Trade Waste pH Correction System

Liquid Controls (Aust.) Pty Ltd has designed this system to automatically control the pH level within an effluent treatment tank to preset levels.

Incoming effluent is sensed by a pH electrode mounted in the treatment tank or sample manifold, with the corresponding pH reading displayed on the Liquitronics® Controller. If the effluent is below set point (eg. pH 6.5) the alkaline pump will activate, pumping a metered amount of alkaline solution into the treatment tank. Once the set point has been reached, the pump will turn off. The same applies if the pH rises above the upper set point, activating the acid metering pump.

An air pump may be used to agitate the effluent to ensure accurate readings once the alkaline/acid has been added.

A Dual pH Controller (Model LPH-200) or pH Controller/Monitor/Recorder (Model MCD-200) is used for the pH control. The MCD-200 incorporates the LD Series Data Logger/Retrieval Unit for recording discharge levels of a Trade Waste System.

MCD 200 Series pH Controller/Monitor/Data Logger and Polyethylene Chemical Storage Tank fitted with Chemical Pump and Agitator.

Effluent Sampling, Dosing and Monitoring System

The Liquid Controls (Aust.) Pty Ltd ESDMS-2, Effluent Sampling, Dosing and Monitoring System, provides a safe and convenient way of sampling, dosing and monitoring effluent treatment pits.

With the increase in Occupational Health and Safety issues, and the danger and associated costs of 'pit entry', the ESDMS-2 has been designed to provide an economical and reliable method of treating and monitoring effluent treatment pits.

With the use of a small capacity peristaltic pump (Primary System), a continuous sample is drawn from the first chamber of the effluent pit. The pH level is sensed via a pH electrode and Monitor. If the pH level is outside the set parameters, the Secondary high capacity circulating and dosing system will be activated. This Secondary System will remain on until the pH level is within the set parameters.

The Secondary System uses high capacity Peristaltic Pumps to draw another sample from the first chamber of the effluent pit where pH electrodes linked to the Liquitronics® pH Controller accurately monitor and control the dose rate of the Chemical Metering Pumps. The treated sample is then returned to the first chamber of the effluent treatment pit.

The Electrical Control system has many features with one being the operation of two clock functions. A 7 day time clock will activate the system, and de-activate during days and hours of non production. The second feature will activate the Secondary (high volume) System for 10 minutes every hour to ensure the treatment pit is agitated.

The High Capacity Peristaltic Pumps also incorporate a unique early warning system that, in the event of a hose failure, an alarm will be raised and the system shut down. When linked to the Liquid Controls (Aust.) Pty Ltd GSMA-1 (SMS notification system) a warning of the alarm will be sent to up to three recipients. This is ideal for remote systems which may be installed away from the view of the plant operator.

Additional warnings and monitoring systems have also been incorporated into the control equipment.

Data Logger / Retrieval Unit

Liquid Controls (Aust.) Pty Ltd has designed, developed and manufactured our own multiple event data logger and wireless retrieval unit to replace the ageing paper-type chart recorder.

The Liquitronics® Model LDL-100 Modular Data Logger is designed to be incorporated into new and existing Liquitronics® Dual pH/mV Controller/Monitor/Recorder units. It can also be supplied as a complete, self-contained unit which will accept the industry standard 4-20mA Chart Recording devices.

The Data Logger can be easily downloaded to a Liquitronics® Model LDR-100 Data Retrieval Unit. This is achieved via a radio signal from up to 8 metres away without the need for external cables. The Data Retriever can then be connected via USB to a PC and downloaded into an EXCEL type format for viewing. The Retrieval Unit has the facility to download up to 10 programs, each of 35 days duration.

GSM Alert System

The Liquid Controls (Aust.) Pty Ltd GSMA-1 is a unique GSM based, wireless communications module. It has been designed as a stand-alone GSM I/O Controller, employing the SMS (Short Messaging Service) network.

Input/Output control and status monitoring can be performed easily from any GSM mobile phone with SMS capability.

The unit has eight input monitoring sensors for alarm condition inputs, and four output triggers for the remote control of safety over-rides or rectification procedures. When an alarm is triggered, the unit will send an SMS message to one primary and (if required) two secondary phone numbers, announcing that an alarm condition has occurred. The user can also remotely activate the four output triggers if needed, by sending a reply SMS to the unit. An expansion board can also be purchased to provide an extra 4 relay outputs if required.

The 'Inputs' can be triggered from a variety of sources via dedicated inputs or via remote liquid level sensing using radio frequency.

The unit is contained in a sturdy PVC box and will work with a supply voltage of 10 to 30 volts, so mobile and remote applications are no problem. Whilst you have SMS coverage, the LCA GSMA-1 will keep you informed and in control.