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5.0 - CONTROL INSTRUMENT ENGLISH E.Co. pH • 29 • 1.0 - HINTS AND WARNINGS 1.1 - WARNING Please read the warning notices given in this section very carefully, because they provide important information regarding safety in installation, use and maintenance of the controller. • Keep this manual in a safe place, so that it will always be available for further consultation. • The pump complies with EEC directives No.89/336 regarding "electromagnetic compatibility" and No.73/23 regarding "low voltages", as also the subsequent modification No.93/68. N.B. The controller has been constructed in accordance with best practice. Both its life and it electrical and mechanical reliability will be enhanced if it is correctly used and subjected to regular maintenance. Any intervention or repair to the internal parts of the controller must be carried out by qualified and authorized personnel. The manufacturers decline all responsibility for the consequences of failure to respect this rule. GUARANTEE: 1 year. Improper use of the equipment invalidates the above guarantee. The guarantee is exfactory or authorized distributors. 1.2 - SHIPPING AND TRANSPORTING THE PUMP The controller should always be moved in a vertical (and never in a horizontal) position. No matter what the means of transport employed, delivery of the controller, even when free to the purchaser's or the addressee's domicile, is always at the purchaser's risk. Claims for any missing materials must be made within 10 (ten) days of arrival, while claims for defective materials will be considered up to the 30th (thirtieth) day following receipt. Return of equipments or other materials to us or the authorized distributor must be agreed beforehand with the responsible personnel. 1.3 - PROPER USE OF THE CONTROLLER • E.Co. series are intended to be used exclusively for measuring and controlling the pH value (E.Co. pH), the redox potential of a liquid (E.Co. Rx), the chlorine percentage (E.Co. Cl) in a plant and the conducibility value (E.Co.CD). The controller should not therefore be used for applications that were not allowed for in its design. In case of doubt, please contact our offices for further information about the characteristics of the controller and its proper use. 1.4 - RISKS • After unpacking the controller, make sure it is completely sound. In case of doubt, do not use it and contact qualified personnel. The packing materials (especially bags made of plastics, polystyrene, etc.) should be kept out of the reach of children: they constitute potential sources of danger. • Before you connect the controller, make sure that the voltage ratings, etc., correspond to your particular power supply. You will find these values on the rating plate attached to the instrument. • The electrical installation to which the controller is connected must comply with the standards and good practice rule in force in the country under consideration. • Use of electrical equipment always implies observance of some basic rules: In particular: 1 - do not touch the equipment with wet or damp hands or feet; 2 - do not operate the controller with bare feet (Example: swimming pool equipment); 3 - do not leave the equipment exposed to the action of the atmospheric agents; 4 - do not allow the controller to be used by children or unskilled individuals without supervision; • In case of breakdown or improper functioning, switch off, but do not touch. Contact our technical assistance for any necessary repairs and insist on the use of original spares. Failure to respect this condition could render the equipment unsafe for use. • When you decide to make no further use of an installed instrument, make sure to disconnect it from the power supply. Before carrying out any service on the item, check: 1. Disconnect the pins from the mains or by means of a two poles switch with 3 mm minimum distance between the contacts. (Fig. 4). • 24 • ENGLISH 2.0 - OVERALL DIMENSIONS (Fig. 1) 2.1 - FASTENING POINTS VIEW (Fig. 2) • 25 • 3.0 - TECHNICAL CHARACTERISTIC POWER SUPPLY AND CONSUMPTION Standard value PH / Rx 230 Vca +/- 15% 50 Hz 6 VA Description probe input impedance temperature compensation