SAPCON SPEED-O-TESTER is a versatile
speed limit switch suitable for detecting an
over speed or under speed condition of rotating,
reciprocating or conveying equipment. It can
also detect a missing object amongst a series of
continuously moving objects at a constant speed,
such as a missing bucket in a bucket elevator.
Salient Features
Easy to install and simple to calibrate.
Accurate pulse interval evaluation by comparison
with a stable internal time base.
Overspeed/ Underspeed 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.
Flashing LED in the pre-amplifier indicates the
moving target is within the sensing range and
facilitates target to detector distance setting.
Flashing LED in the evaluation unit confirms
receipt of pulses.
Normal, Alarm and Power Failure, indicated by
LED's.
Rugged motion detector probe especially designed
for heavy industrial application.
Application
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.
System Description
The
speed monitoring system
comprises of a motion detector
probe (MDP) with 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 upto 120°C
standard (200 °C special), with
a large sensing range of 100 mm
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.
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Speed-O-Tester
(SSI...Series)
Easy to install and simple to calibrate. 
