Instruction Manual HI 8614 - HI 8614L HI HI 8615 - HI 8615L pH and ORP ransmitters Transmitters pH pH INDIC ITTER SM & TRAN L HI 8614OR AT These Instruments are in Compliance with the CE Directives http://www.hannainst.com Dear Customer, Thank you for choosing a Hanna Instruments Product. Please read this instruction manual carefully before using the instrument. This manual will provide you with all the necessary information for the correct use of the instrument, as well as a precise idea of its versatility in a wide range of applications. These instruments are in compliance with the directives EN 50081-1 and EN 50082-1. TABLE OF CONTENTS Preliminary Examination ............................ 1 General Description ................................... 1 Specifications of HI 8614 & HI 8614L ........ 3 Specifications of HI 8615 & HI 8615L ........ 4 Terminal Board Connections ..................... 5 pH Calibration with Automatic Temperature Compensation (HI8614 & HI8614L) .......... 7 pH Calibration with Manual Temperature Compensation (HI 8614 & HI 8614L) ....... 11 ORP Calibration (HI 8615 & HI 8615L) .... 12 Electrode Conditioning and Maintenance .. 17 Temperature-Resistance Correlation for HANNA pH Sensitive Glass .................... 21 Installation Procedure and Examples ...... 23 Accessories .............................................. 26 Warranty .................................................. 32 CE Declaration of Conformity ................. 33 ISO 9000 Certified Company since 1992 PRELIMINARY EXAMINATION Remove the instrument from the packing material and examine it carefully to make sure that no damage has occurred during shipping. If there is any noticeable damage, notify your Dealer. Note: Save all packing material until you are sure that the instrument functions correctly. All defective items must be returned in the original packing material together with the supplied accessories. GENERAL DESCRIPTION HI 8614 - HI 8614L (pH) and HI 8615 HI 8615L (ORP) are 2-wire water-resistant transmitters designed specially for long distance measurement of pH or ORP for use in industrial applications. Two versions are available: the standard HI 8614 or HI 8615 and HI 8614L or HI 8615L with an LCD. The LCD versions allow easy verification and monitoring of measured values and are easier to calibrate and maintain. The pH or ORP signal is transmitted in a 2wire current loop in the range of 4 to 20 mA. HI 8614 and HI 8614L can be connected to Hanna process instruments HI 8510T, HI 8710T or HI 8711T, recorders, computers or any data monitoring device that accepts 4 to 20 mA input. HI 8615 and HI 8615L can be connected to Hanna meters HI 8512T, HI 8720T or any recorders, computers or data monitor that accepts 4 to 20 mA input. 1 The transmitters use a universal BNC socket for quick and secure connection to any electrode with a BNC connector. For HI 8614 - HI 8614L: temperature compensation is performed by the transmitter's ATC circuitry when measurements are taken with the temperature probe attached (HI 76608, optional); it is also possible to substitute the temperature probe with a fixed resistor if ATC is not required. The input is isolated from the current loop to eliminate problems related to ground loop, low insulation cables, multiple electrode connections, and a common mode voltage of up to 100V ensures true differential readings. A terminal board in the transmitter provides for connection of power supply, pH or ORP electrodes (and temperature probe for HI 8614 & HI 8614L). The unit is enclosed in a protective casing conforming to IP65 standards. 2 SPECIFICATIONS OF HI 8614 & HI 8614L HI8614 RANGE RESOLUTION ACCURACY @20°C/68°F TYPICAL EMC DEVIATION pH mA pH mA pH mA pH mA ---4 to 20 ---0.01 ---±0.02 ---±0.25 ±2.2 mA ±0.5 mA HI8614L 0.00 to 14.00 4 to 20 0.01 0.01 ±0.02 ±0.02 ±0.2 ±0.25 CALIBRATION Offset: Slope: TEMPERATURE COMPENSATION INPUT IMPEDANCE OUTPUT INSTALLATION CATEGORY POWER LOAD PROTECTION ENVIRONMENT TEMP. RH DIMENSIONS WEIGHT ±2.2 mA/±2 pH ±0.5 mA 86 to 116% Fixed/automatic 0 to 100°C (32 to 212°F) with HI76608 temp. probe (optional) 1012 ohm 4 to 20 mA isolated II without LCD: 18 to 30VDC with LCD 20 to 36VDC Max. 500 ohms IP 65 0 to 50°C (32 to 122°F) 0-95% (non-condensing) 165 x 