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Hach sension8 Manual

Hach sension8 Manual

Dissolved oxygen meter
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Cat. No. 54550-18
Dissolved Oxygen Meter
© Hach Company, 1999. All rights reserved. Printed in the U.S.A.
ap/dk 9/99 1ed

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  • Page 1 Cat. No. 54550-18 Dissolved Oxygen Meter © Hach Company, 1999. All rights reserved. Printed in the U.S.A. ap/dk 9/99 1ed...
  • Page 2 TRADEMARKS OF HACH COMPANY ® AccuGrow H OU™ “Pond in Pillow”™ ® ® AccuVac Hach Logo PourRite™ ® ® AccuVer Hach One PrepTab™ ® ACS-Plus™ Hach Oval ProNetic™ AgriTrak™ Hach.com™ Pump Colorimeter™ ® ® AluVer HachLink™ QuanTab AmVer™ Hachology™ Rapid Liquid™...

  • Page 3: Table Of Contents

    TABLE OF CONTENTS SAFETY PRECAUTIONS ....................... 7 SPECIFICATIONS........................9 OPERATION ........................11 SECTION 1 INTRODUCTION ..................13 1.1 Unpacking the Instrument ....................14 1.1.1 Standard Accessories ....................14 1.1.2 Optional Accessories ....................14 1.2 Keypad Description ......................14 1.3 Display Fields and Icons ....................16 1.4 Maintenance ........................
  • Page 4 TABLE OF CONTENTS, continued 3.3.6 Calibrating a Sample to Read 100% Saturation ............37 3.3.7 Calibration Review....................38 3.4 Measuring Dissolved Oxygen................... 39 3.4.1 General Probe Operation..................39 3.4.2 Measurement ......................39 3.4.3 Probe Storage ......................40 3.4.4 Maintenance ......................41 3.5 Using the BOD Accessory Kit..................
  • Page 5 TABLE OF CONTENTS, continued SECTION 9 REFERENCE TABLES ................65 9.1 Salinity Correction Factors....................65 9.2 Barometric Pressure and Elevation ................... 66 9.3 Solubility of Oxygen in Water ..................67 9.4 Pressure Conversions......................73 GENERAL INFORMATION ................... 75 REPLACEMENT PARTS ....................... 77 HOW TO ORDER........................

  • Page 7: Safety Precautions

    SAFETY PRECAUTIONS Section 2.2 Power Connection Section 2.3 Printer and Computer Connections Section 6.1 Connecting to Printers/Computers...

  • Page 9: Specifications

    5-pin shielded RS232C circular connector Power Requirements: 6–12 Vdc; use either Hach-supplied 115 or 230V, 50/60 Hz external power supply or a customer-provided supply with 50 mA output, 5.5-mm power plug with a 2.5 mm center post opening Installation Category: II Instrument drift: <...

  • Page 11: Operation

    OPERATION DANGER Handling chemical samples, standards, and reagents can be dangerous. Review the necessary Material Safety Data Sheets and become familiar with all safety procedures before handling any chemicals. DANGER La manipulation des échantillons chimiques, étalons et réactifs peut être dangereuse. Lire les Fiches de Données de Sécurité...

  • Page 13: Section 1 Introduction

    SECTION 1 INTRODUCTION The versatile sens ™8 Dissolved Oxygen Meter, shown in Figure 1, easily measures dissolved oxygen in aqueous solutions. Important features include measurement in % saturation; autocalibration; a 99-point internal datalogging function; and altitude, barometric pressure, and salinity correction. The meter is microprocessor-controlled, has a sealed keypad, and can send data to a printer or computer.

  • Page 14: Unpacking The Instrument

    If any items are missing or damaged, contact Hach Customer Service, Loveland, Colorado. Hach’s toll free phone number for customers within the United States is 800-227-4224. Customers outside the United States should contact their regional Hach office or distributor.
  • Page 15 SECTION 1, continued sens 8 Dissolved Oxygen Meter Keypad Figure 2 Table 1 Keys and Description Description EXIT/POWER Turns the instrument on; turns it off from a Reading mode. ON-OFF key Acts as a No or Cancel key when the question mark icon is illuminated. In Setup mode, backs up one step toward the Reading mode.

