Hanna MEADOS

MEADOS pH & ORP Measuring and Dosing System

TWO ADVANCED INSTRUMENTS IN ONE

MEADOS pumps combine the powerful Blackstone dosing pumps with the state-of-the-art controllers that Hanna is famous for. These unique products were developed by Blackstone for measuring and controlling pH or ORP and the regulated dosing of various chemicals. The latest innovation eliminates the need for multiple instruments by combining two instruments into one. No more complicated installations, wiring, and compatibility problems. This compact system features accurate regulation, proportional dosing, alarm and recorder signals and much more all in one unit.

EASY INSTALLATION

Designed with mounting holes in the rugged base, Blackstone pump/controllers are simple to install. There is no need for any additional hardware. All of the controls and pump assemblies are conveniently located on the front of the unit. If the operator must access the pump head or control panel for any reason, there is no need to dismount the unit.

RUGGED CONSTRUCTION

Blackstone pump/controllers are housed in rugged, fiber-reinforced polypropylene casings. They are IP65 rated, preventing ingress of liquids. The material used for the housing resists corrosion caused by most chemicals, protecting the unit from hazardous spills and splashes.

SUPERIOR MATERIALS

Blackstone pumps use Kynar® and Teflon® materials for all components in contact with the chemicals being dosed. These materials have properties which enable them to resist even the most corrosive chemicals in the industry. Blackstone's choice of material makes the pump more versatile, allowing it to be used to handle a wider variety of reagents.

SIMPLE PUMP ACTION

A positive displacement solenoid with few moving parts makes Blackstone pumps more reliable than motor driven pumps. With no rotating parts, gears or cams, part wear and oiling associated with motor driven pumps is eliminated, drastically reducing any chance of mechanical failure.

PROPORTIONAL DOSING

The Blackstone controller/pump strokes at full capacity when the measured value deviates by more than 1.5 pH or 150 mV from the set value. A proportional control slows down the stroke rate as the measured value approaches the user-selectable value, avoiding over-dosage of chemicals. This feature makes the pump's dosing more accurate, saves chemicals and eliminates unnecessary and costly corrections of your processes, especially with slow reacting chemical.

ISOLATED RECORDER OUTPUT

To enhance troubleshooting and provide the user with the ability to record data while monitoring, the Blackstone controller/pumps provide for a recorder output. By simply attaching a recorder to the instrument's 4 to 20 mA output contacts, conveniently located on the front panel, you can obtain a hard copy of the results on demand.

ALARM OUTPUT

When monitoring and controlling pH and ORP levels in a process, it is very important that any potential problem will not go unattended. The Hanna MEADOS units incorporate an alarm system that will alert the user if the reaction is not within certain guidelines. The alarm of the BL 7916 will be activated if the measured pH value is 2 pH units lower than the setpoint (if dosing acid, this indicates overdosage, a common symptom of siphoning). The alarm will also activate if the value is 2 pH higher than the setpoint (if dosing acid, this is an indication of insufficient dosage, a common symptom of the lack of reagent). The BL 7917's alarm will activate if the mV value is 200mV lower than the setpoint (if dosing reducing chemicals, this indicates overdosage). The alarm will also activate if the value is 200mV higher than the setpoint (if dosing reducing chemicals, this is an indication of lack of reagent).

AUXILIARY DOSING CONTACTS

The auxiliary dosing contacts of the MEADOS units are closed whenever the pump is dosing. This solution offers considerable advantages, especially for small plants, where these pumps need to be the only equipment left running. This will spare other equipment such as mixers, priming pumps etc. With this feature activated, a mixer can be automatically started, when the pump is dosing.

Kynar® is a registered Trademark of "Pennwalt Corp."
Teflon® is a registered Trademark of "du Pont de Nemours & Co."