 1/4" OD tubing for the airline connections, and two 1/8" NPT sintered brass exhaust mufflers. This solenoid requires a 12 VDC power source capable of supplying a current of 425mA. This double-acting solenoid kit is used on these medium Super-Seal pneumatic bellows valves: CF 4.50", CF 4.625", and CF 6.0" ISO-K 63, ISO-K 80, and ISO-K 100 Weldable Tube 2.5", 3.0", and 4.0" OD tube Medium-sized Super-Seal valves require air to both open and to close. They do not have a spring return and therefore do not automatically close. Low volume, dry, compressed air in the range of 60-to-80 psi is needed. When energized, the solenoid directs air flow through the solenoid’s manifold into the valve’s bonnet, opening the valve. When the solenoid is de-energized, air flow is redirected to the top of the valve head, closing the valve. Because they do not have automatic spring closure, medium Super-Seal valves cannot provide failure protection to preserve chamber vacuum in case of loss of power or air supply. The Super-Seal family of valves includes weldable tube, KF, ISO-K, and Conflat (CF) flange options, from 3/4" OD tube (KF-16), to 10" OD tube (ISO-K 250), and many are available in right angle (90°) and in-line versions. Available Super-Seal valve accessories sold separately include: 12 VDC, 24 VDC, 110 VAC, and 220 VAC Solenoids Mechanical reed switch, NPN, and PNP position indicator sensors, used to provide confirmation of the valve’s state (whether it is open or closed) and to switch or trigger auxiliary devices. Super-Seal valves are a great value and are extremely reliable, making them useful for applications such as semiconductor manufacturing, plasma physics research, and nuclear accelerators. They are a primary component in vacuum process automation and have a mean time to failure rate (MTTF) of more than one million cycles. Please see the supplied images for solenoid plumbing and view the brochure for basic solenoid wiring. Download the User Manual for step-by-step instructions for solenoid wiring and for complete information about the Ideal Vacuum Super-Seal family of pneumatic bellows valves.

Double-Acting 24 VDC Solenoid Kit for Medium Super-Seal Pneumatic Bellows Valves, CF 4.50" to CF 6.0", ISO-K 63 to ISO-K 100, Weldable Tube 2.5 to 4.0 in. OD. This is a 24 VDC double-acting solenoid kit used on all medium Ideal Vacuum Super-Seal pneumatic bellows valves including 90 degree angle and inline valves. The kit includes a 1/8" to 1/4" brass NPT elbow and a 1/8" NPT male-to-female short brass extension needed to attach the solenoid (1/4" NPT) to the 1/8" female NPT air inlet of any medium sized Super-Seal valve. Also included are two straight and one elbow push-to-connect fittings with 1/8" NPT to 1/4" OD tubing for the airline connections, and two 1/8" NPT sintered brass exhaust mufflers. This solenoid requires a 24 VDC power source capable of supplying a current of 200mA. This double-acting solenoid kit is used on these medium Super-Seal pneumatic bellows valves: CF 4.50", CF 4.625", and CF 6.0" ISO-K 63, ISO-K 80, and ISO-K 100 Weldable Tube 2.5", 3.0", and 4.0" OD tube Medium-sized Super-Seal valves require air to both open and to close. They do not have a spring return and therefore do not automatically close. Low volume, dry, compressed air in the range of 60-to-80 psi is needed. When energized, the solenoid directs air flow through the solenoid’s manifold into the valve’s bonnet, opening the valve. When the solenoid is de-energized, air flow is redirected to the top of the valve head, closing the valve. Because they do not have automatic spring closure, medium Super-Seal valves cannot provide failure protection to preserve chamber vacuum in case of loss of power or air supply. The Super-Seal family of valves includes weldable tube, KF, ISO-K, and Conflat (CF) flange options, from 3/4" OD tube (KF-16), to 10" OD tube (ISO-K 250), and many are available in right angle (90°) and in-line versions. Available Super-Seal valve accessories sold separately include: 12 VDC, 24 VDC, 110 VAC, and 220 VAC Solenoids Mechanical reed switch, NPN, and PNP position indicator sensors, used to provide confirmation of the valve’s state (whether it is open or closed) and to switch or trigger auxiliary devices. Super-Seal valves are a great value and are extremely reliable, making them useful for applications such as semiconductor manufacturing, plasma physics research, and nuclear accelerators. They are a primary component in vacuum process automation and have a mean time to failure rate (MTTF) of more than one million cycles. Please see the supplied images for solenoid plumbing and view the brochure for basic solenoid wiring. Download the User Manual for step-by-step instructions for solenoid wiring and for complete information about the Ideal Vacuum Super-Seal family of pneumatic bellows valves.

