Global Water 800-876-1172 • globalw.com Global Water Instrumentation, Inc.
Global Water 800-876-1172 • globalw.com Table of Contents I) II) III) IV) V) VI) VII) VIII) IX) X) XI) Inspection................................................................................................................ 3 General Introduction ............................................................................................... 3 Mounting Procedure................................................................................................ 3 Using The Global Water Model 6308DT ..........
Global Water 800-876-1172 • globalw.com I) Inspection a) Your 6308DT MICROCOMPUTER BASED DO/ TEMPERATURE CONTROLLER unit was carefully inspected and certified by our Quality Assurance Team before shipping. If any damage has occurred during shipping, please notify Global Water Instrumentation, Inc. and file a claim with the carrier involved.
Global Water 800-876-1172 • globalw.com Warning: If the equipment is used in a manner not specified by the manufacturer, the protection provided by the equipment may be impaired. d) Cleaning the instrument : 1. Be sure to remove the power before attempting to clean the meter. 2. Use a lint free cloth and clean water or neutral detergent. 3. Wipe the outer surface of the instrument only. 4. Wipe dry the instrument before power again.
Global Water 800-876-1172 • globalw.com III) Using the Global Water Model 6308DT a) Front Panel 1. The [MODE/-] key. (a) In Normal mode, this key will change the DO display to DO % or DO ppm. (b) In Calibration / Setting mode, this key will move to the next digit of the current active parameter. (c) In Calibration/ Setting mode, pressing this key for 2 seconds will move you back to the previous parameter. 2. The [CAL/VIEW] key.
Global Water 800-876-1172 • globalw.com 3. The [ ] UP key. During Calibration/Setting mode, this key will increment the current blinking digit of the active parameter. 4. The [ ] DOWN key. During Calibration/Setting mode, this key will decrement the blinking digit of the active parameter. 5. The [ ] ENTER key. During Calibration/Setting mode, this key will save the current modified parameter and move to the next parameter on the page.
Global Water 800-876-1172 • globalw.com 4. H1 annunciator - this is the status of DO Relay 1. If this is displayed, then the relay is ON. 5. H2 annunciator - this is the status of DO Relay 2. If this is displayed, then the relay is ON. 6. L3 annunciator - this is the status of DO Relay 3, if this is displayed the Relay is ON. 7. L4 annunciator - this is the status of DO Relay 4. If this is displayed, then the Relay is ON. 8.
Global Water 800-876-1172 • globalw.com 1. Connect the AC line to the rear of the instrument. The model 6308PT can be used with 115VAC or 230VAC 50/60 Hz. Power consumption is 6-watt. Make sure the EARTH connector is connected to the earth lead of the AC power line. 2. Connect the proper load to the output relays. Make sure that the load does not exceed the relay rating, 5 Amp at 115VAC and 2.5 Amp at 230 VAC. 3. Set the proper load to the 4-20mA output connector.
Global Water 800-876-1172 • globalw.com IV) Model 6308DT Modes a) Main Display Mode Turning ON the unit will always start in main display mode. This instrument is designed to provide 3 distinct measurements: 1. Temperature - current temperature of the solution that is always displayed. 2. Dissolved Oxygen % - a measurement of oxygen in percent saturation. 3. Dissolved Oxygen ppm - a measurement of oxygen in ppm.
Global Water 800-876-1172 • globalw.com You can change any blinking options or digit by pressing the [ ] or [ ] keys. For options in digit format you need to press the [ MODE/-] key to move to the next digit. If you are satisfied with the selection you made you need to press the [ ] ENTER key to save the changes and move to the next option. If you do not need to change the current blinking option just press the [ ] ENTER key to move to the next selection.
Global Water 800-876-1172 • globalw.com CAUTION: IF THE UNIT IS NOT LOCKED THEN EVERY TIME THE USER ENTERS THE CALIBRATION/SETTING MODE THE RELAYS AND ANALOG OUT WILL BE FROZEN. d) User Setting page. You will only see this page if the unit is not password locked. This page is just a warning, telling you that all relays are frozen, and that you can calibrate and change the settings.
