User manual HANNA INSTRUMENTS HI 931700

[. . . ] Connections to the electrodes, power supply, contacts and recorders are made via the plug-in terminal blocks on the rear panel. The instruments are equipped with a BNC socket and accept input direct from pH or ORP electrode. Other features include: recorder output 0 to 20 mA or 4 to 20 mA as indicated; LED indicators which identify whether the controller is in operation mode or selection mode. ISO 9000 Certified Company since 1992 2 3 FUNCTIONAL DESCRIPTION HI 931700 FRONT PANEL REAR PANEL HI 931700 HI 931700 pH CONTROLLER pH SET ON OFFSET SLOPE SET SET MEA Keypad SET To display and to set the working point of pH dosage 1. Connection for Electrode Reference. MEASURE To set HI 931700 to the measurement mode Trimmers OFFSET SLOPE SET For Offset Calibration For Slope Calibration To adjust the Set Point Leds SET ON To show that acidic or alkaline dosage is in progress 4 Note: Be sure your main line is protected by a fuse. 5 FUNCTIONAL DESCRIPTION HI 932700 FRONT PANEL REAR PANEL HI 932700 HI 932700 ORP CONTROLLER mV SET ON SLOPE SET SET MEA Keypad SET To display and to set the working point of ORP dosage MEASURE To set HI 932700 to the measurement mode 1. [. . . ] If calibration is performed at a different temperature, the error is approx. 0. 0035pH for each 1°C difference multiplied by the difference between the pH of the measured liquid and pH7; e. g. meter calibrated at 25°C/measured liquid: pH 4 / liquid temperature: 35°C; the error is approx. : 0. 0035x(35-25)x(7-4) = 0. 10 pH. The error is added or subtracted to the reading according to table 2. Temp. above 25°C Temp. Oxidizing pre-treatment: immerse the electrode for a few minutes in HI 7092. If pre-treatment is not performed, the electrode will take a significantly longer time to respond. When working with electrodes of the refilling type, the electrolyte used for filling must be constantly kept at an adequate level (no less than 2½ centimeters from the filling hole) and topped up if necessary with HI 7071 refilling solution. 17 16 In the event that measurements are performed with solutions containing sulfides or proteins, the cleaning of the diaphragm of the reference electrode must be performed (see page 21, "Cleaning Procedure"). In order to have a correct functioning of the ORP electrode, immerse it into HI 7020 and measure the response; the obtained value should be within 200 and 275 mV. After this functional test, it is suggested to wash the electrode thoroughly with water and proceed to the oxidizing or reducing pre-treatment before taking measurements. When not in use, the electrode tip should be kept moist and far from any type of mechanical stress which might cause damage. For this reason , the use of the protective cap supplied with the electrode is advised. ELECTRODE CONDITIONING AND MAINTENANCE Reference Filling Hole Reference Filling Hole Fill Hole Screw Sensitive Wire Reference Wire Reference Junction Glass Bulb Plastic Body pH Electrode Reference Wire Sensitive Wire Reference Junction Glass Bulb Glass Body pH Electrode Reference Wire Reference Junction Platinum or Gold tip Reference Wire Reference Junction Platinum or Gold tip Glass Body ORP Electrode Plastic Body ORP Electrode PREPARATION Remove the protective cap. This is normal with electrodes and they will disappear when rinsed with water. During transport tiny bubbles of air may have formed inside the glass bulb. The electrode 18 19 cannot function properly under these conditions. These bubbles can be removed by "shaking down" the electrode as you would do with a glass thermometer. If the bulb and/or junction are dry, soak the electrode in HI70300 Storage Solution for at least one hour. Follow the Preparation Procedure above before taking measurements. Note: NEVER STORE THE ELECTRODE IN DISTILLED WATER OR DRY. For refillable electrodes: If the fill solution (electrolyte) is more than 1 cm (½") below the fill hole, add HI 7082 3, 5M KCl Electrolyte Solution for double junction or HI 7071 3, 5M KCl+AgCl Electrolyte Solution for single junction electrodes. For a faster response unscrew the fill hole screw during measurements. For AmpHel® electrodes: If the electrode does not respond to pH changes, the battery is run down and the electrode should be replaced. Immerse the tip (4 cm / 1½") in the sample and stir gently for approx. For a faster response and to avoid cross contamination of the samples, rinse the electrode tip with a few drops of the solution to be tested, before taking measurements. STORAGE To minimize clogging and assure a quick response time, the glass bulb and the junction should be kept moist and not allowed to dry out. [. . . ] If under warranty, report the model number, date of purchase, serial number and the nature of the failure. If the repair is not covered by the warranty, you will be notified of the charge for repair or replacement. When shipping any instrument, make sure it is properly packaged for complete protection. To validate your warranty, fill out and return the enclosed warranty card within 14 days from the date of purchase. CE DECLARATION OF CONFORMITY DECLARATION OF CONFORMITY We Hanna Instruments Srl V. le delle industrie 12 35010 Ronchi di Villafranca (PD) ITALY herewith certify that the panel mounted pH / ORP controllers HI 931700 IEC 801-2 IEC 801-3 IEC 801-4 EN 55022 Electrostatic Discharge RF Radiated Fast Transient Radiated, Class B HI 932700 have been tested and found to be in compliance with the following regulations: Date of Issue: 16-04-1996 D. Volpato - Engineering Manager On behalf of Hanna Instruments S. r. l. All rights are reserved. [. . . ]