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J&E Hall Danfoss AKS 41 Manual

Liquid level transmitter
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Danfoss AKS 41 Liquid Level Transmitter
Contents
1.
About this Publication ................................................................................................. 3
1.1.
Safety Warnings and Symbols ................................................................................................ 3
1.2.
Units of Measurement ............................................................................................................. 3
1.3.
Terminology ............................................................................................................................ 3
1.4.
Ordering Extra Copies ............................................................................................................ 3
2.
Application ................................................................................................................... 4
3.
Operation .................................................................................................................... 4
4.
Technical Data ............................................................................................................ 5
5.
Installation ................................................................................................................... 6
6.
Adjustment .................................................................................................................. 8
6.1.
Setting for the Refrigerant ....................................................................................................... 8
6.2.
Calibration for Minimum and Maximum Liquid Level .............................................................. 9
6.2.1. Calibration for Minimum Liquid Level .................................................................................... 10
6.2.2. Calibration for Maximum Liquid Level ................................................................................... 10
6.3.
6.4.
Signal Damping .................................................................................................................... 11
6.5.
Restore Factory Default Settings .......................................................................................... 12
7.
Commissioning.......................................................................................................... 12
8.
Maintenance .............................................................................................................. 12
9.
Faults and Remedies ................................................................................................ 13
10.
Spares ....................................................................................................................... 14
11.
Appendix 1 AKS 41 Early Version ............................................................................ 15
11.1. Measuring Test Voltage ........................................................................................................ 15
12.
Adjustment (Early Version) ....................................................................................... 16
12.1. Setting AKS 41 for the Refrigerant (Early Version) ............................................................... 16
12.2. Calibration for Minimum Liquid Level (Early Version) ........................................................... 16
12.3. Calibration for Maximum Liquid Level (Early Version) .......................................................... 16
(Early Version)
12.5. Signal Damping (Early Version) ............................................................................................ 17
Fig 1 Principle of Operation .................................................................................................................... 4
Fig 2 Wiring ............................................................................................................................................ 6
Fig 3 AKS 41 and AKS 41U Liquid Level Transmitters ........................................................................... 6
Fig 4 Calibration for the Refrigerant ........................................................................................................ 8
Fig 5 Calibration for Minimum and Maximum Liquid Level ..................................................................... 9
Fig 6 4 to 20 mA Output Signal Damping ............................................................................................. 12
Table 1 Technical Data ........................................................................................................................... 5
Table 2 Common Faults and Remedies ............................................................................................... 14
Section 9
Issue 1 : 10/11
Section 9
Publication 9-45
Issue 1 : 10/11
Publication 9-45
Page 1 of 18

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Summary of Contents for J&E Hall Danfoss AKS 41

  • Page 1: Table Of Contents

    Section 9 Publication 9-45 Issue 1 : 10/11 Danfoss AKS 41 Liquid Level Transmitter Contents About this Publication ....................3 1.1. Safety Warnings and Symbols ....................3 1.2. Units of Measurement ......................3 1.3. Terminology ..........................3 1.4. Ordering Extra Copies ......................3 Application ........................
  • Page 2 Danfoss AKS 41 Liquid Level Transmitter © J & E Hall International 2011 All rights reserved. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording or by any information storage or retrieval system, without permission in writing from the copyright holder.

  • Page 3: About This Publication

    Danfoss AKS 41 Liquid Level Transmitter About this Publication These instructions have been prepared according to the following standards: BS 4884 : Technical Manuals: Part 1 : 1992 Specification for Presentation of Essential Information. Part 2 : 1993 Guide to Content.

  • Page 4: Application

    Danfoss AKS 41 Liquid Level Transmitter Application AKS 41 and AKS 41U liquid level transmitters are used to measure refrigerant liquid level for control applications. The transmitter supplies a 4 to 20 mA signal in proportion to the level of liquid refrigerant. This signal can be used with a suitable controller to control the level of refrigerant within a vessel.

  • Page 5: Technical Data

    Danfoss AKS 41 Liquid Level Transmitter The capacitive rod can measure the level of conducting as well as non- conducting liquids. If the rod is partially immersed in a conducting liquid, for example, R717 (ammonia) or R718 (water). On the part of the rod that is surrounded by liquid, the outer tube is short-circuited to the teflon insulation.

