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TOAD OBM-162A Instruction Manual

Dissolved oxygen analyzer
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No. OBM-IB54802E
Please keep this instruction manual close at hand of the persons who are in charge of
the operation of this product.
Before operating this product, please read this instruction manual carefully for its
correct handling.
DISSOLVED OXYGEN
MODEL OBM-162A
ANALYZER

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Summary of Contents for TOAD OBM-162A

  • Page 1 DISSOLVED OXYGEN ANALYZER MODEL OBM-162A Please keep this instruction manual close at hand of the persons who are in charge of the operation of this product. Before operating this product, please read this instruction manual carefully for its correct handling.
  • Page 2 Introduction Introduction (a) Thank you for your purchase of our product. The Model OBM-162A Dissolved Oxygen Analyzer (hereafter called the analyzer or the product) is an indicating analyzer in a measurement system to measure the dissolved oxygen (DO) in various solutions.
  • Page 3 Model: OBM-162A Introduction • Other unpredictable phenomena (h) Since important items are described in “Safety Information,” read the contents carefully. (i) The product should be handled by persons who have received proper training. In addition, for technical services such as repairs, ask a specialist to do who is qualified for the technical certification system in our company or a person who has technical skills equivalent to that certification system.
  • Page 4 Model: OBM-162A Safety Information Safety Information (1) Meaning of markings The signal terminology and symbols related to warnings in the instruction manual are defined below. The alert symbol mark ( : General caution mark) indicates the possibility of hazard or damage and also means “Refer to the instruction manual.”...
  • Page 5 Model: OBM-162A Safety Information Disassembly and Modification Do not disassemble or modify the sections of the product that are not described in the instruction manual. The product can be damaged. Warning Label Lost If any warning label affixed to this product becomes too difficult to read or lost, please order a new one through your local sales agent or our sales office and affix it to its original position.
  • Page 6 Model: OBM-162A Warranty Warranty (1) Warranty Coverage DKK-TOA Corporation (DKK-TOA) warrants its products against defective material or workmanship for the warranty period. (a) The warranty period is one year from the date of delivery to the original user. If the date of delivery cannot be specified, the warranty period is 24 months from the month following the date of manufacture shown on the product nameplate.
  • Page 7 Model: OBM-162A Reading Guide Reading Guide Refer to the necessary sections of this instruction manual depending on your purposes such as understanding the outline of this product or starting the product as shown below. The numbers in circles indicate sections to be referred to in sequential order.
  • Page 8 Model: OBM-162A Table of Contents Table of Contents ●Introduction ······················································································· 1 ●Safety Information ········································································· 3 (1) Meaning of markings ⋅⋅⋅⋅ 3 (2) Safety compliance items ⋅⋅⋅⋅ 3 (3) Notes on use of the instruction manual ⋅⋅⋅⋅ 4 ●Warranty ···························································································· 5 ●Reading Guide...
  • Page 9 Model: OBM-162A Table of Contents (3) Temperature shift ⋅⋅⋅⋅ 48 (4) Alarm ⋅⋅⋅⋅ 49 (5) DO measuring range ⋅⋅⋅⋅ 52 (6) Temperature measuring range ⋅⋅⋅⋅ 53 (7) Wash operation (option) ⋅⋅⋅⋅ 54 (8) Manual wash (option) ⋅⋅⋅⋅ 56 (9) Zero calibration signal value and span calibration signal value ⋅⋅⋅⋅ 57 (10) 25°C saturation current value ⋅⋅⋅⋅...
  • Page 10 Model: OBM-162A Table of Contents (3) RS-232C wiring ⋅⋅⋅⋅ 93 (4) Command format ⋅⋅⋅⋅ 93 8. Installation ····················································································· 95 8.1 Analyzer Mounting ············································································ 95 (1) Installation location ⋅⋅⋅⋅ 95 (2) Mounting example and external dimensions ⋅⋅⋅⋅ 95 8.2 Wire Connection ··············································································· 98 (1) Wire Connection Diagram ⋅⋅⋅⋅...
  • Page 11 Model: OBM-162A 1. Control Panel Functions 1. Control Panel Functions (1) Names of main components Control panel DISP key Display panel ALARM key OUT key STAND-BY key Wash key Up key Down key DATA key CAL key Enter key Names of Main Components...
  • Page 12 Model: OBM-162A 1. Control Panel Functions (2) Functions of keys and indicators Functions of Keys Operation key Function (notation in the text) • Pressing this key for 3 seconds or more in the measurement mode changes the Stand-by key screen to the “Setting Mode DO Measured Value” screen (the initial screen of the setting mode).
