P:\Waterlog\H352-1(Fluid)\Manual\User Manual v15\MasterDoc
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1. Where AA AA Stage feet inches meters etc BB BBBB Pressure PSI CC C Temperature C DD D Power Supply Voltage Volts e 5 2 SDI 12 Command and Response Protocol WATERLOG H 3521 Example of a H 3521 aM1 command Command Response Time Values Description aM1 a0044 lt cr gt lt 1f gt 4sec 4 Make measurement Subsequent Command Response abo a AA AAAA BB B CCCCCCC CC DDDDDDD DD lt cr gt lt 1f gt Where AA AAAA Pressure PSI BB B Temperature C CCCCCCC CC Raw Pressure A D Counts DDDDDDD DD Raw Temperature A D Counts War ERL G H 3521 SDI 12 Command and Response Protocol 5 3 5 2 Concurrent Measurement Command This is a new command since the release of Version 1 2 SDI 12 Specification A concurrent measurement is one which occurs while other SDI 12 sensors on the bus are also taking measurements This command is similar to the aM command however the nn field has an extra digit and the sensor does not issue a service request when it has completed the measurement Communicating with other sensors will NOT abort a concurrent measurement Data values generated in response to this command are stored in the sensor s buffer for subsequent collection using D commands The data will be retained in the sensor until another M C or V command is executed Command Response Description ac atttnn lt cr gt lt lf gt Initiate measurement Where a is2. Offset This option is for displaying the current stage offset value and also for editing the stage offset value manually The following prompt appears at the bottom of the menu Enter Option gt Enter Offset Valuel Enter the desired stage offset value and press the ENTER key to input the value The War ERLOG H 3521 Simple RS 232 Menu Interface 4 3 screen will refresh and show the new offset You must make a new measurement M to see the results of the new offset 4 3 7 U Slope This option is for displaying the current stage slope and also for editing the stage slope The following prompt at the bottom of the menu Enter Option gt Enter Slope Valuel Enter the new stage slope and press the Enter key to input the value The screen will refresh and show the new slope You must make a new measurement M to see the results of the new stage slope Note When the stage slope is set to 2 3067 then the label PSI to Feet is appended to the slope value and when the slope is set to 0 70308 then the label PSI to Meters appears 4 3 8 C Averaged Measurements This option is for displaying the current Averaged Measurements Meancount value and for editing the value The option also displays the estimated time that the measurement will take due to the amount of averaging The following prompt at the bottom of the menu Enter Option gt Averaged Measurements Enter the new averaged measurements meancount and p
3. Set Current Stage command Command Response Time Values Description TXSS 231 a0061 lt cr gt lt lf gt 6sec 1 Set the Stage to 2 3 Subsequent Command Response Description apo a 12 80 lt cr gt lt 1f gt The new Offset 2 10 2 4 20mA Output The H 3521 has a 12 bit digital to analog converter DAC precision voltage reference and a 4 20mA current transmitter The SDI 12 and 4 20mA sections are isolated from each other with a high voltage digital opto coupler The Stage is scaled into a 12 bit value and loaded into the digital to analog converter to control the current transmitter The 4 20mA output is updated whenever a measurement is made If no measurements are made the 4 20mA output becomes stale For industrial applications where the H 3521 is connected to a SCADA or PLC system instead of a SDI 12 data logger the H 3521 can be programmed to automatically make continuous measurements To program the H 3521 to make continuous measurements issue an extended SDI 12 command and set Power_Mode 3 See Chapter 4 for details This setting can be made at the factory 1f requested Note When the H 3521 is first powered up the output current is set to 4 0mA It remains at 4 0mA until the first measurement sequence The digital to analog converter is powered from the loop side of the opto isolator If the loop power is disconnected or is applied after the SDI 12 side is powered up the data in the digital to analog converter will
4. p Is a polarity sign or d d represents numeric digits before and or after the decimal A decimal may be used in any position in the value after the polarity sign If a decimal is not used it will be assumed to be after the last digit For example 3 29 23 5 25 45 300 If one or more values were specified and a aDO returns no data lt CR gt lt LF gt only it means that the measurement was aborted and a new M command must be sent Example of a H 3521 aD0 command Previous Command Response aM a0064 lt cr gt lt 1f gt Subsequent Command Response aDO a AA AA BB BBBB CC C DD D lt cr gt lt lf gt Where AA AA Stage feet inches meters etc BB BBBB Pressure PSI CC C Temperature C DD D Power Supply Voltage Volts War ERL G H 3521 SDI 12 Command and Response Protocol 5 5 5 4 Continuous Measurements This 1s a new command for the Version 1 2 SDI 12 Specification Sensors that are able to continuously monitor the phenomena to be measured such as a cable position do not require a start measurement command They can be read directly with the R commands RO R9 The R commands work exactly like the D DO D9 commands The only difference is that the R commands do not need to be preceded with an M command The H 3521 does not support the aRO continuous measurement commands because the measurement and math operations require several seconds to complete 5 5 Se
5. 1 2 Check The Model Number Before installing your new WATERLOG H 3521 check the information on the label of the sensor enclosure Check the model number the range and the output type to be sure that you have received the instrument you ordered The label will look similar to the following H 3521 Model Fluid Pressure Sensor 1103 0 15 PSI 34 6 H20 SDI 12 RS 232 Modbus 4 20mA 10 to 16 0 Volts This example shows that the WATERLOG H 3521 measures pressure within the range from zero to 15 psi WATERLOG 17 3521 1 2 Introduction SERIES Chapter 2 Installation 2 1 Installing the WATERLOG H 3521 The WATERLOG H 3521 is a digital pressure transducer specifically designed for water level monitoring The H 3521 directly measures water or other fluid pressure over a broad temperature range Typical applications include monitoring snow pillows to measure snow pack measurement of water in accumulating rain gauges and fluid pressure in weirs and dams Before proceeding with the installation please consider several site preparation and maintenance issues Figure 4 Sensor and Cable 2 2 Water Depth The following chart shows the maximum pressure to which the H 3521 is factory calibrated The sensor can survive temporary operation up to twice the maximum rated pressure for you model s range However any measurements made beyond the rated pressure will be inaccurate The H 3521 will be damaged if it is subjecte
6. 16 The factory default ttt field is computed internally by the H 3521 as follows Raw Measurements 2 13 sec 0 133 sec measurement X 16 measurements Math Overhead 0 3 sec Round Upwards 1 0 ttt 3 0 Seconds The aXRMC and aXWMC extended commands allow the number of raw sensor measurements for each SDI 12 measurement sequence to be monitored or changed Once a new Mean_Count value is written a copy is sent to the sensor data buffer for verification This data can be viewed by using a subsequent D command To read or verify the value any other time use the XRMC command Command Response Description aXRMC a001ll lt cr gt lt lf gt Read Mean_Count aXWMCn a001l lt cr gt lt lf gt Write Mean_Count Where a is the sensor address 0 9 A Z a z XRMC are upper case characters XWMC are upper case characters n is the number of raw measurements wanted This command takes 001 seconds to complete and places 1 value in the data buffer Use the aDO command to collect and view the current value 5 16 SDI 12 Command and Response Protocol WATERLOG H 3521 Example of a H 3521 Extended Read Mean_Count command Command Response aXRMC a0011 lt cr gt lt 1f gt Command Response aDO a 8 lt cr gt lt lf gt Time Values Description 1 sec 1 Read Mean_Count Description Count 8 Example of a H 3521 Extended Write Mean_Count command Command Respons
7. 20mA_Hi and make new measurement Command Response Description apo a 34 6 lt cr gt lt 1f 4 20mA_Hi is 34 6 War ERLOG H 3521 SDI 12 Command and Response Protocol 5 13 5 13 Extended Read Power_Mode and Write Power_Mode The quadrature 0 5V and 4 20mA outputs are updated whenever a measurement is made For industrial applications such as 4 20mA where the H 3521 is connected to a SCADA or PLC system and low power is not of concern the H 3521 can be programmed to make continuous measurements This command is used to change the power mode The H 3521 comes from the factory with the power mode set to the Sleep mode Once a new value is written a copy is sent to the sensor data buffer for verification This data can be viewed by using a subsequent aDO command To read or verify the value any other time use the XRPM command Command Response Description aXRPM a0011 lt cr gt lt l1f gt Read Power_Mode aXWwPMn a0011 lt cr gt lt lf gt Write Power_Mode Where a is the sensor address 0 9 A Z a z 9 XRPM are upper case characters XWPM are upper case characters n 1s the new setting 0 3 or 4 0 Sleep between measurements 1 Sleep with sensor bias On reserved for factory use 2 Sleep with sensor bias and reference On reserved for factory use 3 Make measurements and update all outputs based on measure rate 4 Power profile for Modbus This command takes 001 seconds to c