Double-Acting 110 VAC Solenoid Kit for Medium Super-Seal Pneumatic Bellows Valves, CF 4.50" to CF 6.0", ISO-K 63 to ISO-K 100, Weldable Tube 2.5 to 4.0 in. OD. This is a 110 VAC double-acting solenoid kit used on all medium Ideal Vacuum Super-Seal pneumatic bellows valves including 90 degree angle and inline valves. The kit includes a 1/8" to 1/4" brass NPT elbow and a 1/8" NPT male-to-female short brass extension needed to attach the solenoid (1/4" NPT) to the 1/8" female NPT air inlet of any medium sized Super-Seal valve. Also included are two straight and one elbow push-to-connect fittings with 1/8" NPT to 1/4" OD tubing for the airline connections, and two 1/8" NPT sintered brass exhaust mufflers. This solenoid requires a 110 VAC power source capable of supplying a current of 70mA. This double-acting solenoid kit is used on these medium Super-Seal pneumatic bellows valves: CF 4.50", CF 4.625", and CF 6.0" ISO-K 63, ISO-K 80, and ISO-K 100 Weldable Tube 2.5", 3.0", and 4.0" OD tube Medium-sized Super-Seal valves require air to both open and to close. They do not have a spring return and therefore do not automatically close. Low volume, dry, compressed air in the range of 60-to-80 psi is needed. When energized, the solenoid directs air flow through the solenoid’s manifold into the valve’s bonnet, opening the valve. When the solenoid is de-energized, air flow is redirected to the top of the valve head, closing the valve. Because they do not have automatic spring closure, medium Super-Seal valves cannot provide failure protection to preserve chamber vacuum in case of loss of power or air supply. The Super-Seal family of valves includes weldable tube, KF, ISO-K, and Conflat (CF) flange options, from 3/4" OD tube (KF-16), to 10" OD tube (ISO-K 250), and many are available in right angle (90°) and in-line versions. Available Super-Seal valve accessories sold separately include: 12 VDC, 24 VDC, 110 VAC, and 220 VAC Solenoids Mechanical reed switch, NPN, and PNP position indicator sensors, used to provide confirmation of the valve’s state (whether it is open or closed) and to switch or trigger auxiliary devices. Super-Seal valves are a great value and are extremely reliable, making them useful for applications such as semiconductor manufacturing, plasma physics research, and nuclear accelerators. They are a primary component in vacuum process automation and have a mean time to failure rate (MTTF) of more than one million cycles. Please see the supplied images for solenoid plumbing and view the brochure for basic solenoid wiring. Download the User Manual for step-by-step instructions for solenoid wiring and for complete information about the Ideal Vacuum Super-Seal family of pneumatic bellows valves.