  • Page 13 Model: OBM-162A 1. Control Panel Functions (Continued from previous page) Operation key Function (notation in the text) • Pressing this key in the setting mode or in the transmission adjustment mode Up key increases the number for setting or changes the selection item.
  • Page 14 Model: OBM-162A 1. Control Panel Functions Main display (when all lights are lit) STAND-BY indicator mg/L unit mark CAL indicator RANGE indicator % unit mark OUT indicator ALARM indicator Temperature indicator Sub display WAIT indicator Display Panel Functions of Indicators...
  • Page 15 Model: OBM-162A 2.1 Starting the Operation 2. Operation and Calibration 2.1 Starting the Operation Follow the procedure below. The measurement system including the analyzer goes into normal operating state. ① Check the installation condition. ⋅⋅⋅⋅⋅⋅ Check that necessary installation work is completed, which is described in 8.
  • Page 16 Model: OBM-162A 2.1 Starting the Operation 【IMPORTANT】 • Power supply voltage is 100 to 240VAC±10%. If voltage exceeding this range is applied, the analyzer may be damaged. • When connecting a sensor with wash function, check that the washing use power output (option) conforms to the supply power specifications (100VAC±10%, etc.) of the sensor with wash function.
  • Page 17 Model: OBM-162A 2.1 Starting the Operation 8.38 WASH Blinking 【IMPORTANT】 • After checking that the washing operation is started, return the wash interval to its original time. • The washing operation can be stopped by pressing about 1 second during automatic wash.
  • Page 18 Model: OBM-162A 2.2 Overview of Calibration 2.2 Overview of Calibration (a) It is surely necessary for this analyzer before measurement to perform calibration using standard solution and adjust the electrode characteristics and the indication of the analyzer. (b) Though the electrode characteristics changes due to dirt accumulation by sample water when measurement is continued for a long time, this effect can be eliminated by calibration.
  • Page 19 Model: OBM-162A 2.3 Zero Calibration 2.3 Zero Calibration If the dissolved oxygen value is near zero and thus accuracy is required, proceed with the operation in 2.3(1) “Zero calibration using zero solution” and in the case of simple calibration, proceed with the operation in 2.3(2) “Electrical zero calibration”.
  • Page 20 Model: OBM-162A 2.3 Zero Calibration ⑤ Immerse the electrode in zero solution. ⋅⋅⋅⋅⋅⋅ Wash the electrode with ion-exchange water and immerse it in the prepared zero solution (sodium sulfite solution). Electrode Zero solution (Sodium sulfite solution) Immersing the Electrode in Zero Solution ⑥...
  • Page 21 Model: OBM-162A 2.3 Zero Calibration • “0.00mg/L” appears on the main display and zero calibration ends. 0.04 ZERO Temperature indication For Both Auto and Manual (DO Indication) • If zero calibration is needed again, press • To move to span calibration, go to the procedure in 2.4 “Span Calibration”.
  • Page 22 Model: OBM-162A 2.3 Zero Calibration Select manual calibration. ⋅⋅⋅⋅⋅⋅ Press until “MANU” appears on the sub display and press Exit the other screen group. ⋅⋅⋅⋅⋅⋅ Press repeatedly. • “ST-BY” lights and the screen returns to the “Setting Mode DO Measured Value” screen.
  • Page 23 Model: OBM-162A 2.4 Span Calibration 2.4 Span Calibration (1) Span calibration using air This analyzer uses air calibration where calibration value is precise. However, in a location near a heat source or under direct sunlight, it is recommended that you perform calibration using air saturated water because the temperature there tends to become unstable.
  • Page 24 Model: OBM-162A 2.4 Span Calibration ④ Select the type of manual calibration. ⋅⋅⋅⋅⋅⋅ When the “Manual Calibration Select” (Z.ELC/Z.SLU/SPAN) screen appears, press until “SPAN” (span calibration) appears on the sub display. 8.84 SPAN For Span Calibration Using Air (DO Indication) ⑤...
  • Page 25 Model: OBM-162A 2.4 Span Calibration ① Preparation • 500mL beaker • Stirrer • Air pump and bubbler (used when needed) • Ion-exchange water or city water ⋅⋅⋅⋅⋅⋅ 1 to 2L ② Stir ion-exchange water. ⋅⋅⋅⋅⋅⋅ Put ion-exchange water in a beaker about 1/2 to 2/3 of its capacity and stir the water using a stirrer or together with air pump.
  • Page 26 Model: OBM-162A 2.4 Span Calibration • When DO value adjust is set to on and the analyzer goes to the calibration screen group, the value on the main display becomes the value that DO value adjust is turned off. • At the time of calibration, one of the indication items of DO, O and SAT can be selected.