  • Page 16: Display Fields And Icons

    SECTION 1, continued Table 1 Keys and Description (Continued) Description READ/ENTER Accepts numerical input. Acts as a “YES” answer when the question mark is flashing. Allows user to edit the setup when the setup number is flashing. Accepts the current Setup option when that option is flashing. Initiates a measurement when the meter has stabilized in the Display Lock Enabled mode.
  • Page 17 SECTION 1, continued Figure 3 sens 8 Display Elements Table 2 Main Display Elements Item No. Description Indicates meter is in Calibration mode. When the is flashing, a calibration is necessary. Indicates meter is in Calibration Review mode. Indicates data is being sent to a printer/computer. Indicates currently displayed, recalled data is being erased.
  • Page 18 SECTION 1, continued Table 2 Main Display Elements (Continued) Item No. Description Main measurement display field. Indicates measurement units (% or mg/L). Indicates the temperature units in use (choice of °C or °F). Displays temperature or month/day portion of the date. Indicates an inactive key has been pressed and that function is not allowed.

  • Page 19: Maintenance

    SECTION 1, continued 1.4 Maintenance The meter is designed to be maintenance-free. If the meter gets dirty, wipe the surface with a damp cloth. Use a cotton-tipped applicator to clean or dry the connectors if they get wet. 1.5 Audible Signals The meter will beep under certain conditions: •...

  • Page 21: Section 2 Instrument Setup

    SECTION 2 INSTRUMENT SETUP 2.1 Instrument Description This sens ™8 Dissolved Oxygen Meter is designed for laboratory use and operates on 115/230 V ac power. The meter measures from 0 to 20 mg/L or percent saturation and the sample temperature. Displayed dissolved oxygen values are corrected for temperature, altitude, barometric pressure, and salinity.

  • Page 22: Printer And Computer Connections

    SECTION 2, continued Printer and Computer Connections The meter can send data to a computer or printer via the 9-pin serial port (see Figure 5). The printer cable and computer cable are different. The printer cable is a 9-pin to 25-pin cable and the computer cable is a 9-pin to 9-pin cable.

  • Page 23: Section 3 Instrument Operation

    SECTION 3 INSTRUMENT OPERATION 3.1 Setup Menu The Dissolved Oxygen Meter allows users to customize the display and ensure accurate results. Access Setup mode by pressing the key located in the lower right hand corner SETUP/CE of the keypad. The SETUP icon and a flashing will appear in the upper right hand corner of the display.

  • Page 24: Selecting Measurement Resolution

    SECTION 3, continued 1. To change the units, access the setup mode by pressing the key. SETUP 2. Press the once. A will begin flashing in the UP ARROW upper right hand corner of the display. 3. Press the key to select °C or °F and press the key.

  • Page 25: Changing The Barometric Pressure

    SECTION 3, continued 3. To change the salinity factor, press the key. The ENTER number pad icon will appear in the lower display. 4. Use the number keys to enter a salinity factor ranging from 0 to 42. Press the key to leave the value unchanged.

  • Page 26: Adjusting The Altitude

    SECTION 3, continued 2. Press the four times. A will begin flashing in the UP ARROW upper right hand corner of the display. The current barometric pressure will be displayed. 3. To change the value press the key. The number pad ENTER icon will appear in the lower display.

  • Page 27: Setting The Time

    SECTION 3, continued Entering the meter altitude When the meter is received from the factory, the default altitude is 0 meters. To change the value: 1. Access the setup mode by pressing the key. SETUP 2. Press the five times. A will begin flashing in the UP ARROW upper right hand corner of the display and the current altitude...

