In-situ Aqua TROLL 500 Operator's Manual
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In-situ Aqua TROLL 500 Operator's Manual

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Aqua TROLL 500
Operator's Manual
2023-08-04 | 0050702

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  • Page 1 Aqua TROLL 500 Operator's Manual 2023-08-04 | 0050702...
  • Page 2 Information subject to change without notice. In-Situ, In-Situ logo, “Water Simplified”, VuLink, RDO, RuggedCable, TROLL, BaroTROLL, HydroVu, VuSitu, Baro Merge, and Win-Situ are trademarks or registered trademarks of In-Situ Inc. ©2023. All rights reserved. This product may be covered by patents identified at www.in-situ.com/patents For a list of local compliance representatives, see https://in-situ.com/us/faq/regulatory-compliance/...

  • Page 3: Table Of Contents

    Contents Introduction ���������������������������������������������������������������������������������������������������������������������������������������������������� 7 Serial Number Location ................................7 Instrument Description ................................7 Document Conventions ................................7 Unpacking and Inspecting ................................. 7 Safety �������������������������������������������������������������������������������������������������������������������������������������������������������������� 8 Intended Use ....................................8 Instrument Specifications ������������������������������������������������������������������������������������������������������������������������������ 9 External Power Source Requirements ............................ 9 Instrument Dimensions ................................10 Instrument Components ������������������������������������������������������������������������������������������������������������������������������...
  • Page 4 Wireless TROLL Com ..................................23 Rugged Cable ....................................23 Aqua TROLL 500 ...................................23 Getting Started (Spot-Checking) ���������������������������������������������������������������������������������������������������������������� 24 Parameters and Sensors ������������������������������������������������������������������������������������������������������������������������������ 29 Using the RDO Sensor and Sensor Cap ..........................29 Handling pH and Ion-Selective Electrode Sensors ......................29 Using Ion-Selective Electrode Sensors ..........................30 Ammonium Sensor Requirements ............................30...
  • Page 5 Navigating the Win-Situ Interface ��������������������������������������������������������������������������������������������������������������� 52 Home Tab ......................................52 Sensor Tab .......................................52 Device Setup Tab ..................................53 Connecting the Aqua TROLL 500 to a PLC or Data Logger ������������������������������������������������������������������������ 54 Flying Leads Wire Diagram ...............................54 Configuring SDI-12 Settings ������������������������������������������������������������������������������������������������������������������������ 58 About SDI-12 ....................................58 Configure SDI-12 Settings in VuSitu ............................58...
  • Page 6 Service and Repair ���������������������������������������������������������������������������������������������������������������������������������������� 67 Obtaining Repair Service ................................67 Guidelines for Cleaning Returned Equipment ........................68 More Information ����������������������������������������������������������������������������������������������������������������������������������������� 69 Appendix ������������������������������������������������������������������������������������������������������������������������������������������������������ 72 Appendix A: Parameter Numbers and Locations ......................72 Appendix B: Unit IDs ...................................75 1-800-833-7958 www.geotechenv.com...

  • Page 7: Introduction

    Your equipment was carefully inspected before shipping. Check the equipment for any physical damage sustained during shipment. Notify In-Situ and file a claim with the carrier if there is any such damage; do not attempt to deploy or operate the instrument.

  • Page 8: Safety

    500. If you have questions, contact In-Situ Technical Support for assistance. • Do not use the Aqua TROLL 500 in any manner not specified by the manufacturer. • Do not submerge the Wireless TROLL Com or your mobile device in liquid.

  • Page 9: Instrument Specifications

    2 year - sonde, sensors (excluding ISE sensors) Warranty 1 year - Nitrate, Chloride, and Ammonium Sensors Other - see warranty policy at www.in-situ.com External Power Source Requirements Current from an external power source must not exceed 4 amps. 1-800-833-7958...

  • Page 10: Instrument Dimensions

    Instrument Dimensions 18.125” 2.04” 16.35” 1.85” 1-800-833-7958 www.geotechenv.com...

  • Page 11: Instrument Components

    Instrument Components Exploded View 1 1. Bumper 2. Instrument 3. Wiper motor 4. Sensors (4) 5. Restrictor Exploded View 2 6. End Cap 7. Bumper 8. Bulkhead connector End View Sensor Port Detail Flat edge of connector aligns Sensor with flat edge of Wiper motor ports Rugged Cable.