  • Page 27 Model: OBM-162A 2.4 Span Calibration (3) Indicated value at the time of span calibration The output of dissolved oxygen electrode is proportional to its oxygen partial pressure. Oxygen partial pressure in ≒ Oxygen partial pressure in the air = 100kPa × 20.9% = 20.9kPa...
  • Page 28 Model: OBM-162A 2.5 Stopping the Operation 2.5 Stopping the Operation To stop the operation for several weeks or more, as a general rule, perform the procedure shown below. ① Turn off the supply power. ⋅⋅⋅⋅⋅⋅ Turn off the power at the source side of the power cable to the analyzer.
  • Page 29 Model: OBM-162A Modes and Operation Screen Map 3. Modes of Operations 3.1 Modes and Operation Screen Map (1) Mode Switching (a) The screens to check or perform settings are separated into 3 modes as shown below. Measurement mode Setting mode...
  • Page 30 Model: OBM-162A Modes and Operation Screen Map (2) Operation screen map Power turned on (ON) [Measurement mode] ●Measured value screen group ●Alarm display screen group (To switch screen: (To switch screen: ◎Alarm Value 1 Display (L, etc.) ○Dead Band 1 Display Screen (BAND) ◎DO Measured Value...
  • Page 31 Model: OBM-162A Modes and Operation Screen Map - 30 -...
  • Page 32 Model: OBM-162A Modes and Operation Screen Map [ Setting mode ] Setting Mode DO Measured Value Screen Calibration screen group (To switch screen: Zero/Span Auto Check Calibration (DO, etc.) Manual Calibration Select (Z.ELC, etc.) Adjust/shift screen group (To switch screen: 3 seconds or more DO Value Adjust On/Off (D.ADJ)
  • Page 33 Model: OBM-162A Measurement Mode Operation 3.2 Measurement Mode Operation The measurement mode has screen groups given in the following table. In each screen group, the contents set in the setting mode can be checked. Measurement Mode Screen Groups Name Contents Measured value screen group •...
  • Page 34 Model: OBM-162A Measurement Mode Operation Screen Sequence and Contents Screen name Screen example Contents (To switch screen: • Main display ⋅⋅⋅⋅ DO measured value ① ◎ DO Measured Value 8.11 (mg/L) • Sub display ⋅⋅⋅⋅ DO value adjusted rate 120.0 Not displayed if DO value adjust function is invalid.
  • Page 35 Model: OBM-162A Measurement Mode Operation (Continued from previous page) Screen name Screen example Contents (To switch screen: * (The screen during wash using the wash function) • Main display ⋅⋅⋅⋅ DO measured value “DO Measured Value” or 8.11 “DO/ Temperature Measured •...
  • Page 36 Model: OBM-162A Measurement Mode Operation (2) Alarm conditions (a) The alarm display screen group contains the screens shown in the table below. (b) When is pressed in the measurement mode, the screen goes to this group. If the same key is pressed again, the screen changes to the next screen. Pressing the same key while the last screen of this group is displayed brings you back to “DO Measured Value”.
  • Page 37 Model: OBM-162A Measurement Mode Operation (Continued from previous page) Screen name Screen example Contents (To switch screen: • Main display ⋅⋅⋅⋅ oFF ⑥ ◎ Power Off Signal, Electrode Error Signal Invalid Output • Main display ⋅⋅⋅⋅ No display 4.Abn Abn (Electrode error) PoF (Power off) 4.Abn...
  • Page 38 Model: OBM-162A Measurement Mode Operation (3) DO / temperature measuring range (a) The measuring range display screen group contains the screens shown in the table below. (b) When is pressed in the measurement mode, the screen goes to this group. If the same key is pressed again, the screen changes to the next screen.
  • Page 39 Model: OBM-162A Measurement Mode Operation (4) Wash function and operational conditions (option) (a) When the standard specification is used, the screens in this group are not displayed. When the wash function is added, the screens in the following table are provided in the wash display screen group (option).
  • Page 40 Model: OBM-162A Measurement Mode Operation (5) Other setting values (a) The other setting value display screen group contains the screens shown in the table below. (b) When is pressed in the measurement mode, the screen goes to this group. If the same key is pressed again, the screen changes to the next screen.
  • Page 41 Model: OBM-162A Measurement Mode Operation (Continued from previous page) Screen name Screen example Contents (To switch screen: • Main display ⋅⋅⋅⋅ Setting state of Hold ⑤ ◎ Hold Display HoLd type. HoLd ⋅⋅⋅⋅ Outputs the transmission output value immediately before the S.OUT...
