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Contrec 220 User Manual

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LEVEL MONITOR
MODEL 220
220-M-V3.1
June 2017

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Summary of Contents for Contrec 220

  • Page 1 LEVEL MONITOR MODEL 220 220-M-V3.1 June 2017...

  • Page 3: Table Of Contents

    CONTENTS 1. Introduction 1.1 Model Number Designation 1.2 Intrinsic Safety Approvals 2. Specification 3. Operation 3.1 Display 3.1.1 Level Bar Graph 3.1.2 Contents 3.2 Front Panel Operation 3.2.1 Displaying Data 3.2.2 Changing Data 3.2.3 Timeout Condition 3.3 Test Mode 3.4 Alarms 3.4.1 Types of Alarms 3.4.2 Alarm Deadband 3.4.3 Alarm Action...
  • Page 4 7. Installation 7.1 Wall Mounting 7.2 Panel Mount Version 7.3 Removing the Front Panel 7.4 The Main Electronics 7.5 Wiring 7.6 Maintenance 7.7 Terminal Designations 8. Intrinsic Safety Connections Index...

  • Page 5: Introduction

    Introduction 1. INTRODUCTION The Model 220i Level Monitor is a microprocessor based instrument which accepts a 4-20mA input and displays level and contents. It is powered entirely from the 4-20mA loop and, therefore, does not require an external power source. Level is displayed in a bar graph as 0...100%.

  • Page 6: Model Number Designation

    Introduction 1.1 MODEL NUMBER DESIGNATION The Model Number of the 220i describes the input and output options installed and the mounting options. 220 i . 2 M Model Mounting 220i Intrinsically Safe 1 Panel mount version 2 Wall mount 6 2" pipe bracket...

  • Page 7: Intrinsic Safety Approvals

    Introduction 1.2 INTRINSIC SAFETY APPROVALS The Model 220i is certified for use in hazardous areas and has IECEx, ATEX and CSA approvals. US/C The Model 220i certification details are: IECEx Approval IECEx BVS 15.0099X Rating Ex ia IIB T4 Gb ATEX Approval BVS 15 ATEX E 106 X Rating...

  • Page 8: Specification

    Specification 2. SPECIFICATION General Display: Continuously powered LCD. Level: 30mm bar graph. Level Span: 0...100% per full scale. Contents: 7 digit with 4½ digit resolution, 12mm (0.5") high. Contents Span: The units of measure (eg. litres) at full scale of input signal. The contents span is programmable in the range of 0.000...9,999,999.
  • Page 9 Specification Physical Operating Temperature: -20°C to 60°C. Dimensions: 97mm (3.8") high x 150mm (5.9") wide x 41mm (1.6") deep (not including cable glands). Protection: Nema 4X or IP67 standards. Cable Entry: Cable glands. Mounting: Universal mounting bracket is supplied as standard.

  • Page 10: Operation

    Operation 3. OPERATION The Model 220i Level Monitor accepts a 4-20mA input signal from a level sensor such as a pressure transmitter, ultrasonic sensor or capacitance probe. The instrument is powered entirely from the loop and, therefore, requires no external power or internal batteries. The instrument is fully programmable with all operating parameters and calculation constants programmable from the front panel (see Section 4.1).

  • Page 11: Contents

    Operation 3.1.2 Contents The contents is a 7 digit numeric display where the span can be programmed during setup to read in any engineering units. The contents are displayed with 4½ resolution in respect to the maximum contents. For example, if the maximum contents is 1234567, the display will show up to 5 digits plus trailing zeros.

  • Page 12: Front Panel Operation

    Operation 3.2 FRONT PANEL OPERATION 3.2.1 Displaying Data The alarm setpoints and density correction factor can be viewed by pressing the DISPLAY key. Key action What you will see What this means If there are flashing alarms on Acknowledges alarms if the display they will stop DISPLAY alarms are flashing on...
  • Page 13 Operation Key action What you will see What this The high alarm setpoint DISPLAY as a % of maximum level The value of the high alarm . or contents value. AL-LO Low alarm. DISPLAY The low alarm setpoint as a % of maximum level DISPLAY The value of the low alarm.
  • Page 14 Operation Key action What you will see What this Density correction DISPLAY A factor for those applications where the The value of the density DISPLAY density of the fluid in correction factor. the tank is likely to change (default of 1.000).

  • Page 15: Changing Data

    Operation 3.2.2 Changing Data Each of the above parameters can be changed as follows: 1. Pressing the DISPLAY key consecutively until the numeric value of the parameter to be changed appears (as described in the previous diagram). 2. This value can then be changed using the following keys: This key steps from digit to digit, causing the digit to flash.

