orbia NETAFIM AWT420 User & Installation Manual

Universal 4-wire, dual-input transmitter

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AWT420

Universal 4-Wire,

Dual-Input Transmitter

User & Installation Manual

Table of Contents

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Page 1 AWT420 Universal 4-Wire, Dual-Input Transmitter User & Installation Manual...
Page 2 © COPYRIGHT 2023, NETAFIM™ NO PART OF THIS PUBLICATION MAY BE REPRODUCED, STORED IN AN AUTOMATED DATA FILE OR MADE PUBLIC IN ANY FORM OR BY ANY MEANS, WHETHER ELECTRONIC, MECHANICAL, BY PHOTOCOPYING, RECORDING OR IN ANY OTHER MANNER WITHOUT PRIOR WRITTEN PERMISSION OF NETAFIM™. THIS DOCUMENT IS PRESENTED WITH THE EXCLUSIVE AIM OF NOTIFYING SELECTED POTENTIAL CLIENTS REGARDING THE NETAFIM™...
Page 3: Table Of Contents
CONTENTS INTRODUCTION About this document Further information HEALTH & SAFETY Document symbols Safety precautions Potential electrical safety hazards Safety standards Product symbols Product recycling and disposal (Europe only) Information on ROHS Directive 2011/65/EU (RoHS II) Cleaning DESCRIPTION Overview Configurations Modules Dimensions BASIC OPERATION Display...
Page 4: Introduction
INTRODUCTION Netafim™ congratulates you on purchasing the AWT420 transmitter. The AWT420 is a universal 4-wire, dual-input transmitter suitable for the measurement and control of a wide range of parameters including pH, ORP, conductivity, turbidity/suspended solids and dissolved oxygen. ABOUT THIS DOCUMENT This manual is a concise version intended for the specific use of the AWT420 transmitter relevant to use with Netafim™...
Page 5: Health & Safety
HEALTH & SAFETY DOCUMENT SYMBOLS Symbols that appear in this document are explained below: DANGER The signal word ‘DANGER’ indicates an imminent danger. Failure to observe this information will result in death or severe injury. WARNING The signal word ‘WARNING’ indicates an imminent danger. Failure to observe this information may result in death or severe injury.
Page 6: Product Symbols
PRODUCT SYMBOLS Symbols that may appear on this product are shown below: Protective earth (ground) terminal. Functional earth (ground) terminal. Alternating current supply only. Direct current supply only. This symbol, when noted on a product, indicates a potential hazard which could cause serious personal injury and/or death.
Page 7: Description
DESCRIPTION OVERVIEW The AWT420 is a universal 4-wire single or dual- Display input transmitter suitable for the measurement and Transmitter control of a wide range of parameters including door lock pH, ORP, conductivity, turbidity/suspended solids and dissolved oxygen (depending on the module[s] fitted).
Page 8: Configurations
CONFIGURATIONS The AWT420 transmitter offered by Netafim™ for use with its dosing systems is factory pre-configurated for its specific use: EC and pH configuration is the common configuration of the AWT420 for use with Netafim™ dosing systems (FertiKit, NetaJet, NetaFlex, etc.). A double-EC configuration is optional for condition of water EC non-uniformity.
Page 9: Basic Operation
BASIC OPERATION This chapter describes basic operation of the AWT420 transmitter. (For in-depth operation instructions see Further information page DISPLAY Operating mode Instrument tag (user-assignable) Time and date 03-09-2019 NETAFIM Sensor tag 14: 33:12 (user-assignable) EC 1 Chemical units 0 0 . 0 0 mS/cm Chemical units Process value (PV)
Page 10: Front Panel Keys
FRONT PANEL KEYS The transmitter is operated using the front panel keys. Prompts associated with active keys are displayed on each screen. For further information see Further information page Key Function Description Navigation key – left When any Operating, View or Log page is displayed, opens or closes and Operator menu access key the Operator menu and returns to the previous menu level.
Page 11: Mechanical Installation
MECHANICAL INSTALLATION LOCATION Install in a clean, dry, well ventilated and vibration-free location providing easy access. Avoid rooms containing corrosive gases or vapors, for example, chlorination equipment or chlorine gas cylinders. Ambient temperature: Min. –10 °C (–14 °F); Max. 55 °C (131 °F). Humidity: 0 to 95 % RH, non-condensing Avoid vibrations.
Page 12: Electrical Installation
