User manual HANNA INSTRUMENTS HI 943500

[. . . ] Instruction Manual HI 8931 · HI 8936 Series HI 943500 Series Conductivity Process Controllers and Transmitters 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 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. [. . . ] Connect the other 2 wires to the "+20 V" and "COM" terminals, while paying attention to the polarity. · Connect the 3-wire power cable to the 4-screw terminal strip according to the voltage level as indicated, and pay particular attention to the correct live, earth and neutral terminal connections. 24 25 · 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. When screwing the joints, take care not to overtighten as excessive pressures can damage the probe. · It is recommended to install the HI 7635 vertically. This is to ensure that trapped air bubbles or turbulent flows cause minimal interference to the measurement system. · The HI 7638 process conductivity probe is also supplied with a 3 m (10') cable. The 6-core cable of this probe is connected to the HI 8936 process conductivity transmitter as shown. The DIN connector has to be removed when this probe is used in conjunction with an HI 8936 transmitter. See page 24 for the proper connection scheme. FOR HI 943500 ONLY Ensure that the HI 7638 conductivity probe is connected to the meter securely by aligning the pins with the socket, pushing the plug in and tightening the threaded ring. · The HI 7635 conductivity probe is supplied with a 3 m (10') cable. The 6-core cable of the probe is connected to the HI 8936 transmitter as shown. See page 24 for the proper connection scheme. 26 27 OPERATING INFORMATION 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). Below Setpoint Control Operation Short the "SET SELECT" and "COM" connectors with a jumper wire. The set contact relay will close if the measured value is lower than the setpoint value, and the "SET ON" LED will light up. COM SET SELECT SET POINT To set the working point of the controller, press the SET key. The display will indicate the current set value. ALARM Press the "AL" key and the display will show the set tolerance for the alarm. Use a small screwdriver to adjust the COARSE and FINE trimmers until the desired value is displayed. Above Setpoint Control Operation Leave the "SET SELECT" and "COM" connectors open. The set contacts relay will close if the measured value is higher than the setpoint value, and the "SET ON" LED will light up. COM SET SELECT Use a small screwdriver to adjust the "AL" trimmer until the desired tolerance is displayed. For example, if the set value is 200 S/cm and a Alarm of 50 S/cm is set, an alarm will be activated every time the measured value is higher than 250 S/cm or lower than 150 S/cm. When an alarm occurs, the "ALARM" LED lights up. 28 29 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. CALIBRATION PROCEDURE OF HI 8931 & HI 8936 WITH HI 7635 Material needed: · HI 7635 conductivity probe · HI 8931 conductivity controller · HI 8936 conductivity transmitter · A 20 mA f. s. ammeter (for transmitters without LCD) · A reference conductivity meter with automatic temperature compensation accurately calibrated (e. g. HI 8733). 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. PROCEDURE · Connect the HI 7635 probe to the H I8936 transmitter (see page 24 for details). [. . . ] 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. 40 If you are calibrating HI 8931A or HI 943500A using HI 7030 (12. 88 mS/cm @25°C) standard solution, turn the SLOPE trimmer to display "12. 88 mS", with a reference temperature of 25°C (77°F), while for a reference temperature of 20°C (68°F), the SLOPE trimmer should be adjusted to display "11. 67 mS". 41 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 S 100. 0 S ±35. 0 mS ±3. 50 mS ±350 S ±35. 0 S Press the "MEASURE" key before proceeding the following tests. A) Test Offset Press the "TEST OFFSET" 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 0. 0 mS 0. 00 mS 000 S 0. 0 S ±1. 0 mS ±0. 10 mS ±100 S ±1. 0 S Note: The reading obtained by these functions will vary if the OFFSET and SLOPE trimmers on the front panel are adjusted. 42 43 INSTALLATION EXAMPLES Some typical installation setups are shown in the following examples: Example #3 Example #1 Example #4 Example #2 Example #5 44 45 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. [. . . ]