Looking for ways to prevent equipment failures and save money? The Phares Model ZS12 Zero Speed Switch ensures precision and productivity in your operations. This rugged all-in-one shaft speed monitoring device is designed for outdoor use. It combines both sensor and relay, no separate control box required. Capable of switching up to 5 amps. Equip your system with the ZS12 Zero Speed for reliability and peace of mind.
Ready to order or need help choosing the right model?
Send an email to get a quote or ask a question.
| Part Number | Input Voltage | Contacts (5 Amp) | Target |
| ZS12-AF | 100-240 VAC | N.O./N.C. | Ferrous |
| ZS12-AM | 100-240 VAC | N.O./N.C. | Magnetic |
| ZS12-DF | 9-36 VDC | N.O./N.C. | Ferrous |
| ZS12-DM | 9-36 VDC | N.O./N.C. | Magnetic |
The Phares Model ZS12 Zero Speed Switch is a robust, all-in-one device designed to safeguard your industrial machinery. It features both relay and replaceable sensor, making it ideal for over-speed, under-speed, or zero-speed monitoring. This device protects your conveyors and other equipment from unexpected slowdowns or stops.
The ZS12 Zero Speed Switch offers precise and accurate speed measurement with its adjustable setpoint, controlled by a multi-turn trim pot. It can react in a fraction of a second if your conveyor or machine suddenly stops.
When your machine’s shaft speed hits the setpoint, the ZS12 Zero Speed Switch’s relay output changes its state. It remains in this state until the machine slows down too much or stops completely.
The Phares ZS12 Zero Speed Switch also comes with three diagnostic LEDs:
You can easily adjust the setpoint using the multi-turn trim pot for precise control.
The ZS12 Zero Speed Switch features isolated relay contacts, which makes it incredibly simple to integrate into both new and existing systems. It’s also an excellent choice for replacing older, obsolete zero-speed switches.
The ZS12 Zero Speed Switch is highly versatile and can be installed on a wide range of industrial equipment where shaft speed monitoring is crucial. This includes, but isn’t limited to:
It’s suitable for virtually any application requiring reliable shaft speed oversight.
| Operating Voltages | 100-240 VAC (for Model No. ZS12-A) 9-36 VDC (for Model No. ZS12-D) |
|---|---|
| Current Draw | 116 mA |
| Circuit Protection | Internal ½ amp fuse, non-replaceable |
| Operating Temperature | -40°F to 140°F |
| Speed Detection Range | 0.03 to 25,000 RPM |
| Threads | 1/2-inch NPT |
| Relay | Output: Life expectancy: Electrical 100,000 operations min. (at 1,800 operations/hr) |
| Relay Setpoint Adjustment Range | Standard: 1-100 RPM, 1 Pulse Per Revolution Custom parameters are available. |
| Extend the Sensor | The Sensor may be extended from the enclosure with 1/2-inch conduit. |
| Housing Material | Cast Aluminum |
| Sensing Distance to Target (Gap) | 1/16″ to 5/16″ using Ferrous Target (Gear Tooth Wheel, Bolt Head, Key Stock, etc.) Sold separately: 1/16″ to 3/8″ using Phares High Density Magnetic Disk 1″ maximum using Phares Standard Magnetic Disk 1″ maximum using Phares Magnet, Part No. SM-100 2″ maximum using Phares Magnet, Part No. RM-100 |
| Minimum Gear Tooth Target Sizes | 1/8″ gear tooth length, width, depth and gap. |
| Gear Tooth Target Material | Low carbon steel (high iron content) |
Installation is simple:
LED indicators show power, sensor, and relay status at a glance.
For ferrous targets, a minimum of 1/16″ to 5/16″ (1.6 to 7.9 mm).
Magnetic Targets sold separately:
1/2″ to 3/8″ using Phares Magnetic Disk
1″ maximum using Phares Magnet, Part No. SM-100
2″ maximum using Phares Magnet, Part No. RM-100
Sensor and relay combined in a single unit. Switches 5 Amps.
The ZS10 Module paired with your choice of a simple on/off sensor functions as a zero speed switch.
Process tachometer with programmable relays, LED display, and analog output signals