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Hach sension 4 Instruction Manual

Laboratory ph/ise meter
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51775-18
Laboratory
pH/ISE Meter
Instruction Manual
© Hach Company, 1999. All rights reserved. Printed in the U.S.A.
te/dk 1/02 2ed

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  • Page 1 51775-18 Laboratory pH/ISE Meter Instruction Manual © Hach Company, 1999. All rights reserved. Printed in the U.S.A. te/dk 1/02 2ed...
  • Page 2 TRADEMARKS OF HACH COMPANY AccuGrow ® H 2 O University™ Pond In Pillow™ AccuVac ® PourRite ® H 2 OU™ Hach Logo ® AccuVer™ PrepTab™ Hach One ® AccuVial™ ProNetic™ Hach Oval ® Add-A-Test™ Pump Colorimeter™ QuanTab ® AgriTrak™ Hach.com™...

  • Page 3: Table Of Contents

    TABLE OF CONTENTS CERTIFICATION ........................5 SAFETY PRECAUTIONS ....................... 9 SPECIFICATIONS........................11 OPERATION ........................13 SECTION 1 INTRODUCTION ..................15 1.1 Unpacking the Instrument ....................15 1.2 Standard Accessories......................15 1.3 Keypad Description ......................16 1.4 Display Fields and Icons ....................18 1.5 Audible Signals .........................
  • Page 4 TABLE OF CONTENTS, continued 3.2.3 One-Point Calibration ..................... 33 3.3 ISE Calibration ......................... 34 3.4 Reviewing Calibrations..................... 36 3.5 Measuring Sample pH ...................... 38 3.6 Measuring Samples Using ISEs..................38 3.7 Measuring Samples Using Standard Additions ..............39 SECTION 4 STORING AND RECALLING DATA ..........

  • Page 5: 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 ™4 Laboratory pH/ISE Meter has been tested and is certified as indicated to the following instrumentation standards:...
  • Page 6 EMC requirements). Class B emission limits. Supporting test records by Hewlett Packard Hardware Test Center, Ft. Collins, CO (A2LA #0905-01), certified compliance by Hach Company. Standards include: EN 61000-3-2 Harmonic Disturbances Caused by Electrical Equipment...
  • Page 7 CERTIFICATION, continued (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. 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.

  • Page 9: Safety Precautions

    SAFETY PRECAUTIONS Section 2.2 on page 21 Section 2.3 on page 21 Section 2.4 on page 23 Section 5.1 on page 45...

  • Page 11: Specifications

    ±0.3 °C from 0–70 °C ±1.0 °C from 70–110 °C Display: Custom LCD Inputs: 2 BNC; two 5-pin Hach pH/temperature or Hach temperature probe; 2 pin-tip; (one combination input type for each of the two channels or two half-cells per channel).
  • Page 12 SPECIFICATIONS, continued Environmental Requirements: 0 to 50 °C at 85% non-condensing relative humidity. Enclosure is water resistant, chemical resistant, dust proof. Dimensions: 25.4 x 15 x 8.37 (10.15 x 6 x 3.35 in.)

  • Page 13: 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 15: Section 1 Introduction

    SECTION 1 INTRODUCTION Hach provides pH and ISE meters for applications from pH measurements to accurate Ion Selective Electrode work. This manual describes the operation and use of the Hach sens ™4 Portable pH/ISE/mV/Temperature Meter (see Figure 1). This meter features a custom digital LCD display which simultaneously displays temperature and measurement results.

  • Page 16: Keypad Description

    SECTION 1, continued 1.3 Keypad Description Figure 1 illustrates the meter’s keypad. The description and function of each key are given in Table 1. Figure 1 Hach sens 4 Meter...
  • Page 17 SECTION 1, continued Table 1 Keys and Description Description Exit/Power On-Off Turns the instrument on; turns it off from a Reading mode. Acts as a NO or Cancel key when the question mark icon is flashing. In Setup mode, backs up one step toward the Reading mode. Performs the following and returns to the most recent Reading mode: •...