8. Command 0 0 ccc eee eens 5 10 5 9 Extended Read Write Offset and Read Write Slope 0 0c ccc ene 5 11 5 10 Extended Read Write Stage Digits 0 2 0 eee nena 5 12 5 11 Extended Read Write 4 20mA_Hi and Read Write 4 20mA_Lo 0004 5 13 5 12 Extended Read Power_Mode and Write Power_Mode 000 ccc eens 5 14 5 13 Extended Read Measure Rate and Write Measure Rate ooo o oooooooommm 5 15 5 14 Extended Read Mean_Count and Write Mean_Count oooooooooooomoo 5 16 5 15 Extended Read Write NOAA Mode Enable ooooooooooooooo o 5 18 IO Extejd d OES see ate ete cag bt di de bd Selah ss 5 19 5 17 Extended XDBR ada basa rta do al alee eae ha Es os 5 19 5 18 Extended Ae NG tarso lead de dy oe Gite ald tied sce Oe Ay eos lehe 5 19 Appendix A Specifications 0 0 0 0 0 00 00 ete tent e nee A 1 Appendix B Modbus Protocol Bek Modbus Intertace seu sieges epee vA Pee ta aes Reo Po dade Saeed ld wa ee ds B 1 B 2 Modbus RTU Transmission B 1 B 3 Modbus Function Codes B 1 T 2 Table of Contents WAT ER L G i H 3521 SERIES BA Holdi o Register ia a didas B 2 BAO LD Sinmg RO oy coved ede ais is tdi ee eases B 2 B 4 1 Modbus Address R W 2 0 0 0 cece o B 2 B 4 2 Stage Units Select R W soon ese cb ie b4 eben Ae ea aes OER ES B 3 B43 Reserved R W Terrei list ba ea ee ch be eh Sa telde B 3 B 4 4 Modbus Baud rate R W 0000 eee ooo ooo B 3 BAS Pan
9. River Heights Utah http www sdi 12 org Note The H 3521 incorporates V1 3 with the exception of the CRC request During normal communication the data recorder sends an address together with a command to the H 3521 SDI 12 sensor The H 3521 then replies with a response In the following descriptions SDI 12 commands and responses are enclosed in quotes The SDI 12 address and the command response terminators are defined as follows a Is the sensor address The following ASCII Characters are valid addresses 0 9 A Z a z 2 Sensors will be initially programmed at the factory with the address of 0 for use in single sensor systems Addresses 1 to 9 and A to Z or ato z can be used for additional sensors connected to the same SDI 12 bus Address and are wild card addresses which select any sensor regardless of its actual address nn Is the last character of a command block lt cr gt lt lf gt Are carriage return OD hex and line feed OA hex characters They are the last two characters of a response block Notes All commands responses are upper case printable ASCII characters Commands must be terminated with a character Responses are terminated with lt cr gt lt lIf gt characters The command string must be transmitted in a contiguous block with no gaps of more than 1 66 milliseconds between characters War ERLOG H 3521 SDI 12 Command and Response Protocol 5 1 5 1 Measu
10. instrument should be fastened to a gauge station shelf or fixed such that the elevation cannot accidently change Because the surface of the water being measured is exposed to atmospheric pressure the pressure sensor must provide correction for changes in barometric air pressure To provide the best accuracy possible the H 3521 uses an atmospheric referenced pressure sensor design The internal pressure sensor in the H 3521 has a vent tube connected to the back side its pressure diaphragm The vent tube is routed to a sintered bronze filter next to the pressure port Make certain the gauge station enclosure is open to the atmosphere If the sensor is placed in a cabinet or sealed enclosure the cabinet must have a screened vent or other opening to the atmosphere 2 2 Installation WATERLOG H 3521 SERIES 2 5 Making Connections to the Pressure Port The H 3521 has a 1 8 female NPT pressure port for making connections to your pressure source Apply Teflon tape or anaerobic thread dope to help prevent leaks The pressure port has a stainless steel plate to prevent the port fitting from spinning in the housing Make certain the Keeper plate is in proper position Whenever possible use a backup wrench to avoid damaging the enclosure Before tightening the pressure port connection bleed any air from the supply line Trapped air in the supply line will slowly dissolve into the water as it does the density of the water column changes from air t
11. lt cr gt lt l1f gt NOAA Mode disabled Example of a H 3521 Extended Write NOAA Mode Enable command Command Response Time Values Description aXWNE1 a20061 lt cr gt lt 1f gt 6sec 1 Enable NOAA Mode Command Response Description apo a l lt cr gt lt lf gt NOAA Mode enabled Example of a H 3521 aM command in NOAA Mode Command Response Time Values Description aM a001l lt cr gt lt lf gt 1sec 1 Measure in NOAA Mode Command Response Description aDO a AA AA lt cr gt lt 1f gt Returns Stage e 5 18 SDI 12 Command and Response Protocol WATERLOG H 3521 5 17 Extended XTEST This command is used for installation or production testing and requires the use of a H 4191 Sidekick interface and a PC This command causes the H 3521 to transmit unsolicited real time data for testing purposes The test mode is used to help troubleshoot the installation by providing a continuous readout of pressure data This is not compliant with the SDI 12 specification and is not used with data loggers To activate the test mode send the command aXTEST from the PC The H 3521 will enter the test mode and make continuous measurements The test mode is exited by sending a break or any new command on the SDI 12 bus It may take a few tries to exit if the command is sent at the same time data is being sent from the H 3521 Removing power from the H 3521 also causes it to exit this mode Format SensorAdr Stage Pr
12. will be available using subsequent D commands aV command Example of a Command Response Time Values Description av a0014 lt cr gt lt 1f gt lsec 4 Return fixed data and diagnostic data for testing purposes Subsequent Command Response aDO a 123 1456 78 9 ddddd y lt cr gt lt 1f gt Key Description Units 123 456 Fixed test data 78 9 Fixed test data ddddd ROM checksum value 0 99999 y ROM checksum test 0 Failed 1 Passed War ERL G H 3521 SDI 12 Command and Response Protocol 5 7 5 7 Send Identification Command The Send Identification Command responds with sensor vendor model and version data Any measurement data in the sensor s buffer is not disturbed Command Response Mary allccccccccmmmmmmvvvxx xx lt cr gt lt lfi gt Where a is the sensor address 0 9 A Z a z 9 I is an upper case ASCII character 11 is the SDI 12 version compatibility level e g version 1 2 is represented as 12 ccccccce is an 8 character vendor identification to be specified by the vendor and usually in the form of a company name or its abbreviation mmmmmm is a 6 character field specifying the sensor model number vvv is a 3 character field specifying the sensor version number XX XX is an optional field of up to a maximum of 13 characters to be used for serial number or other specific sensor information not relevant to operation of the data recorder Example of a aI comma
13. with the option changed 4 4 4 R Measure Rate This option is a hidden menu option that is only available when the H 3521 is on power mode 3 This option is viewing and editing the current measure rate value After pressing the R key the user will see the following prompt at the bottom of the menu Enter Option gt Measure Rate 0 255 Jmin Then the user can enter in the desired measure rate After entering the desired measure rate press the ENTER key to submit the value and then the screen will refresh with the option changed if the value was valid If the user does not want to change the measure rate then press the ESC key to abort 4 4 5 D Reset to Defaults This option will reset the H 3521 back to factory user defaults The following message will be displayed Enter Option gt Resetting to Defaults 4 6 Simple RS 232 Menu Interface WATerRL G H 3521 SERIES 4 5 Sensor Output Options Menu This setup menu is for viewing and editing the current settings of the 4 20mA output H 3521 Fluid HyperT erminal A ES File Edit View Call Transfer Help Dll als alal 2l Sensor Output Setup Menu 4 20mA Output Options Slope 462427 M Max Stage 34 60 N Min Stage 0 00 U Update Outputs Enter Option gt _ a kalm Connected 0 04 28 T100 9600 8 N 1 SCROLL CAPS NUM Capture Printecho 4 5 1 Slope This is the current slope that the H 3521 has calculated based on the max and min stag
14. ALYSIS BE LIABLE FOR ANY CLAIMS LIABILITY OR DAMAGES ARISING FROM MODIFICATION MADE THEREIN OTHER THAN BY DESIGN ANALYSIS iv THIS LIMITED WARRANTY GIVES USER SPECIFIC LEGAL RIGHTS USER MAY ALSO HAVE OTHER RIGHTS WHICH VARY FROM STATE TO STATE SOME STATES DO NOT ALLOW LIMITATIONS ON HOW LONG AN IMPLIED WARRANTY LASTS OR THE EXCLUSION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES SO THOSE LIMITATIONS OR EXCLUSIONS MAY NOT APPLY 6 GOVERNING LAW This Agreement and its validity and interpretation shall be governed by the laws of the State of Utah notwithstanding any choice of law rules of Utah or any other state or jurisdiction Wa e W 2 User Agreement WATERLOG Warranty ATER LOG H 3521 Table of Contents User Agreement WATERLOG Warranty nannu nunnurnar ee cence W l Chapter 1 Introduction UA A e ee eae Ss ee tatty 1 1 CI Unpacking eiee aata E ae D aie oan a we A 1 2 12 Check The Mode NUMBER sn cok id NO a e al a Nie CS a ft 1 2 Chapter 2 Installation 2 1 Installing the WATERLOG H 3521 Fluid oooooooooomoomoommmss o 2 1 22 Water Depth siesepien ieee e s gegen Ace wary are AAG we E ENT E ae we 2 1 2 3 General Installation Recommendations 04 0642 64 A A A E 2 2 2 Instr ment een ad twice ee Oe AAA AA 2 2 2 5 Making Connections to the Pressure Port 0 0 0 eee eee eee eee ene 2 3 2 6 Connecting Your Data Logger esti AS oS RIG A oP RN OEMS 2 4 201 SDE Interface o Yes aie aos Se Be IS LA Pea a
