User manual HANNA INSTRUMENTS HI 8410

[. . . ] 12 Taking Measurements with HI 8410 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Calibration Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Diagnostic Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 LED Indication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] Connect the wires according with the indicated color. · Set Contacts Dosing pumps or other control equipment may be connected to the "SET" (Max. These contacts act only as a "dry" switch allowing electrical continuity, not as a power supply. · Recorder Output (terminals 1, 2, 3) These contacts are used for connection to a recorder output. The output can be 0-20 mA or 4-20 mA and is proportional to the measured Dissolved Oxygen values. Connect the "+" wire from the recorder to terminal 1 on the instrument and the other wire (common) to terminal 2 for 4-20 mA recorder output or terminal 3 for 0-20 mA recorder output. In order to avoid malfunction leave unconnected the unused terminal. 10 · Alarm Contacts (terminals 5, 6) During normal operation these terminals remain closed. level is not within the tolerance of the set value, the alarm contact is open. See also page 15. · Overtime dosing When enabled this feature ensures that overdosage is avoided. If the dosage relay is active more than the selected period an alarm condition is activated and the dosage relay is deactivated. To leave the overtime dosage alarm status change the position of the OFF/AUTO/ON switch to OFF and then to AUTO again. To set the overtime dosing period rotate the overtime knob to the proper position. To disable the overtime dosage feature make a short with a jumper wire between the terminals of the proper connectors. (see picture, terminals 1, 2) · Hysteresis knob Put the hysteresis knob in the desired position. The dosage will be active according to the DO reading, set point value and the hysteresis set value. DOSING MODE SELECTION The DOSAGE switch and the corresponding right side LED on the front panel are used to select and indicate the dosing mode. OFF mode The dosage is disabled. The corresponding DOSAGE MODE LED blinks. 11 AUTO mode The dosage is activated and deactivated according with the selected setpoint. Be sure that the DOSAGE switch is in AUTO position when the meter is in normal operating mode. ON mode The dosage is always activated. The corresponding DOSAGE MODE LED blinks. OPERATIONAL GUIDE INITIAL PREPARATION & INSTALLATION Material needed: · a 3-wire power cable to connect HI 8410 Ensure the controller has been calibrated. reading can be displayed in % air saturation or in ppm (mg/L) according to the range selection switch. For accurate dissolved oxygen measurements a water flow of at least 5-7 cm/sec is required. In this way a constant replenishment of the oxygen-depleted membrane surface is ensured. Note: For some particular applications, such as fish farming, the membrane can be sterilized with stabilized iodine (20 to 50 ppm), typically used for this purpose. Note: For use in harsh environments, it is recommended to protect the membrane with the optional HI 76410-0 sleeve. The response time will slightly slow down. 12 Ensure that the HI 76410 DO probe is connected to the meter according with the colors indicated on the mask. OPERATING INFORMATION All parameters are set through the front panel keys and trimmers. [. . . ] 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. Unplug the instrument from the power supply before replacing the fuse. External cables to be connected to the rear panel should end with cable lugs. To maintain the EMC performance of this equipment, use the proper cables. [. . . ]