LTH Electronics MXD70 Series Configuration Manual
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LTH Electronics MXD70 Series Configuration Manual

Multi-parameter monitor
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MXD70 SERIES
Multi-parameter Monitor
Setpoints, Current Outputs,
And Digital Inputs
Configuration Guide

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Summary of Contents for LTH Electronics MXD70 Series

  • Page 1 MXD70 SERIES Multi-parameter Monitor Setpoints, Current Outputs, And Digital Inputs Configuration Guide...

  • Page 3: Preface

    Preface Product warranty The MXD70 Series has a warranty against defects in materials and workmanship for three years from the date of shipment. During this period LTH will, at its own discretion, either repair or replace products that prove to be defective. The associated software is provided ‘as is’...
  • Page 4 Preface Manufacturing Standards Electromagnetic compatibility This instrument has been designed to comply with the standards and regulations set down by the European EMC Directive 2004/108/EC using BS EN 61326: 2006 Safety This instrument has been designed to comply with the standards and regulations set down by the European Low Voltage Directive 2006/95/EC using BS EN 61010-1: 2001 Quality This instrument has been manufactured under the following quality standard:...

  • Page 5: Table Of Contents

    Contents Contents Preface.........................1 Contents ........................3 Setpoints ........................5 Input Source......................6 Trigger........................6 Mode........................9 Hysteresis......................10 Setpoint Dose Alarm..................11 Setpoint Proportional Mode..............14 Setpoint Alarm Mode ................... 16 Setpoint Cleaning Mode ................17 Current Outputs ....................21 Current Output Calibration................ 24 Resetting the current Output user Calibration........26 Digital Inputs ......................
  • Page 6 Contents Blank MXD70 Setpoints, Current Outputs, and - 4 - Digital Inputs Configuration Guide...

  • Page 7: Setpoints

    Setpoints Setpoints The MXD70 Series can be fitted with up to six setpoint relays designated 1 – 6. Setpoints 1 – 4 are “Change Over” relays while 5 – 6 are “Normally Open” relays. Each individual setpoint can be assigned to any one of the Sensor Input Channels.

  • Page 8: Input Source

    Setpoints Input Source The input source for the selected setpoint. Available options vary depending on whether the appropriate source is enabled in the channel’s setup menu. Alarm option – see the setpoint alarm mode section. Cleaning option – see the setpoint cleaning mode section (not available on all input card types.) –...
  • Page 9 Setpoints High The setpoint will activate when the associated Sensor Input Channel’s input becomes greater than the setpoint level. The setpoint will activate when the associated Sensor Input Channel’s input becomes less than the setpoint level. Band The setpoint will activate when the associated Sensor Input Channel’s input is either greater than the setpoint high level or less than the setpoint low level.
  • Page 10 Setpoints Latch Low The setpoint will activate when the associated Sensor Input Channel’s input is less than the setpoint low level and will remain active until the input rises above the setpoint high level. It will then remain inactive until the input level falls below the setpoint low level.

  • Page 11: Mode

    Setpoints Mode The Setpoints can operate in one of three modes. On/Off Mode – The setpoint energises when the setpoint is activated and de-energises when the setpoint is de-activated. Pulse Proportional – See Setpoint proportional Mode Section. Time Proportional – See Setpoint proportional Mode Section.

  • Page 12: Hysteresis

    Setpoints Hysteresis A facility to apply hysteresis to the setpoint level allows the user to avoid setpoint “Chatter” when the sensor input level approaches the setpoint level. “Chatter” is caused when the sensor input is sufficiently close to the set point value and noise on the signal repeatedly crosses the set point level, thus causing the relay to switch on and off rapidly.

  • Page 13: Setpoint Dose Alarm

    Setpoints Setpoint Dose Alarm The dose alarm timer can be used to prevent overdosing under many different fault conditions, such as sensor failure or application problems. Dose Alarm Enable the dose alarm for the selected setpoint. – Select Option EXIT –...
  • Page 14 Setpoints Dose Alarm Acknowledge To cancel the dose alarm and reactivate the setpoint, select the required setpoint from the shown list and press enter. Note – If, once reset, the setpoint again remains energised for the length of the dose alarm timer then the dose alarm will once again activate.
  • Page 15 Setpoints Initial Charge Access Enabling this allows the user to initialise the initial charge by means of a menu on the front screen. – Select Option EXIT – Cancel – Save Selection Front Screen Initial Charge Enter the Initial Charge Menu by means of the INIT button.

  • Page 16: Setpoint Proportional Mode

    Setpoints Setpoint Proportional Mode In addition to On/Off mode the MXD70 Series also provides two forms of pseudo proportional control, which can be used to control the levels to a defined value when used in conjunction with a pump or valve.
  • Page 17 Setpoints Cycle Time Sets the cycle time (sum of both On and Off periods). Note – Time Proportional mode only. – Increase / Decrease Digit – Select Next Digit – Cancel EXIT – Save Value Proportional Band Enter the size of the proportional band in measurement units.

  • Page 18: Setpoint Alarm Mode

    Setpoints Setpoint Alarm Mode By Selecting Alarm in the setpoints input source the setpoint can be configured as an alarm output triggered by one of a number of events. When a sensor related error is detected on the associated sensor input Sensor Error –...