  • Page 28: Setting The Date

    SECTION 3, continued 3.1.8 Setting the Date This setup feature is used to set the date in the instrument. To change the value: 1. Press the key to access the setup mode. SETUP 2. Press the seven times. An will begin flashing in UP ARROW the upper right hand corner of the display and the Date icon will appear.

  • Page 29: Automatic Data Transfer

    SECTION 3, continued 3.1.10 Automatic Data Transfer This setup feature activates the meter’s automatic data transfer (Print) function. The automatic data transfer function automatically sends data through the RS232C port, depending upon the time interval selected. Time intervals are selected from the following options: 10 seconds, 30 seconds, 1 minute, 5 minutes, 20 minutes, 1 hour, 2 hours, or 6 hours.

  • Page 30: Calibrating The Meter

    SECTION 3, continued To turn off automatic data transfer: 1. Access setup 10 as described above. 2. Press the key. ENTER 3. When the question mark is flashing next to the 10, press the down arrow until appears in the display. (off) 4.

  • Page 31: Do Probe

    SECTION 3, continued 3.3 DO Probe 3.3.1 Probe Assembly 1. Remove the membrane protector from the membrane cap without covering the hole as the protector is pulled off (Figure 6). 2. Hold the membrane cap in a vertical position. 3. Fill the membrane cap about full with Dissolved Oxygen Electrolyte Filling Solution.

  • Page 32: Probe Polarization

    Figure 6 DO Probe Assembly 3.3.2 Probe Polarization Hach dissolved oxygen probes are continuously polarized when they are connected to the instrument. A steady reading will not be seen for 30 to 50 minutes when the probe electrolyte is new or when the probe has been unplugged for more than one hour.

  • Page 33: Zeroing The Probe

    SECTION 3, continued 3.3.3 Zeroing the Probe Zeroing the sens 8 Dissolved Oxygen meter is necessary only when measuring dissolved oxygen levels less than 1 mg/L or 10% saturation. When measuring in this range, zero the meter prior to calibration. 1.

  • Page 34: Calibration In Water Saturated Air

    SECTION 3, continued 9. When the meter cannot complete the zeroing procedure it will begin to beep and show the faulty probe icon. If the meter does not complete the zeroing procedure and exit to the Read mode, add additional sodium sulfite and cobalt standard solution to the stirring water.

  • Page 35: Calibration To A Known Dissolved Oxygen Concentration

    SECTION 3, continued 7. Press the key. The display will show the current value ENTER for the altitude. Use the keypad to enter the altitude of the meter. Note: If the true barometric pressure has just been entered, the altitude has to be set to 0 meters (0 feet) or inaccurate calibration may result.
  • Page 36 SECTION 3, continued may not produce an adjustment equivalent to the value obtained by a Winkler titration because various ions affect the dissolved oxygen concentration differently. The sample used for this calibration should be similar in temperature and atmospheric exposure to the sample used for the determination made by an alternate method.

  • Page 37: Calibrating A Sample To Read 100% Saturation

    SECTION 3, continued concentration in mg/L based on the values of the original calibration. To use this approach: 1. Measure the sample salinity using an Electrolytic Conductivity meter. 2. Press the key. 3. Press the key twice to skip the barometric pressure ENTER and altitude entries.

  • Page 38: Calibration Review

    SECTION 3, continued 4. Press the key three times to skip to the display ENTER showing 100% 5. Press the key. The stabilizing icon will appear while ENTER the meter completes the calibration. 6. When the calibration is complete, the meter will return to the Read Mode.

  • Page 39: Measuring Dissolved Oxygen

    SECTION 3, continued 3.4 Measuring Dissolved Oxygen 3.4.1 General Probe Operation Follow the procedures presented below to obtain maximum performance and accuracy from your sens 8 DO system: • Use the DO probe for aqueous applications only. • Take extra care when handling and storing the oxygen membrane module cap.

  • Page 40: Probe Storage

    SECTION 3, continued 3. Insert the probe into the sample to the desired depth. The probe must be deep enough to cover the thermistor (metallic button) located on the side of the probe. 4. Agitate the probe in the sample to dislodge air bubbles from the sensing area of the probe tip.

