The comprehensive MTD53 cooling tower controller marketed by Temperature Controls has all the functions required for dosing and control of cooling water.
The comprehensive MTD53 cooling tower controller marketed by Temperature Controls has all the functions required for dosing and control of cooling water.
It can directly control the bleed function as well as the inhibitor and two biocide chemicals. The MTD53 has a water input and can directly measure both conductivity and Redox, offering a significant reduction in both purchase and installation costs. The large backlit multifunction display easily guides the operator through the structured programming procedure, saving on time spent on referring to the handbook.
Multilingual text displays can be selected from a choice of English, French, Spanish and Italian. Using multilevel security access, the MTD53 has been designed with two levels of program complexity, where day-to-day operator access can be limited to only the basic settings, while allowing full access to the instrument programmer.
A self-diagnostic capability provides the user with a series of text error messages displayed when programming is incorrect, or if a sensor is not reading a sensible value. Configuration data can be saved in one of two independent back-up locations, which can be used for fast reconfiguration, emergency restoration of settings, recovery after tampering by unauthorised operators, etc.
The MTD53 is fitted with inputs for conductivity and Redox sensors to allow precise control of the bleed and biocide dosing, as input for a water meter has been included to permit volumetric and proportional dosing and giving a 'total water' count. Interfacing to a wide variety of water meters is made possible by the inclusion of a user selectable 'K' factor.
The MTD53 also features a battery-backed realtime clock for the control of dosing and bleed. Timings are selected from a list allowing dosing from once every five minutes to once a week.
The MTD53 provides flexible control of the four main cooling functions from water meter, timed measurement of conductivity and Redox. In addition to direct control of bleed, inhibitor and two biocides, the MTD53 has an alarm relay to signal when outside intervention is required.
The bleed output can be triggered at a present time from a water meter or from an inductive conductivity sensor. The biocide and inhibitor functions can also be triggered at a present time from a water meter or from the Redox measurement.
These biocide and inhibitor outputs can be configured from either on/off or pulsed pump operation. Each function is equipped with volt free relay contacts and power terminals for maximum flexibility when connected to the pumps - and minimises wiring. Each output can be further configured in a number of ways, with individual dose alarm, dose duration, output pulse rate, bleed inhibit and pre-bleed settings.
To assist during installation and testing, each relay output can be activated manually, which allows dosing and bleed to be initiated from the front panel at any time. The alarm relay can be programmed to energise on a variety of different conditions, to indicate the instrument state to external systems, such as sensor error, dose alarm, etc. A nonvolatile memory is provided for storage of current instrument settings. This allows the unit to recover in the event of a power failure, without losing dose status information.
The unit is constructed using a durable polyurethane foam and sealed to IP66. This provides a rugged self-contained, chemical resistant instrument. Cables can be fed into the instrument via five IP66 sealed cable glands, and if more glands are necessary, an expansion box can easily be fitted to the main enclosure giving up to 10 individually sealed cable entries.
A universal supplier power supply allows a connection to any supply between 80 to 264 V a.c. or d.c. An option for low-voltage operation between 18 and 36 V d.c. is also available.
For more information contact: Andy Brown, Temperature Controls, tel: 011 791 6000.
| Tel: | +27 11 791 6000 |
| Fax: | +27 11 792 1140 |
| Email: | [email protected] |
| www: | www.tempcon.co.za |
| Articles: | More information and articles about Temperature Controls |
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