  • Page 6: Installation

    Danfoss AKS 41 Liquid Level Transmitter Installation Allow adequate space for transmitter removal. Locate a gasket seal under the hexagon portion of the transmitter body, insert into the level column taking care not to bend the transmitter. Tighten with a spanner on the hexagon flats provided.
  • Page 7 Danfoss AKS 41 Liquid Level Transmitter Plug can be mounted in four different positions Transmitter housing and tube can be separated without Calibration emptying the Cover standpipe DIN Plug Connection LED Bar Calibration Cover Graph (option) Green LED (‘flashes’ slowly...

  • Page 8: Adjustment

    Danfoss AKS 41 Liquid Level Transmitter Adjustment 6.1. Setting for the Refrigerant The AKS 41/AKS 41U will not need setting if is used with R717 (ammonia) or R718 (water) and the length of the transmitter corresponds to the actual refrigerant measured range.

  • Page 9: Calibration For Minimum And Maximum Liquid Level

    Danfoss AKS 41 Liquid Level Transmitter Remove the meter from the DIN plug and reassemble. Leave setting mode by removing the DIN plug so there is no voltage to the level transmitter. After a few seconds, refit the plug. The level transmitter should now operate normally.

  • Page 10: Calibration For Minimum Liquid Level

    Danfoss AKS 41 Liquid Level Transmitter 6.2.1. Calibration for Minimum Liquid Level Bring the liquid refrigerant to the level corresponding to the lower limit of the measuring range. i.e. the point on the rod where the transmitter’s output signal is to be 4 mA. The full length of the rod should be used if possible, so calibrate the lower limit with the liquid level below the end of the rod.

  • Page 11: Maximum Calibration When Maximum Liquid Level Different From 20 Ma

    Danfoss AKS 41 Liquid Level Transmitter Within the next 10 seconds, press the calibration push-button and keep it pressed. NOTE: if the calibration push-button is not pressed within 10 seconds, the AKS 41/AKS 41U will automatically leave calibration mode and return to normal operation.

  • Page 12: Restore Factory Default Settings

    Danfoss AKS 41 Liquid Level Transmitter Liquid Level 4 to 20 mA Output Signal Reaction Time Fig 6 4 to 20 mA Output Signal Damping Signal damping is factory set at 15 seconds and can be altered within the range 1 to 120 seconds. Setting the signal damping is performed while the transmitter is operating.

  • Page 13: Faults And Remedies

    Danfoss AKS 41 Liquid Level Transmitter If the system uses R717 (ammonia) refrigerant, oil may tend to collect at the bottom of the level column and eventually interfere with the correct operation of the transmitter. Check for oil logging and if necessary drain...

  • Page 14: Spares

    Danfoss AKS 41 Liquid Level Transmitter 1. FAULT: An output signal between 4 to 20 mA is measured but the current does not match the actual liquid level Probable Cause Remedy Level transmitter not set to the correct refrigerant. Set the transmitter to the refrigerant; refer to 6.

  • Page 15: Appendix 1 Aks 41 Early Version

    Danfoss AKS 41 Liquid Level Transmitter Appendix 1 AKS 41 Early Version The early version of the AKS 41 is provided with two LEDs: one green, one red. Pins are provided for measuring the 4 to 20 mA output signal and for measuring a test voltage used for troubleshooting.

  • Page 16: Adjustment (Early Version)

    Danfoss AKS 41 Liquid Level Transmitter Adjustment (Early Version) 12.1. Setting AKS 41 for the Refrigerant (Early Version) Same as the later version of the AKS 41; refer to 6.1. The red LED ‘flashes’ when the transmitter is in setting mode.

  • Page 17: Signal Damping (Early Version)

    Danfoss AKS 41 Liquid Level Transmitter When the programming push-button is pressed, .the 4 to 20 mA signal increases in 2 mA steps, where each step is maintained for 4 seconds. If the programming button is released at a certain step, the actual liquid level is calibrated to the value the current has reached.
  • Page 18 Danfoss AKS 41 Liquid Level Transmitter This page intentionally blank Publication 9-45 Section 9 Page 18 of 18 Issue 1 : 10/11...

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