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
Housing
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
Housing
Plastic with built-in terminals.
Operating Temperature
20°C to 80°CC
Probe Head
Cast Aluminium weather-proof
Mounting
Cast Aluminium Flange
Target Range Adjustment
By tri-clamp mechanism
Maximum Detection range
100 mm
Target Material
Ferromagnetic
Minimum Target Area
20 x 20 cm
Temperature Range
120°C (Standard)
Mains
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
Interlock
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.
Supply
12 V DC at 50 mA max. derived from Evaluation Unit
Output
Current pulses
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.
Red / Green LED’s for Alarm and Normal conditions respectively