15. Model H 3521 Liquid amp Gas Compatible Pressure Sensor with SDI 12 4 20mA and Modbus Outputs WATERL G SERIE St Owner s Manual Version 1 5 DESIGN ANALYSIS ASSOCIATES INC 75 West 100 South Logan Utah 84321 Phone 435 753 2212 Fax 435 753 7669 Web http www waterlog com E mail waterlogO waterlog com User Agreement WATERLOG Warranty 1 NATURE OF THE PRODUCT This agreement accompanies a pressure measuring system comprising firmware circuitry and other electronic equipment in an enclosed housing and packaged together with written instructional materials The packaged electronic circuitry and instructional materials herein are collectively referred to as the PRODUCT The PRODUCT is made available from DESIGN ANALYSIS ASSOCIATES INC of 75 West 100 South Logan Utah 84321 hereinafter referred to as DESIGN ANALYSIS and contains information and embodies technology that is confidential and proprietary to DESIGN ANALYSIS and the availability and use of the PRODUCT is extended to you the USER solely on the basis of the terms of agreement which follow 2 ACKNOWLEDGMENTS BY USER Opening the package which encloses the accompanying PRODUCT indicates your acceptance of the terms and conditions of this agreement and constitutes an acknowledgment by you of the confidential and proprietary nature of the rights of DESIGN ANALYSIS in the PRODUCT 3 DUTIES OF YOU THE USER In considerati
16. OM within the sensor Once the new Slope or Offset value is written to the EEPROM a copy is sent to the sensor data buffer for verification This data can be viewed by using a subsequent D command To verify these settings any other time use the XRS or XRO commands This command takes 001 seconds to complete and places 1 value in the data buffer Use the aDO command to collect and view the new slope or offset Command Response Description aXRS a001l1l lt cr gt lt lf gt Read Slope aXRO a0011 lt cr gt lt lf gt Read Offset axwSddd a0061 lt cr gt lt lf gt Write Slope aXWOddd a0061 lt cr gt lt lf gt Write Offset Where a is the sensor address 0 9 A Z a z XRS are upper case characters XRO are upper case characters XWS are upper case characters XWO are upper case characters ddd is the new slope or offset value For example 20 0 195 Example of a H 3521 Extended Read Slope command Command Response Time Values Description aXRS a0011 lt cr gt lt lf gt lsec 1 Read Slope Command Response Description aDO a 1 00 lt cr gt lt 1f gt Slope is 1 00 Example of a H 3521 Extended Write Slope command Command Response Time Values Description aXWS1 234 a0061 lt cr gt lt 1f gt 6sec 1 Write Slope Command Response Description apo a 1 234 lt cr gt lt 1f gt Slope is 1 234 War ERLOG H 3521 SDI 12 Command and Response P
17. age by writing the current stage value to this register Reading this register is not applicable This holding register is a 64 bit holding register therefore the value sent to write to this register must be in a 64 bit floating point number format As shown in the table there is also a 32 bit floating point number register for this command Example Reading Holding Register Command Format aabbceceddddeeee Where aa l byte Modbus address bb 1 byte function code ccce 2 byte start address dddd 2 byte quantity of registers eeee 2 byte crc check example 010300010001xxxx Example Writing Single Holding Register Command Format aabbceceddddeeee Where aa 1 byte Modbus address bb 1 byte function code ccce 2 byte start address dddd 2 byte or dddddddd 4 byte register data value eeee 2 byte crc check example 010600010001xxxx Example Reading Input Register Command Format aabbceceddddeeee Where B 5 Input Registers B 4 Modbus Protocol aa 1 byte Modbus address bb 1 byte function code ccce 2 byte start address dddd 2 byte quantity of registers eeee 2 byte crc check example 010400010001xxxx WATERLOG 17 3531 SERIES The input registers of the H 3531 FlashLite hold the measurement data When the user sends a read command to read an input register the register read initiates a measurement sequence and returns the updated value Note The measuremen
18. as long as there are no other SDI 12 devices on the SDI 12 bus WATERLOG H 3521 SERIES Maintenance 3 1 Chapter 4 Simple Menu Interface 4 0 Simple Menu Interface The H 3521 has a RS 232 interface which is convenient for setup and testing This chapter is a description of the Simple Menu interface Included is a description of the menu and each setup option 4 1 Connecting to the H 3521 The Simple Menu interface is designed to work with a terminal program such as Hyper Terminal Procom or other similar terminal programs The following table shows the settings that are needed for communication with the H 3521 COMMUNICATION H 3521 SETTINGS SETTING BAUD RATE DATA BITS STOP BITS PARITY None DUPLEX Full TERMINAL EMULATION VT 100 FLOW CONTROL Software Xon Xoff After the computer is connected pressing any key ONCE while the H 3521 is in sleep mode will cause the H 3521 to wake up make a new measurement and print the following message Stage X XX Temp XX X When the ENTER key is pressed after the H 3521 is awake it will invoke the H 3521 Simple Menu You will see a Measuring message displayed as the H 3521 makes a fresh measurement Then the H 3521 will display the Simple Menu as shown on the following page War ERLOG H 3521 Simple RS 232 Menu Interface 4 1 4 2 General Operations The H 3521 settings can be made either via the Simple Menu or with extend SDI 12 commands T
19. be lost When the loop power is restored the 4 20mA output will be at an unknown value Once a fresh SDI 12 measurement is made the digital to analog converter is loaded with new valid data 2 10 3 Programming the 4 20mA Output Range The H 3521 scales the current Stage data to drive the 4 20mA output The 4 20mA_Hi and 4 20mA_Lo settings control how the Stage data is processed The 4 20mA_Lo should be set to the desired Stage corresponding a 4 00mA output The 4 20mA_Hi should be set to the desired Stage corresponding to a 20 00mA output For testing purposes the H 3521 comes from the factory with 4 20mA_Hi 20 0 and 4 20mA_Lo 4 00 See Chapter 4 for details on programming these settings The extended aXS command allows convenient testing of the 4 20mA output This command allows the user to temporarily force the Stage to a test value For example the user can force the Stage to several different values while calibrating or monitoring the attached 4 20mA instrumentation Once a fresh measurement is made via a SDI 12 measurement the temporary Stage data is overridden 2 8 Installation WATERLOG H 3521 SERIES 2 11 Testing Before installing the H 3521 in your field location you may wish to first test the sensor and data logger in your shop or lab This allows you to become familiar with H 3521 and the data logger in a controlled environment The H 3521 can be tested with a pressure standard or water filled standpipe However fo
20. d to twice the maximum rated pressure Pressure Range Water Depth Range H 3521 15 0 to 15 psi 0 to 34 60 ft 0 01 ft H 3521 30 0 to 30 psi 0 to 69 20 ft 0 02 ft NOTE Depth calculations are derived from the standard equation that one PSI is generated by a column of water 27 680 inches deep at 39 4 F WATERLOG H 3521 Installation 2 1 2 3 General Installation Recommendations The H 3521 pressure transducer is not recommended for use in applications where silt and mud are problematic In addition if the sensor is used in a shallow water application and happens to dry out with mud coating the sensor diaphragm the diaphragm compliance will be altered and the factory calibration spoiled The H 3521 sensor will be permanently damaged if it is frozen Transducers which are installed in geographical areas with harsh winters should be removed for the winter unless they are installed in a heated shelter or are used with ethylene glycol or other antifreeze media 2 4 Instrument Shelter The sensor should be installed in a protected dry location such as an instrument shelter The installation should provide easy access and facilitate regular inspection and maintenance Care should be taken to place it where it will not be jarred or dropped the H 3521 is a precision instrument Normally the H 3521 is mounted with the 4 corner feet on a level surface Normally the H 3521 is used to measure the hydrostatic head of a water source The
21. e axwMc4 a0021 lt cr gt lt lf gt Command Response Time Values Description 2 sec 1 Write Mean_Count Description abo a 4 lt cr gt lt lf gt WATERL G H 3521 Count 4 SDI 12 Command and Response Protocol 5 17 5 16 Extended Read Write NOAA Mode Enable The H 3521 can be put into a NOAA Mode In NOAA mode the data collection platform requests data from the H 3521 every second for 3 minutes and then is idle for 3 minutes When NOAA Mode is enabled the H 3521 measurement response time is less than 1 second Meaning that the Data command can be sent within 1 second after the measure command is issued When the enable value is set to a 1 the NOAA Mode is enabled and when it is set to a 0 NOAA Mode is disabled Command Response Description aXRNE a0011 lt cr gt lt 1f gt Read NOAA Mode enable aXWNEd a0061 lt cr gt lt 1f gt Write NOAA Mode enable Where a is the sensor address 0 9 A Z a z 9 XRNE are upper case characters XWNE are upper case characters d is the new enable value O disabled 1 enabled When the user enables NOAA Mode it takes 6 seconds because it updates the Atmospheric and Temperature values until the 3 minute no activity gap Example of a H 3521 Extended Read NOAA Mode Enable command Command Response Time Values Description aXRNE a0011 lt cr gt lt lf gt lsec 1 Read NOAA Mode Enable Command Response Description apo a 0