  • Page 16: Timeout Condition

    Operation 3.2.3 Timeout Condition Upon entering the display mode, if no key is pressed for 10 seconds, the display returns to the contents display with alarm acknowledgment cleared. 3.3 TEST MODE The 220i has a test mode which can be entered by simultaneously pressing all 3 front panel keys.

  • Page 17: Alarms

    Operation 3.4 ALARMS The Model 220i has 4 alarm outputs: High-High (HH) High (H) Low (L) Low-Low (LL) The alarms can be assigned to level or contents which is done during programming (see Section 4.1). Each alarm is individually programmed as a percentage (0-100%) of level or contents. All of the alarms have open collector outputs and are separately isolated via opto-isolators.

  • Page 18: Types Of Alarms

    Operation 3.4.1 Types of Alarms 3.4.1.1 Alarm Output The Model 220i can be programmed for the alarm outputs to operate in one of two ways: 1. the alarm outputs can energise (switch on) during an alarm condition, or 2. the alarm outputs can de-energise (switch off) during an alarm condition. 3.4.1.2 High Alarms The high alarms will be activated when the contents or level in the tank increase above the high alarm setpoints.

  • Page 19: Alarm Deadband

    Operation 3.4.2 Alarm Deadband To prevent an alarm toggling on and off when the level is close to the setpoint, a user programmable deadband is provided. The deadband is a percentage (0-100%) of the maximum level or contents. Example 1. If the low alarm is set to 20% and the deadband is set to 5%, the alarm will be activated when the level reaches 20%.
  • Page 20 Operation Continuous Alarms Acknowledgeable Alarms 1. These alarms are acknowledged 1. A continuous alarm cannot be by pressing the DISPLAY key. acknowledged. 2. Once the alarm is acknowledged 2. The flashing on the LCD cannot the flashing on the LCD will be stopped and will keep flashing until the alarm cease, with the alarm message...

  • Page 21: Setting Alarms

    Operation 3.4.4 Setting Alarms To set any of the alarms: 1. Press the DISPLAY key until the name of the alarm to be changed appears (see Section 3.2.1). 2. Use the keys to change the value of the alarm. 3. Press the DISPLAY key until the original level/contents screen appears.

  • Page 22: Non-Linearity

    The user programs the corresponding of the tank. corrected volume (output) point,which is also normalised. Th e Model 220 performs a linear interpolation between these points to obtain a profile of input signal versus corrected output for the volume of the tank.
  • Page 23 Operation DETERMINING THE NON-LINEAR CORRECTION TABLE Data on tank non-linearity is usually supplied by the tank manufacturer, in the form of strapping tables. If this data is not available, the user will need to determine the relationship between level and volume. This can be done mathematically by equations, or experimentally, by conducting physical measurements.
  • Page 24 Operation Where, Level Normalised Input = Level at 20mA Level - (Level at Zero) (Level at Span) - (Level at Zero) If the Zero is > 0 So, for example, at 9.406m the normalised input is: (9.406 - 0.5) 10 - 0.5 = 0.938 Similarly, Volume...
  • Page 25 The output from the program can be printed and is in a format suitable for direct programming into the Model 220i. The program runs on a Windows 95 (or higher)operating system. The software is only available from our website www.contrec.co.uk and can be downloaded free of charge.

  • Page 26: Filtering

    Operation 3.6 FILTERING Input fluctuations caused by tank agitation can interfere with the stability of the level and contents readings. For this reason, the Model 220i has a digital filter which will average out these fluctuations and enable accurate readings. The degree of filtering of the input signal can be adjusted, depending on the amount of fluctuation and the particular application.
  • Page 27 Operation Filter Factor vs Time to Reach New Reading (for a step change in input signal) Filter Factor 90% of New Reading 99% of New Reading...

  • Page 28: Density Correction

    Operation 3.7 DENSITY CORRECTION In some cases, a pressure transmitter will be used to provide the 4-20mA signal to the Model 220i. In these cases, a density correction factor (K D ) can be manually entered to compensate for those applications where the density of the fluid in the tank is likely to change.
  • Page 29 Operation Example. A tank is initially filled with toluene, which has a density at standard conditions of 866 kg/m 3 . The Model 220i and a level transmitter are calibrated for the volume in this tank and the density correction factor (K D ) is set to 1.000.

