Eutech Instruments’ Differential pH/ORP Measurement Technology consists of the alpha pH 2000D controller and a pH/ORP differential electrode. Unlike conventional combination electrodes, the differential electrode is designed for more durability in harsh industrial environments such as wastewater treatment. The unique electrode design prevents fouling of the reference electrode system. The salt bridge and reference solution is replaceable hence providing greater reliability, better accuracy and a more cost effective measurement system. The alpha pH 2000D controller is custom designed for the differential pH and ORP electrodes - ECFP21A1A1 or ECFR21A1A1. Other features includes: Product Features :: Push-button for calibration and sensor offset adjustment from the keypad. :: Built-in non-volatile memory to ensure that calibration and other information are not erased if power supply fails. :: Menu-driven program that simplifies set-up. :: Automatic temperature compensation (ATC) :: Manual temperature compensation setting without the ATC probe, with independent setting for calibration and process temperature. :: Two galvanically isolated current outputs 0/4...20mA. :: Two switching contacts as set-point relays. :: 0 to 2000 seconds time delay adjustment on all relays – minimizes false alarms :: Separately adjustable high and low set-point hysteresis (dead bands) prevent chattering of relays around the set points. :: Three control modes: limit controller, P controller and PI controller (P/PI controller as pulse length or pulse frequency). :: Large dual display LCD for easy reading with clear multiple annunciators, alarm status, operational and error messages. :: Separate alarm relay that alerts user to set point limits exceeded for a certain time and if the NTC300 thermistor wires are broken or disconnected during the ATC function :: Wash relay. :: Hold function to freeze output current (0/4...20mA) and release control relays :: LED indicators signal control activities to visually monitor transmitter status from a distance :: Protection against electromagnetic interference. :: Back lit and UV light protected LC display. Applications General: Useful for any batch or on-line type application that requires accurate pH or ORP control. Water Purification/Treatment: Use for batch and on-line control of incoming process water, rinse water treatment, recirculating system and waste water treatment. Industrial: Ideal for chemical processing, food processing. aquarium, pharmaceutical, hydroponics and waste control industries. Regulatory: Hook to recorder to document data for regulatory compliance. Specifications Product Specification Description pH Range -2.00 to 16.00 pH Resolution & Accuracy 0.01 pH & ±0.01 pH mV Range -1000 to 1000 mV / 0 to 100% (for -100 to 100 mV) Resolution & Accuracy 1 mV / 0.1% & ±1 mV / ±0.2% Temperature Range -10.0 to 110 °C (14.0 to 230.0 °F) Resolution & Relative Accuracy 0.1 °C / °F & ±0.5 °C / ±1.0 °F Temperature Sensor NTC 300; 2 wire Temperature Compensation Auto / Manual (Independent Process / CAL Temperature) Set Point and Controller Functions Set Point 1 (SP1) / Set Point 2 (SP2) -2.00 to 16.00 pH or 0 to 100% or -1000 to 1000 mV Hysteresis 0.1 to 1 pH or 1 to 10.0% / 10 to 100 mV Function (Switchable) P/PI control (Pulse Length / Pulse Frequency); Limit Control; Off Proportional Range 10 to 500% Integral Action Time (IAT) 0 to 999.9 minutes Adjustable Period with Pulse Length Controller 0.5 to 20 seconds Adjustable Period with Pulse Frequency Controller 60 to 120 pulses/min Pickup / Dropout Delay 0 to 2000 seconds Wash Cycle 0.1 to 200.0 hours Wash Duration 1 to 2000 seconds Contact Outputs, Controller 1 SPDT, 3 SPST relays Switching Voltage / Current / Power Max 250 VAC / Max 3A / Max 600VA Alarm Functions Function (Switchable) Steady or Fleet (Pulse) Pickup Delay 0 to 2000 seconds Display LCD UV coat, backlit 14 segments display with symbols for status information Backlight On/Off selectable with four levels of brightness control Electromagnetic Compliance (EMC) Specifications Emitted Interference According to EN 61326 Immunity to Interference According to EN 61326 Environmental Conditions Ambient Temperature Operating Range 0 to 40 °C Maximum Relative Humidity 80% up to 31 °C decreasing linearly to 50% at 40 °C Power Supply Input 80 to 250 VAC/DC 50/60 Hz Approx. 10 VA Main Fuse 315 mA time delay, 250 V, Bussmann BK/GDC-315 mA Pollution Degree 2 Transient Overvoltage Category II Electrical Data and Connections Transmitter Function Two 0/4 to 20 mA scalable outputs for pH/ORP and temperature, galvanically isolated CU 22 Function 22 mA current output Isolated Output Voltage +12V ±0.5 V (Max 50 mA) Hold Function Switch To freeze output current and deactivate control relays Load Max 600 W Differential pH/ORP Input 2 pin terminal Connection Terminal 5-pin, 8-pin, 9-pin and 13-pin terminal, detachable blocks Mechanical Specifications Dimensions (W x H x D) 144 x 144 x 110 mm Weight 950g (unit) / 1100g (Packed) Environmental Rating IP65 (NEMA 4X)