22. e 4 Wait mode Power profile for Modbus The menu will refresh with the new power mode 4 4 2 F Fast Mode This option is the enable for putting the H 3521 in a special mode called Fast Mode Fast Mode causes the H 3521 to complete measurements in 1 second vs the normal mode which takes about 6 seconds This mode is not recommended because the atmospheric pressure and temperature values are only updated every 3 minutes and the H 3521 does War ERLOG H 3521 Simple RS 232 Menu Interface 4 5 not average as many measurements When in this mode the Meancount A veraged measurements value are not used But if there is an application where the user needs the H 3521 to measure that fast this mode does work Therefore the user may lose some accuracy using this mode because the H 3521 is calibrated in the normal mode with the atmospheric pressure and temperature measured every measurement After pressing the F key the screen will refresh with the option changed 4 4 3 N NOAA Mode This options is the enable for putting the H 3521 in NOAA Mode NOAA Mode causes the H 3521 to complete measurements in less than 1 second This mode is for NOAA applications where the data collection platform requests a measurement second for 3minutes and then requests no measurements for 3 minutes When in this mode the Meancount A veraged measurements variable is not used But this is a requirement for NOAA application After pressing the N key the screen will refresh
23. e values 4 5 2 M Max Stage This setting is the stage value high that corresponds to a 20mA output The following message is displayed Enter 4 20mA Max Stagel Enter the desired Stage value which corresponds to a 20 00mA output and press ENTER to submit the value Refer to Chapter 5 for more details about this setting 4 5 3 N Min Stage This setting is the stage value low that corresponds to a 4 0mA output The following message is displayed Enter 4 20mA Min Stage WATERLOG H 3521 Simple RS 232 Menu Interface 4 7 Enter the desired Stage which corresponds to a 4 00mA output and press ENTER to submit the value Refer to Chapter 5 for more details about this setting 4 5 4 U Update Outputs This option is used to force the H 3521 to make a new measurement and update any enabled outputs The following message is displayed Enter Option gt Measuring 4 8 Simple RS 232 Menu Interface WAaTerRL G H 3521 SERIES Chapter 5 SDI 12 Command and Response Protocol 5 0 SDI 12 Command and Response Protocol This is a brief description of the Serial Digital Interface SDI 12 Command and Response Protocol used by the WATERLOG Series Model H 3521 sensor Included is a description of the commands and data format supported by the H 3521 Refer to the document A SERIAL DIGITAL INTERFACE STANDARD FOR MICROPROCESSOR BASED SENSORS Version 1 3 July 25 2004 Prepared by the SDI 12 Support Group 165 East 500 South
24. ecorder The Serial Digital Interface is ideal for data logging applications with the following requirements Battery powered operation with minimal current drain Pressure measurement data is transmitted digitally over long cable lengths without error Multiple sensors on a simple three wire cable Up to 250 feet of cable between a sensor and the data recorder Use of H 423 SDI 12 to RS485 converter extends the range to 1000 s of feet H 4500 fiberoptic media converter works up to 1 2 miles The H 3521 has the following features Simple to install use and maintain no on site calibration required Performs extremely accurate measurements Linear deviation is less than 0 05 Resolution is 1 part in 1 000 000 Accuracy over temperature range exceeds 0 02 ft of water Enclosure is nonconductive and corrosion proof Stainless steel sensor diaphragm Sensor has an atmospheric vent for compensation of barometric pressure changes Low current operation less than 1 milliamp typical standby Simple RS 232 menu interface for quick and easy setup No external module required Outputs a 4 20mA signal no external module required Extended SDI 12 commands for setting the Stage to the current water elevation WATERL G H 3521 Introduction 1 1 1 1 Unpacking The following is a list of items you should have received WATERLOG H 3521 pressure transducer Main interface cable RS 232 communications cable optional Owner s Manual
25. egisters As shown in Table 2 the response to reading the ID string is sent as a ASCII character string Example to read the full ID string the host must send the request as follows aa030000001 Icrcc H 3531 FlashLite Response 113 DAA H 3531001S 000000V011 lt CR gt lt LF gt 0000 B 4 1 Modbus Address R W This holding register allows the user to change the Modbus address of the H 3531 FlashLite The programmable address range is 1 247 The assigned Modbus address factory default is 1 Address 0 is reserved for the broadcast address meaning that all Modbus sensors will respond to address O B 2 Modbus Protocol WATERLOG H 3531 SERIES B 4 2 Stage Units Select R W This holding register allows the user to change the units of the stage that is reported in the input registers Below shows what values to write to the register to change to the desired units Stage Units Select Register 00 stage in feet 01 stage in meters 02 stage in inches 03 stage in mm 04 stage in cm 05 raw psi 05 user defined factory default B 4 3 Reserved R W This holding register 1s reserved space for future use B 4 4 Modbus Baud rate R W This holding register allows the user to change the baud rate of the RS 485 port This register for H 3531 FlashLite defaults to 00 which is 9600 baud When the user changes the baud rate it does not take effect until the power is cycled The list below sho
26. er opening to the atmosphere 3 3 Offset Drift Unlike sensors which measure dry gas pressure H 350 H 350LITE the H 3521 does not have an internal valve for measuring and removing long term offset drift The pressure sensor is very stable however as with any pressure sensor long term offset drift will occur We recommend that the sensor be factory calibrated on a yearly basis in order to maintain the highest level of accuracy As an alternative the sensor offset can be adjusted in the field using a pressure standard or known hydrostatic pressure as a reference and using the Offset or Set Current Stage commands 3 4 Trouble Shooting Experience over the years with pressure sensors has identified several common problems No SDI 12 response or intermittent data l Check all wiring including power and ground connections Battery connections can become corroded Check for corrosion in the connectors and terminal strips 2 The H 3521 measures and reports it s internal power supply voltage along with Stage and Pressure Make a measurement and check to see if the voltage is between 10 0 and 16 0 Volts 3 Check the connections between your data recorder and the H 3521 sensor 4 Verify that there is not another SDI 12 sensor on the SDI 12 bus with the same SDI 12 address as the H 3521 Try communicating with the H 3521 without any other SDI 12 devices on the bus Sending a or should cause the H 3521 to return its own address
27. eraged Measurements ia A AAA OER OG 4 4 4 39 Mis Med Ur ss cee tech bg a O ead Oe ae alee oR 4 4 AAO TRIG A sn teeth Gary ep Oe eed gt Da el ote wale dn tube te ialas 4 4 4 4 Sensor Mode Options Menu vesrorss sesy vas a oueds AA Sy eas 4 5 4 4 1 P Power Mode 0 ccc ccc cc ee eee eee eee eee nooo ooo 4 5 4 42 E RastMode ii o od ta Dea ks De 4 5 443 N lt NOAA Mode nta A A A id aces 4 6 4 4 4 R Measure Rate vai ss rl bits atodos 4 6 4 4 5 D Reset to Defaults oooooooooorrrr eee nne 4 6 4 5 Sensor Output Options Menus meros rr des 4 7 A Dl VSO Pee A ate eet Rei eee Sate oe e e 4 7 BSD IME Nie Stag ro od di a wee ow a he ae oS 4 7 o IN SAW SASS oth auth ed Neg Sk A E DEN 4 7 4 5 4 U Update Outputs 2i 4k dane a Wi gape GoW aad Yea aes 4 8 Chapter 5 SDI 12 Command and Response Protocol 5 0 SDI 12 Command and Response Protocol 0 0 cece eee ene 5 1 Jel Measure Command its ieee tock hdd bale Re eae es eae oe een 5 2 5 2 Concurrent Measurement Command 0 0 ccc eee teen ene 5 4 5 3 Send DataCommand 0 ccc eee eee e eee eee eens 5 5 5 4 Continuous Measurements nonnen cece ee tenet eens 5 6 5 5 initiate Verify COMMANG 5 24045 Seale RAR SEG ale Meade a Sea ds alae bes aes 5 7 5 6 Send Identification Command 0 eee ene eee eens 5 8 5 7 Change Sensor Address Command 4 4 2 4 04 66 eo y ee O Oa bo ae ea eee 5 9 Extended SDI 12 Commands 5 8 Extended Set Current Stage