Double-Acting 220 VAC Solenoid Kit for Medium Super-Seal Pneumatic Bellows Valves, CF 4.50" to CF 6.0", ISO-K 63 to ISO-K 100, Weldable Tube 2.5 to 4.0 in. OD. This is a 220 VAC double-acting solenoid kit used on all medium Ideal Vacuum Super-Seal pneumatic bellows valves including 90 degree angle and inline valves. The kit includes a 1/8" to 1/4" brass NPT elbow and a 1/8" NPT male-to-female short brass extension needed to attach the solenoid (1/4" NPT) to the 1/8" female NPT air inlet of any medium sized Super-Seal valve. Also included are two straight and one elbow push-to-connect fittings with 1/8" NPT to 1/4" OD tubing for the airline connections, and two 1/8" NPT sintered brass exhaust mufflers. This solenoid requires a 220 VAC power source capable of supplying a current of 35mA. This double-acting solenoid kit is used on these medium Super-Seal pneumatic bellows valves: CF 4.50", CF 4.625", and CF 6.0" ISO-K 63, ISO-K 80, and ISO-K 100 Weldable Tube 2.5", 3.0", and 4.0" OD tube Medium-sized Super-Seal valves require air to both open and to close. They do not have a spring return and therefore do not automatically close. Low volume, dry, compressed air in the range of 60-to-80 psi is needed. When energized, the solenoid directs air flow through the solenoid’s manifold into the valve’s bonnet, opening the valve. When the solenoid is de-energized, air flow is redirected to the top of the valve head, closing the valve. Because they do not have automatic spring closure, medium Super-Seal valves cannot provide failure protection to preserve chamber vacuum in case of loss of power or air supply. The Super-Seal family of valves includes weldable tube, KF, ISO-K, and Conflat (CF) flange options, from 3/4" OD tube (KF-16), to 10" OD tube (ISO-K 250), and many are available in right angle (90°) and in-line versions. Available Super-Seal valve accessories sold separately include: 12 VDC, 24 VDC, 110 VAC, and 220 VAC Solenoids Mechanical reed switch, NPN, and PNP position indicator sensors, used to provide confirmation of the valve’s state (whether it is open or closed) and to switch or trigger auxiliary devices. Super-Seal valves are a great value and are extremely reliable, making them useful for applications such as semiconductor manufacturing, plasma physics research, and nuclear accelerators. They are a primary component in vacuum process automation and have a mean time to failure rate (MTTF) of more than one million cycles. Please see the supplied images for solenoid plumbing and view the brochure for basic solenoid wiring. Download the User Manual for step-by-step instructions for solenoid wiring and for complete information about the Ideal Vacuum Super-Seal family of pneumatic bellows valves.

Reed-Type Position Sensor with RED LED Indicator for All Ideal Vacuum Super-Seal Pneumatic Bellows Valves, 5-120 VAC or VDC, 100 mA. The mechanical Reed-type position indicator sensor detects and is activated when the magnetic field generated by the top of the Super-Seal valve actuator aligns with the sensor. A red LED illuminates when the sensor is triggered. In addition to providing visual confirmation of the valve’s state (whether it is open or closed), the Reed sensor can also be used to switch or trigger an auxiliary device. Super-Seal valves have two position indicator sensor slots in their valve heads, one long, one short. This sensor is activated and illuminates when: the valve is open and the sensor is in the short slot. the valve is open and the sensor is positioned at the top of the long slot. the valve is closed and the sensor is positioned at the bottom of the long slot. To correctly adjust the sensor, slide it into one of the sensor slots (set screw facing out). Energize the solenoid to open the valve. Slide the sensor up and down in the slot until the LED illuminates. With a small flat head jeweler’s screwdriver, tighten the sensor set screw to secure it in place. The reed sensor has two conductors, brown (+), and blue (-). It is powered by an external power supply of 5 - 120 volts, AC or DC, and has a 100mA maximum current draw (maximum contact rating is 10W). The Reed-type sensor is recommended to trigger a digital device, such as a PLC, since it has limited current capability. The Reed-type sensor requires a series resistor on the positive conductor to limit the current through the red LED (maximum 20mA). As voltage increases, so does the value and power rating of the resistor needed. The LED can be driven with reduced current (2mA minimum), which decreases the resistor’s wattage rating, albeit at reduced brightness. For example, at 120 VAC a 2.7kO, 2W resistor is needed for maximum brightness. A 1/4W, 56kO resistor may be substituted, but the LED would pull only 2mA and brightness would be diminished significantly. The basic calculation for the correct resistor value (at 20mA) for a DC voltage source is: R = 50 (E-2) and for an AC voltage source (to obtain similar brightness) is: R = 25 (E-2.7) where R is the resistor value needed, and E is the operating voltage. Please see the brochure for sensor technical specifications, wiring, and suggested resistor values at some common voltages. Download the User Manual for information about wiring multiple position indicator sensors, and for complete information about the Ideal Vacuum Super-Seal family of pneumatic bellows valves and available options.