110 x 90 mm (L x W x H) (6.5 x 4.3 x 3.5") 1 Kg (2.2 lb.) pH SMITTER pH TRAN H I 8614 H ATOR pH INDIC ITTER SM & TRAN I 8614 L 3 SPECIFICATIONS OF HI8615 & HI8615L HI8615 RANGE RESOLUTION ACCURACY @20°C/68°F TYPICAL EMC DEVIATION mV mA mV mA mV mA mV mA ---4 to 20 ---0.01 ---±0.02 ---±0.25 ±0.8 mA ±0.8 mA HI8615L 0 to ±1000 4 to 20 1 0.01 ±5 ±0.02 ±15 ±0.25 ±0.8 mA/±100mV ±0.8 mA 90 to 110% 1012 ohm CALIBRATION Offset: Slope: INPUT IMPEDANCE OUTPUT INSTALLATION CATEGORY POWER LOAD PROTECTION ENVIRONMENT TEMP. RH DIMENSIONS WEIGHT 4 to 20 mA isolated II without LCD: 18 to 30VDC with LCD 20 to 36VDC Max. 500 ohms IP 65 0 to 50°C (32 to 122°F) 0-95% (non-condensing) 165 x 110 x 90 mm (L x W x H) (6.5 x 4.3 x 3.5") 1 Kg (2.2 lb.) mV HI 8615 SMITTER ORP TRAN HI 8615 TER ANSMIT ORP TR 4 TERMINAL BOARD CONNECTIONS Remove the 4 screws and take the top cover off. There are three cable glands on the cover of the transmitter: two smaller ones and a large one. The large cable gland with the split in the rubber is for the electrode. ELECTRODE CABLE GLAND WIRE CABLE GLANDS Connect the positive supply to the strip terminal "+VE LOOP" and the negative supply to the terminal "-VE LOOP" of the transmitter terminal block. SLOPE ADJUSTMENT OFFSET ADJUSTMENT TEMP. PROBE -VE LOOP +VE LOOP INPUT 5 The wire between the transmitter and the recorder/indicator/controller should be a PVC insulated two wire with a wire diameter of at least 0.7 mm. This wire is fed through one of the smaller cable glands. The maximum distance between the power supply and the amplifier is 300 m (1000'). It is not necessary to use shielded cable. The transmitter is protected against inversion of supply voltage. Electrode connection: connect the BNC of the cable to the BNC socket on the transmitter. For HI 8614 & HI 8614L only: for automatic temperature compensation, connect the 2 terminals of the temperature probe (HI 76608, optional) to "TEMP. PROBE" terminals. If automatic temperature compensation is not required, short the "TEMP. PROBE" terminals with a resistance according to the external temperature: TEMP. PROBE +VE LOOP -VE LOOP INPUT TEMP. PROBE +VE LOOP -VE LOOP INPUT TEMP. PROBE +VE LOOP -VE LOOP INPUT Temperature (°C) Resistance (Ohms) 0 1634 10 1774 20 1922 30 2078 40 2242 50 2412 60 2590 A 2 kohm resistor is factory mounted for 25°C temperature compensation. 6 pH CALIBRATION WITH AUTOMATIC TEMPERATURE COMPENSATION (HI 8614 & HI 8614L) Initial preparation: · Connect the pH electrode to the BNC socket. · Connect the temperature probe to the transmitter. TEMP. PROBE +VE LOOP -VE LOOP INPUT Pour small quantities of pH 7.01 and pH 4.01 solution into two clean beakers. 04 70 HI HI 7004 HI 7007 For accurate calibration use two beakers for each buffer solution, the first one for rinsing the electrode, the second one for calibration. In this way contamination of the buffers is minimized. To get accurate readings, use pH 7.01 and pH 4.01 if you are going to measure acid samples or pH 7.01 and pH 10.01 for alkaline measurements. RINSE CALIBRATION HI 7007 HI 7007 Note: with HI8614L the instruments display can be used during calibration without the need to connect the ammeter and the reading is directly expressed in pH units. SLOPE ADJUSTMENT OFFSET ADJUSTMENT 7 Procedure: · Disconnect the +ve supply cable from "+VE LOOP" terminal and connect a 20mA f.s. ammeter between the +ve cable and "+VE LOOP" terminal. · Remove the protective cap from the electrode, rinse it with some pH 7.01 solution or immerse it in the pH 7 rinse solution, then immerse the pH electrode and temperature probe into pH 7.01 calibration buffer solution; shake briefly and wait for the reading to stabilize. Note: the tip of the electrode should be submerged approximately 4 cm (1½") into the solution. The temperature probe should be located as close to the pH electrode as possible. HI 7007 4 cm 1½" · Adjust the offset trimmer until the ammeter reads 12mA or the display shows "7.01" (HI 8614L only) if the temperature of the buffer is at 25°C. SLOPE ADJUSTMENT OFFSET ADJUSTMENT mA 8 For other buffer temperatures, refer to page 11 for the appropriate mA / pH reading. · Rinse the electrode with tap water or distilled water and a small amount of pH 4.01 or 10.01 buffer solution or