28. es SER LA Sake e 2 5 240 2 RS 232 OUP cacao eae ohh AA OUROT METAR OER ORES 2 5 LOLA Oulput A E A AA SER 2 5 2104 Modbus Int rtac eos as ad dat Oa oe 2 5 2 7 Wiring and Installation Precautions 22S Ok ad e Ain a A dd oo 2 6 2 8 Programming Your SDI 12 Data Recorder o oooococoocococococo eee 2 6 2 9 Programming the SDI 12 Address i 00 saa serca Ree boa dae a aa 2 6 2 10 Programming the H 3521 Fluid Sensor 0 0 cee eee eee eee ene 2 6 210 Settna the Stage to ad a A 2 7 2 10 2 4 20mA Output se ica di Pace 2 8 2 10 3 Programming the 4 20mA Output Range o ooooocccocococococooo oo 2 8 ZP nd td da e 448 wee OR dr 2 9 Chapter 3 Maintenance Troubleshooting 3A Maintenance AA O A eg El 3 1 3 2 PreCauliOns Li ASAS ASAS SA A 3 1 O AI tat secs ea cad SY ah asa Se cele ad EESE ae Wea ae ns AY Gath an 3 1 3 4 Troubleshooting sior cance tow sey a ae EER SN 3 1 Chapter 4 Simple Menu Interface 4 0 Simple Mem Interface eey SS GeO SA Ve ES SO ORES 4 1 4 1 Connecting to the H 3521 Fluid a ain hee Sew Balas Kees AA Sees 4 1 4 2 General Operations e a di 4 2 43 Ment Options rt a iD a eds 4 3 4 3 1 P Sensor Mode ptos sir AAA 4 3 4 3 2 V Sensor Output Options tac Uitte a Ae a sag ae Se tlie AS 4 3 4 3 3 A SDI 12 Address ori a a ee OR 4 3 A AO AOS rata oeeae ace 4 3 433 DS DICUS E A SAA a EXER RIES 4 3 WAT ERLOG H 3521 Table of Contents T 1 43 0 O Oi AA A AR AAA A Seeks 4 3 AFANES ti AS AAA AE AAA A 4 4 4 3 8 C Av
29. es from the factory with its address set to 0 The address can be edited using the RS 232 menu interface or using an extended SDI 12 command Refer to chapters 4 and 5 for more details 2 10 Programming the H 3521 Sensor The H 3521 comes from the factory with the following programmable settings SDI Address 0 Slope 2 3067 feet of H 0 Offset 0 00 MeanCount 16 Power_Mode 0 Sleep 4 20ma_Hi 20 0 Ft 4 20mA_Lo 4 0 Ft With these values the Stage will be in units of feet when used in clean water The slope can be changed to accommodate other engineering units such as inches or meters The setups are stored in EEPROM within the H 3521 and will not be lost if the power is disconnected The extended commands for changing these setups are described in detail in Chapter 5 and most of these 2 6 Installation WATERLOG H 3521 SERIES settings can also be changed using the simple RS232 menu see Chapter 4 MeanCount is the number of raw pressure measurements averaged together to make one measurement sequence This setting determines how long the sensor will take to make a measurement MeanCount can be changed as described in chapters 4 and 5 2 10 1 Setting the Stage Many applications use the pressure sensor to measure water level in a gauge or reservoir The sensor translates water pressure to water level When the H 3521 is first installed you will want to adjust the Offset such that the measurement data Stage corresponds
30. essure Temperature RawPressure counts RawTemperature counts XTEST displays the following data 0 41 202 43 222 23 0 412345 467890 0 41 212 43 232 23 0 412345 467890 0 41 222 3 342 23 0 412345 67890 0 41 232 43 352 23 0 12345 67890 0 41 232 43 352 23 0 12345 67890 etc 5 18 Extended XDEF This command is used to set all the user settings back to factory defaults This is useful in troubleshooting when nothings seems to be working 5 19 Extended XCFG This command is used for installation or production testing and requires the use of a H 4191 Sidekick interface and a PC This command returns the current configuration of the H 3521 XCFG displays the following data H 3521 Fluid Configuration 013 DAAH 3521001S 000000V100 Power Mode 0 NOAA Mode Off Mean Count 8 User Slope 2 306700 User Offset 0 000000 Max PSI 20 0 4 20mA Slope 462427 War ERLOG H 3521 SDI 12 Command and Response Protocol 5 19 Accuracy Maximum percent of error in measurement Pressure Less than or equal to 0 03 of full scale output FSO over temperature range referenced to a straight line stretched from zero PSI to maximum pressure Temperature Internal temperature 1 C over temperature range Resolution Smallest change detectable in output signal Pressure 0 001 Temperature 0 001 Linearity Less than 0 03 deviation from a straig
31. fy the above warranty USER must notify DESIGN ANALYSIS in writing within the applicable period specified above and reasonably cooperate with the directions they received from DESIGN ANALYSIS c What DESIGN ANALYSIS Will Do DESIGN ANALYSIS will repair the PRODUCT or will endeavor to provide a replacement of same within a reasonable period of time In the event that DESIGN ANALYSIS is unable to make the necessary repairs or replacement within a reasonable period of time the original purchase price will be refunded upon the return of the PRODUCT to DESIGN ANALYSIS d Limitations 1 THE ENTIRE REMEDY FOR BREACH OF THIS LIMITED WARRANTY SHALL BE LIMITED TO REPLACEMENT OF THE DEFECTIVE PRODUCT OR REFUNDING OF THE PURCHASE PRICE AS SET FORTH ABOVE IN NO EVENT WILL THE LIABILITY OF DESIGN ANALYSIS TO USER OR TO ANY OTHER PARTY EXCEED THE ORIGINAL PURCHASE PRICE OF THE PRODUCT REGARDLESS OF THE FORM OF THE CLAIM 11 EXCEPT FOR THE EXPRESS WARRANTIES ABOVE DESIGN ANALYSIS SPECIFICALLY DISCLAIMS ALL OTHER WARRANTIES INCLUDING WITHOUT LIMITATION ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ii UNDER NO CIRCUMSTANCES WILL DESIGN ANALYSIS BE LIABLE FOR SPECIAL INCIDENTAL CONSEQUENTIAL INDIRECT OR ANY OTHER DAMAGES OR CLAIMS ARISING FROM THE USE OF THIS PRODUCT THIS INCLUDES LOSS OF PROFITS OR ANY OTHER COMMERCIAL DAMAGES EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES IN NO EVENT WILL DESIGN AN
32. h Rating NEMA 4 enclosure Pressure Inlet 1 8 female NPT Atmospheric Vent Sintered bronze 10 32 Connectors H 3521 Amphenol MS3102R165 1P 7 Pin male Cable Amphenol MS3106A16S 1S 7 Pin female supplied with the H3521 H 3521 Amphenol MS3102R10SL 3P 3 Pin male Cable Amphenol MS3106A10SL 3S 3 Pin female connector available order separately The WATERLOG H 3521 is warranted against defects in materials and workmanship for one year from date of shipment Notes Specifications subject to change without prior notice due to ongoing commitment to product testing and improvement Specifications A 1 Appendix B Modbus Protocol B 1 Modbus Interface Modbus is an industry standard field bus for interconnecting Programmable Logic Controllers PLCs intelligent sensors and other devices The H 3531 FlashLite is a Modbus slave and has a serial RS 485 port for connecting to a Modbus compatible host device See Chapter 2 for the proper connections Continuous 12 Volt power must be supplied to the H 3531 FlashLite B 2 Modbus RTU Transmission The H 3531 FlashLite supports RTU Remote Terminal Unit transmission mode The host must support RTU mode to communicate with the H 3531 FlashLite The RTU framing format for each byte is fixed at 11 bits and is as follows 1 start bit 8 data bits 1 parity bit and 1 stop bit The H 3531 FlashLite defaults to even parity but the user can change to no parity parit
33. his chapter focuses on the Simple Menu interface The menu displays a list of available options The right column is status information and cannot be edited At the bottom of the screen is an Enter Option gt prompt Enter the desired menu option here the ENTER key does not have to be pressed Some options when selected act as a toggle and will change when selected These options only have two choices such as On Off Options with brackets 7 allow the user to set or change a value After entering the requested value within the brackets press ENTER to make the change If you do not want to edit the option that has been selected press the ESC key and the edit will be aborted H 3521 Fluid HyperT erminal A x File Edit View Call Transfer Help Os 813 cl H 3521 Fluid Interface Menu P Sensor Mode Options Serial 000000 Y Sensor Output Options Version 1 30 A 3DI 12 Address O Temp 0 0 Battery 13 8 Stage 0 00 Digits 2 Offset 0 0000 Slope 2 30670 PSI to Feet Averaged Measurements 8 4 sec Measure Exit Enter Option gt _ Connected 0 00 10 V7100 9600 8 N 1 SCROLL CAPS NUM Capture Print echo 4 2 Simple RS 232 Menu Interface WATERLOG H 3521 RIES 4 3 Menu Options 4 3 1 P Sensor Mode Options In this sub menu you can view the current H 3521 power mode settings or other modes if available and change the modes if desired Refer to section 4 4 for the Sensor Mode Opt
34. ht line referenced to end points Pressure Hysteresis Less than 0 02 of FSO Long term Stability Accuracy drift is less than 0 05 of FSO per year Standard Pressure Ranges Pressure Depth Accuracy 0 to 15 PSI 0 to 34 6 ft 0 01 ft 0 to 30 PSI 0 to 69 20 ft 0 02 ft Custom calibration ranges available from 15 100 PSI Pressure Overload Less than 2 times the rated pressure SDI 12 Interface Baud Rate 1200 Protocol SDI 12 V1 3 7 bit even parity 1 stop bit Output Voltage Levels Minimum high level 3 5 volts Maximum low level 0 8 volts Response Time SDI 12 3 second measurement sequence programmable RS 485 Interface Protocol Modbus RTU Port RS 485 Baud Rate Programmable default 9600 RS232 Interface Protocol RS232 8bit No Parity 1 stop bit Baud Rate 9600 4 20mA Output Type 4 20mA optically isolated Loop Voltage 8 0V min 35V max Resolution 4uA 12 bit DAC Power Requirements Voltage Input WATERLOG H 3521 SERIES 10 to 16 0 Volts DC Appendix A Specifications Supply Current Sleep Mode 5004A typ Active measuring 15mA typ Bias Mode 1 5maA typ Surge Protection Built in 1 5 KVA Environmental Operating Temperature Compensated Range Storage Temperature 40 C to 60 C 30 C to 60 C 40 C to 80 C Media Compatibility Liquids and gases compatible with RTV stainless steel and brass Mechanical Material Fiberglass Size 4 76 x 4 76 x 2 5 hig