  • Page 42 Model: OBM-162A Measurement Mode Operation (6) Reading the calibration history data (a) The calibration history data contains 10 items from A to J. Each of these items is assigned 10 data numbers from 0 to 9. The contents of data items A to J are shown in the table below. The data number shows the calibration history time series, with 0 being the newest data.
  • Page 43 Model: OBM-162A Measurement Mode Operation Screen Sequence and Contents Screen name Screen example Contents (To switch screen: • Main display … Calibration year and ① Calibration Year and Date 10.23 date (western calendar) history Display 2011 • Sub display … A0 (Newest data No.) •...
  • Page 44 Model: OBM-162A Measurement Mode Operation (Continued from previous page) Screen name Screen example Contents (To switch screen: • Main display … Calibration ⑧ Calibration Temperature 25.1 Display temperature (°C) history • Sub display … H0 (Newest data No.) ℃ • Switched to the last data No. using and switched to the next data No.
  • Page 45 Model: OBM-162A 3.3 Setting Mode Operation 3.3 Setting Mode Operation (1) Calibration screen descriptions (a) Performing actual calibration requires preparation of zero solution and operation of the sensor. Perform calibration referring to the following sections. In this section, key operation only is explained.
  • Page 46 Model: OBM-162A 3.3 Setting Mode Operation (Continued from previous page) Procedure and screen example Operation ③ Perform calibration by automatic check. Press ················ • Main display ⋅⋅⋅⋅ DO measured value, O measured 0.82 value, or SAT measured value • Sub display ⋅⋅⋅⋅ Symbol indicating zero calibration or...
  • Page 47 Model: OBM-162A 3.3 Setting Mode Operation Screen Description (Manual Calibration) Procedure and screen example Operation ① Select the “Setting Mode DO Measured Value” Press for 3 seconds or more in the ······ screen. measurement mode. • “ST-BY” lights. ② Select the “Manual Calibration Select” screen.
  • Page 48 Model: OBM-162A 3.3 Setting Mode Operation (Continued from previous page) Procedure and screen example Operation ④ Check that calibration is ended in manual Check that “CAL” is lit and “WAIT” is unlit and ·············· operation. manual calibration is ended. • Main display ⋅⋅⋅⋅ DO measured value, O...
  • Page 49 Model: OBM-162A 3.3 Setting Mode Operation (3) Temperature shift (a) This function adjusts the current temperature measured value to the value of other measuring instrument (such as a thermometer). Selecting valid/invalid for this function and changing the value after temperature shift (parallel shift) are available.
  • Page 50 Model: OBM-162A 3.3 Setting Mode Operation (4) Alarm (a) This function takes out an alarm signal from the alarm output terminals. Selection of this function, distinction between high and low limits, alarm values and dead band can be changed. (b) Each alarm conforms to the following alarm output terminals.
  • Page 51 Model: OBM-162A 3.3 Setting Mode Operation (f) Alarm 3 outputs the maintenance-in-progress signal. • If the mode is changed to the setting mode (press for 3 seconds or more) and the wash function is within the wash time or the wait time after wash, the signal sent from the maintenance-in-progress signal output terminals (34 and 35) is switched to “closed”.
  • Page 52 Model: OBM-162A 3.3 Setting Mode Operation (Continued from previous page) Procedure and screen example Operation ⑤ Change alarm value 1. Change the blinking digit on the main display and then ·········································· press 00.00 • Main display ⋅⋅⋅⋅ Alarm value 1 (DO value) To increase/decrease the number ⋅⋅⋅⋅...
  • Page 53 Model: OBM-162A 3.3 Setting Mode Operation (5) DO measuring range (a) This function changes the DO measuring range. Changing the DO value corresponding to the transmission output 20mA is available. (b) This measuring range corresponds to the transmission output range (4 to 20mADC). The factory setting is set according to the ordered specification.
  • Page 54 Model: OBM-162A 3.3 Setting Mode Operation (6) Temperature measuring range (a) This function changes the temperature measuring range. The range corresponds to the temperature transmission output (4 to 20mADC). The display section shows the temperature in the range of −10 to 100°C, which is the entire measuring range, regardless of the setting of the temperature measuring range.
  • Page 55 Model: OBM-162A 3.3 Setting Mode Operation (7) Wash operation (option) (a) When the analyzer is equipped with wash function (option), this screen group appears. Washing on/off, wash interval, wash time, pulse count, and wait time can be set using this function.
  • Page 56 Model: OBM-162A 3.3 Setting Mode Operation Operation Procedure Procedure and screen example Operation ① Select the “Setting Mode DO Measured Value” Press for 3 seconds or more in the ······ screen. measurement mode. • “ST-BY” lights. ② Select the setting screen.