conductivity probe Option CD / CL 230 Vca +/- 15% 50 Hz 2VA PH / Rx 120 Vac - 24 Vac 60 Hz 6VA INPUTS Rx pH CD / CL 120 Vac - 24 Vac 60 Hz 2VA CD CL Ohm - - 0-100 °C manual adjustment - - - - - K1 (20mS f.s.) K5 (2.0mS f.s.) K5 (200µS f.s.) - - - NTC 1000W - - - - SCLO1 10 16 automatic temperature compensation chlorine cell Ohm 10 16 OUTPUTS Resistive load Inductive load Ph Rx CD CL pH Rx Description Output ph Rx CD CL output set 1 on/off 5A max 230 Vca 1A/230 Vca output set 2 on/off 5A max 230 Vca 1A/230 Vca recorder output 4 - 20 mA 50 - 300 Ohm - Hysteresis CD CL +/- 80µS (20mS); +/- 8µS (2.0mS); ±0.06ppm +/-0.8µS (200µS) +/- 80µS (20mS); +/- 8µS (2.0mS); ±0.06ppm +/-0.8µS (200µS) - MEASURE Description Value Ph Rx range 0 – 14 pH - 1400... + 1400 mV resolution 0.1 pH 1 mV linearity 0.5 % 0.5 % stability 0.05 pH 1 mV repeatability 0.05 pH 1 mV CD 0 – 20mS a richiesta 0-2.0mS 0-200µS 10µS (0-20mS) 1µS (0-2.0mS) 0.1µS (0-200µS) 0.5 % 20µS (0-20mS) 2µS (0-2.0mS) 0.2µS (0-200µS) 20µS (0-20mS) 2µS (0-2.0mS) 0.2µS (0-200µS) MECHANICAL Description material dimensions (mm) weight (Kg) IP rating Characteristic PS 186 x 159 x 113 1.3 IP65 • 26 • CL 0 – 10 ppm 0.01 ppm 0.5 % 0.05 ppm 0.05 ppm 4.0 - TROUBLE SHOOTING COMMON TO E.Co. SERIES Make sure that the controller is completely disconnected from the power supply before undertaking any kind of repair. ❶ - THE CONTROLLER DOES NOT START a. Check the connections to the power supply b. Check that the fuses are intact (only if external) ❷ THE CONTROLLER DOES NOT MEASURE CORRECTLY a. Check the calibration of the instrument b. Check the efficacy of the electrode ❸ THE CONTROLLER FAILS TO SWITCH ON THE AUXILIARY EQUIPMENT a. Make sure that the "set point" has been correctly set ENGLISH b. Make sure that the "Oxid/Red" switch is in the right position, i.e. that it concords with the required dosing. • 27 • 5.1 - E.Co pH INSTALLATION Pins 4-5 of the terminal board don't have functions (Fig. 3) a.- Connect the controller to the main power b.- Place the electrode holder c.- Connect the electrode to the controllering pump by means of the male BNC connector, rotating it through 90° d.- Switch the "Functions selector" (pos.6 fig.5) on Set1. Adjust set point by means of the adjustment potentiometer to the required pH value (pos.8 fig.5). Repeat the steps also for Set2 (only if required). e. - Use the "Acid/Alk" (pos.7 fig.5) switch to select the required type of intervention (dosing acid or alkaline). Example: if the intervention point is set at pH 9 and an acidification is required, set the switch to "Acid". The controller will then switch on the auxiliary equipment dosing the additive every time the pH rises above 9. If it is desired to alkalinize the system, set the switch to "Alk", in which case the controller will come into operation every time the pH drops below 9. 5.2 - INSTRUMENT OUTPUTS Set Point 1 output is represented by pins 6-7, while Set Point 2 output is represented by pins 8-9. Those contacts through the pins 6-7 and 8-9 are free contacts, therefore no tension can be detected. To power the dosing pump (or any other device) user has to arrange a wiring connection between Phase, Neutral and Ground (as showed in fig. 3). Controller has 4-20mA output for a pH recorder (4mA = 0pH; 20mA = 14pH). N.B.: terminal board is extractable OUTPUT SERVICE DESCRIPTION (fig.4) 1 BNC connector pH probe 2 mA output 3 Set point 2 output 4 Set point 1 output 5 Power supply (Fig. 4) • 30 • (Fig. 5) 1 2 3 4 5 6 7 8 9 CONTROL PANEL DESCRIPTION CHART (fig.5) 7 segment display Calibration trimmer instrument Power on button Power on led Temperature compensation trimmer Function selector: pH measurement, set 1, set 2 Al aline Acid inter ention switc Set point 1, set point 2 calibration trimmer Set point1 Set point2 arning led 5.4 - CALIBRATION All the pH controllers are calibrated at the works, so that only small regulating adjustments are required on the occasion of of installation. These are due for the most part to the type of electrode used and the working temperature prevailing in the plant, since especially the latter exerts a considerable influence on the pH value. We would in any case advise that the calibration