35. in non volatile EEPROM within the sensor Once the new value is written to the EEPROM a copy is sent to the sensor data buffer for verification This data can be viewed by using a subsequent aDO command To verify these settings any other time use the XRIH or XRIL commands The H 3521 comes from the factory with the 4 20mA_Hi 34 6 feet and 4 20mA_Lo 0 0 feet 0 15 psi sensor range Command Response Description aXRIH a0011 lt cr gt lt l1f gt Read 4 20mA_Hi aXRIL a0011 lt cr gt lt 1f gt Read 4 20mA_Lo aXWIHddd a0061 lt cr gt lt l1f gt Write 4 20mA_Hi aXWILddd 2a0061 lt cr gt lt l1f gt Write 4 20mA_Lo Where a is the sensor address 0 9 A Z a z 9 XRIH are upper case characters XRIL are upper case characters XWIH are upper case characters XWIL are upper case characters ddd is the new value This command takes 001 seconds to complete and places 1 value in the data buffer Use the aDO command to collect and view the slope or offset Example of a H 3521 Extended Read 4 20mA_ Hi command Command Response Time Values Description aXRIH a0011 lt cr gt lt lf gt lsec 1 Read 4 20mA_Hi Command Response Description aDO a 34 60 lt cr gt lt lf gt 4 20mA_Hi is 34 60 Example of a H 3521 Extended Write 4 20mA_Hi command Command Response Time Values Description aXWIH34 6 a0061 lt cr gt lt 1f gt 6sec 1 Write 4
36. installation it is convenient to quickly set the H 3521 s Stage reading to match the current stage elevation or pressure of the water as determined by a staff gauge or other datum This command causes the H 3521 to make a fresh measurement and automatically update the Offset b term as needed to produce the desired Stage Command Response Description axXSCSddd a0061 lt cr gt lt lf gt Set current Stage Where a is the sensor address 0 9 A Z a z 2 XSCS are upper case characters ddd is the new current stage value Example of a H 3521 Extended Set Current Stage command Command Response Time Values Description poe a0041 lt cr gt lt lf gt 4sec 1 Set the Stage to 2 3 Subsequent Command Response Description apo a 1 80 lt cr gt lt 1f gt The new Offset e 5 10 SDI 12 Command and Response Protocol WATERLOG H 3521 5 10 Extended Read Write Offset and Read Write Slope The H 3521 processes the pressure sensor input and computes Pressure in PSI units Stage is computed with a Stage m Pressure b equation The Slope m and Offset b terms are programmable allowing the user to scale the reading into other engineering units These commands allow the user to read or write change the Slope and Offset terms The slope is set to 2 3067 and the offset to 0 00 at the factory With the factory default 2 3067 the Stage will be in units of water depth in feet The new values are stored in non volatile EEPR
37. ions sub menu options 4 3 2 V Sensor Output Options In this sub menu you can view the current H 3521 output options and enables In this sub menu you can change these options and enables Refer to section 4 5 for the Sensor Output Options menu options 4 3 3 A SDI 12 Address This option is for editing the SDI 12 sensor address of the H 3521 The following prompt appears the bottom of the menu Enter Option gt Enter New SDI 12 Address Enter the desired SDI 12 sensor address 0 9 a z A Z the menu will refresh with the new address 4 3 4 S Stage This option is for displaying the last measured stage value and also for setting the current stage The following prompt at the bottom of the menu Enter Option gt Enter Stage Valuel Enter the stage setting you desire and press the ENTER key The message Calculating New Offset will then be displayed The H 3521 makes a new measurement and then calculates the offset needed to obtain the desired stage setting When the measurement is complete the offset value will have changed You must make a new measurement M to see the results of the new offset 4 3 5 D Digits This option is for displaying the current stage digits to the right of the decimal and also for editing the number of digits to the right of the decimal After pressing the D key the user will see the following prompt at the bottom of the menu Enter Option gt Stage Digits 4 3 6 O
38. mes out and the H 3521 returns to sleep 2 6 3 4 20mA Output Current loop sensors output a current rather than a voltage The 4 20mA output will drive standard industrial telemetry and process control instrumentation Since the signal to noise margin of 4 20mA is not large take care to protect the wiring from noise and interference The loop power supply must be sufficient to maintain 8 5 to 35V across the H 3521 s output terminals in addition to whatever voltage is needed to maintain 20mA across the loop receiver and interconnect wiring The 12 0V SDI 12 power source will work only if the resistance of your loop receiver and wiring is less than 150 ohms 8 5V 1500hms 20mA 11 5V The 4 20mA output is reverse diode protected The H 3521 is not loop powered continuous 12V instrument power must be supplied o Make certain there is 8 5 to 35V across the 4 20mA output terminals o Make certain the H 3521 is receiving 12V power e Use shielded 4 20mA cables in noisy environments 2 6 4 Modbus Interface Modbus is an industry standard serial digital interface for interconnecting Programmable Logic Controllers PLCs intelligent sensors and other devices The H 3521 is a Modbus slave and has a serial RS 485 port for connecting to a Modbus compatible host device See Appendix B for the Modbus register definitions Continuous 12 Volt power must be supplied to the H 3521 To activate the Modbus interface issue an extended SDI 12 command o
39. nd al3 DAA H3521vvvS nnnnnnVkkk lt cr gt lt 1f gt H 3521 implementation of the optional 13 character field S nnnnnnVvkkk 12 bytes total Where nnnnnn is a six character sensor serial number kkk is a three digit sensor firmware revision level e 5 8 SDI 12 Command and Response Protocol WATERLOG H 3521 5 8 Change Sensor Address Command The Change Sensor Address Command allows the sensor address to be changed The address is stored in non volatile EEPROM within the sensor The H 3521 will not respond if the command was invalid the address was out of range or the EEPROM programming operation failed Command Response Description aAn n lt cr gt lt lf gt Change sensor address Where a is the current old sensor address 0 9 A Z a z An ASCII may be used as a wild card address if the current address is unknown and only one sensor is connected to the bus A is an upper case ASCII character n is the new sensor address to be programmed 0 9 A Z NOTE To verify the new address use the Identify Command Example of a Change Sensor Address command Command Response Description aA2 DEE GLES Change sensor address to 2 War ERL G H 3521 SDI 12 Command and Response Protocol 5 9 5 9 Extended Set Current Stage Command The H 3521 processes the pressure sensor input and computes Pressure in PSI units Stage is computed with a Stage m Pressure b equation During
40. nd Acknowledge Command The Send Acknowledge Command returns a simple status response which includes the address of the sensor Any measurement data in the sensor s buffer is not disturbed Command Response a a lt cr gt lt lf gt Where a Is the sensor address 0 9 A Z a z Example of H 3521 a command Command Response Time Values Description tar a lt cr gt lt lf gt 0 sec 0 Return the address of sensor e 5 6 SDI 12 Command and Response Protocol WATERLOG H 3521 5 6 Initiate Verify Command The Verify Command causes a verify sequence to be performed The result of this command is similar to the aM command except that the values generated are fixed test data and the results of diagnostic checksum tests The data generated in response to this command is placed in the sensor s buffer for subsequent collection using D commands The data will be retained in the sensor until another M C or V command is executed Command Response Description av atttn lt cr gt lt l1f gt Initiate verify sequence Where a is the sensor address 0 9 A Z a z V is an upper case ASCII character ttt is a three digit integer 000 999 specifying the maximum time in seconds the sensor will take to complete the command and have data available in its buffer n is a single digit integer 0 9 specifying the number of values that will be placed in the data buffer If n is zero 0 no data
41. o water and the pressure offset will drift Figure 5 Pressure amp Vent Ports WATERLOG H 3521 Installation 2 3 2 6 Connecting Your Data Logger The H 3521 has RS 232 SDI 12 and Modbus smart digital interfaces together with a 4 20mA analog output The H 3521 is a SDI 12 V1 3 compliant sensor excluding the CRC commands It connects directly to any data recorder with SDI 12 capability The instrument housing has both a 7 pin main interface connector and a 3 pin RS 232 communication connector Figure 6 Connector amp Terminal Strip 7 pin Circular Connector 3 pin Circular Connector Color Function Pin Color Function Orange RS485 Modbus 1 N A RS232 TxD Brown RS485 Modbus 2 N A RS232 RxD Blue 4 20mA 3 N A GND Green 4 20mA Black GND Red 12V Power Yellow SDI 12 Data 2 4 Installation WATERLOG H 3521 SERIES 2 6 1 SDI 12 Interface The user must connect pins 5 6 and 7 to the data recorder or the user can power the H 3521 separate of the data recorder and connect just the SDI 12 data line pin 7 2 6 2 RS 232 Output When the user wakes up the H 3521 with this port the H 3521 makes a new measurement and updates the outputs 1f enabled and then prints out the measured stage and temperature value If the user sends a carriage return CR following the wake up then the H 3521 simple menu interface is initiated and the H 3521 waits for a command After 3 minutes of inactivity the menu mode ti