  • Page 18: Display Fields And Icons

    SECTION 1, continued 1.4 Display Fields and Icons The display has two screens. The upper screen displays measurements or standard values, operation mode, slope, sample/default temperature, pH or mV units, error codes, and indicates if the meter reading is stable. The lower screen displays keys that are active.
  • Page 19 SECTION 1, continued Table 2 Main Display Elements Item No. Description Indicates meter is in Standard Addition mode. 2 (Cal Indicates meter is in Calibration Review mode. Review) Used with to ask if user wants to store calibration, standard value, or sample value Indicates the meter is measuring/reviewing a sample (sample # is displayed to the right).

  • Page 20: Audible Signals

    SECTION 1, continued Table 2 Main Display Elements (Continued) Item No. Description Indicates the displayed number is the electrode slope. Indicates Time is being set or displayed. Stabilizing... When on or flashing, indicates signal from sample is not yet stable. When it disappears, the reading is stable.

  • Page 21: Section 2 Instrument Setup

    SECTION 2 INSTRUMENT SETUP 2.1 Instrument Description This sens ™4 Laboratory pH/ISE/mV meter is designed for laboratory use and operates on 115/230 VAC power. Two channels are available for electrode connection. The meter measures from -2.0 to 19.99 pH units and the sample temperature.

  • Page 22: Temperature Probe Connection

    4 Power, RS232, and Probe Connections 2.3.2 Temperature Probe Connection Hach pH electrodes with the 5-pin connector have the temperature sensing unit included in the electrode probe and require only the 5-pin connector. If using a pH electrode with BNC connector, connect the Hach Temperature Probe (Cat.

  • Page 23: 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 on the meter (see Figure 3). 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 24: Millivolt Measurements

    -2000.0 to +2000.0. The millivolt mode is useful when measuring oxidation-reduction potential, performing potentiometric titrations, or preparing calibration curves. Detailed instructions for any Hach electrode are given in the electrode instruction manual. Titration instructions are included in the Hach ORP Electrode Instruction Manual, or in standard analytical...

  • Page 25: Section 3 Instrument Operation

    SECTION 3 INSTRUMENT OPERATION 3.1 Setup Menu The sens ™4 Laboratory pH/ISE meter has a setup menu for each channel which allows the analyst to choose options for connector choice, display lock, temperature units, display resolution, automatic buffer recognition, time, date and others (see Table 3).

  • Page 26: Turning Display Lock Off And On

    SECTION 3, continued 1. From the reading mode, press SETUP 2. The icon and the number (flashing) will be displayed. Setup Change the connector choice by pressing ; this toggles ENTER the selection between 5 pin 3. When the desired option is selected, press to return to EXIT the reading mode.

  • Page 27: Selecting Measurement Resolution

    SECTION 3, continued 3.1.4 Selecting Measurement Resolution The meter can display pH measurement values to tenths (0.0), hundredths (0.00) or thousandths (0.000). The default is hundredths. The choice of resolution affects the stability criteria. 1. From the reading mode, press SETUP 2.

  • Page 28: Setting The Time

    SECTION 3, continued The default stability drift rate is 0.500 mV/min. Lower stability criteria (i.e., 0.300 mV/min) will require longer stabilization times, but the measurement will be more precise. Higher stability criteria will require shorter stabilization times, but measurements may be less precise. To change this option: 1.

  • Page 29: Setting The Month And Day

    SECTION 3, continued 5. Once a number key is pressed, the next digit place holder will flash. Continue to enter the desired numbers until all four places have a value. Press ENTER 6. If a number entry error occurs, start over by pressing SETUP/CE 7.

  • Page 30: Setting The Year

    SECTION 3, continued 3.1.9 Setting the Year 1. From the reading mode, press SETUP 2. The icon and the number will be displayed. Setup 1 (flashing) Press the up arrow until the Setup number is . The display will show in the main display.

  • Page 31: Calibrating The Meter

    Calibrating with buffers that have pH values other than these requires a modified procedure. Each channel requires independent calibration. Hach recommends a daily two-point calibration using buffers that bracket the sample pH. This will verify the electrode is working properly and allow the slope value to be stored.

