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Nivetec AquaSensors AV38 User Manual

Local display and controller
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Thermo Scientific AquaSensors
™
AV38 Local Display
and Controller
User Guide

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Summary of Contents for Nivetec AquaSensors AV38

  • Page 1 Thermo Scientific AquaSensors ™ AV38 Local Display and Controller User Guide...
  • Page 2 Preface This instruction manual serves to explain the use of the Thermo Scientific AquaSensors AV38 Local Display and is written to cover as many applications as possible. Please do not hesitate to contact Thermo Fisher Scientific or an authorized representative with questions or concerns.
  • Page 3 Safety Information The Thermo Scientific AquaSensors AV38 Local Display shall be installed and operated only in the manner specified. Only a skilled, trained or authorized person should carry out installation, setup and operation of the sensor system. Before using the display, make sure that the sensor cable is connected as specified.

  • Page 4: Table Of Contents

    TABLE OF CONTENTS INTRODUCTION..........................6 1.1..........................6 ENERAL NFORMATION 1.2..............................7 NTENDED USE PRODUCT DESCRIPTION ......................8 2.1............................8 YSTEM VERVIEW 2.2............................9 UMBERS 2.3.............................9 ENSOR APPING 2.4..............................10 OUNTING 2.5................................13 IRING 2.6........................18 EASURE CREEN VERVIEW MENU STRUCTURE AND NAVIGATION.................. 21 CALIBRATE MENUS ........................
  • Page 5 RELAYS ............................69 12.1........................70 ONTROL ELAY CTIVATION 12.2..........................71 LARM ELAY CTIVATION 12.3..........................72 ELAY CTIVATION DIAGNOSE MENU .......................... 74 HELP MENU ............................ 75 RESET AV38............................. 75 LIMITED WARRANTY........................76 TERMS AND CONDITIONS......................77 ™ Thermo Scientific AquaSensors AV38 Local Display and Controller User Guide...
  • Page 6 TABLE OF FIGURES Figure 1: The elements of the AV38 user interface....................18 Figure 2: The "H" indicates that hold mode is active..................... 19 Figure 3: The initial measure screen when the DataStick is absent................ 20 Figure 4: The initial measure screen when the Sensor Head is absent..............20 Figure 5: The complete calibrate menu for pH sensors.

  • Page 7: Introduction

    1. INTRODUCTION 1.1. General Information Thank you for purchasing the Thermo Scientific AquaSensors AV38 Local Display. The product is designed for continuous use in industrial process applications and complies with safety regulations currently in force. Improper use could lead to hazards for the user or a third-party, and/or adverse effects to the plant or other equipment.

  • Page 8: Intended Use

    1.2. Intended use The Thermo Scientific AquaSensors AV38 Local Display is used to monitor, configure, calibrate and diagnose any DataStick measurement system configured with a Modbus communications adapter in accordance with the technical product specifications in Section 2 of this manual.

  • Page 9: Product Description

    2. PRODUCT DESCRIPTION 2.1. System Overview The AV38 is a universal display interface for DataStick measurement systems. The enclosure has ¼-DIN dimensions for easy mounting and is rated NEMA 4X for outdoor use. It uses a liquid crystal display (LCD) with a high-contrast backlight for best readability and is powered with 24 volts DC.

  • Page 10: Base Part Numbers

    When there is no DataStick present at the selected station address, the measure screen will indicate that the DataStick is absent. When the sensor head is removed from the DataStick, the measure screen will indicate that the sensor head is absent. Host communication options include, Modbus, DeviceNet, and others.

