Delta OHM HD25.2 Manual
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Delta OHM HD25.2 Manual

Turbidimeter
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REV. 1.0
th
14
Nov. 2006
HD25.2
Our instruments' quality level is the results of the product continuous development. This
can bring about differences between the information written in this manual and the
instrument that you have purchased. We cannot entirely exclude errors in the manual, for
which we apologize.
The data, figures and descriptions contained in this manual cannot be legally asserted. We
reserve the right to make changes and corrections without prior notice.

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Summary of Contents for Delta OHM HD25.2

  • Page 1 REV. 1.0 Nov. 2006 HD25.2 Our instruments' quality level is the results of the product continuous development. This can bring about differences between the information written in this manual and the instrument that you have purchased. We cannot entirely exclude errors in the manual, for which we apologize.
  • Page 2 HD25.2 - Turbidimeter 1. Connectors 2. ESC key: in the menu, cancels the current setting. 3. MEM key: stores the currently displayed screen. 4. Battery symbol: indicates the battery level. The symbol does not appear when the external power supply is connected.
  • Page 3 HD25.2 Connectors 16. Power supply input 12Vdc/1A for ∅ 5.5mm - 2.1mm connector. 17. USB2.0 connector - type B. 18. RS232C serial port, sub D 9-pole connector.

  • Page 4: Introduction

    A stabilized power supply of the sources and advanced electronics guarantee optimum instrument performance over time. The HD25.2 is a datalogger. It memorizes up to 999 samples. The measured data can be transferred from the instrument connected to a PC via the RS232C serial port or the USB 2.0 port.

  • Page 5: Measurement Principle

    EASUREMENT RINCIPLE The most known liquid analysis methods, like pH, conductivity or dissolved Oxygen measurements, express quantitatively the parameters that determine the solution's chemical-physical state. Such methods allow measuring the quantity of substances dissolved in the liquid, for example as ions. The substances suspended in the liquids are not measured using these methods.

  • Page 6: Keyboard Description

    EYBOARD DESCRIPTION ON-OFF key The instrument is turned on and off using the ON/OFF key. The turning on starts a self test that checks the instrument status. In the following window you will enter the password identifying the user: press ENTER to access as a non registered user (Anonymous).
  • Page 7 MEM key Stores the displayed data using the current unit of measurement. The following is also recorded: measurement method (EBC, NTU, FTU,…), current date, ID and calibration date. For the details see the chapter dedicated to recording on page 22. ESC key In the menu, this key cancels the current setting.

  • Page 8: Menu Description

    ENU DESCRIPTION To access to the menu press the MENU key: the first item will display. Press ENTER to go to the following items. To modify the item displayed, use the arrow keys ( ). The current value is confirmed by pressing the ENTER key and the display moves on to the next parameter. If pressing ESC the setting is cancelled.
  • Page 9 Note: the day is counted at midnight: by entering 1, at midnight of the same day, the calibration is considered expired. 9. CAL RESIDUAL DAY (Days to calibration expiration): displays the number of days to the calibration expiration. This item cannot be modified. 10.

  • Page 10: User Management

    ANAGEMENT Upon turning on the instrument, the user must identify himself or herself by entering a password: each password is associated to a registered user indicated in the printing and recording operations. The available users are: administrator, user_1, user_2, user_3 and anonymous user. The Administrator is enabled to use all of the instrument functions and assigns the password to the other users.

  • Page 11: Measurement Process

    EASUREMENT ROCESS The following steps outline how to carry out a turbidity measurement. • The cell must be accurately cleaned with distilled water and a non aggressive detergent. Before measurement check that the cell is clean and that no fingerprints are present. •...

  • Page 12: Calibration

    ISONEPH and EBC scales require four calibration standard, WHITE %T and IR %T only need the 0 NTU standard. The HD25.2 must be calibrated before using it for the first time, and when a check using the calibration standards detects an error exceeding ±10%.

  • Page 13: Calibration Of The Isoneph And Ebc Scales

    8. Press ENTER to continue. The MEAS message is shown in the comment line. After a few seconds the “UP DOWN TO CHNG VAL” message appears and the next standard will be STCAL 4 equal to 800 NTU. 9. Insert the standard cell STCAL 4 equal to 800 NTU. If the turbidity value is slightly different from 800, correct it using the arrows.

  • Page 14: Calibration Of The Ir %T Scale

    Calibration of the IR %T scale The following steps are performed to calibrate the IR %T scale. 1. Select the IR %T measurement method using the arrows. 2. Press simultaneously MENU and ENTER to start the calibration procedure. 3. The “H2O_INSERT” message appears: insert the standard cell STCAL 1 equal to 0 NTU in the measurement compartment and screw the cap.

  • Page 15: Battery Replacement

    ATTERY REPLACEMENT The HD25.2 is supplied by three 1.5V, AA batteries or by external power supply (12Vdc/1A). The battery symbol on the display constantly shows the battery charge status. To the extent that batteries have discharged, the symbol "empties". When the charge decreases still further it starts blinking…...

  • Page 16: Instrument Storage

    Malfunctioning upon turning on after battery replacement After replacing the batteries, the instrument may not restart correctly; in this case, repeat the operation. After disconnecting the batteries, wait a few minutes in order to allow circuit condensers to discharge completely; then reinsert the batteries. Warning About the Use of Batteries •...

