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Summary of Contents for HYDROLOGICAL SERVICES WLT420
- Page 1 Hydrological Services Pty Ltd WIRELESS LEVEL TRANSMITTER MODEL WLT420 OPERATING MANUAL HYDROLOGICAL SERVICES Pty Ltd 48-50 Scrivener Street Liverpool NSW 2170 Australia Ph. 61 2 9601 2022 Fax. 61 2 9602 6971 E-Mail: sales@hydrologicalservices.com...
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Page 2: Table Of Contents
Hydrological Services Pty Ltd TABLE OF CONTENTS Product Overview..................3 Installation ....................4 Hardware Connections ..................4 Antenna Mounting....................7 Power Supply ....................... 7 Operation ....................8 Transmitter LED ....................8 LCD Navigation ....................8 Displaying Water Volume................... 10 Specification ....................11 Hardware Specification.................. -
Page 3: Product Overview
Hydrological Services Pty Ltd Product Overview The Hydrological Services Wireless Level Transmitter WLT420 has been designed using surface mount technology to provide a very small, ultra low power and reliable wireless 4 to 20mA transmitter / receiver pair that can be used in harsh environments for extended periods. -
Page 4: Installation
Hydrological Services Pty Ltd Installation Hardware Connections The Wireless Level Transmitter periodically switches the battery voltage to the transducer for the warm up time (preset on the DIP switches) and then measures the 4-20mA current. The terminals are screwless, simply push the wire into terminal hole – you may need to depress the orange release lever if fine wire is used. - Page 5 Hydrological Services Pty Ltd Transducer Power Warm Up Warm Up 2,5,10,15 Secs 2,5,10,15 Secs Sample Sample 1 Sec 1 Sec TxInt Transmission Interval 0,1,15,60 Mins (continuous = 0 mins) Transmission What are the WarmUp and TxInt periods ? The transducer is powered on during the Warm Up period and then a sample is taken lasting 1 second.
- Page 6 Hydrological Services Pty Ltd The Wireless Level Receiver has an optically isolated 4-20mA output that is powered by the external 4-20mA power. 4-20mA output + Battery + 4-20mA output - Battery - Wireless Level Configuration Aerial Receiver DIP Switches DIP Switches 1,2,3 set the transmission frequency...
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Page 7: Antenna Mounting
Hydrological Services Pty Ltd Antenna Mounting Both the transmitter and receiver are supplied with a ground plane independent antenna that have 1.5dB gain. (The mounting thread of the antenna is connected to the battery –ve input.) The antenna is mounted by : •... -
Page 8: Operation
When the transmitter is set to continuous transmit mode, the receiver LCD recognises this and stays on permanently. This mode is useful when testing the WLT420. When the transmitter is set to transmit every 1min, 15 mins or 60 mins then the receiver will automatically go to sleep, and then automatically wake up the RF circuitry ready to receive the next expected message –... - Page 9 Hydrological Services Pty Ltd NOTE : No text on arrow => Press Scroll button Sel 5 sec => Press Select button for 5 secs Sel 5 sec Select Water Lvl Set Level Edit Set Level 1.375m 1.200m Sel 5 sec...
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Page 10: Displaying Water Volume
Hydrological Services Pty Ltd Displaying Water Volume The WLT420 has the facility to display the water volume (of a reservoir) as a function of the water level. See Appendix B for details on how to derive the appropriate equation and hence the terms of the 4 order polynomial Poly0 thru to Poly4. -
Page 11: Specification
Hydrological Services Pty Ltd Specification Hardware Specification Transmitter Inputs 4-20mA Input (12 bit resolution : 256 samples over 1 sec) Receiver Outputs 4-20mA Output (16 bit resolution) Indicators WLT420T Transmitter - Status LED indicator WLT420R Receiver – Status LED + 8 char x 2 line LCD Displays Water Level, Volume, Battery Voltage, …... -
Page 12: Appendix A Connecting A Wl1200W Transducer
Hydrological Services Pty Ltd Appendix A Connecting a WL1200W Transducer Brown Transducer + Green Transducer - Blue Earth Screen Wireless Level Transmitter WLT420 100-12 Issue 1.20 5 Dec, 2007 © Copyright... -
Page 13: Appendix B Creating The Level To Volume Formula
Hydrological Services Pty Ltd Appendix B Creating the Level to Volume Formula The WLT420 has the facility to display the water volume (of a reservoir) as a function of the water level. The function implemented is a 4 order polynomial. This appendix shows how to generate the formula from a “level : volume”... - Page 14 Hydrological Services Pty Ltd Click on one of the graph points, then right click and select “Add trendline…” Click on Polynomial and increase “Order” to 4 (to create a 4 order polynomial) Click on the “Options” tab. Select “Set intercept =” and then enter the water volume when the water level is 0.00m...
- Page 15 + 165.76 x - 19.588 x + 0.000 (where x is the water depth in metres) For this example, the polynomial terms entered into the WLT420 are as follows : (Please note the sign of each term !!!!!) Poly0 = 0.000...
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