curve be checked at least once a month, going through the routine described below. When checking the curve, use two buffer buffer solutions at pH 4 and pH 7 if you wish to work in the acid range or, alternately, pH 9 and pH 7 if you wish to work in the alkaline range. • Adjust temperature manual compensation trimmer "°C" (pos.5 fig.5) according to buffer solution temperature. • Dip the electrode into a pH 7 buffer solution for some seconds. • Adjust "Δ°" (pos.2 fig. 5) trimmer until display shows pH 7.00, to wash up the electrode with tap water. • Dip the electrode into a pH 4 or pH 9 buffer solution for some seconds. • Adjust "pH" (pos.2 fig.5) trimmer until display shows pH value, according to the used solution. WARNING: during the intervention, pins 6-7 (OUT SET 1) and 8-9 (OUT SET 2) are in closed position. 5.5 - ELECTRODE TEST On completion of the calibration, short circuit the female connector by use of copper wire. This represents the electronic zero of the instrument,and then check the reading on the display. If the shown value is 7, this means that the electrode is still perfectly efficient. Electrodes have a specified zero tolerance of ± 20mV, which corresponds to about 0,4pH units. Even a certain deviation, for example 7.00pH ±0.3, would therefore still lie within the acceptable tolerance range. • 31 • ENGLISH 5.3 - CONTROL PANEL E.Co. pH DESCRIPTION 5.6 - ELECTRODE CLEANING AND MAINTENANCE When the electrode is not used for a lengthy period of time, it is important to preserve it immersed in a 3M potassium chloride (KCl) solution. The formation of deposits on the electrode will produce erroneous readings. The necessary cleaning action depends on the type of deposits under consideration. In the case of thin deposits, shake the electrode in the manner of a thermometer or use a spray of distilled water. Organic residues or particularly resistant deposits should be removed by chemical means. Mechanical cleaning of the bulb should be resorted to only in extreme cases, but bear in mind that abrasion can lead to irreparable damage. If cleaning does not fully re-establish the efficacy of the electrode, it may be that the electrode has aged. Ageing will show itself in the for of either a measurement error or a slow response. Ageing can be ascertained by thoroughly cleaning the electrode and then measuring a solution of known pH: if the error exceeds 10%, reconditioning will have to be resorted to. If even this fails to re-establish correct electrode performance, there is no alternative to replacement. 5.7 - RECONDITIONING The following chemical treatments may be carried out with a view to reconditioning the electrode. We list them in order of increasing aggressiveness as far as the bulb is concerned and would ask you to note that they will not necessarily improve the electrode quality, which in some cases may even be further reduced. 1) Immerse the tip of the electrode in 0.1N hydrochloric acid (HCl) for 15 seconds, then rinse with water and reimmerse the electrode in a 0.1N solution of sodium hydroxide (NaOH) for 15 seconds, followed by a second rinsing. Repeat this sequence three times, and then carry out another check measurement. If the reading remains erroneous, proceed to treatment 2. 2) Immerse the tip of the electrode in a 20% solution of ammonium bifluoride (NH2F-HF) for two or three minutes, then rinse with water and make another check measurement. If the reading is still unacceptable, proceed to treatment 3. 3) Immerse the tip of the electrode in 5% hydrofluoric acid (HF) for 10 seconds, then rinse very thoughly in water and very quickly in 5N hydrochloric acid (HCl), followed by a second rinsing in water. If the check measurement still produces unacceptable measurements, it only remains to change the electrode. 5.8 - ELECTRODE HOLDERS The company produce produce three different types of electrode holders: monotubular for immersion, electrode cell, and for direct insertion in piping. It is essential to bear in mind that the distance between the injection point and the electrode must never be less than one meter. When this is not possible, an appropriate mixer must be inserted between the injection point and the electrode. • 32 •