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Hydrological Services Pty Ltd

Wireless Level Transmitter

WLT420 100-7

Issue 1.20 5 Dec, 2007

2.2 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 :

•

Hold the antenna coax cable firmly and unscrew the antenna body.

•

Remove the nut and washer from the antenna body and put onto the coax cable.

•

Drill a 10mm mounting hole.

•

Insert the coax cable through the mount hole – from the inside of the enclosure.

•

Screw the antenna body back onto the coax cable.

•

Insert the antenna into the mounting hole and slide the washer and nut onto the
antenna body and tighten the nut.

2.3 Power

Supply

The Wireless Level Transmitter requires a 12V power source, such as a 7Ah lead acid
battery. The transmitter has 2 basic states, sleep and warm up.

Tx Mode

Current Consumption

Sleep 0.15A
Warm Up

10mA + measured 4-20mA

The Wireless Level Receiver also requires a 12V power source, such as a 7Ah lead acid
battery. The receiver has 4 basic states.

Rx Mode

Current Consumption

Sleep (with no 4-20mA power)

0.1mA

Sleep (with 4-20mA power)

0.6mA

LCD on (backlight off)

20mA

LCD on (backlight on)

75mA

Содержание WLT420

Страница 1: ...Pty Ltd 1 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 ...

Страница 2: ... Overview 3 2 Installation 4 2 1 Hardware Connections 4 2 2 Antenna Mounting 7 2 3 Power Supply 7 3 Operation 8 3 1 Transmitter LED 8 3 2 LCD Navigation 8 3 3 Displaying Water Volume 10 4 Specification 11 4 1 Hardware Specification 11 Appendix A Connecting a WL1200W Transducer 12 Appendix B Creating the Level to Volume Formula 13 ...

Страница 3: ...ll ultra low power and reliable wireless 4 to 20mA transmitter receiver pair that can be used in harsh environments for extended periods The Wireless Level Transmitter s primary purpose is to periodically measure a 4 20mA transducer and to wirelessly transmit the measurement to a different location and reproduce the 4 20mA signal This is done with a very low power consumption typically 150uA while...

Страница 4: ...lease lever if fine wire is used This lever is also used to remove the wire 1 2 3 4 5 6 8 7 0 off 1 on 4 0 AUS 1 US Freq 0 1 2 3 4 5 6 7 1 0 1 0 1 0 1 0 1 2 0 0 1 1 0 0 1 1 3 0 0 0 0 1 1 1 1 TxInt cnt 1 15 60 5 0 1 0 1 6 0 0 1 1 WarmUp 2 5 10 15 7 0 1 0 1 8 0 0 1 1 DIP Switches 1 2 3 set the transmission frequency and DIP switch 4 sets the frequency band for USA and Australia 0 905 5MHz 917 5MHz 1...

Страница 5: ...oved from the transducer the data is transmitted and the LED flashed The Wireless Level Transmitter then goes to sleep during the Transmission Interval to conserve the battery power The cycle then repeats at the end of the transmission period of 1 15 or 60 mins When the transmission period is set to continuous the cycle repeats without going to sleep On Off On Transducer Power Warm Up 2 5 10 15 Se...

Страница 6: ...y the external 4 20mA power DIP Switches 1 2 3 set the transmission frequency and DIP switch 4 sets the frequency band for USA and Australia 0 905 5MHz 917 5MHz 1 906 5MHz 918 5MHz 2 907 5MHz 919 5MHz 3 908 5MHz 920 5MHz 4 909 5MHz 921 5MHz 5 910 8MHz 922 5MHz 6 911 9MHz 923 5MHz 7 912 5MHz 924 5MHz 1 2 3 4 0 off 1 on 4 0 AUS 1 US Freq 0 1 2 3 4 5 6 7 1 0 1 0 1 0 1 0 1 2 0 0 1 1 0 0 1 1 3 0 0 0 0 ...

Страница 7: ...le through the mount hole from the inside of the enclosure Screw the antenna body back onto the coax cable Insert the antenna into the mounting hole and slide the washer and nut onto the antenna body and tighten the nut 2 3 Power Supply The Wireless Level Transmitter requires a 12V power source such as a 7Ah lead acid battery The transmitter has 2 basic states sleep and warm up Tx Mode Current Con...

Страница 8: ...ceived When a message is received the status LED on the WLT420R Receiver will flash 3 1 Transmitter LED The transmitter LED indicates what state the transmitter is in LED Description Flashes every 2 secs Transmitter is asleep Flashes fast Transducer has power applied in warm up mode On Steady Measuring transducer 4 20mA for 1 sec then transmits result 3 2 LCD Navigation Press either button to wake...

Страница 9: ...ev 1 00 Set Level 1 200m Rem BatV 12 9V Rem S W Rev 1 00 4 20mA 4 923mA Range 10m Last Rx 00 00 05 TxIntval 1 min WarmUp 5 Secs Sel 5 sec Sel 5 sec Sel 5 sec Sel 5 sec Sel 5 sec Sel 5 sec Zero Offset Select Select Edit Range Edit Set Level VolDsply Enabled Select Edit Volume Display Enabled Disabled Volume 3716 3 Ml Sel 5 sec Poly 0 0003 2 Poly 4 1234 5 Select Edit Polynomial Term 0 Select Edit Po...

Страница 10: ...he Scroll button and step to the WaterLvl menu Press and hold the Select button for 5 secs until the SetLevel menu appears Press the Scroll button twice and advance to the VolDsply Press the Select button to start the Disabled flashing Press the Scroll button to select Enabled flashing Press the Select button to stop the flashing Press Scroll button to save the VolDsply enabled feature Press the S...

Страница 11: ...indicator WLT420R Receiver Status LED 8 char x 2 line LCD Displays Water Level Volume Battery Voltage Controls WLT420R Receiver Scroll Select pushbuttons Connections Screwless Terminals Radio Frequency US 905 5 to 912 5MHz AUS 917 5 to 924 5MHz Transmit Power 10mW Range 1km 0 62 miles line of sight Dimensions 125mm x 80mm x 57mm L x W x D Weight WLT420T Transmitter with aerial 600 grams WLT420R Re...

Страница 12: ...Hydrological Services Pty Ltd Wireless Level Transmitter Copyright WLT420 100 12 Issue 1 20 5 Dec 2007 Appendix A Connecting a WL1200W Transducer Transducer Earth Screen Transducer Green Blue Brown ...

Страница 13: ...ate the formula from a level volume data table After a site survey a table of data equating water level in metres to water volume in mega litres should be entered into an Excel spreadsheet as shown This procedure assumes the water volume is always in mega litres Select the data then click on the Chart Wizard or select the menu item Insert Chart Click on XY Scatter and click finish This will automa...

Страница 14: ...7 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 4th order polynomial Click on the Options tab Select Set intercept and then enter the water volume when the water level is 0 00m Select Display equation on chart Click OK ...

Страница 15: ... 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 term for x0 which is the intercept Poly1 19 588 term for x1 which is just x Poly2 165 760 term for x2 Poly3 18 957 term for x3 Poly4 0 8065 term for x4 As the water level now changes between 0 000m and 10 000m the water volume of the reser...

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