  • Page 32: Calibrating With Other Buffers

    SECTION 3, continued accept the reading. This lets the operator control the acceptance point of the buffer. 7. When the reading has been accepted, the standard number will change to 8. Remove the probe from the first buffer and rinse with deionized water.

  • Page 33: One-Point Calibration

    SECTION 3, continued 5. Place the pH electrode in a buffer (starting with the lowest pH makes it easy to keep track). 6. Enter the pH value of the buffer using the number keys and press . A flashing underscore ( ) indicates where the ENTER next number will be placed.

  • Page 34: Ise Calibration

    However, a temperature probe will still function properly and display the correct sample temperature. Use the 5-pin temperature probe available from Hach, Cat No. 51980-00. 1. Prepare standards according to the electrode instruction manual or the instructions for the standard. Use two to five standards for calibration.
  • Page 35 SECTION 3, continued 8. To enter or change the standard’s concentration value, use the number keys, then press . A flashing underscore ( ENTER indicates where the next number will be placed. It is not necessary that all four places have a number entered in them. To retain the standard concentration value, just press ENTER Note: Once a new value is entered, the meter will assume the calibration...

  • Page 36: Reviewing Calibrations

    SECTION 3, continued 17. To save the calibration and return to the reading mode, press . To exit the calibration without saving it and return to ENTER the reading mode, press EXIT 18. After the calibration is stored, the meter is immediately ready to begin measuring samples.
  • Page 37 SECTION 3, continued 1. Select the desired channel. From the pH or ISE reading mode, press the key. To review the pH calibration, be REVIEW sure the meter is in pH mode. To review the ISE calibration, be sure the meter is in ISE reading mode. View mV values by pressing the key.

  • Page 38: Measuring Sample Ph

    SECTION 3, continued 3.5 Measuring Sample pH See instructions in the electrode manual for more information and specific steps for using the electrode. 1. Place the electrode in the sample. Press READ/ENTER will be displayed, along with the sample Stabilizing... temperature and the pH or mV reading.

  • Page 39: Measuring Samples Using Standard Additions

    SECTION 3, continued 3. Record or store the concentration or mV value. See SECTION 4 on page 41 to store or recall data. 4. Remove the electrode from the sample, rinse with deionized water, and blot dry. Place the electrode in the next prepared sample.
  • Page 40 SECTION 3, continued 8. After stabilizing, the display will show , a flashing Standard , and a value for the standard volume. 9. To change the standard volume, use the numerical keypad. When entry is complete or no change is needed, press ENTER 10.

  • Page 41: Section 4 Storing And Recalling Data

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

  • Page 42: Recalling Stored Data

    SECTION 4, continued 4.2 Recalling Stored Data 1. To recall stored data, press the key while in the RECALL Reading mode. The screen will display the most recently saved or recalled measurement data. 2. Use the arrow keys to scroll to the desired storage location. Press again to allow number entry of a storage RECALL...

  • Page 43: Erasing All Data Points

    SECTION 4, continued 4.3.2 Erasing All Data Points 1. To erase data, it must be recalled first. Press the RECALL while in the Reading mode. See Section 4.2 for more information. 2. When the data point is displayed, press ERASE 3.

  • Page 45: Section 5 Printing/Transferring Data

    The Citizen PN60 printer requires a special cable to fit into the printer. This cable is shipped with the printer when ordered from Hach Company. Table 4 Standard 9-pin to 25-pin Printer Cable 9-pin D Connector Serial Printer 25-pin D Connector, plug...

  • Page 46: Connecting To A Personal Computer

    SECTION 5, continued Connect the RS232 cable to the meter by lining up the holes in the cable connector with the pins of the meter serial port. Gently and firmly push the cable into the meter. Then secure the connection by screwing in the screws on either side of the cable port.
  • Page 47 Use a communications software, such as HachLink™ (Cat. No. 49665-00) to collect data from the instrument. HachLink is a Windows-based application that allows a personal computer to capture data from several Hach instruments, including the sens electrochemical meters. The captured data can be stored in a text file as a spread-sheet compatible format or a free-format text.