ELECTRICAL INSTALLATION DANGER Bodily injury Before making any connections, the external protective earth stud must be connected to the local earth bonding point using suitably sized ground cable – see page The transmitter is not fitted with a switch – an isolation device such as a switch or circuit breaker conforming to local safety standards must be fitted to the final installation.
Page 13: Installation Of The Modules
INSTALLATION OF THE MODULES Plug the modules to the transmitter baseboard: Plug the EC sensor module to the middle post. Plug the pH sensor module to the right post. EARTH BONDING WARNING Before making any electrical connections: The protective earth stud (see page 16) must be connected to the local earth bonding point using suitably sized ground cable.
Page 14: Terminal Connections
TERMINAL CONNECTIONS Only the connections relevant to EC and pH seensing configuration are described. (For the full connection scheme of the AWT420 transmitter see Further information page WARNING The main board connections are located under the protective cover. The transmitter AC version runs high current.
Page 15: Sensor Calibration
SENSOR CALIBRATION The sensor calibration is a smart one-point calibration routine. The AWT420 transmitter automatically adjusts the offset, slope, or both in order to obtain the best sensor performance. Since this routine only uses the most recent calibration data, calibration can be conducted throughout the sensor’s life thus ensuring consistent sensor performance.
Page 16 5. Press the key to enter a new value (the transmitter takes several seconds to validate the calibration):. 1.413 mS/cm 1.405 1.413 mS/cm If the new value is valid, Slope and Offset values are displayed. 1.414 mS/cm 146.1 % 0.00 uS/cm Invalid new calibration values generate an error message and the calibration value is not accepted.
Page 17: Ph Sensor Calibration
pH SENSOR CALIBRATION 3. Use the keys to select Sensor Calibration and press the key to confirm selection. The calibration type menu is displayed: NOTICE Before starting the calibration process make sure the temperature of the buffer solutions is 25°C. 1.
Page 18 If the calibration fails the result screen is displayed 6. Use the key to edit the low buffer value. with the reason for failure. Use the keys to set the value and press key to confirm changes. If the calibration passes the procedure moves Press the key to proceed to the next step.
Page 19: Access Level
10. After completion of the calibration process press the key consecutively until the main screen is displayed. 7.00 pH 25.0 °C 97.3 % 6.96 pH On completion the result screen is displayed. If the calibration passes the slope and offset values are displayed.
Page 20: Specifications
SPECIFICATIONS OPERATION SECURITY Display Password protection 89 mm (3.5 in) color 1/4 VGA TFT, liquid crystal Access to service levels is enabled only after display (LCD) with built-in backlight and the factory-authorized technician has entered a brightness/contrast adjustment password. Language English, German, French, Italian, Spanish ELECTRICAL Keypad...
Page 21 RELAY OUTPUTS 4 standard single-pole changeover Emissions & immunity Fully-programmable Meets requirements of IEC61326 for an industrial environment – Contacts rating: 5A @ 110/240 V AC (Non-Inductive) 5A @ 30 V DC APPROVALS, CERTIFICATION DIGITAL INPUT/OUTPUT AND SAFETY 1 standard, user-programmable as input or output Safety approval Minimum input pulse duration: 125 ms cULus...
Page 22: Spare Parts
SPARE PARTS TRANSMITTER KIT Description Cat. No. EC/pH transmitter, panel mount/wall mount AWT420 74360-007901 For other configurations contact you local Netafim representative. MODULES Description Cat. No. EC module replacement for AWT420 74360-007970 pH module replacement for AWT420 74360-007971 SENSORS Description Cat.
Page 23: Warranty
WARRANTY Prior to installation, the equipment referred to in this manual must be stored in a clean, dry environment, in accordance with the Company’s published specification. Periodic checks must be made on the equipment’s condition. In the event of a failure under warranty, the following documentation must be provided as substantiation: A listing evidencing process operation and alarm logs at time of failure.
Page 24 www.netafim.com...