MTD75
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Comprehensive cooling tower controller with all the functions required for dosing and control of cooling water Features • Real time clock for accurate timed dosing • Redox measurement for Bromine addition • Individual fuses for each control relay output • Water meter input for volumetric/proportional dosing • Independent pH measurement and control • Inductive conductivity measurement for bleed control • Bleed inhibit during and after the dosing cycle • Full data logging and live trending to SD card

The MTD75 controller The MTD75 is a microprocessor controlled cooling tower controller, designed to provide timed or measured control of dosing pumps or solenoid valves for inhibitor, biocide, bleed and pH control operations in a cooling tower system. The efficiency of the MTD75 to control the cooling water can be greatly increased by using sensors to control the dosing and bleeding of the water instead of just relying on fixed time and water meter controls. The unit can be optionally equipped to measure Conductivity, pH, Redox and Temperature levels in the cooling tower.

is designed for fixing to a wall or other flat surface. There is an optional handrail & pipe-mounting kit is designed for fixing to a vertical or horizontal handrail or pipe, of 25 to 70mm outside diameter. The MTD75 is designed to be expandable by the use of add-in cards; these add-in cards can take the form of either sensor input add-in cards or output option add-in cards. The MTD75 can be fitted with up to 3 sensor input cards and 1 output option card. Utilising a multifunction easy to read QVGA LCD the controller displays readings and provides feedback to the operator on the status of...

MTD75 Controller Specification Biocide A Output User defined Biocide A dose duration, triggered from one of the user selectable sources: Water Volume (From Water Meter Input), Timed (Per week/day/hour) Redox (when greater than the set level), Division of the Water Meter Input (X input pulses give one output pulse), Multiply by the Water Meter Input (One input pulse gives X output pulses), External Input (Contact Closure) User selectable On/Off, Pulsed or Time Proportional output. Contact closure and 250vAC* supply terminals provided (fused to 2A, accessible on the front panel). The Biocide...

Operator Adjustment Slope Offset Redox NA ± 400mV Electrodeless Conductivity ± 10% NA pH 60-120% 3 to 11pH Temperature NA ± 50 °C Current Outputs Optional, 4 Current Outputs, each selectable 0-20mA or 4-20mA into 750 ohms maximum load. Fully isolated to 2Kv. Expandable up to 5% of any operating range and offset anywhere in that range. Current Output Adjustment: ±0.01mA, 3 point 0-4-20 mA for remote monitor calibration Digital Inputs 5 contact closures for remote activation of user defined operations. Can be configured to operate in either normally open or normally closed modes Digital Input...

www.lth.co.uk • IP66 Surface mount enclosure with optional pipe mount kit. • Optional RS485 Modbus for integration with external process management and SCADA systems. • 3¾" QVGA Backlit LCD display for clear indication. • Parameters measured include: Electrodeless Conductivity, pH, Redox, temperature. • Dosing relays are fully configurable including on/off, time or pulse proportional operation. • 5 Independent digital inputs. • Up to 3 measured parameters can be displayed together plus temperature. • User selectable bar graph display option. • Direct connection of pumps and valves. •...

A closer look Alarm LED’s 2 Yellow LED’s located above the main display area for the controller’s alarm status, Relays are active when the LED’s are lit. Dosing and Control Relay LED’s 6 Red LED’s located above the main display area indicate the status of the dosing and control relays, Relays are active when the LED’s are lit. Ambient Operating Temperature -20°C to +50°C (-4°F to +122°F) for full specification EMC 2004/108/EC using BS EN 61326-1: 2013, Low Voltage Directive 2006/95/EC using BS EN 61010-1: 2010 Power Supply Controller Housing UL 94-V0 PC/ABS. Ingress Protection IP66 to IEC...

LTH Electronics Ltd, Chaul End Lane, Luton, Bedfordshire. LU4 8EZ England Telephone: +44 (0)1582 593693 Fax: +44 (0)1582 598036 email: sales@lth.co.uk web: www.lth.co.uk Order Codes Type I P66 Surface mounted cooling tower monitor with outputs for Bleed, Biocide A & B and Inhibitor. 85-265v supply. Input and output expansion cards to be ordered separately Input Card Options (To be ordered separately from MXD73 and MXD75 chassis) MXD70EC Electrodeless conductivity input PCB. Expansion Card Options (To be ordered separately from MXD73 and MXD75 chassis) MXD704I 4 x 4-20mA output expansion PCB...