Safety Switches

Micro processor based speed monitor manufactured by POWERTECH utilizes the Micro controller technology to improve reliability, accuracy and control. It receives input from proximity sensor. This instrument is used to indicate & control the speed of conveyors, crushers, rolling mills, agitators, mixers, stirrers  and other industrial machinery.

This specially developed electronic speed monitor  gives speed in rpm also the propotional retransmission output as 4-20 mA. 

We are a manufacturer and exporter of Zero speed switch also called as electronic speed switch/monitor/indicator. Nowadays in material handling plants under/over speed monitor is one of the essential control and safety device.

Application:

Electronic speed monitor is used to monitor speed of conveyors, crushers, rolling mills, agitators, mixers, stirrers, screw conveyors, and other industrial machinery. This device actuates relay contacts at preset speed. Using these contacts desired control action such as zero speed protection/ under speed protection/ over speed protection can be achieved.

Advantages:

• It senses speed by non-contact way. Hence no moving parts

• No wear and tears of rollers or misalignment of couplings

• Easy speed settings

• Built in initial by-pass time delay arrangement

• Speed setting possible from 1 rpm to 5000 rpm in optional ranges

• Totally enclosed sensor, works in presence of dust, dirt water, oil & chemicals

• Direction sensing and speed monitoring of various locations from single point is possible

• Intrinsically safe sensors and speed switches with flameproof enclosures are available for use in hazardous area

Chute Block Switch are manufactured and exported by us.

Tilt switch:

Application:

Tilt switch is an electronic device specially developed for sensing the level of an approaching stockpile on stacker-reclaimed or material in a hopper, in a silo and to provide an output signal which can be used to initiate control actions.

Advantages:

• The sensor probe of the unit has omni directional sensing pattern and hence on whichever side it tilts, it definitely provides an output signal
• Tilt switch has in built adjustable on and off delays to take care of the nuisance tripping due to wind flow or momentary jerks at the start and stop of the machine

Construction:

The tilt switch comprises of two parts, viz. Sensor probe and monitoring unit. The sensor probe is of tubular structure and is hanged by means of a chain link arrangement. When the tilt probe gets tilted by material the output relay gets actuated.

Pull Cord Switch are manufactured and exported by us across the globe.

Features:

• Universal (common) cast aluminum/ DMC enclosure
• Same overall and general mounting dimensions and hence reduction in variety of mounting brackets
• Rationalized design and construction allows inter changeability of parts
• Special rubber seal (0 ring) on shaft for better protection against ingress of dust, dirt etc.

Standard Specifications:

• Enclosure: Weatherproof, field mounding type, IP 65 cast AL/ cast iron, epoxy painted, color light gray
• DMC (FRP) enclosure for use in corrosive environment
• Special flame proof enclosure for use in hazardous area, group LLA, LLB, LLC
• Output contacts: 1NO + 1NO/ 2 NO  + 2 NC
• Contact rating for standard models : 16 amp resistive at 440 Vac
• Contact rating for models with reed switch contact: 30 VA, 24 Vdc/ 230 Vac, 1 amp (please specify your control voltage)
• Reset pull cord switch: manual reset type
• Belt sway switch: auto reset type

Optional accessories:

• Separate junction box for termination of cables  
• Indicating lamp: long life led indicating lamp for indication of operated pull cord switch 
• Mechanical flag indication for pull cord switch 
• Separate reset lever 
• Communication card (for trip indicator) 
• Hermetically sealed reed contacts for use in extreme dusty and corrosive conditions 

Pull cord switch series( PSW):

Application:

Pull cord switch also known as rope operated emergency switch is used as a safety switch to stop the conveyor belt in case of an emergency.

Construction:

Pull cord switch is housed in dust and weatherproof enclosure with ip65 grade of protection. Study and heavy-duty cam-switch with robust contacts is used to give longer service life. Operating handle fitted with spring steel rings at both ends for fixing the rope. The design of the rings gives maximum flexibility in operating condition. Enclosure is epoxy painted to give high corrosion resistance. The switch is designed with manual reset type of mechanism.

Operation:

Pull cord switch is mounted on the walkway side of the conveyor belt, preferably at about every 20 meters. When the rope is pulled from any side. The switch is operated . Unless and until the handle is reset to normal position manually, the switch remains in operated condition.

Pull cord wire and tying accessories :

Pull cord wire, Dia. Aprox. 5-6 mm, 6x7 construction, galvanized steel wire with PVC cover. Specially extruded for material handling industry. Tying clips, cable guide, eye bolt, tension spring, cable gland for tying pull cord cable to individual switch are also supplied at extra cost.

We offer a range of Belt Sway Switches.

Features:

• Universal (common) cast aluminum/DMC enclosure
• Same overall and general mounting dimensions and hence reduction in variety of mounting brackets
• Rationalized design and construction allows inter changeability of parts
• Special rubber seal (0 ring) on shaft for better protection against ingress of dust, dirt etc

Standard specifications:

• Enclosure: Weatherproof, field mounding type, ip65 cast AL/ cast iron, epoxy painted, color light gray
• DMC (FRP) enclosure for use in corrosive environment
• Special flame proof enclosure for use in hazardous area, group ll a, ll b, ll c
• Output contacts : 1NO + 1NO/ 2NO + 2 NC
• Contact rating for standard models : 16 amp resistive at 440 Vac
• Contact rating for models with reed switch contact : 30 VA, 24 Vdc/ 230 Vac, 1 amp. (please specify your control voltage)

Reset :

• Pull cord switch: manual reset type
• Belt sway switch: auto reset type

Optional accessories:

• Separate junction box for termination of cables
• Indicating lamp: long life led indicating lamp for indication of operated pull cord switch
• Mechanical flag indication for pull cord switch
• Separate reset lever
• Communication card (for trip indicator)
• Hermetically sealed reed contacts for use in extreme dusty and corrosive conditions

Belt Sway Switch Series(BSW):

Application:

The switch allows smooth running of the conveyor and protects it from damages by over swaying which can occur due to uneven loading of material, worn out idler roller bearings etc.

Construction:

The switch is housed in dust and weatherproof enclosure with ip65 grade of protection. The contact roller is supported on poly plastic bearing (delrin) having high relativity of lubrication s and the lowest coefficient of friction. This assures smooth operation of the roller over a long period of the time. Roller mechanism is of self reset type. The enclosure is epoxy painted to withstand harsh climate.

Operation:

For normal running of the belt with acceptable swaying, the belt-sway switch is generally mounted on both sides and near the edge of the conveyor belt. A is generally mounted on the both sides and near the edge of the conveyor belt. A small clearance is allowed between contact roller and the belt edge to allow the normal running of the belt with acceptable swaying. When swaying exceeds normal limit, the belt edge pushes the contact roller, which drives the switch and operates the contacts. The switch reset automatically when the belt resumes normal running.