42. omplete and places 1 value in the data buffer Use the aDO command to collect and view the current value Example of a H 3521 Extended Read Power_Mode command Command Response Time Values Description aXRPM a0011 lt cr gt lt 1f gt Isec 1 Read Power_Mode Command Response Description aDO a 0 lt cr gt lt l1f gt Mode Sleep Example of a H 3521 Extended Write Power_Mode command Command Response Time Values Description aXWPM3 a0011 lt cr gt lt 1f gt 1 sec 1 Write Power_Mode Command Response Description apo a 3 lt cr gt lt lf gt Mode 3 Continuous mode e 5 14 SDI 12 Command and Response Protocol WATERLOG H 3521 5 14 Extended Read Measure Rate and Write Measure Rate When the H 3521 is put in power mode 3 it makes continuous measurements based on a measure rate This command is for reading writing that measure rate value The measure rate range is 0 255 minutes When the user sets the measure rate to O then the H 3521 makes continuous measurements as fast as the H 3521 will measure which is about 6 seconds by default The factory default is 1 minute measure rate Command Response Description aXRMR a0011 lt cr gt lt 1f gt Read Measure Rate aXWMRnnn a0021 lt cr gt lt 1f gt Write Measure Rate Where a is the sensor address 0 9 A Z a z XRMR are upper case characters XWMR are upper case characters nnn is the rate in minutes that the sensor
43. on for the access to and use of the PRODUCT extended to you by DESIGN ANALYSIS and to protect the confidential and proprietary information of DESIGN ANALYSIS USER agrees as follows a USER agrees that they will not remove from the exterior of the housing of the PRODUCT any safety warnings or notices of proprietary interest placed thereon by DESIGN ANALYSIS b USER agrees that they shall not disassemble or otherwise reverse engineer the PRODUCT c USER agrees to treat the PRODUCT with the same degree of care as USER exercises in relation to their own confidential and proprietary information 4 TERM USER may enjoy these rights only as long as their possession of the PRODUCT shall continue to be rightful These rights will cease if the PRODUCT is returned to DESIGN ANALYSIS under the terms of any redemption offer warranty or money back guarantee or if USER transfers the PRODUCT to another party on terms inconsistent with this agreement 5 LIMITED WARRANTY a What is Covered DESIGN ANALYSIS warrants that for a period of twelve months from the time of delivery the functions to be performed by the PRODUCT will be substantially in compliance with USER documentation DESIGN ANALYSIS also warrants that the PRODUCT will be free from defects in materials and workmanship for a period of ONE YEAR from the date of delivery b What USER Must Do Wa ATER LOG H 3521 User Agreement WATERLOG Warranty W 1 If the product fails to satis
44. r this test to work correctly the standpipe must be connected to the chassis ground of the data recorder The wire establishes a ground connection between the water and the data logger Water and other conductive objects isolated by a plastic bucket or table surface pick up AC noise from nearby lighting and power lines The AC noise is coupled by the water to the stainless diaphragm in the pressure sensor If a plastic or non conductive tube is used to connect to the pressure source to the H 3521 the sensor will be electrically isolated from the water media The AC noise may affect the pressure measurement due to large voltages between the water media and the sensor data logger ground This precaution is not necessary for field installations because surface water and ground water are not isolated from earth ground WaTERL G H 3521 Installation 2 9 Chapter 3 Maintenance 3 1 Maintenance Sustained operation of the H 3521 pressure sensor is almost maintenance free As with any precision instrument the calibration should be checked on a regular basis The instrument has no filters or user serviceable internal parts 3 2 Precautions e Check for leaks make certain the connections to the pressure port are tight e Make certain the atmospheric vent is not covered or blocked Make certain the gauge station enclosure is open to the atmosphere If the sensor is placed in a cabinet or sealed enclosure the cabinet must have a screened vent or oth
45. r use the RS 232 menu interface and set Power_Mode 4 See section 4 5 for details This setting causes the H 3521 to remain awake and monitor the RS 485 port for Modbus messages This setting can be made at the factory if requested WATERL G H 3521 Installation 2 5 2 7 Wiring and Installation Precautions e The H 3521 requires that the water be at ground potential Mother Nature takes care of this for surface and ground water e Make certain the pressure port connection is tight e Make certain the sintered bronze vent port is not painted or covered 2 8 Programming Your SDI 12 Data Recorder You must prepare your data recorder to receive and record the H 3521 data Since data recorders differ widely refer to your recorder manufacturer s directions In general program the data recorder to input four values via the SDI 12 port Usually only one or two of the parameters are actually recorded Your data recorder must issue an aM command then collect the data with a aDO command as explained in Chapter 4 The H 3521 places four parameters in its data buffer atAA AAA BB BBB CC C DD D lt cr gt lt lf gt Where a SDI 12 address 0 9 A Z AA AAA Stage feet inches meters etc BB BBB Pressure PSI CC C Temperature C DD D Input Supply Voltage Volts 2 9 Programming the SDI 12 Address If more than one sensor is to be connected to the SDI 12 bus make certain each sensor has a different sensor address The H 3521 com
46. re Command The Measure Command causes a new measurement sequence to be executed Data values generated in response to this command are stored in the sensor s buffer for subsequent collection using D commands The data will be retained in the sensor until another M C or V command is executed Command Response Description aM atttn lt cr gt lt lf gt Initiate measurement aM1 atttn lt cr gt lt lf gt Initiate measurement Where a is the sensor address 0 9 A Z a z M is an upper case ASCII character ttt is a three digit integer 000 999 specifying the maximum time in seconds the sensor will take to complete the command and have measurement data available in its buffer n is a single digit integer 0 9 specifying the number of values that will be placed in the data buffer If n is zero 0 no data will be available using subsequent D commands Upon completion of the measurement a service request a lt cr gt lt lf gt is sent to the data recorder indicating the sensor data is ready The data recorder may wake the sensor with a break and collect the data any time after the service request is received or the specified processing time has elapsed Example of a H 3521 aM command Command Response Time Values Description ami a0044 lt cr gt lt lf gt 4sec 4 Make measurement E Command Response aDO a AA AA BB BBBB CC C DD D lt cr gt lt lf gt
47. ress the ENTER key Refer to Chapter 5 for more details on the meancount value 4 3 9 M Measure Pressing the M key causes the H 3521 to make a new measurement and refresh the screen with the new measurement data The user will see the following message after pressing the M key Enter Option gt Measuring 4 3 10 X Exit Pressing the X key causes the H 3521 to exit the Simple Menu mode The user will see the following message after pressing the X key Enter Option gt H 3521 Fluid Off 4 4 Simple RS 232 Menu Interface WaTeRL G H 3521 SERIES 4 4 Sensor Mode Options Menu This setup menu is for viewing and editing the H 3521 power modes and other mode enables H 3521 Fluid HyperTerminal oj x File Edit View Call Transfer Help Ole als alal al Sensor Mode Options Menu P F N D Enter Option gt _ Power Mode 0 Fast Mode off NOAA Mode Off Reset to Defaults Connected 0 02 10 T100 9600 8 N 1 SCROLL CAPS NUM Capture Print echo Z 4 4 1 P Power Mode This option is for changing the H 3521 power mode The following prompt at the bottom of the menu Enter Option gt Power Mode Value 0 4 Enter in the desired power mode Power Modes 0 Sleep between measurements 1 Sleep with sensor bias On reserved for factory use 2 Sleep with sensor bias and reference On reserved for factory use 3 Wait mode Make measurements and update all outputs based on the measure rat
48. rotocol 5 11 5 11 Extended Read Write Stage Digits This is for reading or writing the stage digits to the right of the decimal point The stage digits by default is set to 2 Command Response Description aXRSD a0011 lt cr gt lt lf gt Read Stage Digits aXWSDd a0021 lt cr gt lt 1f gt Write Stage Digits Where a is the sensor address 0 9 A Z a z XRSD are upper case characters XWSD are upper case characters d is the new enable value 0 9 Example of a H 3531 Extended Read Stage Digits command Command Response Time Values Description aXRSD a0011 lt cr gt lt lf gt l sec 1 Read Stage Digits Command Response Description aDO a 2 lt cr gt lt l1f gt Stage digits 2 Example of a H 3531 Extended Write Stage Digits command Command Response Time Values Description oe a0021 lt cr gt lt lf gt 2sec 1 Set Stage digits to 3 Command Response Description apo y a 3 lt cr gt lt l1f gt Stage digits 3 e 5 12 SDI 12 Command and Response Protocol WATERLOG H 3521 5 12 Extended Read Write 4 20mA_Hi and Read Write 4 20mA_Lo The H 3521 scales the current Stage data to drive the 4 20mA output The 4 20mA_Hi and 4 20mA_Lo settings control how the Stage data is processed The 4 20mA_Lo should be set to the desired Stage corresponding to a 4 00mA output The 4 20mA_Hi should be set to the desired Stage corresponding to a 20 00mA output These settings are stored
