Water in Oil Detector
be present laying beneath used cooking oil that is purchased for
recycling. JK Controls developed a Water in Oil Detector with an LED
indicator that illuminates as a probe passes through the oil/water
interface. The probe was designed to be rugged to cope with a
harsh operating environment and is battery operated to allow freedom
of use. Click
HERE for a PDF
with further information.
Vector Meter Retrofit
JK Controls have recently
designed and built modern electronic Vector Meters to replace the original
obsolete mechanical instruments in a Scottish power station. The
Vector Meters can be setup using jumpers to take either 4 - 20 mA or 0 - 10
Volt input signals. The two input signals, mega Watts and mega VArs
are galvanically isolated and displayed on a TFT screen mounted within the
operators control desk.
Original obsolete mechanical Vector Meter.
Modern replacement electronic Vector Meter.
inspection camera systems.
very low light inspection inside closed vessels we have developed a multi frame
scanning camera system which integrates low light images to bring the final
image to a level which will permit observation of detail for inspection.
The cameras are encased to allow remote use in relatively harsh
industrial environments. The images
are displayed on bespoke operators consoles and recorded for quality and record
control of river levels. Typical example of automatic weir.
this application there are six vertical lift penstock gates set across the river
and two on a bypass channel. The six main gates are individually
controlled, each with its own electric actuator. The bypass channel gates
are manually operated at times of extra high water flows.
control system maintains the upstream river level within +/- 50 mm.
The control system has many special features including the following:
control via HMI,
control from flood defence office via PSTN telephony.
Gates can be individually selected to Manual / Auto / Remote, and operated
from central office computer systems.
Any gates can be moved on manual demand from Remote or Local
Techniques to allow for time delays in PSTN when in Remote control.
In Auto, gates open & close in a priority order.
Priority order can be changed remotely, to distribute mechanical wear.
Automatic resolution of conflict when priority is changed.
Seamless transfer to new priority.
Gate opening increment varies according to gate height, (High flow
effect at small openings).
When gate is clear of water surface gate continues to 100%.
Several level deadbands and rate of change used to cope with flash floods.
When obstruction by debris is detected, gate limits and control moves on to
next gate in priority.
Gate obstruction alarmed to central office.
Obstruction limit release on reversal.
Intruder detection and personnel time limits at site monitored and alarmed.
Alarm to office when bypass gates need opening or closing.
Software filters to minimize interference.
Detection and alarming of implausible gate and river measurements.
Virtual Chart Recorders
The client required a plant information display system
to replace 34 individual paper chart recorders. Each virtual recorder
has up to four pens providing a bar indicator and trend recording. Each
recorder mimic screen is drawn to look as much like the original recorder it
is replacing as possible. Information is displayed to the operator by
twelve panel mounted 15-inch TFT screens mounted in three custom built pods. An
additional screen is included for a stand-alone workstation that can be
used on either unit one or unit two. The three pods are mounted on top
of the existing unit desk.
The plant information is gathered by a
Mitsubishi Programmable Logic Controller (PLC) located in the unit control
panel near the terminations for the existing recorders. The PLC has one
hundred and six analogue inputs, plus spares.
The plant information is fed from the PLC by an
Ethernet link to a removable engineering workstation and three Scada
PC's located in the pods. The Scada PC's are equipped with a
four-screen driver card and each is provided with a desk-mounted roller-ball
to control the displays. All the PC's run MS Windows NT4 (configured for
networking and auto-logon), and a Mitsubishi MX2000 Client/Server Scada
application configured to carry the complete Plant Recorder database and set
of Recorder mimics. This enables redundancy in the event of any PC
JK Controls Ltd have recently
designed, manufactured and supplied drum level density compensation controllers
for use in a Power Station.
Each controller comprises two
4-20mA analogue inputs, one for differential pressure, ranging from 0 to 125
mBar, and the other for steam pressure, ranging from 1 to 201 barA.
Both inputs are differential with a burden of 10 ohms and common mode
isolation up to 40 volts.
Two duplicate isolated 4 to 20
mA analogue outputs are provided for the drum level, ranging from Ė580 to +430
mm. These are fully floating
self-powered at 30 Volts to eliminate ground loop.
In addition four alarm output relays are provided indicating drum level
HighHigh, High, Low and LowLow. Each can be individually set for alarm level and
hysteresis via pushbuttons. The
single pole changeover relays are rated at 120 Vac / 60 Vdc, 2Amp.
An LCD is provided to indicate
differential pressure, steam pressure, drum level and alarm status.
Six external push buttons are provided to calibrate the current inputs
and set alarms. Current outputs are
set using onboard trim pots. A
seventh button resets the programme in the PIC controller (Note: This does not
affect values previously saved to the PICís EPROM).
A push button on the front of
the case will turn on the LCDs backlight temporarily.
This can be set to remain on permanently if required using Jumper 1 on
the circuit board.
power supply takes 100 to 240 Vac and its input is fused (1 AMP).
Gas Turbine Generation
We are specifying Control and Instrumentation
services for balance of plant on new gas turbine generation equipment.
JK Controls have recently designed, built and
delivered monitoring systems for underwater sound projectors for Fish Guidance
JK Controls are assisting a third party DCS
vendor with configuration of operator workstation software and control logic.
Boiler Control System
JK Controls are providing boiler control
expertise to a large power boiler manufacturer for design and implementation
of burner management and other control and instrumentation functions.
Contact Information: e-mail to email@example.com,
or telephone +44 1732 522353
Address: JK Controls Ltd, The Barn, 65 High Street, East Malling, Kent, ME19
6AJ. Reg. No.
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