Instruction Manual HI 8931 • HI 8936 Series HI 943500 Series Conductivity Process Controllers and Transmitters w w w . h a n n a i n s t .
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 correct use of the instruments, as well as a precise idea of thier versatility in a wide range of applications. If you need additional technical information, do not hesitate to e-mail us at tech@hannainst.com directives.
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. Each model is supplied complete with: • Mounting brackets (not for HI 8936 series) • Transparent splsh-proof cover (not for HI 8936 series) • Instruction manual Note: Save all packing materials until you are sure that the instrument functions correctly.
REAR PANEL OF HI 8931 SERIES FUNCTIONAL DESCRIPTION HI 8931 & HI 943500 KEYPAD MEASURE To read measurements and enable diagnostic tests ΔAL To display set tolerance of the alarm SET To set working point TEST SLOPE Diagnostic function TESTOFFSET Diagnostic function When a key is pressed, the corresponding LED lights up to indicate that the function is active.
REAR PANEL OF HI 943500 SERIES MECHANICAL DIMENSIONS OF HI 8931 AND HI 943500 Front view of the panel-mounted unit 141mm 5.55" 144mm 5.67" 69mm 2.71" 72mm 2.83" These dimensions show the cutout size for the installation. Side view of the panel-mounted unit 1. 2. 3. 4. 5. 6. 7.
FUNCTIONAL DESCRIPTION HI 8936 SIDE VIEW OF HI 8936 SERIES HI 8936A HI 8936B HI 8936C HI 8936D HI 8936AL HI 8936BL HI 8936CL HI 8936DL 1. 2. 3. 4. 1. Top cover 2.
MECHANICAL DIMENSIONS OF HI 8936A, HI8936B, HI 8936C, HI 8936D CONDUCTIVITY PROBES HI 7635 In-line Conductivity Probe HI 8614 165mm 6.50" 90mm 3.54" 4 x 4.3mm 4 x 0.17" 100mm 3.94" 110mm 4.33" 155mm 6.10" HI 7635 is a one piece, molded conductivity probe with pipe threads (1" NPT) at both ends. This allows the probe to attach to an in-line system, and to be used in conjunction with the HI 8936 conductivity transmitter. The HI 7635 uses a 4-ring potentiometric measuring method.
SPECIFICATIONS HI 8931 & HI 943500 HI7638 Tank Conductivity Probe HI 7638 conductivity probe combines the proven 4-ring potentiometric method of measuring conductivity with the platinum sensor and stainless steel external thread. This method incorporates a series of four platinum rings into the probe shaft and is highly accurate requiring very little maintenance. The removable plastic cover resists the harmful effect of most chemicals and can be unscrewed for quick and simple maintenance.
CONNECTIONS SPECIFICATIONS HI 8936 REAR CONNECTIONS FOR HI 8931 Range HI 8936 A/AL HI 8936 B/BL HI 8936 C/CL HI 8936 D/DL Accuracy (@20°C/68°F) Typical EMC Deviation Conductivity Probe Calibration Temperature Compensation Output 0.0 to 199.9 mS/cm 0.00 to 19.99 mS/cm 0 to 1999 μS/cm 0.0 to 199.9 μS/cm ±2% of Full Scale excluding probe error ±2% of Full Scale ±0.
TERMINAL BOARD CONNECTIONS FOR H8936 • Set Select These contacts permit the activation of a Set Contact relay when the measured value is lower (connected terminals) or higher (open terminals) than the user's set value. See also page 28. • Remove the 4 screws and the top cover of the HI 8936 conductivity transmitter to obtain access to the terminal board connections. • +4-20 mA These are the output terminals for connection to a recorder or other control equipment.
• Probe Connection The 4-core cable has to be connected to the transmitter according to the label instructions on the 4-terminal strip. The regulated D.C. supply required for the proper operation of the transmitter is "+20 V", labeled "+20 V" and "COM". The current (mA) output terminals are labeled "4-20 mA" and "COM". The conductivity probe is supplied with a 3 m (10'), 6 core cable.
REAR CONNECTIONS FOR HI 943500 • Power Connection Terminals 4-screw-terminal-strip for connection to a 3-wire power cable according to the indicated voltage (115 or 230 V). • Set Dosing pumps or other control equipment may be connected to the "SET" (Max. 2A, 240 V) terminals. These contacts act only as a "dry" switch allowing electrical continuity, not as a power supply. • Alarm Contacts During normal operation these terminals remain closed.
CONDUCTIVITY PROBE CONNECTIONS OPERATIONAL GUIDE The connections for HI 7635 are color coded for easy installation and are as follows: INITIAL PREPARATION & INSTALLATION Material needed: HI 7635 cable HI 8936 transmitter Black or Grey Red or Pink Brown or Orange Blue White Green or Yellow NTC SENSOR probe pin 1 probe pin 2 probe pin 3 probe pin 4 The connections for HI 7638 are as follows: HI 7638 #1 #2 #3 #4 #5 #6 HI8936 transmitter probe pin 1 probe pin 2 probe pin 3 probe pin 4 NTC SENSOR conn
• The HI 8936 transmitter may be wall-mounted at any convenient location close to the measurement site. To minimize thermal drifts due to extreme temperature fluctuations, particularly for outdoors measurements, it is recommended to protect the transmitter inside a casing. • For the installation of the HI 7635 conductivity probe, use rubber seals between the probe and the pipe or elbow joints. A pipe sealant is also recommended to ensure a leak free joint.