  • Page 11: Mounting

    2.4. Mounting The AV38 can be mounted on a wall or panel mounted in ¼-DIN or ½-DIN forms. A gasket is built into the display for a NEMA 4X seal. Mounting instructions must be followed to maintain seals. The AV38 can be pipe mounted and panel mounted with optional mounting hardware.
  • Page 12 2.4.2. ½-DIN Panel Mount (PN: AV38-1/2DIN) A ½-DIN panel-mount bezel and gasket can be ordered to fit the AV38 as shown. The AV38 display is tightened down to the bezel using the four captured screws in the AV38. The bezel is then mounted to a ½-DIN square opening with the hardware shown in the figure below.
  • Page 13 2.4.3. ¼-DIN Panel Mount (PN: AV38-1/4DIN) The AV38 Display can be mounted directly to a ¼-DIN panel opening using the captive mounting screws in the AV38 and the ¼-DIN supports as illustrated in the figure below. A ¼-DIN bezel gasket can be provided to ensure a NEMA 4X seal on the panel.

  • Page 14: Wiring

    2.5. Wiring DC-Powered Version (AV38-XBXXX1) The DC-powered AV38 Display comes with two terminal blocks when ordered with one or two 4-20mA analog outputs and/or host communications. If relays are ordered, a third terminal block is present. The figure below shows an AV38 with the DeviceNet host communications option present. DC-powered AV38 with DeviceNet host comms wiring The current loops (analog outputs) should be wired as follows:...
  • Page 15 The cable from the DataStick should be wired as follows: Terminal DC-Powered AV38 with DeviceNet Wiring Red wire from DataStick Black wire from DataStick White wire from DataStick Blue wire from DataStick Clear wire from DataStick The DeviceNet cable from the host should be wired as follows: Terminal DC-Powered AV38 with DeviceNet Wiring Ground from DeviceNet Power Supply (Black)
  • Page 16 DC-Powered Legacy Version (AV38-XBXXX) The DC-powered legacy version of the AV38 Display comes with a single terminal block when ordered with one 4-20mA analog output and/or host communications. If a second analog output or relays are ordered, a second terminal block is present. AV38 Terminals: 1 Output and Host Comms AV38 Terminals: 2 Outputs and Relays Figure 2.1: AV38 Wiring...
  • Page 17 The DC-powered AV38 wiring will vary depending on the options provided. Model AV38-BB0A1: One 4-20mA Analog Output, No Relays and No Host Comms Terminal DC-Powered AV38 Wiring 24 VDC from Power Supply Ground from Power Supply No connect No connect Earth Ground from Power Supply Red wire from DataStick Black wire from DataStick...
  • Page 18 AC-Powered (AV38-XBXXX2) The AC-powered AV38 Display comes with two terminal blocks when ordered with one or two 4-20 mA analog outputs and/or host communications. If relays are ordered, a third terminal block is present. AC-powered AV38 wiring: 1. Analog Outputs 1 and 2 are wired to Pins 1, 2 and 3 as shown above. 2.

  • Page 19: Measure Screen Overview

    The AC-powered AV38 wiring will vary depending on the options provided. Model AV38-CB0C2: Two 4-20mA Analog Outputs, two Relays and No Host Comms Terminal AC-Powered AV38 Wiring Current Loop 1 + (Power provided by AV38) Current Loop – Current Loop 2 + (Power provided by AV38) Red wire from DataStick Black wire from DataStick White wire from DataStick...

  • Page 20: Figure 2: The "H" Indicates That Hold Mode Is Active

    The sensor measurement is displayed on the top line and the temperature measurement is displayed on the bottom line. The “AB” indicators on the top right indicate activation of relays A and B. An underscore indicates that the corresponding relay is not activated. The “DS1: 6” indicates that Channel 1 is connected to the DataStick with a Modbus address of 6.

  • Page 21: Figure 3: The Initial Measure Screen When The Datastick Is Absent

    When the DataStick is absent the display will read “DataStick Absent” as shown in Figure 3 . If the sensor is wired correctly and the “DataStick Absent” message appears, be sure that the DataStick Sensor has the correct station number as indicated by the number in the lower right corner of the measure screen. If that is correct, also check that baud rate and parity are set up correctly in the DataStick.