immerse it in the pH 4 rinse solution (2nd calibration point). Dip the HI 7004 electrode and the temperature probe into pH 4.01 (or 10.01) calibration buffer solution, shake briefly and wait for a few minutes for reading to stabilize. Adjust the slope trimmer until the ammeter reads 8.58 mA or the display shows "4.01" at 25°C. For other buffer temperatures, refer to page 11 for the appropriate mA / pH reading (HI 8614L). · SLOPE ADJUSTMENT OFFSET ADJUSTMENT mA If you are using pH 10.01 buffer solution adjust the slope trimmer until the ammeter read 15.43 mA at 25°C (77°F) or the value indicated at page 11. mA FOR HI 8614L ONLY: The Display Module is factory calibrated, so that the LCD display results are referred to the 4-20 mA loop current (e.g. LCD displays 0.00 pH when loop current is 4.00 mA and displays 14.00 pH when current is 20.00 mA). 9 Under normal application, adjustment on this module may not be necessary. If routine check is required, the following procedures shall be performed. · Follow the procedure at page 7 to perform calibration on the transmitter module (using a ammeter). Simulate a 4.00 mA loop current for the transmitter (i.e. pH 0.00 as Electrode input) and check for display reading. Simulate a 20.00 mA loop current for the transmitter (i.e. pH 14.00 as Electrode input) and check for display reading. · · Note: when the instrument is used in conjunction with the Hanna indicator HI 8510T or controllers HI 8710T, HI 8711T, the calibration can also be performed on the indicator/controller. In this case slight calibration adjustment can be made on the indicator/ controller even if the whole system calibration is advised, always starting from the transmitter. 10 pH CALIBRATION WITH FIXED TEMPERATURE COMPENSATION (HI 8614 & HI 8614L only) · Take the temperature of the buffer solutions using a Checktemp or a thermometer with a resolution of at least 1°. Connect the appropriate resistor to the "TEMP. PROBE" terminals (see page 6) depending on the temperature of the calibration solution. TEMP. PROBE °C · +VE LOOP -VE LOOP INPUT · Follow the procedure as outlined in the calibration with automatic temperature compensation and use the thermometer reading to adjust the trimmer until the ammeter reads the value according to the following table. 4.01 pH Buffer 7.01 pH Buffer 10.01 pH Buffer Temperature °C 0 5 10 15 20 25 30 35 40 45 50 55 60 °F 32 41 50 59 68 77 86 95 104 113 122 131 140 pH 4.01 4.00 4.00 4.00 4.00 4.01 4.02 4.03 4.04 4.05 4.06 4.07 4.09 mA 8.576 8.565 8.565 8.565 8.565 8.576 8.587 8.599 8.610 8.622 8.633 8.645 8.667 pH 7.13 7.10 7.07 7.04 7.03 7.01 7.00 6.99 6.98 6.98 6.98 6.98 6.98 mA 12.137 12.103 12.069 12.034 12.023 12.000 11.989 11.977 11.966 11.966 11.966 11.966 11.966 pH 10.32 10.24 10.18 10.12 10.06 10.01 9.96 9.92 9.88 9.85 9.82 9.79 9.77 mA 15.789 15.697 15.629 15.560 15.491 15.434 15.377 15.331 15.285 15.251 15.217 15.182 15.159 11 ORP CALIBRATION (HI8615 & HI8615L) Initial preparation: Disconnect the +ve supply cable from the "+VE LOOP" terminal and connect a 20 mA f.s. ammeter between the +ve cable and the "+VE LOOP" terminal. With HI 8615L the instrument display can be used during calibration without the need to connect the ammeter. In this case the values are directly expressed in mV units. Pour a small quantity of HI 7020 ORP solution into a beaker. Procedure: · Connect the shorting BNC connector to the ORP transmitter. · Adjust the OFFSET ADJUSTMENT trimmer on the module for a display of 12 mA on the ammeter or 0 mV on the instrument display (HI 8615L only). This sets the zero point for the transmitter. +VE LOOP -VE LOOP INPUT 20 70 HI SLOPE ADJUSTMENT OFFSET ADJUSTMENT mA · Connect the ORP electrode to the transmitter and immerse the tip of the electrode into a beaker of HI 7020 ORP calibration solution, and check that the ammeter reading lies between 13.6 and 14.2 mA or the instrument reading is between 200 and 275 mV at 25°C (HI 8615L). +VE LOOP -VE LOOP mA INPUT HI 7020 12 · If the reading lies outside this range, adjust the slope adjustment trimmer on the transmitter for a reading just within this range. The unit is now calibrated. SLOPE ADJUSTMENT OFFSET ADJUSTMENT A complete calibration of the transmitter module is advised periodically. This ca ...