  • Page 41: Maintenance

    When the DO probe is withdrawn, the displaced solution can drain back into the bottle. • The funnel is designed to act as an electrode holder. This kit is designed for use with Hach Model 51970 DO probe only.

  • Page 42: Making Bod Determinations

    SECTION 3, continued 3.6 Making BOD Determinations Use the Hach BOD Accessory Kit with a magnetic stir plate and a standard 300-mL BOD bottle. 1. Fill a standard 300-mL BOD bottle with the water sample and insert the overflow funnel.
  • Page 43 SECTION 3, continued 5. Start the magnetic stirrer and increase the speed until the rotor loses its cycle. Adjust until the rotor regains its cycle. Mark this point on the speed scale of the stirrer. This identifies the optimum working point. Insufficient stirring will cause low results.

  • Page 45: Section 4 Storing And Recalling Data

    SECTION 4 STORING AND RECALLING DATA 4.1 Storing Measurements The sens ™8 meter can store up to 99 measurement readings. Data must be stored to recall it for later review, downloading, or printing. Although the meter display will only show the temperature, data location, and dissolved oxygen value, the following information is stored (and can be downloaded or printed) for each sample:...

  • Page 46: Recalling Stored Data

    SECTION 4, continued 2. Press to store the measurement reading in that ENTER location number. To store the data in another location, use the arrow keys to scroll to that location number or enter a location using the number keys. Press ENTER 3.

  • Page 47: Erasing Data

    SECTION 4, continued 4.3 Erasing Data 4.3.1 Erasing Single Data Points 1. To erase data, it must be recalled first. See Section 4.2. 2. When the desired data point is displayed, press ERASE 3. The meter will display (flashing). Press ERASE ENTER to erase the data.

  • Page 49: Section 5 Maintenance

    SECTION 5 MAINTENANCE 5.1 Cleaning the Probe During normal use, rinse the probe thoroughly with deionized water between measurements. This will minimize the buildup of interfering substances on the probe element. If the sample contains oils, grease, or fats, the probe may become coated.

  • Page 51: Section 6 Printing And Data Transfer

    6.1.1 Connection with the RS232 Cable The standard 9-pin RS232 connector on the meter connects with a 9-pin sub-D connector. Hach offers an RS232 9-pin to 5-pin cable (Cat. No. 48129-00). The RS232 interface output is an 8-bit data word plus one stop bit and no parity with a baud rate of 1200.
  • Page 52 SECTION 6, continued 1. Connect the RS232 cable to the meter by lining up the holes in the cable connector with the pins of the serial port. 2. Connect the cable to the printer in the same manner (see Figure 7). 3.

  • Page 53: Connecting To A Personal Computer

    SECTION 6, continued 6.1.3 Connecting to a Personal Computer Connect the meter to a personal computer (PC) with the computer interface cable (Cat. No. 48129-00) listed under REPLACEMENT PARTS on page 77. The cable provides a direct link between the meter and the 9-pin D connector used for the serial port on most personal computers.
  • Page 54 Data captured in the spreadsheet format is easily transferred into most spreadsheet programs (i.e., Excel, Microsoft Works, Lotus 123) for graphing and reporting. To install and run Hach Data Capture, the computer and software must meet the following minimum requirements: •...

  • Page 55: Sending Data To Printers/Computers

    SECTION 6, continued 6.2 Sending Data to Printers/Computers 6.2.1 Sending Currently Displayed Data To print or transfer a current reading: 1. Wait until the display is stable. Press PRINT. 2. The word will be briefly displayed, then the meter PRINT will return to Reading mode.

  • Page 56: Printed Data Format

    SECTION 6, continued c. Press to print all stored data (data that is printed ENTER but not stored will not be included). The word will PRINT be displayed until all the data has been printed. Then the meter will return to the first recalled sample. Press EXIT to return to Reading mode or an arrow key to scroll to a specific data point.

