SPECTEC Model 4051 Speed Switch signal conditioner provides adjustable output for controlling devices based on the input from flow or speed detection sensors. In a typical installation, a magnetic sensor mounted on a transmission provides an input frequency to the Speed Switch. The output from the Speed Switch will be ON when the input frequency is above the adjustable set point (to detect over-speed condition) and switches OFF when the frequency falls below the set point.
Two Models of Speed Switch Signal Conditioners
Two versions are available to meet low speed or high speed applications. The Speed Switch signal conditioner fits compactly into a ½ or ¾ NPT ELBY explosion-proof enclosure for mounting on a conduit or SPECTEC's conduit-mount Intrinsically Safe Model 41 explosion-proof magnetic speed sensor.
Speed Switch Characteristics:
| Set point Adjustment: | Model 4051-01: 10 to 230 Hz Model 4051-02: 75 to 1200 Hz |
| Response: | 50 to 100 mS typical |
| Style: | 1.47" dia. PVC puck |
| Temp range: | -40 to 85° deg F (-40 to 185° deg C) |
| Output: | Open Collector; two discrete states: ON and OFF |
| Vsupply: | 9 - 30 Vdc @ 4 mA Reverse polarity and high voltage protection to 100 Vac. Momentary output short circuit protection |
Speed - Flow Switch Signal Conditioner Applications:
Typical applications of the Model 4051 Speed Switch utilizes a variable reluctance magnetic sensor to detect the movement of gear teeth or similar metal parts and generate a repetitive waveform proportional to the speed of the gear's motion. A magnetic sensor connected directly to the speed switch provides decision-making capability for applications such as speed governors, safety controls and motion interlocks.
In conjunction with any active or passive speed sensor (Hall effect sensor, inductive or variable reluctance magnetic sensor, digital magnetic sensor, or digital RF pickup) the Speed Switch can be set to turn on or off auxiliary devices such as fans, valves, brakes, or audible alarms. The Speed Switch can be set to control the on/off positioning of mechanical or high current solid state relays.
The Speed Switch is used in the truck and industrial equipment situations for under speed alarms and over speed alarms or detection.
When used with a turbine flow meter, the speed switch acts as a Flow Switch to provide a contact closure at a set flow rate for opening or closing a valve or sounding an alarm.
Related Products:
See our ELBY explosion-proof enclosures and magnetic speed sensors.