Some Products developed by Mercutech

ECM
Earth and Cable Monitor
(sales contact: JoJen supplies)

For electrical safety as well as loss control: detecting damage to Earth or Neutral conductors.
This unit monitors the resistance of a wire in a circuit, e.g. an earth wire or the Neutral.
Resistance range: 0 – 5 Ohms.

A split-core toroid is clamped around a conductor (eg. an earth wire) for monitoring the resistance of the circuit in which the wire is running.
A change in this measurement will trigger an alert.
A 50Hz current can also be detected to trigger an output, indicating an earth fault current or overcurrent.
It has two inputs for connecting contacts, eg. door switches or IR detectors.
An external rechargeable battery can be connected to provide some hours of operation during a power failure.
Connects to 110 - 220V single phase AC supply

The output is a N/O or N/C relay contact and it can send SMS's or misscalls

Earth Wire Monitor
(sales contact: JoJen supplies)

Earth Wire Monitor for installation at load side (e.g. motor) where there is no Neutral

Monitors the resistance of the earth wire as measured between the Earth wire and the transformer star point.
Resistance range: 150 – 500 Ohms.

Rugged and all-solid state.Suitable for 380 - 525V systems.
Trip point (Ohms) as requested in the above range.
Typical trip delay is 5 sec.s, can be made for other voltages and trip delays.

TransformerProtection
(TWR = Transformer Watchdog Relay)
(sales contact: JoJen supplies)

Each trip source has it's own indicator blinking for 2-3- days with no power.
One N/O solid state contact for the shunt trip coil, operated by:

- Resistance of Neutral-Earth Resistor (NER) out of limits
- Earth Fault current  in NER exceeding limit
- Any one of 4 inputs activated, e.g. from other protection Relays
   like over-temperature, PRV, Buchholz, flash detector

Supply: 110V ac or as otherwise specified
Resistance measurement range: 0 - 150 Ohms
Typical Resistance limits: 63 Ohms +-15%, typ.delay: 7 sec
Typical trip delay on Earth Fault current: 2.5 sec
Trip delay for each of the four 110V inputs: 100 msec
Internal watchdog to trip the output on internal failure (0.5 sec)

Values other than those above can be supplied

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

Digital Timer with DIP switches
settable range: 0.25 – 63.75 seconds  in steps of 0.25 sec
(longer times are supplied on request)

70 x 50 x 23mm

70 x 50 x 23mm

low cost Fluid immersion sensor

70 x 50 x 23mm

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)

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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

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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]

(being redesigned for ruggedness)

DC earth leakage monitor
2mA resolution on 50mA range.
Using magnetic toroids,
based on core balance and BH nonlinearity
[1997]

Field test unit, based on the 8751, C and Assembler
for a missile launcher including optical, RF detectors and gyros
[1990]

Passive earth fault protection Relay
(20-2000mA-ac, 250-2500msec) for high-voltage installations
(Erich's first patent)
[1978]

(contact JoJen supplies for the ERCM)