  • Page 48: Sending Data To Printers/Computers

    SECTION 5, continued • IBM PC/AT or compatible with a 386SX processor (16 MHz or better) • 4 megabytes of RAM • Hard disk drive with 2 megabytes or more of free space • 3-1/2 inch, 1.44 megabyte floppy disk drive •...

  • Page 49: Sending Recalled Data Points

    SECTION 5, continued 5.2.3 Sending Recalled Data Points 1. To transfer data, it must be recalled first. Press the RECALL key while in the Reading mode. See Section 4.2 on page 42 for more information. 2. When the desired sample data is displayed, press PRINT 3.

  • Page 50: Printed Data Format

    SECTION 5, continued 5.2.4.1 Printed Data Format Printed data will have the following format: Storage Channel Meter Serial Software Reading Temperature Date Time Location Number Reading Model Number Version <1> 7.53 pH 22.7 C -30.0 10/03/99 08:30 sensIon4 12344577 PX.X <1>...
  • Page 51 SECTION 5, continued Table 6 sens 4 RS232 Commands Command (upper or Returns lower case) sens 4 xxxx Instrument ID (serialized part of serial number) Exit Key Up Arrow Down Arrow Enter Recall Store Erase ISE/mV pH/mV Std Addn Print Channel Time/Date Review...

  • Page 53: Section 6 Troubleshooting

    Other problems must be handled by a Hach technician at a service center. Refer to Repair Service. Do not attempt to service the meter as there are no field-serviceable parts. Opening the meter case will void the warranty.

  • Page 54: Error Codes And Errors

    Repeat calibration with new buffers will be displayed. or standards. Corrupt data Recalled data had a bad checksum. Call Hach Service. 6.4 Meter Service Request Questionnaire 1. What is the complete lot code of the meter and electrode? 2. On what date was the meter purchased? 3.

  • Page 55: 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 57: Replacement Parts

    REPLACEMENT PARTS REPLACEMENT REAGENTS Quantity Required Description Per Test Unit Cat. No. Buffer Powder Pillows: pH 4.01, color-coded red........... 1..50/pkg....22269-66 pH 7.00, color-coded yellow ..........1..50/pkg....22270-66 pH 6.86 (NIST) ..............1..15/pkg....14098-95 pH 10.00, color-coded blue..........1..50/pkg ....22271-66 Buffer Solutions: pH 4.00, color-coded red, NIST........
  • Page 58 REPLACEMENT PARTS, continued OPTIONAL APPARATUS (continued) Description Unit Cat. No. Platinum Series pH Flat Combination Electrode, 5-pin connector..each ..... 51915-00 Platinum Series pH Combination Electrode, w/temp., 5-pin connector..each ..... 51910-00 pH Gel-filled Electrode, w/temp., 5-pin connector .........each ..... 51935-00 Potassium Half-cell..................each ..... 50245-00 Printer Interface Cable, 9-pin to 25-pin ...........each .....

  • Page 59: How To Order

    Specialists in analytical methods, they are happy to put their talents to work for you. Call 1-800-227-4224 or E-mail techhelp@hach.com. International Customers Hach maintains a worldwide network of dealers and distributors. To locate the representative nearest you, send E-mail to intl@hach. com or call (970) 669-3050.

  • Page 60: Repair Service

    REPAIR SERVICE...

  • Page 61: Warranty

    HACH WARRANTS TO THE ORIGINAL BUYER THAT HACH PRODUCTS WILL CONFORM TO ANY EXPRESS WRITTEN WARRANTY GIVEN BY HACH TO THE BUYER. EXCEPT AS EXPRESSLY SET FORTH IN THE PRECEDING SENTENCE, HACH MAKES NO WARRANTY OF ANY KIND WHATSOEVER WITH RESPECT TO ANY PRODUCTS.
  • Page 62 Telephone: (970) 669-3050 FAX: (970) 669-2932 FOR TECHNICAL ASSISTANCE, PRICE INFORMATION AND ORDERING: In the U.S.A. - Call toll-free 800-227-4224 Outside the U.S.A. - Contact the HACH office or distributor serving you. On the Worldwide Web - www.hach.com ; E-mail - techhelp@hach.com...

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