OPERATING INFORMATION Below Setpoint Control Operation All parameters are set through the front panel keys and trimmers. When any key is pressed, the corresponding LED lights up to indicate that the function is active. Make sure that the conductivity meter, transmitter and probe are calibrated before taking measurements (see pages 31, 35 and 39 for calibration procedures). Short the "SET SELECT" and "COM" connectors with a jumper wire.
The alarm contacts of HI 8931 and HI 943500 remain closed during normal operation. If the measured conductivity level is not within the tolerance of the set value, the alarm contact will be open. TAKING MEASUREMENTS WITH HI 8931 AND HI 943500 After setting the working point and alarm value, press the "MEASURE" key. The actual conductivity value of the test solution will be displayed.
• Ensure that the HI 7635 conductivity probe is dry. • When the power is on, the ammeter should read "4.0 mA". The HI 8936 transmitter with LCD should display "0". • The reading will be converted to mA by the following formula: mA = K (measured value x 16/2000) + 4 K = conversion factor depending on the model Model HI 8936 A/AL HI 8936 B/BL HI 8936 C/CL HI 8936 D/DL • If not, adjust the transmitter OFFSET trimmer to read "4 mA" or "0" on the HI 8936 LCD. • The HI 8931 controller should display "0" value.
• The calibration is now complete and the instrument is ready for use. All subsequent measurements will be compensated to 25°C (77°F). • If the instrument will not calibrate, refer to the "Probe Maintenance and Cleaning" section on page 46. • If the HI 8936 is not used in conjunction with the HI 8931 controller, connect the transmitter to an external power supply (see page 20), to the HI 7635 conductivity probe (see page 24) and to an ammeter (see page 20).
0 703 • Pour at least 8 cm (3¼") of conductivity solution into a plastic beaker. HI • Leave the HI 7638 conductivity probe in air (dry probe). 8 cm (3¼") • When the power is on, the ammeter should read "4.0 mA" or the HI 8936 transmitter with LCD should display "0". • Immerse the probe into the conductivity solution. The holes on the sleeve must be completely submerged in the solution.
• FOR HI 8931 When the reading stabilizes, turn the SLOPE trimmer on the front of the HI 8931 until the LCD reading is the same as the calibration solution at 25°C (77°F), i.e. "80.0 mS" using HI 7034 with HI 8931A "12.88 mS" using HI 7030 with HI 8931B "1413 μS" using HI 7031 with HI 8931C "84.
• If the LCD does not show "0", adjust the OFFSET trimmer. CONDUCTIVITY VERSUS TEMPERATURE CHART HI 703 0 °C • Pour at least 8 cm (3¼") of conductivity solution into a plastic beaker. 8 cm (3¼") • Immerse the probe into the conductivity solution, while paying attention that the holes on the sleeve are completely submerged. • Tap the probe repeatedly on the bottom of the beaker and stir it to ensure that no air bubbles remain trapped inside the sleeve.
DIAGNOSTIC TESTS The HI 8931 and HI 943500 controllers are designed with built-in diagnostic functions to enable the user to check and troubleshoot the instrument. The checks performed are through the front panel keys and can be used to isolate the cause of malfunction. B) Test Slope Press the "TEST SLOPE" key and the display should indicate the following values: HI 8931/HI 943500A HI 8931/HI 943500B HI 8931/HI 943500C HI 8931/HI 943500D 100.0 mS 10.00 mS 1000 μS 100.0 μS ±35.0 mS ±3.50 mS ±350 μS ±35.
INSTALLATION EXAMPLES Example #3 Some typical installation setups are shown in the following examples: Example #1 Example #4 Example #2 Example #5 44 45
ACCESSORIES PROBE MAINTENANCE & CLEANING The probe can be compensated for normal contamination by a process of re-calibration. It is recommended to remove the probe from its installation regularly for maintenance. For HI 7635 only: Deposits on the conductivity probe can be removed by immersing the probe in 0.1 N hydrochloric acid for about 30 minutes. Heavier deposits may demand longer immersion periods. Rinse the probe thoroughly with water prior to the reinstallation.
WARRANTY CONDUCTIVITY PROBES HI 7635 In-line conductivity probe with 3 m (10') cable (for HI 8936 only) All HANNA instruments® meters are warranted for two years against defects in workmanship and materials when used for their intended purpose and maintained according to instructions. The probes are warranted for a period of six months. This warranty is limited to repair or replacement free of charge. 142mm 5.
CE DECLARATION OF CONFORMITY Recommendations for Users Before using these products, make sure that they are entirely suitable for the environment in which they are used. Operation of these instruments in residential area could cause unacceptable interferences to radio and TV equipments, requiring the operator to take all necessary steps to correct interferences. The trimmers are sensitive to electrostatic discharges. It is recommended to use antistatic screwdrivers.
SALES & TECHNICAL SERVICE CONTACTS Australia: Tel. (03) 9769.0666 • Fax (03) 9769.0699 China: Tel. (10) 88570068 • Fax (10) 88570060 Egypt: Tel. & Fax (02) 2758.683 Germany: Tel. (07851) 9129-0 • Fax (07851) 9129-99 Greece: Tel. (210) 823.5192 • Fax (210) 884.0210 Indonesia: Tel. (21) 4584.2941 • Fax (21) 4584.2942 Japan: Tel. (03) 3258.9565 • Fax (03) 3258.9567 Korea: Tel. (02) 2278.5147 • Fax (02) 2264.1729 Malaysia: Tel. (603) 5638.9940 • Fax (603) 5638.9829 Singapore: Tel. 6296.7118 • Fax 6291.