  • Page 57 Model: OBM-162A 3.3 Setting Mode Operation (Continued from previous page) Procedure and screen example Operation ⑥ Change the wait time. Change the blinking number on the main display and ··········································· then press 03.0 • Main display ⋅⋅⋅⋅ Wait time (min) To increase/decrease the number ⋅⋅⋅⋅...
  • Page 58 Model: OBM-162A 3.3 Setting Mode Operation (9) Zero calibration signal value and span calibration signal value (a) This function is mainly used for technical service. Do not operate this function unless otherwise required. 【IMPORTANT】 • If the setting value is changed when not necessary, correct measured values will not be obtained.
  • Page 59 Model: OBM-162A 3.3 Setting Mode Operation (10) 25°C saturation current value The 25°C saturation current values for dissolved oxygen electrode to be combined are shown in the table below. These values differ for each model name. If the 25°C saturation current value differs from the following values such as when the operation is started or when the electrode is changed to another model, set the value again using the procedure shown below.
  • Page 60 Model: OBM-162A 3.3 Setting Mode Operation (11) Indication item for calibration (a) One of the 3 types of indication items to be used at the time of calibration can be selected. (b) Normally select DO indication calibration (do). Change the selection if necessary.
  • Page 61 Model: OBM-162A 3.3 Setting Mode Operation (12) Calibration mode (a) For calibration mode, automatic and manual modes are provided and either one can be selected. (b) If “AUTO (automatic calibration)” is set at this screen, the analyzer automatically determines whether zero or span calibration should be performed before performing calibration. If zero calibration is determined, “Zero calibration using zero solution”...
  • Page 62 Model: OBM-162A 3.3 Setting Mode Operation (13) Hold type (a) In the cases described in (b), the DO transmission output and the temperature transmission output become the pre-selected Hold type output. This is used to prevent the measured value error from disturbing the control system.
  • Page 63 Model: OBM-162A 3.3 Setting Mode Operation (Continued from previous page) Procedure and screen example Operation ④ Change the dummy value. Change the blinking number on the main display and ···································· then press 12.00 • Main display ⋅⋅⋅⋅ Dummy value (mA) To increase/decrease the number ⋅⋅⋅⋅...
  • Page 64 Model: OBM-162A 3.3 Setting Mode Operation (15) Stability check for calibration (a) Stability check for calibration is the function to automatically determine that the measured value is stabilized at the time of DO calibration and then takes in the calibration value. Valid/invalid for this function can be selected..
  • Page 65 Model: OBM-162A 3.3 Setting Mode Operation (16) Impressed voltage This function is mainly used for technical service. Do not operate this function unless otherwise required. 【IMPORTANT】 • If the setting value is changed when not necessary, correct measured values will not be obtained.
  • Page 66 Model: OBM-162A 3.3 Setting Mode Operation (17) Manual temperature compensation (a) Normally, “temperature compensation for sample water and electrode” is automatically carried out using the measured value by the temperature element of the electrode. When electrode without a temperature element (for fermentation, etc.) is used, or when electrode of temperature element other than 10kΩ/25°C (thermistor) is used, temperature compensation can be carried out by...
  • Page 67 Model: OBM-162A 3.3 Setting Mode Operation Operation Procedure Procedure and screen example Operation ① Select the “Setting Mode DO Measured Value” Press for 3 seconds or more in the ····· screen. measurement mode. • “ST-BY” lights. ② Select the setting screen.
  • Page 68 Model: OBM-162A 3.3 Setting Mode Operation (18) Date and time (clock adjustment) (a) The current date and time of the clock built into the product can be adjusted. The built-in clock is used for recording the calibration date/time as calibration history and for clock display.
  • Page 69 Model: OBM-162A 3.3 Setting Mode Operation (19) Measurement mode automatic return (a) When 2 hours passes after the mode is changed from the measurement mode to the setting mode, the mode automatically returns to the measurement mode. This function complements the analyzer so that the mode returns to the measurement mode without fail.
  • Page 70 Model: OBM-162A 3.3 Setting Mode Operation (20) Saturated dissolved oxygen concentration (a) The saturated dissolved oxygen concentration can be selected from either of the followings. • 8.11mg/L(25ºC) · JIS standards value (old) • 8.26mg/L(25ºC) · JIS standards value (new) 【IMPORTANT】 • After the saturated dissolved oxygen concentration is changed, always perform the calibration.
  • Page 71 Model: OBM-162A Transmission Adjustment Mode Operation 3.4 Transmission Adjustment Mode Operation (1) DO transmission output (a) This function is mainly used for technical service. Do not operate this function unless otherwise required. 【IMPORTANT】 • If the setting values are changed when not necessary, correct measured values will not be obtained.