  • Page 30: Programming

    Programming 4. PROGRAMMING The Model 220i is fully programmable with all parameters being stored in memory. To enter the Program Mode: Remove the lower cover strip (the dark grey strip along the bottom of the front of the enclosure) and replace it the reverse side up. This brings a small magnet on the inside of the cover strip in contact with a reed switch inside the instrument.

  • Page 31: Program Steps

    Programming 4.1 PROGRAM STEPS Step Display Description Select whether alarms are assigned to level or contents. Alarms are assigned to level. Level Alarms are assigned to contents. Cont TYPE Select whether alarms are normally energised or normally de-energised. Normally energised. Normally de-energised.
  • Page 32 Programming Step Display Description Select input type; either inverted or INPUT non-inverted. Non-inverted (zero at 4mA). N-INV Inverted (zero at 20mA). Select enable or disable. This will allow DISP (enable) or not allow (disable) the user to change the alarm setpoints and the density correction factor from the DISPLAY key.
  • Page 33 Programming S tep Display Description The zero of the contents. The zero can C-00 be programmed in the range of 0.000 to 9,999,999. Select whether the input signal is linear or non-linear. Linear. N-lin Non-linear. Steps 13-17 are displayed only if the input signal is non-linear. The number of points for non-linear No-PTS correction.

  • Page 34: Signal Input

    Signal Input 5. SIGNAL INPUT The signal input is on terminals 3 and 4 and is connected as follows:...

  • Page 35: Alarm Outputs

    Alarm Outputs 6. ALARM OUTPUTS Open collector outputs are provided for high and low level alarms. The output can sink up to 200mA and can be used to power external relays, lights or audible alarms. The outputs are internally protected against voltage spikes. Both outputs are separately isolated via opto-isolators.
  • Page 36 Alarm Outputs Connections...

  • Page 37: Installation

    Installation 7. INSTALLATION 7.1 WALL MOUNTING A wall mounting bracket is supplied with each instrument. Round head screws should be used to attach the bracket to the wall (countersunk screws should  not  be  used).  The  bracket  is  mounted  first,  with  the   tray    s ection  at the bottom.

  • Page 38: Panel Mount Version

    Installation 7.2 PANEL MOUNT VERSION The panel mount version of the Model 220i is supplied with two panel mount brackets and plug-in terminals, which are accessible from the rear of the instrument. A diagram of the rear panel is shown below: The cutout for this version is 141mm (5.55") wide x 87mm (3.43") high.

  • Page 39: Removing The Front Panel

    Installation 7.3 REMOVING THE FRONT PANEL The front panel should be removed as follows: 1. Remove the top and bottom cover strips (ie. the dark plastic strip) by levering a screwdriver under one end. 2. Undo the screws retaining the front. Do not remove the screws, they are retained by O-rings.
  • Page 40 Installation...

  • Page 41: The Main Electronics

    Installation 7.4 THE MAIN ELECTRONICS The front section of the housing contains the microprocessor and display. It is possible to adjust the display contrast via a small potentiometer on the board. The display contrast is shown below and this can be adjusted for optimum contrast.

  • Page 42: Wiring

    Council of the European Community. 7.6 MAINTENANCE All printed circuit boards must be repaired by Contrec Ltd. In the case of a fault, no attempt should be made to repair the board as the intrinsically safe functionality may be impaired.

  • Page 43: Terminal Designations

    Installation 7.7 TERMINAL DESIGNATIONS 4-20mA Input 4-20mA (-) 4-20mA (+) Outputs Low-low Alarm (-) Low-low Alarm (+) Low Alarm (-) Low Alarm (+) High Alarm (-) High Alarm (+) High-high Alarm (-) High-high Alarm (+)

  • Page 44: Intrinsic Safety Connections

    Intrinsic Safety Connections 8. INTRINSIC SAFETY CONNECTIONS When installing the Model 220i in hazardous areas, the wiring and installation must comply with appropriate installation standards. The approval uses entity parameters and an associated apparatus type approval on the input/output connections to the 4-20mA current loop and alarms.
  • Page 45 Intrinsic Safety Connections...

  • Page 46: Index

    Index Index Installation, 32 Tank Conversion Intrinsic Safety, 3, 44 Software, 21 4½ Resolution, 7 Terminal Designations, Test Mode, 12 Level Bar Graph, 6 Alarms, 13 Timeout, 12 Low Alarms, 14 Acknowledgeable Alarms, 15 Alarm Deadband, 15 Alarm Outputs, 30 Wall Mounting, 32 Microprocessor, 36 Wiring, 37...

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