|
Earth Wire Monitor
(contact JoJen supplies)
Rugged unit
to monitor earth wire integrity between point of connection and the transformer star point
on a 525V 3-phase system.
Can be made for other voltages and a range of sensitivities and trip delays
EWM model: Earth Wire Monitor for installation at load side (e.g.
motor)
ERM model: for installation on minisub to monitor the Neutral Earthing Resistor
ERCM model: to monitor the Neutral Earthing Resistor as well as the Earth Fault current
|
|
SVC
(contact
JoJen supplies)
Motor start-up Sequence and Vigilance Controller
intended for safety on winch motors, underground motors etc. |
|
|
Celtifier
for monitor &
control through SMS's and miss-calls using your cellphone.
Just needs your SIM card and off you go.
|
|
|
Wireless proximity detection
used
for collision avoidance in underground locos
working
on 433MHz
|
 ->
|
|
Agent for the above mining monitor
products:
JoJen Supplies - John: 083
230161
|
|
|
Digital Timer
with DIP switches
settable range: 0.25 –
63.75 seconds
in steps of 0.25 sec
(longer times can be arranged)
|
70 x 50 x 23mm
|
| USB-RS232-I2C-PIC
programmer Adaptor box |
|
|
low cost Fluid immersion sensor
|
|
Telephone recording interface
detects
on/off-hook,
digitises sound and transmits WAV
packets to PC via USB |
70 x 50 x 23mm
|
|
Spinning wheel with 20 lights
and controller
for probability based on programmed
probablilities.
Each number appears at random intervals but has a predefined
number of hits out of a specified number (300 in this example)
|
 <-
|
|
Podium display with response buttons
and
controller
Each display box has a thumbwheel number entry associated
with it,
after setting up a button is pressed to display the number
|
 |
|
EDMU: Energy Display and Management
Unit
For installation in homes to manage peak consumption
by warning, disconnecting and reconnecting load circuits
with internal and external data links
|
|
|
|
|
|
Affiliate Products
|
|
|
passive metal detector
Portable, lightweight and battery operated, fold-up model available.
Based on a sensor module (Mercutech) which monitors small changes in the earth's magnetic
field.
(See article on
microvolt amplilfier)
Contact Roteck
|
 ->
|
|
Dual beam for outside use
Developed, manufactured and sold by
MJR: contact Martin at 082 3902448
|
|
|
Legacy Designs
|
|
|
Automated PC controlled test station
with
- 2 serial communication links
- controlled 3-phase current oputput
- cotnrolled 3-phase voltages
- manual override
[2007]
|
|
Multifunction Earth
Fault Protection Relay
with SCADA Comm.s (Profibus)
[2002] |
|
Nurse call system
with mimic panel
for 80 bed units on serial bus,
full event records in non-volatile memory
[1997] |
|
Socket Tester
for testing the integrity and safety of South African power outlets
(being redesigned for ruggedness)
|
  |
|
DC earth leakage monitor
2mA resolution on 50mA range.
Using magnetic toroids,
based on core balance and BH nonlinearity
[1997]
|
|
Test
station
for Eskom's Remote Terminal
Units
in their Acquisition and Telecontrol system.
[1994] |
|
|
Field test unit, based on the 8751, C
and Assembler
for a missile launcher including optical, RF detectors and gyros
[1990]
|
|
Motor protection
Relay based on analog simulation of an accurate thermal model of an induction motor.
[1979] |
|
|
Passive earth fault protection
Relay
(20-2000mA-ac, 250-2500msec) for
high-voltage installations
(Erich's first patent)
[1978]
|
|