  • Page 72 Model: OBM-162A Transmission Adjustment Mode Operation (2) Temperature transmission output (a) This function is mainly used for technical service. Do not operate this function unless otherwise required. 【IMPORTANT】 • If the setting values are changed when not necessary, correct measured values will not be obtained.
  • Page 73 Model: OBM-162A 4.1 Maintenance List 4. Maintenance 4.1 Maintenance List (a) To operate the product correctly at all times and maintain its specified performance, it is necessary for you to thoroughly understand its function and perform maintenance periodically. 【IMPORTANT】 • Operating the product without performing maintenance periodically can result in a failure.
  • Page 74 Model: OBM-162A 4.2 Spare Parts / 4 .3 Operation Check Using Equivalent Input 4.2 Spare Parts • Dissolved oxygen electrode of the same model as the one being used Model 7533L, Model 7536L, Model 7540L, etc. • Sodium sulfite (Sulfite of soda) ⋅⋅⋅⋅⋅⋅ When zero calibration is performed using zero solution 〔NOTE〕...
  • Page 75 Model: OBM-162A 4.3 Operation Check Using Equivalent Input ① Preparation • Standard voltage generator (the one that can generate 0 to 5V) • Digital multimeter (internal resistance 10Ω or less, current measuring range is used) • 10kΩ fixed resistor • 1MΩ fixed resistor Electric Shock Do not touch the terminal board in the analyzer while power is applied.
  • Page 76 Model: OBM-162A 4.3 Operation Check Using Equivalent Input Start zero calibration. ⋅⋅⋅⋅⋅⋅ Press once. • “CAL” and “WAIT” blink and zero calibration starts. When calibration ends, “CAL” lights and “WAIT” turns off. Set the output value of standard voltage generator. ⋅⋅⋅⋅⋅⋅ Set the output value obtained in the following equation to the standard voltage generator.
  • Page 77 Model: OBM-162A 4.3 Operation Check Using Equivalent Input ⑦ Return to the original state. ⋅⋅⋅⋅⋅⋅ If no error occurs, turn off the power to the analyzer and remove all the wiring of the devices connected in step ③ and connect the lead wires in the same way as before and close the door of the analyzer.
  • Page 78 Model: OBM-162A 5.1 Error message 5. Troubleshooting 5.1 Error message (1) Error messages for calibration and necessary actions (a) When measurement is continued, the characteristic of the DO electrode changes gradually by contaminants and chemical reactions. By performing calibration, correct measurement can be continued.
  • Page 79 Model: OBM-162A 5.1 Error message (a) Zero calibration cannot be made (E-01) If zero calibration is performed with its result out of the range of design standard by ±50nA, an error message “E-01” appears. at 25 Input current ( A) 0.05...
  • Page 80 Model: OBM-162A 5.1 Error message (2) Other error messages and necessary actions Other Error Messages and Necessary Actions Item Indication Message name and contents Actions, etc. • Set the DO measuring range [Overflowed] or [Underflowed] 50.30 again. • Blinking of the value on the main display •...
  • Page 81 Model: OBM-162A 5.1 Error message (Continued from previous page) Item Indication Message name and contents Actions, etc. • Take measures to set the [Temperature measured value error] E-04 temperature of sample water to • This indicates that the temperature of within the range of 0.0 to 50.0...
  • Page 82 Model: OBM-162A 5.2 Troubleshooting Flowchart 5.2 Troubleshooting Flowchart After performing calibration, Error Inspect the electrode. 5.1(1) “Error messages for ＞＞ message E-01 to E-03 appears. calibration and necessary actions” Error message E-20 appears If the analyzer does not return to normal when power is turned on again, contact DKK-TOA.
  • Page 83 Model: OBM-162A 5.3 Measures against Noise 5.3 Measures against Noise (a) Error symptom due to noise If a strong noise source exists near this DO measurement system, the following symptoms may occur. This controller has an effective anti-noise characteristic for ±1500Vp-p (peak-to-peak voltage) but if a peripheral device exists that generates strong noise exceeding this level, any of the following symptoms occurs.
  • Page 84 Model: OBM-162A 6.1 Specifications 6. Specifications and Description 6.1 Specifications (a) Basic items Product name : Dissolved Oxygen Analyzer Model : OBM-162A Measuring object : Dissolved oxygen value (DO) in water, Oxygen value (O ) in the air, Dissolved oxygen saturation ratio (SAT) in water,...
  • Page 85 Model: OBM-162A 6.1 Specifications Power consumption : Approx. 10VA : Number of circuits ⋅⋅⋅⋅ 4-circuit Alarm output Output contacts ⋅⋅⋅⋅ 3-circuit make contacts (NO contacts) 1-circuit transfer contacts (CO contacts) Output contact capacity ⋅⋅⋅⋅ 250VAC, 3A 30VDC 3A (resistance load) Output function ⋅⋅⋅⋅...
