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Kipp & Zonen CT24 Instruction Manual

Signal amplifier 4 - 20 ma
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INSTRUCTION MANUAL
SIGNAL AMPLIFIER 4 - 20 mA

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Summary of Contents for Kipp & Zonen CT24

  • Page 1 INSTRUCTION MANUAL SIGNAL AMPLIFIER 4 - 20 mA...

  • Page 2: Important User Information

    IMPORTANT USER INFORMATION IMPORTANT USER INFORMATION Reading this entire manual is recommended for full understanding of the use of this product Should you have any comments on the product or this manual we will be pleased to receive them at: Kipp &...
  • Page 3 IMPORTANT USER INFORMATION © COPYRIGHT 2004 KIPP & ZONEN All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted in any form or by any means, without permission in written form from the company. Manual version: 0604...

  • Page 4: Declaration Of Conformity

    IMPORTANT USER INFORMATION Declaration of Conformity According to EC guideline 89/336/EEC 73/23/EEC Kipp & Zonen B.V. Röntgenweg 1 2624 BD Delft Declare under our sole responsibility that the product Type: CT 24 Name: Solar Sensor Amplifier 4 – 20 mA To which this declaration relates is in conformity with the following standards: Imissions...
  • Page 5 IMPORTANT USER INFORMATION...

  • Page 6: Table Of Contents

    TABLE OF CONTENTS TABLE OF CONTENTS IMPORTANT USER INFORMATION.......1 Declaration of Conformity ..........3 TABLE OF CONTENTS...........5 GENERAL INFORMATION ........7 SPECIFICATIONS ..........9 CONNECTION OF THE CT 24 ......11 Minimising interference ........13 Selecting the supply voltage ........14 Connection for current output.......15 Connection for voltage output ......17 NEGATIVE INPUT SIGNALS ......21 CALIBRATION PROCEDURE ......23 Standard calibration ..........23...
  • Page 7 TABLE OF CONTENTS...

  • Page 8: General Information

    GENERAL INFORMATION GENERAL INFORMATION With the CT 24 it is possible to convert a low level voltage output from a solar sensor to the standard level of 4 – 20 mA or (using the installed 500 Ohm resistor) to a 2 – 10 Volt signal.
  • Page 9 GENERAL INFORMATION...

  • Page 10: Specifications

    SPECIFICATIONS SPECIFICATIONS Current output range nominal 4 to 20 mA = 500 Ω 2 to 10 V Voltage output range @ R Gain, factory set 1 mA / mV +/- 0.1% Gain adjust +0.5 to +1.0 mA / mV Zero, factory set +4 mA +/- 0.1% Zero adjust +3 to +8 mA...
  • Page 11 SPECIFICATIONS...

  • Page 12: Connection Of The Ct24

    CONNECTION OF THE CT24 CONNECTION OF THE CT 24 The CT 24 is meant to boost the (low level) output signal of a solar sensor. Therefore the CT 24 amplifier needs to be close to the sensor to maintain a high signal to noise ratio in the cable.
  • Page 13 CONNECTION OF THE CT24 The passive Kipp & Zonen sensors have floating outputs (not connected to sensor housing or shield), so the inputs of the CT 24 will be floating. Actually the rule of thumb is that any connection between CT 24 input LO and output LO is not allowed (e.g.

  • Page 14: Minimising Interference

    CONNECTION OF THE CT24 Minimising interference Use sensors with shielded cables. All Kipp & Zonen sensor cables have an internal shield that can be connected to a ground. Many passive Kipp & Zonen sensors have the shield connected to the sensor housing. If the sensor is mounted to a grounded frame, the shield of the input cable is grounded too.

  • Page 15: Selecting The Supply Voltage

    CONNECTION OF THE CT24 Selecting the supply voltage The CT 24 operates as a so-called 2 wire current transmitter. This means that the amplifier receives its operating current from the loop that represents the current output signal. The loop has to be powered with a power supply or active receiver capable of providing a voltage between 12 and 30 Volt @ 100 Ohm “loop resistance”.

  • Page 16: Connection For Current Output

    CONNECTION OF THE CT24 Connection for current output When the CT 24 is used as a standard 4−20 mA amplifier (transmitter) only 2 input and 2 output wires have to be connected plus two times the shielding of both cables.
  • Page 17 CONNECTION OF THE CT24 Shield Power supply + Current out figure 5.3 connection for current output...

  • Page 18: Connection For Voltage Output

    CONNECTION OF THE CT24 Connection for voltage output When a voltage signal is needed directly from the CT 24, the conversion from current to voltage can be made inside the CT 24. For this purpose a precision 500 Ohm resistor is supplied that can be connected through the connection strip.
  • Page 19 CONNECTION OF THE CT24 So when the CT 24 is used with a voltage output, 2 input and 4 output wires have to be connected plus two times the shielding of both cables. Of course any other R can be used to transform the output current to a voltage, as long as the guideline from chapter 5 is followed.
  • Page 20 CONNECTION OF THE CT24 At this place we have to precise the rule of thumb. The oscillating occur due to a certain capacitive coupling (> 500 pF) between CT 24 input LO and common of power supply and data logger, especially in the voltage output mode with the internal RL= 500 Ω...

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