  • Page 22: Menu Structure And Navigation

    3. MENU STRUCTURE AND NAVIGATION The Main Menu is accessed by pressing the MENU key when the AV38 is in Analyzer Mode (measure screen). The menu structure is navigated using ENTER, UP/DOWN arrows, and ESC keys. Use the UP/DOWN arrow keys to scroll through the list of Menu options. Use the ENTER key to select an option.
  • Page 23 MAIN MENU NAVIGATION Enter the Main Menu by pressing the MENU key. Scroll the listing with the UP/DOWN arrow keys. To select an item, press the ENTER key. If there is no keypad activity for 15 minutes and the display is left on a menu screen, the measure screen will automatically re-appear.
  • Page 24 Select Chlorine Config with the ENTER Key ≡Main Menu ►Chlorine Config Set Measurement: Free chlorine or HOCL Set pH Source: Fixed or active Set Fixed pH Value MENU ENTER ◄ ► Press the DOWN Arrow for next selection. ▼ Select Hold Outputs with the ENTER key ≡Main Menu ►Hold Outputs Put outputs and relays on hold.
  • Page 25 Select PID CONTROLLER with the ENTER key ≡Main Menu ► PID Controller To set up ISA or Velocity Algorithm, Full-Scale, Zero-Scale, Setpoint, Proportion Gain, Integral ▲ Gain, Derivative Gain, Transit time, manual reset MENU ENTER ◄ ► and manual mode. (Standard function with pH or conductivity sensors) ▼...
  • Page 26 Select HELP with the ENTER key ≡Main Menu ►Help To read the AV38 firmware version. ▲ Press the DOWN ARROW for next selection. MENU ENTER ◄ ► ▼ Select Reset AV38 with the ENTER key ≡Main Menu ►Reset AV38 Set output, PID and relay functions to default values.

  • Page 27: Calibrate Menus

    4. CALIBRATE MENUS Calibration methods supported in the AV38 are automatically available depending on the sensor head connected to the DataStick. The supported calibration methods are listed below: Table 3: Calibration methods. Calibration Method Description Sensors Supported 1-Point Sample Set measured reading to desired reading. Changes offset.

  • Page 28: Figure 5: The Complete Calibrate Menu For Ph Sensors

    For pH sensors, calibration methods are: 1-point Buffer, 2-Point Buffer, 1-Point Sample, 2-Point Sample and Temperature as shown in Figure 5 ≡Calibrate ►1-Point Buffer ►2-Point Buffer ►1-Point Sample ►2-Point Sample ▲ ►Temperature ◄Exit MENU ENTER ◄ ► ▼ Figure 5: The complete calibrate menu for pH sensors. For Dissolved Oxygen Sensors, calibration methods are: Air, 1-Point Sample and Temperature as shown in Figure 6 .

  • Page 29: 1-Point Buffer Calibration (Sensor Type: Ph)

    4.1. 1-Point Buffer Calibration (Sensor Type: pH) Find the 1-Point Buffer calibration in the CALIBRATE menu using the UP/DOWN arrows. Press ENTER to initiate this calibration process. Once the calibration has been initiated it can be aborted by pressing the escape key before the process is completed.
  • Page 30 After the calibration point has been stored, the user is prompted to confirm a successful calibration procedure. 1-Point Buffer Confirm cal OK ▲ MENU ENTER ◄ ► ▼ When the enter key is pressed to acknowledge that the calibration was successful, the analog output is placed into active mode and the monitoring of sensor and temperature values is resumed.

  • Page 31: 2-Point Buffer Calibration (Sensor Type: Ph)

    When the enter key is pressed, the calibrate menu is displayed. The analog output remains in hold mode. This ends the 1-Point Buffer calibration procedure. The user has the option of repeating the procedure if desired. ≡Calibrate ►1-Point Buffer ▲ MENU ENTER ◄...
  • Page 32 2-Point Buffer Calibrating... ▲ MENU ENTER ◄ ► ▼ It takes between 5 seconds and two minutes depending on sensor and temperature measurement stability. Once the calibration has been initiated it can be aborted by pressing the escape key before the process is completed.
  • Page 33 When the enter key is pressed to acknowledge that the calibration was successful, the analog output is placed into active mode and the monitoring of sensor and temperature values is resumed. This successfully completes the 2-point buffer calibration procedure. 7.01 pH 25.2 °C DS1: ▲...