  • Page 86 Model: OBM-162A 6.1 Specifications Display section and key operation section ⋅⋅⋅⋅⋅⋅ polyester resin : Main body ⋅⋅⋅⋅ Metallic silver Surface color Display section and key operation section ⋅⋅⋅⋅ Munsell N1.5 Mass : Approx. 2kg (d) Function Calibration method : Zero calibration ···· Electrical method to turn off the electrode...
  • Page 87 Model: OBM-162A 6.2 Key Points of Dissolved Oxygen Measurement 6.2 Key Points of Dissolved Oxygen Measurement Key points of dissolved oxygen measurement such as the characteristics of a dissolved oxygen meter and the nature of dissolved oxygen. (1) Factors that influence the measurement The factors that influence the measurement are temperature, pressure, flow rate and the composition of sample water.
  • Page 88 Model: OBM-162A 6.2 Key Points of Dissolved Oxygen Measurement (2) Amount of saturated dissolved oxygen in water Table 1 When saturated dissolved oxygen concentration 8.11mg/L is set (in water vapor-saturated air with atmospheric pressure 0.1MPa (absolute pressure) {760mmHg} and oxygen 20.9%)
  • Page 89 Model: OBM-162A 6.2 Key Points of Dissolved Oxygen Measurement Table 2 When the saturated dissolved oxygen concentration 8.26mg/L is set Dissolved oxygen (mg/L) Temperature Practical salinity (Salinity) (ºC) 14.62 13.73 12.89 12.11 11.37 14.22 13.36 12.55 11.79 11.08 13.83 13.00 12.22...
  • Page 90 Model: OBM-162A 6.2 Key Points of Dissolved Oxygen Measurement (3) Measurement of sample water containing salt (a) Chlorine ion concentration and DO meter indication Generally speaking, when sample water contains plenty of salt, solubility of oxygen decreases compared with that of pure water. For this reason, correction is necessary for sample water containing plenty of salt (such as sea water).
  • Page 91 Model: OBM-162A 6.2 Key Points of Dissolved Oxygen Measurement For example, if the chlorine ion concentration reaches 20,000mg/L (practical salinity 36 or equivalent), the amount of saturated dissolved oxygen decreases to 6.52mg/L. However, DO meter indication does not decrease and still indicates 8.11mg/L. This is because the oxygen partial pressure is still 21% corresponding to the amount of saturated dissolved oxygen 6.52mg/L in water containing...
  • Page 92 Model: OBM-162A 6.2 Key Points of Dissolved Oxygen Measurement Example of saturated dissolved oxygen concentration 8.11mg/L calibration: 6.52 4.00 × = 3.22 (mg/L) 8.11 Example of saturated dissolved oxygen concentration 8.26mg/L calibration: 6.73 4.00 × = 3.26 (mg/L) 8.26 If the indicated value is stable, dissolved oxygen concentration can be read directly by 〔NOTE〕...
  • Page 93 Model: OBM-162A 7. RS-232C Communication Function (Option) 7. RS-232C Communication Function (Option) (1) Outline and specifications of RS-232C communication function (a) When the analyzer is equipped with RS-232C connector (option), the analyzer can be connected with a PC using a communication cable. The digital measured value can be imported to PC by connecting the analyzer with PC.
  • Page 94 Model: OBM-162A 7. RS-232C Communication Function (Option) Connector (D-sub 9-in. female) RS-232C communication terminals RD(RXD) RD(RXD) SD(TXD) SD(TXD) Analyzer side *The terminals on the PC side shown below are short-circuited. 　 4-6 pins 　 7-8 pins PC side Configuration of Communication Cable...
  • Page 95 Model: OBM-162A 7. RS-232C Communication Function (Option) CR : ASCII code 0DH I CR LF LF : ASCII code 0AH End code Request code Command Format from PC (b) Analyzer response (I) Responding to a request from PC, the analyzer sends data in the format below.
  • Page 96 Model: OBM-162A 8.1 Analyzer Mounting 8. Installation 8.1 Analyzer Mounting (1) Installation location Install the analyzer a location which conforms to the specifications and satisfies the following conditions. (a) A location where the lead wires of the sensor, etc. can reach.
  • Page 97 Model: OBM-162A 8.1 Analyzer Mounting Set screw Mounting fixture 50A pipe ( 60.5), etc. Analyzer Pipe Mounting Method Plate Fixing bolt Set screw Wall mounting plate (option) 4- 5.8, etc. 82 0.2 Analyzer Unit: mm Wall Mounting Method Hole Positions of Wall Mounting Plate...