  • Page 57: Section 7 Dissolved Oxygen In Water

    SECTION 7 DISSOLVED OXYGEN IN WATER (0 to 20 mg/L) Assemble the At least one hour Zero the Secure the probe dissolved oxygen probe before measurement, sens ™8 Dissolved cable to the calibration as described in Section polarize the probe by Oxygen meter prior to and storage chamber by 3.3.1 Probe Assembly.
  • Page 58 SECTION 7, continued Prepare the Insert the DO probe Allow at least ten Press the key. calibration and storage into the calibration and minutes for the chamber by holding it storage chamber. The atmosphere in the under water and probe tip must not be chamber to reach a squeezing it a couple of flooded with water or be...
  • Page 59 SECTION 7, continued The main display Press the When the altitude Since this ENTER will show the current key. The display will is correct in combination calibration is performed value for the barometric show the current value with the barometric in water-saturated air, set pressure.
  • Page 60 SECTION 7, continued If sample salinity Insert the probe Agitate the probe Stir the sample has been measured using into the sample. The in the sample to dislodge vigorously with the an Electrolytic probe must be deep air bubbles from the probe or use a stir stand Conductivity Meter, enough to cover the...
  • Page 61 SECTION 7, continued Table 5 Adjusting Barometric Pressure and Altitude Enter a new barometric pressure when the barometric pressure or the altitude of the instrument changes using one of the methods below: Using Sea Level Equivalent Using True Barometric Pressure Obtain the sea level equivalent barometric Obtain the true barometric pressure from a nearby mercury barometer or use Table 8 on...
  • Page 62 SECTION 7, continued Interferences Oxidizing gases such as chlorine, chlorine dioxide, sulphur trioxide, and bromine can react at the cathode to produce positive interferences. Reducing gases such as hydrogen, hydrogen sulfide, sulfur dioxide, and boranes can react at the anode. After exposure to reducing gases, the user may need to clean the anode and replace the internal filling solution and membrane cap.

  • Page 63: Section 8 Troubleshooting

    SECTION 8 TROUBLESHOOTING 8.1 Error Codes Error codes inform the user of an out-of-range value or meter problem. Table 6 outlines the operator assistance codes available in the meter series. Table 6 Error Code Error Type Possible Remedy Data error in the non-volatile memory. Turn off the meter, then turn it on again.

  • Page 65: Section 9 Reference Tables

    SECTION 9 REFERENCE TABLES The following tables have been provided as a reference, but are not required for use with the DO meter. 9.1 Salinity Correction Factors Use the values in Table 7 if the conductivity meter in use does not measure salinity.

  • Page 66: Barometric Pressure And Elevation

    SECTION 9, continued 9.2 Barometric Pressure and Elevation Table 8 is used to estimate the true barometric pressure at certain elevations. The correspondence is based on the assumption that at sea level the barometric pressure is 760 mm Hg. After determining the barometric pressure from the table or a local weather service, enter this value into the instrument (see Sections 3.1.5 and 3.1.6).