  • Page 17: Instrument Signals And Faults

    NSTRUMENT IGNALS AND AULTS The following table lists all error indications and information displayed by the instrument and supplied to the user in different operating situations: Display indication Explanation This appears during calibration if a wrong standard is inserted. Measurement overflow: this appears when the measurement value OVER exceeds the expected measurement range, or when the instrument has not been calibrated on that scale.

  • Page 18: Serial Interface And Usb

    ERIAL NTERFACE AND The HD25.2 is fitted with an electrically isolated RS-232C serial interface, and an USB 2.0 interface. The instrument can be connected using a serial cable with sub D 9-pole female connectors (code 9CPRS232) and a cable with USB2.0 connectors (code CP22).
  • Page 19 COMMAND ACTION RESPONSE NOTES Start measurement & LDxxxx Send sample Dump or ? Xxxx from 1 to 1000 no. xxxx+1 Clear memory & No. of next memory location Next avail. Memory =0001 request Type of measurement reading &n n = see MW command MW0..5 Type of measurement selection 0 = EPA 180...

  • Page 20: Connection To Apc

    SERIAL PORT 1. The measuring instrument has to be switched off. 2. Using the Delta Ohm 9CPRS232 cable, connect the measurement instrument to the first free serial port (COM) of the PC. 3. Turn on the instrument and set the baud rate to 38400 (MENU >> “Baud Rate” >> select 38400 using the arrows >>...
  • Page 21 Connect the instrument to the PC USB port. When Windows detects the new device, the "New software installation wizard" is started. If you are asked for the authorization to search an updated driver, answer NO and continue. In the installation window, select “Install from a list or specific location”. In the next window select “Search for the best driver in these locations”...

  • Page 22: Storing And Transferring Data To Apc

    RANSFERRING ATA TO A The HD25.2 instrument can be connected to a personal computer via an RS232C serial port or USB port, and exchange data and information through the DeltaLog11 software running in a Windows operating environment. It is possible to print the measured value on a 24 column printer (PRINT key) and store it in the internal memory using the logging function (MEM key).
  • Page 23 • The print out is formatted across 24 columns. • The direct connection between instrument and printer via a USB connector does not work. Example of a printout obtained using the S'print-BT printer NOTES Instrument model HD25.2 model Turbidimeter Instrument serial number SN= 12345678 Calibration date Cal.=2005/11/23 15:22:53...

  • Page 24: Functioning Notes And Operating Security

    UNCTIONING OTES AND PERATING ECURITY Authorized use The instrument has been designed exclusively for laboratory measurements. Comply with the technical specifications outlined in the chapter TECHNICAL DATA on page 25. Its use is authorized only in conformity with the instructions written in this manual. Any different use is considered improper.

  • Page 25: Technical Characteristics

    ECHNICAL CHARACTERISTICS Instrument Dimensions (Length x Width x Height) 220x120x55mm Weight 400g (batteries included) Materials LCD Display 4½ digits plus symbols Visible area: 52 x 42 mm Operating conditions Operating temperature instrument alone 0…50°C Warehouse temperature instrument alone -25…65°C Working relative humidity 0…90%RH without condensation Calibration standards storage 5…25°C (not to higher temperatures,...
  • Page 26 Accuracy 1min/month max departure Measured values memorization Quantity 999 samples RS232C serial interface Type RS232C electrically isolated Baud rate Can be set from 1200 to 38400 baud Data bit Parity None Stop bit Flow Control Xon/Xoff Serial cable length Max 15m USB interface Type 1.1 - 2.0 electrically isolated...

  • Page 27: Order Codes

    RDER CODES HD25.2 The kit is composed of: HD25.2 instrument, 4 empty cells, 4 calibration standards STCAL, 3 1.5V alkaline batteries, lubricating cloth, silicon oil 25cc, operating manual, case and DeltaLog11 software for operating systems Windows 98 to XP. Accessories 9CPRS232 Connection cable with sub D 9-pole female connectors for RS232C.

  • Page 28: Table Of Contents

    TABLE OF CONTENTS INTRODUCTION ................................4 ............................. 5 EASUREMENT RINCIPLE ............................5 EASUREMENT TANDARD KEYBOARD DESCRIPTION............................6 MENU DESCRIPTION ..............................8 USER MANAGEMENT ..............................10 MEASUREMENT PROCESS ............................11 CALIBRATION................................12 Calibration of the EPA 180.1 and ASBC scales...................... 12 Calibration of the ISONEPH and EBC scales......................
  • Page 31 All DELTA OHM instruments have been subjected to strict tests and are guaranteed for 24 months from date of purchase. DELTA OHM will repair or replace free of charge any parts which it considers to be inefficient within the guarantee period.
  • Page 32 WICHTIG: Die Garantie ist nur gültig, wenn dieser Abschnitt bis ins Einzelne ausgefüllt ist. Este certificado debe acompañar al aparato enviado al centro de asistencia. IMPORTANTE: La garantía es válida solo si el presente cupón ha sido completado en su totalidad. HD25.2 Instrument type Serial number...

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