  • Page 34: Aborted Calibration (Sensor Type: All)

    4.3. Aborted Calibration (Sensor Type: All) If the ESC key is pressed while calibration is in progress, the procedure is aborted. A calibration cannot be aborted if the calibration process has completed. 2-Point Buffer Calibrating... ▲ MENU ENTER ◄ ► ▼...

  • Page 35: 1-Point Sample Calibration (Sensor Type: All)

    4.4. 1-Point Sample Calibration (Sensor Type: All) The screen-by-screen example for a 1-point sample calibration is given for a conductivity sensor in this section. The same sequence is followed for any sensor type. Only the units of measure and range of acceptable values will change.

  • Page 36: Figure 10: Dynamic Display Of The Conductivity Value During Calibration

    The sensor value is dynamically displayed at this point in the calibration procedure as shown in Figure 10 When the reading has stabilized, press ENTER to initiate the calibration. 991.3 µS/cm Sensor ready? ▲ MENU ENTER ◄ ► ▼ Figure 10: Dynamic display of the conductivity value during calibration. When the user presses enter, the current sensor value is captured and shown in the edit field of the next screen as shown in Figure 11 1-Point Sample?

  • Page 37: 2-Point Sample Calibrate (Sensor Type: Ph)

    1000 µS/cm 30.8 °C DS1: ▲ MENU ENTER ◄ ► ▼ If an error occurs during calibration, the reason for the failure is shown. 1-Point Sample Not stable ▲ MENU ENTER ◄ ► ▼ 4.5. 2-Point Sample Calibrate (Sensor Type: pH) Press MENU from the Measure Screen: 4.07 pH 30.8 °C...

  • Page 38: Figure 13: Dynamic Display Of The Ph Value During Calibration

    Find the 2-Point Sample calibration in the CALIBRATE menu using the UP/DOWN arrows. Press ENTER to initiate this calibration process. Once the calibration has been initiated it can be aborted by pressing the escape key before the process is completed. ≡Calibrate ►2-Point Sample ►Temperature...

  • Page 39: Figure 15: Entering The Ph Calibration Value

    The calibration value can be adjusted with the UP and DOWN arrow keys. After the calibration value is adjusted, the enter key is pressed to calibrate the DataStick as shown in Figure 15 1-Point Sample? ( 4.00) pH ▲ MENU ENTER ◄...

  • Page 40: Zero Calibrate (Sensor Type: Conductivity, Do, Ozone, Drinking Water Turbidity, Raw Water Turbidity, Suspended Solids)

    When the enter key is pressed to acknowledge that the calibration was successful, the analog output is placed into active mode and the monitoring of sensor and temperature values is resumed. This successfully completes the 2-point sample calibration procedure. 7.00 pH 30.8 °C DS1: ▲...

  • Page 41: Figure 17: Zero Is Calibrating

    A zero calibration may take some time, as the zero must be calibrated over a wide dynamic range. During this process the Calibrating… message is shown in Figure 17. Zero Calibrating... ▲ MENU ENTER ◄ ► ▼ Figure 17: Zero is Calibrating…. When the zero calibration is complete the user will be asked to confirm the result with the ENTER key.

  • Page 42: Air Calibration (Sensor Type: Dissolved Oxygen)

    Press ENTER to acknowledge the calibration failure and return to the measure screen. 0.005 µS/cm 13.1 °C DS1: ▲ MENU ENTER ◄ ► ▼ 4.7. Air Calibration (Sensor Type: Dissolved Oxygen) An AIR CALIBRATION computes the oxygen content measured in air based on the setting for PRESSURE, SALINITY and the measured temperature.
  • Page 43 It takes between 5 seconds and two minutes depending on sensor and temperature measurement stability. During this time, the calibration procedure can be aborted by pressing the escape key. See Section 4.3 for an example of an aborted calibration procedure. After the air calibration point has been stored, the user is prompted to confirm a successful calibration procedure.

