- Vibration Monitoring
- PLC & I/O Cards
- Industrial Communications
- Automation Accessories
- Controllers & Data Acquisition
- AC Drives
- Isolator & Barrier
- Encoders
- Industrial Computers
- Safety Switches & Guard Locking
- Automation Software
- HMI Displays
- Motor Soft Starters
- CCTV & Security
- Servo Drives
- Robotics
- Pneumatic Cylinders
- Machine Vision
Brand: TopWorx
TopWorx GO Switch 70 Series Leverless Limit Switches
Description
Leverless magnetic limit switches for hydraulic and pneumatic cylinders
The TopWorx GO Switch 70 Series covers the 70 Series leverless limit switches, models 71 to 77 and 7L, with 7G, 7H and 7I variants. They operate on magnetic attraction: three permanent magnets and a push-pull plunger move a set of mechanical contacts when a ferrous metal or magnetic target enters the sensing range. The switches are unaffected by weld fields and RF interference, and the IOM includes a cylinder application detail showing how the switch is fitted.
Technical specifications
| Parameter | Specification |
|---|---|
| Manufacturer / series | TopWorx (Emerson) GO Switch 70 Series |
| Operating principle | Three permanent magnets and push-pull plunger operating mechanical contacts |
| Sensing distance, SPDT | Models 71 and 72: 0.040 in (1.02 mm) at 2,000 psi. Models 73-77 and 7L: 0.100 in (2.54 mm) at 2,000 psi; 0.072 in (1.83 mm) at 5,000 psi; 0.060 in (1.52 mm) at 10,000 psi |
| Sensing distance, DPDT | 0.090 in (2.3 mm) end sensing at 2,000 psi |
| Range with target magnet | Up to 0.35 in (models 71 and 72 up to 0.15 in) SPDT; up to 0.20 in (5 mm) DPDT |
| Differential | Approximately 0.020 in (0.5 mm) |
| Repeatability | 0.002 in (0.05 mm) typical under identical conditions |
| Response time | 8 milliseconds |
| Contacts | SPDT Form C; DPDT 2 Form C. Palladium silver with sawtooth surface |
| Resistive ratings, SPDT | Models 71-77: 4 A at 120 VAC, 3 A at 24 VDC, 2 A at 240 VAC, 1.25 A at 48 VDC; model 7L: 0.25 A at 120 VAC or 24 VDC (about 5 V drop) |
| Resistive ratings, DPDT | 3 A at 120 VAC; 1 A at 24 VDC |
| Temperature | Models 71-77: -40 to 221 F (-40 to 105 C); HiTemp option to 400 F (204 C) for 71-77, 7G and 7H; model 7L: -40 to 160 F (-40 to 71 C) |
| Thread options | 71, 72: 3/8-24 UNF or M12 x 1; 73-76 and 7L: 5/8-18 UNF or M18 x 1; 7G and 7H: 5/8-18 UNF or M18 x 1; 7I: 1-14 UNF |
| Enclosure | Stainless steel type 303, 316 optional; model 7L 316 stainless steel |
| Conduit outlet | 1/2 in NPT, one location |
| Target material | Ferrous metal (mild steel, 400 series and 17-4 stainless) or optional target magnets |
Mounting and application notes
The IOM advises avoiding contact between target and switch, mounting so that the bracket crosses the switch body near its middle and fitting the two supplied jam nuts, with lock washers where vibration is present. Maximum torque is 60 lb-in (7 N-m) on 3/8 in threads and 35 lb-ft (47 N-m) on 5/8 in threads. Nearby ferrous metal reduces sensing distance, and differential depends on the direction the target approaches. For heavy or inductive loads TopWorx recommends arc suppression or an interposing relay to protect contact life. Sensing distance falls as pressure rises, so use the figure for the working pressure of the cylinder.
What to confirm before ordering
Confirm the model letter and number, thread, contact form, temperature rating, the electrical load type and the target material. This IOM is a two-page document, so detailed wiring, dimensions and ordering codes come from the TopWorx GO Switch catalogue or configurator.
Documents and quotation
The TopWorx GO Switch 70 Series IOM (May 2015) is hosted on this page. Other valve position products are under Valve Positioners. Send the model, thread, pressure, load and quantity for a quotation.
Datasheets & Documents
- Manual TopWorx GO Switch 70 Series IOM (May 2015) Download
Reviews (0)
About brand
TopWorx is the valve controls and limit switch brand of Emerson, based in Louisville, Kentucky, USA. Its products mount on valve actuators to show whether a valve is open or closed, send switch or analog signals back to the control system and, in some models, operate the actuator pilot valve. Seven Star LLC, an independent supplier in Muscat, lists products from the manufacturer's manuals and datasheets and quotes against the exact model code.
TopWorx product groups
The documents on this site cover GO Switch leverless limit switches, the D-Series, TX-Series, TV-Series and K-Series discrete valve controllers, the DVR valve position monitor and the PD Series smart valve positioner. Options in these documents include GO Switch, mechanical and inductive sensors, 4-20 mA and HART transmitters, FOUNDATION Fieldbus, AS-i, DeviceNet and PROFIBUS communication, integrated pilots and explosion-protected enclosures.
Ordering TopWorx products: what we need
Send the full model code from the nameplate or the datasheet nomenclature, the actuator make, mounting pattern and size, the supply voltage and signal type, the hazardous-area certification and the quantity. Many options cannot be combined, so we confirm the code against the manufacturer's documentation before quoting.
Related products
Frequently Asked Questions
How does a GO Switch 70 Series switch work?
Magnets and a push-pull plunger operate mechanical contacts when a ferrous or magnetic target enters the sensing range.
What contact forms are available?
SPDT Form C and DPDT 2 Form C, with palladium silver contacts.
What are the SPDT resistive ratings?
Models 71-77 are rated 4 A at 120 VAC, 3 A at 24 VDC, 2 A at 240 VAC and 1.25 A at 48 VDC.
What pressure can the switches see?
Sensing distances are listed at 2,000, 5,000 and 10,000 psi for models 73-77.
What temperature range applies?
Models 71-77 are rated -40 to 221 F (-40 to 105 C), with a HiTemp option to 400 F (204 C).
Reviews
There are no reviews yet.