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The speed monitoring system comprises of a motion detector probe (MDP) with a Pre-amplifier (PA) and an evaluation unit (EU). When MDP is suitably installed to sense the moving target, the PA outputs pulses, the frequency of which is proportional to the speed of the moving target. These pulses are superimposed on the power supply feeding the PA and are transmitted to the EU. The EU after processing the pulses, compares their duration with stable internal time reference. This duration is sensed, amplified and made to operate a relay whose contacts in turn can be used for annunciation / control.

This has a specially designed probe suitable for temperatures up to 120°C (standard probe) and up to 200 °C (special probe), with a large sensing range of 100mm working on the reluctance principle. It has SS casing with an aluminium mounting flange and a tri-clamp arrangement for easy adjustment of target distance. An electronic insert is housed in the cast aluminium probe head provided with a suitable cable gland. An electromagnetic shield covers the rear of the probe to minimize interference from stray electromagnetic fields.


Easy to install and simple to calibrate

Normal, Alarm and Power Failure, indicated by LED’s

Flashing LED in the evaluation unit confirms receipt of pulses

Accurate pulse interval evaluation by comparison with a stable internal time base

Rugged motion detector probe especially designed for heavy industrial application

Over-speed / Under-speed alarm, field selectable, with fail-safe relay operation

Built-in adjustable start up delay with interlocking provision allows the monitored device to accelerate before the speed is evaluated

Mechanical Specifications

Electrical Specifications



Cast Aluminium, Weatherproof, Stoving enamel painted, suitable for back / wall mounting

Cable Entries

3 Nos. of ½” BSP / NPT

Operating Temperature

20°C to 60°C



Plastic with built-in terminals.

Operating Temperature

20°C to 80°CC


Probe Head

Cast Aluminium weather-proof


Cast Aluminium Flange

Target Range Adjustment

By tri-clamp mechanism

Maximum Detection range

100 mm

Target Material


Minimum Target Area

20 x 20 cm

Temperature Range

120°C (Standard)



110 / 230 V AC (-10 to +10%) 50Hz (as specified in the order)

Start-Up Time Delay

0 to 60 Second Adjustable by means of a potentiometer

Power Consumption

5 VA approx

Measuring Range

2 to 3000 Pulses / Min. (PPM)

Power to Pre-amplifier

12V DC at 50 m A max

Overall Dimensions

180 x 180 x 85 mm

Alarm Mode

Overspeed / Underspeed field selectable

Set Point Adjustment

Coarse setting by jumpers, fine setting by potentiometer


By potential free NO contact of contactor controlling the Motor of the monitored equipment

Relay Output

One set of potential free change over contacts rated at 6A, 230V AC 50Hz for non-inductive load.



12 V DC at 50 mA max. derived from Evaluation Unit


Current pulses

Applications Specifications

Detects speed of conveyors and Bucket Elevators and signals an alarm if the speed falls below the set speed. Special sensor detects moving ferrous objects from 100 mm distance. It can also be used as a missing bucket detector. High temperature models upto 200°C are available.

Switching Indication

Red / Green LED’s for Alarm and Normal conditions respectively