  • Page 67: Solubility Of Oxygen In Water

    SECTION 9, continued 9.3 Solubility of Oxygen in Water Table 9 Solubility of Oxygen in Water Exposed to Water-Saturated Air at Atmospheric Pressure (101.3kPa) Oxygen Solubility mg/L Temp. °C Salinity: 18.0 27.0 36.0 14.62 13.73 12.89 12.11 11.37 14.22 13.36 12.55 11.79 11.08...
  • Page 68 SECTION 9, continued Table 9 Solubility of Oxygen in Water Exposed to Water-Saturated Air at Atmospheric Pressure (101.3kPa) (Continued) Oxygen Solubility mg/L Temp. °C Salinity: 18.0 27.0 36.0 30.0 7.56 7.20 6.85 6.52 6.20 31.0 7.43 7.07 6.74 6.41 6.10 32.0 7.31 6.96...
  • Page 69 SECTION 9, continued Table 10 Solubility of Oxygen in Water vs. Temperature and Barometric Pressure (lower range) (Continued) Pressure mm Hg inches Hg 21.7 22.6 23.6 24.6 25.6 26.6 27.6 Temp. °C Oxygen Solubility mg/L 9.21 9.64 10.06 10.48 10.91 11.33 11.75 8.98...
  • Page 70 SECTION 9, continued Table 10 Solubility of Oxygen in Water vs. Temperature and Barometric Pressure (lower range) (Continued) Pressure mm Hg inches Hg 21.7 22.6 23.6 24.6 25.6 26.6 27.6 Temp. °C Oxygen Solubility mg/L 5.58 5.85 6.12 6.38 6.65 6.92 7.19 5.48...
  • Page 71 SECTION 9, continued Table 11 Solubility of Oxygen in Water vs. Temperature and Barometric Pressure (upper range) Pressure mm Hg inches Hg 28.5 29.5 29.9 30.5 31.5 32.5 33.5 Temp °C Oxygen Solubility mg/L 13.94 14.43 14.62 14.91 15.39 15.88 16.36 13.56 14.03...
  • Page 72 SECTION 9, continued Table 11 Solubility of Oxygen in Water vs. Temperature and Barometric Pressure (upper range) (Continued) Pressure mm Hg inches Hg 28.5 29.5 29.9 30.5 31.5 32.5 33.5 Temp °C Oxygen Solubility mg/L 8.17 8.46 8.58 8.75 9.04 9.33 9.62 8.02...

  • Page 73: Pressure Conversions

    SECTION 9, continued 9.4 Pressure Conversions Refer to Table 12 for Pressure Converions or use the conversion factors in Table 13. Table 12 Pressure in mbar, mm Hg and in. Hg mbar mm Hg inches Hg mbar mm Hg inches Hg 525.0 20.67 645.1...
  • Page 74 SECTION 9, continued Table 12 Pressure in mbar, mm Hg and in. Hg mbar mm Hg inches Hg mbar mm Hg inches Hg 637.6 25.10 1010 757.6 29.83 641.3 25.25 1015 761.3 29.97 1020 765.1 30.12 1065 798.8 31.45 1025 768.8 30.27 1070...

  • Page 75: General Information

    GENERAL INFORMATION At Hach Company, customer service is an important part of every product we make. With that in mind, we have compiled the following information for your convenience.

  • Page 77: Replacement Parts

    REPLACEMENT PARTS Description unit Cat. No. Barometer/Altimeter................each ....27584-00 Battery, for PN60 Citizen Printer 26687-00.........each ....26688-00 BOD Accessory Kit Includes funnel and spacer for Dissolved Oxygen Probe ....each ....51971-00 Cable, Dissolved Oxygen Probe, 1 meter ..........each ....51970-00 Cable, Dissolved Oxygen Probe, 3 meter ..........each ....51970-03 Cable, Dissolved Oxygen Probe, 15 meter ..........each ....51970-15 Calibration Storage Chamber, Dissolved Oxygen Probe .....each ....51974-00 Cobalt Standard Solution, 100 mg/L..........100 mL....21503-42...

  • Page 78: How To Order

    HOW TO ORDER...

  • Page 79: Repair Service

    REPAIR SERVICE...

  • Page 80: Warranty

    WARRANTY ™ Hach warrants the sens meters against defective materials or workmanship for three years from the date of shipment.

  • Page 81: Certification

    CERTIFICATION Hach Company certifies this instrument was tested thoroughly, inspected and found to meet its published specifications when it was shipped from the factory. The sens 8™ Dissolved Oxygen Meter has been tested and is certified as indicated to the following instrumentation standards:...
  • Page 82 Règlement sur le matériel brouilleur du Canada. FCC PART 15: Class emission “A” limits. Supporting test records by Hewlett Packard, Fort Collins, Colorado Hardware Test Center (A2LA # 0905-01), certified compliance by Hach Company. This device complies with Part 15 of the FCC Rules. Operation is...
  • Page 83 CERTIFICATION, continued Changes or modifications to this unit not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment. This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules.

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