49. t sequence takes approximately 3 seconds to complete before the requested data is sent The host must know this so that it does not timeout or send a retry These registers are 64 bit floating point double precision numbers Table 3 below shows the contents of the input register followed by a description of each register Table 3 Input Registers B 5 0 Stage RO This input register holds the current measured stage in the desired units As shown in the table you can also read the value as a 32 bit floating point number B 5 1 Pressure RO This input register holds the current measured pressure before any slope or offset is applied therefore it holds the raw psi value As shown in the table you can also read the value as a 32 bit floating point number B 5 2 Temperature RO This input register holds the current measured temperature This temperature reading is the temperature of the internal pressure sensor and may not accurately reflect air temperature As shown in the table you can also read the value as a 32 bit floating point number B 5 3 Battery Voltage RO This input register holds the current input voltage As shown in the table you can also read the value as a 32 bit floating point number WATERL G H 353 1 Modbus Protocol B 5
50. the sensor address 0 9 A Z a z C is an upper case ASCII character ttt is a three digit integer 000 999 specifying the maximum time in seconds the sensor will take to complete the command and have measurement data available in its buffer nn is a two digit integer 00 99 specifying the number of values that will be placed in the data buffer If n is zero 0 no data will be available using subsequent D commands The data recorder may wake the sensor with a break and collect the data anytime after the specified processing time has elapsed Example of a H 3521 aC command Command Response Time Values Description nac a00604 lt cr gt lt 1f gt 6sec 04 Make measurement Subsequent Command Response apo a AA AA BB BBBB CC C DD D lt cr gt lt 1lf gt Where AA AA Stage feet inches meters etc BB BBBB Pressure PSI CC C Temperature C DD D Power Supply Voltage Volts e 5 4 SDI 12 Command and Response Protocol WATERLOG H 3521 5 3 Send Data Command The Send Data command returns sensor data generated as the result of previous aM aC or aV commands Values returned will be sent in 33 characters or less The sensor s data buffer will not be altered by this command Command Response aDO through aD9 Napd d sai padwid lt ers lt 1f gt Where a is the sensor address 0 9 A Z a z 2 DO D9 are upper case ASCII characters
51. to the current water elevation or stage as determined with a staff gauge or other datum H 3521 Fluid HyperTerminal Al ES File Edit View Call Transfer Help Da 518 ala es H 3521 Fluid Interface Menu P Sensor Mode Options 000000 y Sensor Output Options 1 30 A 3DI 12 Address 0 Stage DO Digits Offset 0000 Slope 30670 PSI to Feet Averaged Measurements 8 4 sec Measure Exit Enter Option gt _ Z One of the ways to do this is by using the RS232 simple menu interface via Hyperterminal or other similar terminal program See chapter 4 section Connecting to the H 3521 Once you have established connection your screen will look similar to the screen image below When the user sets the stage the H 3521 makes a fresh measurement and automatically updates the Offset as needed to produce the desired Stage To set the stage using the RS 232 menu press S for S Stage and enter in the current stage value and then press enter Then press the M key for M Measure and verify that the set stage command did execute You should see that the offset value has changed The other way to set the stage is to send the extended SDI 12 Set Current Stage command The aXSCSdd d command is discussed in more detail in section chapter 5 Connected 3 32 16 T100 9600 8 N 1 SCROLL CAPS NUM Capture Print echo WATERLOG H 3521 Installation 2 7 Example of a H 3521 Fluid Extended
52. ty RW A sch Gt are tN EI Ae cl Meee REL e RU Aaah NEE ts B 3 B 4 6 User Stage Offset R W sian S54 ki Stagees Goals a bans B 3 B47 User Stage SlOpe RIW e ce oye ng eel ot B 3 BA Set C rrent Saa WO otis dd ad wal ea Rew we wee a olas B 4 BS Input Registers c 206 i464 e0 eu eee A AA he eos AAA B 5 BSO SSA RO 5 ted ceed A A hind Meee B 5 B l Pressure RO 6 55 ese cabs eas Le eae nd B 5 B5 2 LemperavunetRO iia yA db Re aire beaded Dede wade poe B 5 B5 3 Battery Voltage ROJ coa a Sees et a is a te ol Peete B 5 WAT ERLOG H 3521 Table of Contents T 3 Chapter 1 Introduction 1 0 Introduction The WATERLOG H 3521 is a digital pressure transducer specifically designed for water level monitoring The H 3521 directly measures water or other fluid pressure over a broad temperature range Typical applications include monitoring snow pillows to measure snow pack measurement of water in accumulating rain gauges and fluid pressure in weirs and dams The H 3521 can be used in a gas purge bubbler installation however Design Analysis Associates Inc manufactures other instruments specifically for that application The H 3521 has RS 232 SDI 12 and Modbus smart digital interfaces together with a 4 20mA analog output The sensor makes multiple pressure measurements averages the results and converts the measurement data into units of PSI Feet Meters or other engineering units The H 3521 is easy to use and works with any SDI 12 data r
53. will update all outputs Example of a H 3521 Extended Read Measure Rate command Command Response Time Values Description aXRMR a0011 lt cr gt lt 1f gt l sec 1 Read Measure Rate Command Response Description aDO a l lt cr gt lt lf gt Measure Rate 1 minute Example of a H 3521 Extended Write Measure Rate command Command Response Time Values Description aXWMR2 a0021 lt cr gt lt 1f gt 2 sec 1 Write Measure Rate Command Response Description apo a 2 lt cr gt lt lf gt Measure Rate 2 minutes War ERLOG H 3521 SDI 12 Command and Response Protocol 5 15 5 15 Extended Read Mean_Count and Write Mean_Count The H 3521 makes multiple raw sensor measurements discards the high and low values integrates averages the measurement data and computes Pressure PSI The number of raw sensor measurements made for each SDI 12 measurement sequence is programmable When measuring turbulent water tides or other special applications Mean_Count can be changed to increase or decrease the number of pressure measurements made during the SDI 12 measurement sequence The H 3521 makes 7 5 pressure measurements per second 133ms measurement The ttt field in the SDI 12 sensor response is computed by the H 3521 and indicates how much time the H 3521 will require to complete the measurement sequence The ttt field will automatically change if Mean_Count is changed The H 3521 comes from the factory with Mean_Count set to
54. ws what values to write to select the desired baud rate Modbus Baud rate Select Register 00 9600 factory default 01 4800 02 2400 03 1200 B 4 5 Parity R W This holding register allows the user to change the parity bit The list below shows what values to write to select the desired parity Modbus Parity Select Register 00 No Parity 01 Even Parity factory default B 4 6 User Stage Offset R W This holding register allows the user to enter a user defined stage offset The factory default is O This holding register is a 64 bit holding register therefore the value sent to write to this register must be in a 64 bit floating point number format As shown in the table there is also a 32 bit floating point number register for this value B 4 7 User Stage Slope R W This holding register allows the user to enter a user defined stage slope Writing to this register is only applicable when the Stage Units Select Register is set to 06 which indicates the user defined mode for the units This holding register is a 64 bit holding register therefore the value sent to write to this register must be in a 64 bit floating point number format The factory default slope is 2 3067 which sets stage units to feet As shown in the table there is also a 32 bit floating point number register for this value WaTERL G H 353 1 Modbus Protocol B 3 B 4 8 Set Current Stage WO This holding register allows the user to set the current st
55. y fixed 1 In RTU transmission mode all request and response bytes are sent as two 4 bit hexadecimal characters RTU transmission mode also defines certain message frame timing constraints this will not be discussed in this document but the user can find the RTU mode transmission specifications online at www modbus org B 3 Modbus Function codes The H 3531 FlashLite supports three Modbus function codes as shown in the table below Table 1 Supported Function Codes Function Code of Registers to R W Read Holding Registers 28 Read Input Registers 8 Write Single Holding Register 11 WATERLOG H 353 1 Modbus Protocol B 1 B 4 Holding Registers There are 25 holding registers in the H 3531 FlashLite some are Read Write registers and some are Read Only registers The user configurable settings are found in the Holding Registers Table 2 below shows the contents on the Holding Registers followed by a description of each register Table 2 Holding Registers i 2 Set Current Stage 39 0027 IEEE F P B 4 0 ID String RO The first registers in the Holding Registers are the ID string registers this 1s the same ID string that the SDI 12 ID command returns Refer to SDI 12 ID command to see details of the response The ID string consists of 17 16 bit registers These registers can be read separately but to get the full ID string the user must read all 17 registers at once These registers are RO read only r
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