  • Page 98 Model: OBM-162A 8.1 Analyzer Mounting (17) 50A pipe ( 60.5), etc. Cable port (six locations) Inside pressure (Cable gland for 6 to 12) regulating valve Ground terminal (M4) Unit: mm Dimensions - 97 -...
  • Page 99 Model: OBM-162A 8.2 Wire Connection 8.2 Wire Connection (1) Wire Connection Diagram Electric Shock Do not touch the terminals inside the product while power is applied. Touching the terminals may cause electric shock. Connector box Extension cable Analyzer Electrode Analyzer...
  • Page 100 Model: OBM-162A 8.2 Wire Connection Electrode lead Analyzer wires DO transmission output terminals 1 P(K) 2 N(A) Receiving device 3 A1 4 B1 Temperature transmission output terminals Receiving device Wash-in-progress input terminals Sensor with wash function (with internal timer) Power input terminals...
  • Page 101 Model: OBM-162A 8.2 Wire Connection (2) Cable ports Install each cable to the inside of the analyzer by putting it through a cable gland (for φ6 to 12) of cable ports at the bottom of the analyzer. 【IMPORTANT】 • Use a cable with outer diameter fit for the size of the cable gland. If it is...
  • Page 102 Model: OBM-162A 8.2 Wire Connection (3) Terminal diagram of external input/output (a) Check that the power supply to the analyzer is off, open the terminal door of the analyzer and remove the terminal cover and then connect wires to each terminal. When wiring is completed, install the terminal cover in the same was as before.
  • Page 103 Model: OBM-162A 8.2 Wire Connection Input terminals Temperature element Cathode electrode DO transmission Shield Anode output terminals electrode Model ELW-032 cable is used Temperature transmission Wash-in-progress output terminals input terminals Type A and B Power off or electrode error signal...
  • Page 104 Model: OBM-162A 8.2 Wire Connection (4) Electrode lead wires (a) Do not secure the electrode lead wires near the sensor. 【IMPORTANT】 • Since the sensor may be lifted for the purpose of maintenance, do not secure the electrode lead wires near the sensor. If the wires are secured completely such as using metal conduit, maintenance may be difficult to perform.
  • Page 105 Model: OBM-162A 8.2 Wire Connection (7) Power input terminals (a) Power supply of this analyzer is 100to240VAC±10%. Connect a 2-core cable to the terminals 90 and 91 of the terminal plate. However, when power supply output for wash is needed, power supply must be 100VAC ±10%.
  • Page 106 Model: OBM-162A 8.2 Wire Connection Analyzer inside Analyzer outside Contact protection spark killer Pulse voltage eliminating spark killer Relay contact Solenoid valve, electromagnetic switch, etc. (Inductive load) Drive power supply for solenoid valves, etc. Example of Protection against Noise for Alarm Circuits (c) If an alarm condition occurs, the contact of the alarm output terminals closes and if the DO measured value returns to within the alarm set points, the contact opens.
  • Page 107 Model: OBM-162A 8.2 Wire Connection (12) Power output terminals for wash (a) When the analyzer is equipped with wash control function (option), as soon as the preset wash time comes, AC power for the sensor with wash function will be output from the power output terminals for wash (80 and 81).
  • Page 108 Model: OBM-162A 8.2 Wire Connection Wash-in-progress input terminals Terminal assignment may differ depending on the model. Sensor with wash function (with built-in timer) 100VAC±10% 100 to 240VAC±10% Connection of “Wash in progress” Signal Input Cable - 107 -...
  • Page 109 Model: OBM-162A 8.3 Extension by Cable 8.3 Extension by Cable (Option, except broken diaphragm detection specification) When the analyzer must be installed at a place the electrode lead wire (standard: 5m) cannot reach, extend the lead wire by using the attached cable (extension cable) and connector box according to the order specifications.
  • Page 110 Model: OBM-162A 8.3 Extension by Cable (2) Connector box Cover Remove the cover Terminal block for Terminal block for extension cable electrode lead wire Wiring port for extension cable Wiring port for Ground terminal electrode lead wire Type D ground...
  • Page 111 Model: OBM-162A 8.3 Extension by Cable (e) When the taper packing for electrode has three holes, remove the rubber film of the hole matched to the thickness of the electrode lead wire and pass the lead wire through that hole.
  • Page 112 Head Office Address: 29-10, 1-Chome, Takadanobaba, Shinjuku-Ku, Tokyo, 169-8648 Japan Telephone: +81-3-3202-0225 Facsimile: +81-3-3202-5685 URL http://www.toadkk.co.jp/...