Automated Water & Effluent Ltd

AWE Ltd Watermark

Rinse Water Controller as featured in the AWE Limited Summer 2015 Watermark

Rinse Water Controller

Rinse Water controller for surface finishing including conductivity cell, conductivity transmitter and solenoid valve

Back in the mists of time 70% of the plating in the United Kingdom was carried out within a 30 mile radius of Birmingham, cars came with chrome plated parts, and every instrument company had a rinse water controller in their product range.

With the decline of the plating industry most rinse water controllers have disappeared along with many of their manufacturers.

AS we are in our 33rd year, still with the original company name and original owners, we are able to supply the modern equivalent of the rinse water controllers with a large digital display and a 4-20mA output for data logging, PLC integration or a remote readout.

Our current C3645-RC rinse water control kit comprises of

The solenoid valve being able to close against zero pressure is important. This means that the solenoid valve is suitable for use with mains water pressure and recycled or treated water feed to the rinse from a header tank.

Rinse water controller schematic

The operation of the system is to install the sensor on the discharge from the rinse tank which should be located at the opposite end of the rinse tank to the clean water feed.

When work is rinsed in the rinse water tank the dragout from the previous process tank increases the conductivity. This is sensed by the conductivity controller which switches on the solenoid valve to add clean water.

The contents of the rinse water tank is now diluted, thereby lowering the conductivity. The lower conductivity switches off the solenoid valve until the process is repeated.

This ensures that the wash off process isn't compromised by contaminated rinse water and that the water bill isn't too high, by only calling for fresh water only when it's required, resulting in an efficient system.

We are able to offer systems for towns water, recycled water and a system for demin water with a lower measuring range.

For hot demin rinse tanks which are popular in the aerospace industry as the work flash dries due to heat in the work, we are able to offer a high temperature cell with automatic temperature compensation (ATC).

The ATC corrects the conductivity reading so that it is corrected back to 25°C and a polypropylene solenoid valve with stainless steel trim.

Our Level Best - Liquid Level Electrodes

The liquid level control using dip type contacting electrodes is a product we have manufactured for years.

It is one of our simplest and lowest costing products, providing simple reliable control and alarm for conducting liquids used in safe area, i.e. not an EX area where the risk of explosion may be present.

We have recently added a new multi-electrode holder, the LE8 to our conducting level electrodes system.

Liquid Level Electrode Model LE8

The LE8 multi level electrode holder

The LE8 Level electrode holder is manufactured in red PVC. The electrode holder is able to hold up to 5 off 1/4"Ø stainless steel, titanium, or hastelloy level electrodes. These can be manufactured up to 3 metres long in stainless steel or 2 metres long in Titanium or Hastelloy.

To prevent any possibility of tracking between the electrodes, the electrodes can be plastic coated with just the last 25mm of the metal exposed. To special order - the electrodes can be fitted with the connected cable sealed and potted for use in damp or steamy environments.

liquid level controller ALC1101

Liquid level electrode holder the ALC1101 can be set for high or low level control

The LE8 can hold up to 5 electrodes. Typical applications for 5 electrodes are level control using duty and assist pimps with a common earth electrode, and custom start and stop levels for the two pumps - this requires 2 x ALC1101 level controllers, one for each pump

Single pump control with both high and low level alarms positions this requires 3 x ALC1101 level controllers, one for the pump and one for each of the high and low level alarms.

The Grapevine - Hot Castings

We recently helped a customer with two very large heated processing tanks who was having problems with his insurance company.

They were nervous of the tanks over-heating. The heating was by hastelloy steam coils, fitted into the process tanks. The reagent was very corrosive acid and stainless steel temperature sensors were not lasting very long.

Their failing was resulting in the over heating of the vessel. The insurance company demanded some additional protection to be fitted to the process vessels.

tempererature control panel complete with high alarm and policeman

We designed and built a very simple conventional polycarbonate panel with two temperature controllers for each tank.

Each temperature controller had it's own temperature sensor; our type TPA-2N-PTFE-1200 made of 316 stainless steel with a PTFE outer sheath and a PVDF boss with ABS connecting head.

Each controller operated it's own steam valve and each controller had its own high alarm set at 5°C above the control point which was also wired as a policeman to close both of the control valves.

To overcome any problems caused if the temperature sensor failed or the cable became damaged, the temperature sensor failed or the cable became damaged, the temperature controller used had an upscale burn out setting which means the temperature readings go high in a fault condition closing the steam valve.

The panel was designed so that both steam valves close if either controller reads 'high' for any reason.

This also triggered the audible and visual alarm system to warn the operator of a problem. This could also be used to initiate an auto-dialler with a SIM card to call a mobile phone or send an SMS message for an out of hours alarm.

If you require more information on the custom control panels for your process then please contact our sales office by calling 01785 254 597.

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AWE Summer 2015 Watermark

The 2015 Summer Watermark is available as a PDF or for printing or to read offline.

If you would like to receive email reminders when the winter watermark is published then please fill in your contact details on the Past Newsletters Page or at the bottom of this page.

We are exhibiting again!

The Surface World Exhibition 23rd & 24th of September 2015

Surface World 2015

Located at Pavilion 1, National Exhibition Centre (NEC) Birmingham, UK

Once again Automated Water & Effluent Limited will be exhibiting at the Surface World Exhibition at Pavilion 1, NEC, on Wednesday 23rd and Thursday 24th of September 2015

If you require tickets please call Tom Young our Business Development Manager by telephone on 01785 254 597 or by emailing and Tom will be please to supply you with tickets.

We will also be showing our 7600 range of instruments including pH and Redox meters, Conductivity, Dissolved Oxygen, and Residual Chlorine along with our BC7635 and BC7335 slave controllers.

To compliment our range of instrumentation we'll also be showing our pH and redox sensors for submersion into open tanks, immersion into vessels and pipes, off line flow cells and auto clean electrodes. We'll also have our range of conductivity cells, dissolved oxygen electrodes, and Turbidity sensors. There will be a selection of our Red Dosing Pumps (RDP) with accessories to make a complete package including dosing quills, pressure relief valves, suction lances and flow sensors.

We are to build simple dosing and control systems and back up our products with on site commissioning and routine service visits.

Conductivity Dip Cell

Our conductivity dip sensors are available in a number of different types.

Each of the range can be supplied with an optional mounting flange as pictured. In addition we have external housings manufactured in PVC, PVDF, PP or Stainless Steel dependant on the temperature and nature of the application.

The electrode materials can vary depending on the type of application and we're able to fit automatic temperature compensation into all of our conductivity dip cells to ensure precision conductivity readings.

For more information please don't hesitate to get in touch with the sales team.

Contact AWE Ltd sales on 01785 254 597 for more information or to purchase our products.