  • Page 19: Setpoint Cleaning Mode

    Setpoints Setpoint Cleaning Mode The Setpoints can be configured to operate a jet spray wash or rotary electrode cleaning system on a timed cycle. Its purpose is to prevent accumulation of particulate matter on the active surfaces of the sensor. Note that cleaning is not available on all sensor input types. Input Source If available select cleaning from the list of options.
  • Page 20 Setpoints Time Remaining Shows the time remaining till the next clean operation. Note – Cannot be edited. Clean Mode Associated sensor input channel state when cleaning. It is recommended that off-line is selected. This will automatically take the associated sensor input channel offline, de-energise associated setpoints and hold associated current outputs, during a clean operation.
  • Page 21 Setpoints Clean Delay If enabled this causes the clean cycle to wait if any other control setpoints associated with the sensor input channel are active. This is shown by a clean delayed message on the front screen. – Select Option EXIT –...
  • Page 22 Setpoints MXD70 Setpoints, Current Outputs, and - 20 - Digital Inputs Configuration Guide...

  • Page 23: Current Outputs

    Current Outputs Current Outputs The MXD70 Series can be fitted with up to six current outputs designated A – F. Each individual current output can be assigned to any one of the Sensor Input Channels. The current output menu contains all of the necessary setup functions to configure the current output sources.
  • Page 24 Current Outputs Input Source The input source for the selected current output. Available options vary depending on whether the appropriate source is enabled in the channel’s setup menu. – Select Option – Cancel EXIT – Save Selection Output The current output can be scaled across either 4 – 20mA or 0 –...
  • Page 25 Current Outputs Zero (0/4mA) Enter the desired sensor value to be represented by 0mA or 4mA (depends on current output scaling). An inverse relationship can be achieved by setting the Zero greater than the Span. If the sensor reading falls outside this and the span value an error / alarm will be activated.

  • Page 26: Current Output Calibration

    Current Outputs Current Output Calibration The user is provided with an opportunity to adjust the current output to calibrate any equipment that may be being used to monitor the current output signal. Main Menu From the front screen press the menu button to show the main menu options and select Calibration.
  • Page 27 Current Outputs Adjust 0mA Output Using the buttons adjust the current output until it reads the desired value on your current meter. Please keep in mind that the current output cannot go below 0mA. – Adjust Output – Cancel EXIT –...

  • Page 28: Resetting The Current Output User Calibration

    Current Outputs Resetting the current Output user Calibration If required the user can reset the current output user calibration back to factory settings. Main Menu From the front screen press the menu button to show the main menu options and select Calibration. –...
  • Page 29 Current Outputs 4-20mA Outputs Reset Select the required 4-20mA Output to Reset its user calibration back to factory settings. – Select Option EXIT – Return to Reset User Calibration – Enter Option MXD70 Setpoints, Current Outputs, - 27 - and Digital Inputs Configuration Guide...
  • Page 30 Current Outputs Blank MXD70 Setpoints, Current Outputs, and - 28 - Digital Inputs Configuration Guide...

  • Page 31: Digital Inputs

    Digital Inputs The MXD70 Series is fitted with eight digital inputs designated 1 – 8. Each individual digital input can be assigned to any one of the Sensor Input Channels or to the instrument as a whole. The digital input menu contains all of the necessary setup functions to configure the digital input sources.

  • Page 32: Offline

    Digital Inputs Function The digital input can be configured to operate in the following ways: Offline Interlock Flow Switch Input Tank Level Switch Clean Range Changing Switch Setup Calibration – Select Option EXIT – Cancel – Save Selection Offline, Interlock, Flow Switch Input, Tank Level Switch These four functions when active will take the associated sensor input channel “offline”.

  • Page 33: Clean

    Digital Inputs Clean If the selected Input Sensor Channel has a setpoint configured for a cleaning operation, a external cleaning cycle can be initiated using this function. – Select Option – Cancel EXIT – Save Selection Range Changing The digital input is used to change the displayed range of the selected sensor input channel.

  • Page 34: Calibration

    Digital Inputs Calibration Initialise a dissolved oxygen span calibration. See Dissolved Oxygen input card manual for more information. The CIP input indicates to the associated sensor channel that a CIP event is in progress so that the sensor can be disabled, to prevent overstressing the probe.

  • Page 35: Simulate Channels

    Simulate Channels Simulate Channels The facility exists within the MXD70 series to simulate the input sensor levels to test the setpoint and current output operation. This function allows the user to cycle up and down through the sensor range whilst displaying the current output level, and with the relays responding accordingly.
  • Page 36 Notes MXD70 Setpoints, Current Outputs, and - 34 - Digital Inputs Configuration Guide...
  • Page 37 Notes MXD70 Setpoints, Current Outputs, - 35 - and Digital Inputs Configuration Guide...

  • Page 38: Index

    Index Index Calibration LVD ................2 Current Output......... 24 Manual Clean .............19 Resetting............. 26 Manufacturing Standards........ 2 Current Output..........21 Pulse Proportional Mode .......14 Calibration..........24 Quality ..............2 Channel............21 Safety ..............2 Error.............. 23 Setpoint Trigger..........6 Input Source ..........22 Band..............

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