microprocessor circuit monitors a three-phase supply
and detects whether the phases are rotating in the correct
sequence. This circuit is produced in several forms
for different companies, examples of which are given
Use these as a guide to some of the possibilities or
tell us of how you would like to use our circuit.
Mounted, powered directly from the monitored 3 phase
version is permanently mounted on to sealed motor/pump
assemblies used in the nuclear, chemical and petrochemical
industries. As the assemblies are sealed there is no
way of telling whether the shafts are rotating in the
correct direction. Operation of the pump in the wrong
direction can cause damage or hazard. It is important,
therefore, that, after installation or maintenance,
the connections can be seen to be correct at switch-on.
circuit is mounted into a slim turned-aluminium housing
with a clear dome on top. The circuit is fully encapsulated
in heat-conducting compound. A high-brightness 10mm
LED is visible through the dome. Indication of correct
phasing is a steady illumination of the LED, reversed
phases give a flashing output and missing phases result
in no illumination at all.
powered from a single phase 110-230V Supply
functions as a protection relay. It has a D.P.C.O. contact
output from an internal relay which is energised under
normal conditions. Under fault conditions i.e. missing
or reversed phases the relay drops out. This is a fail-safe
Held, powered directly from the 3 phase 230-440V supply
type of model is an invaluable addition to the tool-box
of Electrical/Maintenance Engineers. As the unit is
powered from the supply being tested there are no batteries
to run down at a critical moment.
circuit is mounted into a slim plastic housing with
three test leads and two indicator LEDs. Indication
of correct phasing is a steady illumination of the green
LED, reversed phases are indicated by a flashing red
LED and missing phases result in no illumination at
Digit LED Clock/ Process Efficiency Monitor
most visible part of this wall-mounted unit is the four
4" high, red, 7-segment displays. With the addition
of one of our microprocessor control boards this functions
as a Works clock driving external bells to indicate
start/finish and break times.
have also made a variation this unit to operate as an
efficiency monitor. In this variation the target time
for a repeated process is programmed in using push-switches
and the main display. There is some form of feedback
from the process or machine to indicate the completion
of a cycle.
unit displays, in turn, target time, actual time taken
and a continually updated efficiency read-out in percent.
Thus an operator or supevisor can see how a well a procedure
is going and take remedial action where problems occur.
is designed to interface with most common flow-sensors,
which we can supply on request, and gives a 4 digit
LED read-out in litres/minute or other scaling if required.
It can also be converted for use as a tachometer.
intermittent use we can supply a battery operated version,
but for extended or continuous use we can supply an
external power supply of the 'plug-top' type.
development is a version with an LCD read-out to lower
the power requirement. This will be user programmable
to accept any sensor and will be designated Universal
If you have any features that you would like to see
on this new unit e-mail us now.
Products for Commercial Vehicles
Electronics make a number of security alarm products
designed to interface with ultra-sonic detectors, key-switches,
magnetic reeds, standard door contacts and sounders.
All are microprocessor based, fully proven, low-power
standard programs can operate in manual or automatic
mode. We can also re-write the programs to suit your
particular needs or circumstances.
and Bench-mounted Low-voltage Power Supplies for Educational
have been designing and supplying products for Education
for over 20 years including computer interfaces, educational
software and electrocardiographs. The mainstay of this
section of the business has been power supplies. Our
designs are either tailored to particular schools' requirements,
in which case we make the full product. Or manufacturers
of benching provide their own design housing (usually
a type of trunking), into which we fit our custom designed
requirements are 5V at 2A, Variable dual-rail supplies
of up to 15V, 12V at 2A and 24V~ at 2A for soldering
irons. Our designs are specially rugged to withstand
also produce our own range of standard low voltage outlets
on double-socket blanking plates with 4mm sockets for
mounting in standard mains trunking. We produce plates
for 5V, 12V and 1.5-15V variable although other requirements
can be accommodated.
new addition to this range in 1998 was the computer-controlled
power supply system where up to 32 power supplies in
a class-room can have their individual voltage set and
continuously monitored by a low cost standard P.C. through
the RS232 port. Full software is provided with the system.
for the Drinks/Refrigeration Industry
Fluorescent Light Drivers for use with 24V supplies
Electronics produce a vast range of standard and bespoke
products for this and other industries.
your requirements to us and see how we can enhance your