Global Water 800-876-1172 • globalw.com accurately, you will need the following information: (a) The approximate pressure (in mbar) of the region in which you plan to take your dissolved oxygen measurements. (b) The approximate salinity of the water you will be analyzing. Fresh water has a salinity of approximately zero. Sea water has a salinity of approximately 35 parts per thousand (ppt). f) Calibration Procedures 1. Place 5-6 drops of distilled water into the sponge inside the calibration bottle.
Global Water 800-876-1172 • globalw.com hysteresis mode. (See chapter VI. CONTROLLING THE ] and [ ] keys to change the blinking digit, RELAYS.) Use [ use the [MODE/-] key to select another digit and the [ ] key to save the new value. (b) HI RELAY 2 - The action for this relay is fixed to HIGH. In HIaction, the relay will turn ON if the DO is greater or equal to RELAY2 value, which is modified by the hysteresis value and hysteresis mode. (See chapter VI. CONTROLLING THE RELAYS.
Global Water 800-876-1172 • globalw.com (b) 2. 20mA OUT - this value will be used in conjunction with the 4 mA value to plot the output. (See chapter VII. 4-20 mA OUTPUT.) 8. TEMP. CONTROL SETTING (a) RELAY 5 - the temperature has only one relay to control you need to set what action it will use, HIGH or LOW action. .
Global Water 800-876-1172 • globalw.com (c) HYSTERESIS (mode) - this is the hysteresis mode for TEMPERATURE alarm. You can choose "CENTER" or "EDGE." (See chapter VI. CONTROLLING THE RELAYS.) (d) HYSTERESIS (value) - this is the actual value of the hysteresis. You can change this value from 0.0 to 19. 9°C. (See chapter VI. CONTROLLING THE RELAYS.) (e) RS 485 ID - this is the unique ID/Address for the unit.
Global Water 800-876-1172 • globalw.com If the relay action is set to HIGH and the hysteresis mode is CENTER, the relay will turn ON at [(RELAY SETPOINT) + (0.5 * hysteresis value)], and will turn OFF at [(RELAY SET POINT) - (0.5 * hysteresis value)]. If the relay action is set to HIGH and the hysteresis mode is EDGE, the relay will turn ON at (RELAY SET POINT), and will turn OFF at [(RELAY SET POINT) (hysteresis value)].
Global Water 800-876-1172 • globalw.com d) DO Relays There are four independent Alarm channels for DO display. The hysteresis mode (center or edge) and hysteresis value will be used by four DO relays. The actions of the DO relays are dependent on set point, relay action type (HIGH or LOW), hysteresis mode (Center or Edge), hysteresis value, and the current DO display. (See figure above.) e) Temperature Relay 1.
Global Water 800-876-1172 • globalw.com VI) 4 - 20 mA Output a) Isolation Voltage The maximum isolation voltage of the 4-20 mA output is 500 VDC. The voltage differential between the 4-20 mA output and the load should not exceed 500 VDC. b) Output Load The maximum load is 500Ω. Output current inaccuracies may occur for load impedance in excess 500Ω. c) DO Linear Output 1. The analog output will produce a linear analog output if the user selects this option.
Global Water 800-876-1172 • globalw.com VII) Rs485 Interface Operation a) Introduction 1. This section assumes you are familiar with the basics of data communication, the RS485 interface, a rudimentary knowledge, and a copy of the more popular Windows® $ 9X computer languages capable of using a PC RS485 card or RS232-RS485 converter (third party vendor) module. A simple program must be written in order to send your command and receive data from the meter. A sample source program in Visual Basic® $ 6.
Global Water 800-876-1172 • globalw.com During power-on RAM : BAD [Return for service. (See IX. TROUBLESHOOTING) Unit has failed its RAM test. [Turn instrument OFF and back to ON again.] [Return for service. (See IX. TROUBLESHOOTING)] Other issues a) Call us for tech support: 800-876-1172 or 916-638-3429 (many problems can be solved over the phone). Fax: 916-638-3270 or Email: globalw@globalw.com.
Global Water 800-876-1172 • globalw.com b) Temperature Range -10.0 to 120.0 °C Resolution 0.1 °C c) DO Salinity compensation Pressure compensation Temperature compensation d) Temperature Temperature sensor Accuracy ±0.1 °C 0.0 to 40.0 ppt (manual) 640 to 1100 mBar (manual) -10.0 to 50.0 °C (automatic) Thermistor, 2252. at 25°C X) Warranty a) Global Water Instrumentation, Inc.