  • Page 44: Temperature 1-Point Sample Calibration

    When the enter key is pressed, the calibrate menu is displayed. The analog output remains in hold mode. This ends the air calibration procedure. The user has the option of repeating the procedure if desired. ≡Calibrate ►Air ▲ MENU ENTER ◄...
  • Page 45 When the value has been edited as desired, the enter key is pressed and the calibration of the point is started. Temperature? ( 25.0) °C ▲ MENU ENTER ◄ ► ▼ During this time, the calibration procedure can be aborted by pressing the escape key. See Section 4.3 for examples of an aborted calibration procedure.
  • Page 46 If an error occurs during calibration that causes the procedure to fail, the reason for the failure will be shown. Temperature Calibrating... ▲ MENU ENTER ◄ ► ▼ Temperature Offset too high ▲ MENU ENTER ◄ ► ▼ When the enter key is pressed, the calibrate menu is displayed. This ends the temperature calibration procedure.

  • Page 47: Configure Menu

    CONFIGURE MENU The configuration menu allows viewing and editing of sensor constants and will depend on the type of sensor head that is installed in the DataStick. Table 4: The Configure menu. Configuration Type Function Sensors Supported Sensor Filter Filter main parameter in seconds. Set zero seconds for no filter.

  • Page 48: Main Configure Menus

    5.1. Main Configure Menus Configure menus dynamically change depending on the DataStick sensor type connected. Generally, all configure screens allow viewing and editing values in parentheses. Examples of top-level menus for conductivity, pH, DO and Turbidity are shown below. The complete configure menu for Conductivity is shown in Figure 20 ≡Configure ►Sensor Filter ►Sensor Units...

  • Page 49: Navigating Sensor Filter Configuration

    5.2. Navigating Sensor Filter Configuration The following sequence shows how the sensor filter configuration is viewed and set. The gray key is pressed to move to the next screen. This sequence is an example for all configuration menus. From the Measure Screen, Press the MENU key: 991.3 µS/cm 30.8 °C DS1:...
  • Page 50 Select SENSOR FILTER using the ENTER key: ≡Configure ►Sensor Filter ▲ MENU ENTER ◄ ► ▼ Use the UP and DOWN arrow keys to change the number in parentheses to the desired sensor filter (in seconds): Sensor Filter? 1) s ▲...

  • Page 51: Navigating The User-Entered Concentration Table Screens

    Observe the response time of the measurement. The temperature filter should also be changed to the same filter value. 991.3 µS/cm 30.8 °C DS1: ▲ MENU ENTER ◄ ► ▼ 5.3. Navigating the User-Entered Concentration Table Screens The DataStick can convert measured conductivity into % concentration based on a 10-point user-entered concentration table.

  • Page 52: Table 6: Record The Table Values Here Before Entering Them

    Note: The coordinate values of 0 µS/cm and 0% in point 5 indicate the end of the table. Because point 5 is the end of the table, points 6-10 are ignored. • The conductivity coord inates must be monotonic over the range of intere st and increasing in value and be between 0 and 2,000,000 µS/cm.
  • Page 53 Entering the Concentration Table The concentration table editing screen can be reached by navigating to the Con figure menu, scrolling down to the Conc Table item, and then pressing Enter. ≡Configure ►Conc Table ▲ MENU ENTER ◄ ► ▼ When the Conc Table screen is first entered, all ten points in the table are read. While the points are being read, the screen counts down from 10 to 1.
  • Page 54 To view the second point in the table, press the DOWN arrow key. Point 2 Y Data < 99.99% ▲ MENU ENTER ◄ ► ▼ All of the points in the table can be reviewed by using the UP, DOWN, LEFT, and RIGHT arrow keys. To edit a coordinate, navigate to the desired coordinate using the UP, DOWN, LEFT, and R IGHT arrow keys and press ENTER.
  • Page 55 Press ENTER to exit the table or press ESC to return to the table to do more editing. If ENTER is pressed and one or more points have been changed, you will be prompted to save the changes. Conc Table Save changes? ▲...