NPN-Type Position Sensor with Red LED Indicator for All Ideal Vacuum Super-Seal Pneumatic Bellows Valves, 5-30 VDC, 200mA. The NPN-type transistor position indicator sensor detects and is activated when the magnetic field generated by the top of the Super-Seal valve actuator aligns with the sensor. A red LED illuminates when the sensor is triggered (the PNP-type sensor has a green LED). In addition to providing visual confirmation of the valve’s state (whether it is open or closed), the NPN sensor can also be used to switch or trigger an auxiliary device. Super-Seal valves have two position indicator sensor slots in their valve heads, one long, one short. This sensor is activated and illuminates when: the valve is open and the sensor is in the short slot. the valve is open and the sensor is positioned at the top of the long slot. the valve is closed and the sensor is positioned at the bottom of the long slot. To correctly adjust the sensor, slide it into one of the sensor slots (set screw facing out). Energize the solenoid to open the valve. Slide the sensor up and down in the slot until the LED illuminates. With a small flat head jeweler’s screwdriver, tighten the sensor set screw to secure it in place. This NPN-type semiconductor sensor has three conductors. It is powered by an external power supply of 5 - 30 VDC and requires a series resistor connected between DC positive and the collector to limit the current through the red LED (maximum 20mA). The load on this semiconductor sensor need not be a resistor. It can be any load, such as a fan or a relay, as long as the load is rated for the same voltage as that supplied to the sensor, and the load’s current draw is less than 200mA, the maximum allowable. For example, if the sensor is supplied with 12 VDC, a 12 VDC rated fan can be substituted for a resistor, as long as the fan’s inrush current does not exceed 200mA. A protection diode is needed for inductive loads. These semiconductor sensors are recommended to switch or trigger auxiliary devices through relays, since most small relays have coils which require less than 200mA. There is little perceived reduction of LED intensity when using a non-resistor load. If using a resistor, the basic calculation for the correct value which yields maximum LED brightness is: R = 50 (E-2) where R is the resistor value needed, and E is the operating voltage. Please see the brochure for sensor technical specifications, wiring, and suggested resistor values at some common voltages. Download the User Manual for information about wiring multiple position indicator sensors, and for complete information about the Ideal Vacuum Super-Seal family of pneumatic bellows valves and available options.

PNP-Type Position Sensor with GREEN LED Indicator for All Ideal Vacuum Super-Seal Pneumatic Bellows Valves, 5-30 VDC, 200mA. The PNP-type transistor position indicator sensor detects and is activated when the magnetic field generated by the top of the Super-Seal valve actuator aligns with the sensor. A green LED illuminates when the sensor is triggered (the NPN-type sensor has a red LED). In addition to providing visual confirmation of the valve’s state (whether it is open or closed), the PNP sensor can also be used to switch or trigger an auxiliary device. Super-Seal valves have two position indicator sensor slots in their valve heads, one long, one short. This sensor is activated and illuminates when: the valve is open and the sensor is in the short slot. the valve is open and the sensor is positioned at the top of the long slot. the valve is closed and the sensor is positioned at the bottom of the long slot. To correctly adjust the sensor, slide it into one of the sensor slots (set screw facing out). Energize the solenoid to open the valve. Slide the sensor up and down in the slot until the LED illuminates. With a small flat head jeweler’s screwdriver, tighten the sensor set screw to secure it in place. The PNP semiconductor sensor has three conductors. It is powered by an external power supply of 5 - 30 VDC and requires a series resistor connected between DC negative and the emitter conductor to limit the current through the green LED (maximum 20mA). The load on this semiconductor sensor need not be a resistor. It can be any load, such as a fan or a relay, as long as the load is rated for the same voltage as that supplied to the sensor, and the load’s current draw is less than 200mA, the maximum allowable. For example, if the sensor is supplied with 12 VDC, a 12 VDC rated fan can be substituted for a resistor, as long as the fan’s inrush current does not exceed 200mA. A protection diode is needed for inductive loads. These semiconductor sensors are recommended to switch or trigger auxiliary devices through relays, since most small relays have coils which require less than 200mA. There is little perceived reduction of LED intensity when using a non-resistor load. If using a resistor, the basic calculation for the correct value which yields maximum LED brightness is: R = 50 (E-2) where R is the resistor value needed, and E is the operating voltage. Please see the brochure for sensor technical specifications, wiring, and suggested resistor values at some common voltages. Download the User Manual for information about wiring multiple position indicator sensors, and for complete information about the Ideal Vacuum Super-Seal family of pneumatic bellows valves and available options.