  • Page 56: Table 7: Summary Of Key Actions

    A summary of the actions of the various keys for the viewing and editing modes is shown in Table 7. Table 7: Summary of key actions. Mode Action Press Scroll X and Y LEFT and RIGHT arrow Scroll point UP and DOWN arrow Viewing Edit coordinate ENTER...

  • Page 57: Host Communications

    HOST COMMUNICATIONS The AV38 can be set up to comm unicate with a Host Computer system . The protocol selected is independent of the Modbus protocol used by the AV to communica with the DataSt icks. When using Host Communications, please refer to the selected communicati ons manual fo specific protocol setup and use.

  • Page 58: Datastick Communications Setup

    DATASTICK COMMUNICATIONS SETUP Up to 247 DataSticks can be connected to a single AV38. Any two of them can be selected for local display analog output reporting and relay control. The DataStick st ation number that is selected is displayed in the lower right corner of the measure scre en.

  • Page 59: Setting Data Type

    Edit the Station number in parentheses using the UP and DOWN arrows. Select a new number with the ENTER key. To be sure that a new number is NOT selected, press the ESC key to leave the station number unchanged. The station number selected must match the n umber programmed into the Modbus Comms Adapter of the DataStick wired to the AV38.

  • Page 60: Setting Datastick Baud Rate

    7.3. Setting DataStick Baud Rate All DataSticks connected to the AV38 must be set up with the same Baud rate. To view or edit the current AV38 Baud rate setting, press ENTER on the SET BAUD screen as shown. The default setting is 19.2 kbps. ≡DataStick Comms ►Set Baud ▲...

  • Page 61: Chlorine Configuration Menu

    CHLORINE CONFIGURATION MENU When configuring an AV38 for Chlorine measurement, the chlorine DataStick can be connected to channel 1 (DS1) or channel 2 (DS2). If a pH DataStick is to be used for compensation, it must be connected to the other channel.
  • Page 62 The “Fixed pH Value” screen provides a way to set a fix ed pH value that can be used to calculate free chlorine from the HOCl measurement. This single fixed entry ca n be used when a pH DataStick is not present or when the process pH is tightly controlled to a known value.

  • Page 63: Hold Outputs Screen

    HOLD OUTPUTS SCREEN The HOLD OUTPUTS function is used when it is desired to hold the present values of the 4-20mA analog outputs, PID and relays for an extended period of time. This feature can be used during maintenance. There is no timeout feature for this function;...

  • Page 64: Analog Outputs

    10. ANALOG OUTPUTS Up to two 4 to 20 milliamp analog outputs are provided for traditional data reporting. The selectable feature s in the analog output menus are the same regardless of the type of sensor head that is installed in the DataStick. While the AV38 is being used to calibrate the DataStick, its analog outp ut is held at its present value.
  • Page 65 Use the ENTER key to configure the Analog Output of choice. In this example Analog Output 1 is shown. ≡Main Menu ►Analog Output 1 ▲ MENU ENTER ◄ ► ▼ Use the UP/DOWN arrows to scroll through the Analog Output configuration options of Set Parameter, Set 4 mA Value, Set 20 mA Value and Calibrate.

  • Page 66: Calibrating Analog Output Current

    10.2. Calibrating Analog Output Current To calibrate the analog outputs, find the CALIBRATE option with the UP/DOWN arrow keys in the Analog Output menu and press ENTER to select it. ≡Analog Output 1 ►Calibrate ▲ MENU ENTER ◄ ► ▼ Connect an ammeter in series with the load and Select 4 mA Point with the ENTER key.
  • Page 67 The ammeter should read exactly 20.00 mA. If not, adjust the value displayed on the meter using the AV38 UP/DOWN arrow keys. The number displayed in parentheses is in “counts” and should be within 20% of 12,500. Press ENTER to accept the value in parenthesis. Press ESC to leave the value unchanged. Cal 20 mA Point? (12440) ▲...

  • Page 68: Pid Controller Menu

    11. PID CONTROLLER MENU The PID Controller is present in the Main Menu list when a pH or conductivity DataStick is connected. Press ENTER to select PID CONTROLLER. ≡Main Menu ►PID Controller ▲ MENU ENTER ◄ ► ▼ Use the UP/DOWN arrows to scroll the list of PID Controller options for viewing and editing. ≡PID Controller ►Set Algorithm ►Set Input...

  • Page 69: Table 11: Pid Controller Functions For Conductivity

    Scroll through these configuration and tun ing options with UP/DOWN arrows. Press ENTER to select an option and view or edit the setting. Press ENTER to change setting or ESC to leave a setting unchanged. Note that the Manual Mode, the present pH value is displayed in the upper line of the screen and the Control Adjustment is made in the lower line.

  • Page 70: Relays

    12. RELAYS Two Form-C relays with normally open and normally closed contacts are available with the AV38. When relay A is energized or activated, an “A” will appear in the upper right corner of the measure display. If relay B is energized a “B”...

  • Page 71: Control Relay Activation

    7. Scroll with the UP/DOWN arrows to SET PARAMETER (unless Wash was selected). 8. Press ENTE R to select SET PARAMETER and use the UP/DOWN arrows to select SENSOR or TEMPERATURE to drive the relay. 9. Press ENTER to select Sensor or Temperature. Press ESC to leave the setting unchanged. 10.

  • Page 72: Alarm Relay Activation

    1 . 2 2. Alarm Relay Activation Selecting “Alarm” operates the relay in an alarm mode. Activation entries specific to an Alarm relay are: • Low Alarm -- Sets the value at which the relay will activate in response to decreasing measured value. •...

  • Page 73: Wash Relay Activation

    12.3. Wash Relay Activation A wash relay activates periodically for a specified length of time. It is assumed that the wash relay is connected to some kind of automatic cleaning apparatus attached to a DataStick. While a wash relay is activated, the analog outputs and relays are held because it is assumed that a DataStick is being washed and the sensor and temperature values are not valid.
  • Page 74 • The wash cycle is started if the Interval value is changed to a value greater than 0. • The wash cycle is stopped if the Interval value is changed to 0. • If the Duration is longer than the Interval, the wash relay will remain activated. •...

  • Page 75: Diagnose Menu

    DIAGNOSE MENU The diagnose menu displays diagnostic information about the DataStick measurement system. Enter the Menu with the MENU key. Scroll the menu options with the UP/DOWN arrows. The Diagnose menu is near the bottom of the list but appears only if a pH sensor head is installed in the DataStick body. ≡Main Menu ►Diagnose ▲...

  • Page 76: Help Menu

    HELP MENU The help menu displays the product name and the firmware version of the AV38. Enter the Menu with the MENU key. Scroll the menu options with the UP/DOWN arrows. The H elp menu is second to last. Press ENTER to select the HELP menu. ≡Main Menu ►Help ▲...

  • Page 77: Limited Warranty

    16. LIMITED WARRANTY AV38 WARRANTY/REPLACEMENT PLAN Thermo Fisher Scientific warrants its AV38 Local Display against material and workmanship defect for a period of one year from the date of shipment. In the event that a defect is discovered during the warranty period, Thermo Fisher Scientific agrees, at its option, to repair or replace the defective product.

  • Page 78: Terms And Conditions

    17. TERMS AND CONDITIONS Terms and Conditions of Sale The following terms and cond itions will be presumed acceptable unless ch anges are made in writing and accepted by both parties in a reasonable amount of time. Any standard or boilerplate terms and conditions supplied with a written purchase order will not be applicable unless accepted in writing by both parties.
  • Page 80 258479-001 Rev. A 01-09...

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