  • Page 12: Sensor Specifications

    Sensor Specifications Sensor Summary Operational Recommended Calibration Pressure Usable Depth Sensors Expected Lifetime* Temperature Frequency Rating - PSI m | ft Range pH/ORP 2 years or greater** 10 to 12 weeks** - 5 to 50° C 2 years or greater 12 months** - 5 to 50°...

  • Page 13: Solutions

    Solutions Solution Shelf Life - Unopened Shelf Life - Opened 4 months. Store in a cool, dark place. Shake 7 to 21 days (±10 mV, ±0.05 pH, Quick Cal before use. ±50 μS/cm) ZoBell’s 9 months. Store in a cool, dark place. 3 to 6 months Low Conductivity (147 Hours (±1 μS/cm, check before...

  • Page 14: Potential Interferents

    Potential Interferents Conductivity Sodium salts (at pH >12) Temperature Dissolved Oxygen Temperature, atmospheric pressure, salinity, Ions that are stronger reducing agents than chlorinity hydrogen or platinum, e.g., chromium, vanadium, titanium, etc. Ammonium Chloride Cesium, Potassium, Thallium, pH, Silver, Lithium, Sodium Hydroxide, Ammonia, Thiosulfate, Bromide, Sulfide, Iodide, Cyanide Nitrate...

  • Page 15: Ammonium, Chloride, And Nitrate Interferent Concentrations

    Ammonium, Chloride, and Nitrate Interferent Concentrations Ammonium The table below lists concentrations of possible interfering ions that cause 10% error at various levels (in ppm) of NH 100 ppm NH 10 ppm NH 1 ppm NH Celsium (Cs Potassium (K Thallium (TI 3100 pH (H...

  • Page 16: Fluorometer Wavelengths

    455 nm to 530 nm Crude OIl 365 nm 430 nm to 505 nm Additional Information For additional sensor details including accuracy, range, resolution, methodology, detection limits, response time, and more, view the Aqua TROLL specification sheet at www.in-situ.com. 1-800-833-7958 www.geotechenv.com...

  • Page 17: Required Accessories

    Required Accessories Communication Device You will need a communication device to calibrate, configure and deploy the Aqua TROLL 500. Wireless TROLL Com Provides power to the Aqua TROLL 500. Calibrate, configure and deploy with a Bluetooth-endabled Android or iOS device.

  • Page 18: Cable

    Cable Rugged Twist-Lock Cable Connects the Aqua TROLL 500 to a Wireless TROLL Com or VuLink. Vented or non-vented. Stripped and tinned available for connecting to 3rd- party equipment. Sensors Available Sensors 1. Temperature 2. Conductivity/temperature 3. pH/ORP 4. RDO 5.

  • Page 19: System Components

    System Components Sensors RDO Sensor - includes RDO-X Cap 0063450 RDO Sensor - includes RDO Fast Cap 0038520 Combination pH/ORP Sensor 0063470 Turbidity Sensor 0063480 Combination Conductivity/Temperature Sensor or 0063460, 0063490 standalone Temperature Sensor Ammonium Sensor 0033700 Nitrate Sensor 0033710 Chloride Sensor 0033720 Chlorophyll A Sensor...
  • Page 20 Cable Stripped-and-tinned Cable with male connector 0053310 Twist-lock Bulkhead Connector 0053240 Twist-lock Backshell/Hanger, Titanium 0051480 Cable Extender 0051490 Large Desiccant (titanium connector) 0051810 Large Desiccant (ABS connector) 0053550 Small Desiccant (3 pack) - storage desiccant 0052230 Desiccant Refill Kit for Large or Outboard Desiccant 0029140 Calibration and Maintenance RDO Classic Cap Replacement Kit...
  • Page 21 Low-Flow Complete Low-Flow Kit (includes flow cell with 0079790 fittings and stake, base plate, documentation) Flow Cell Kit 0078990 Flow Cell Base Plate 0079810 Fittings Kit 0032130 Pelican Case with Foam Insert 0066860 1-800-833-7958 www.geotechenv.com...
  • Page 22 RuggedCable System RuggedCable Systems are custom-built, durable, direct-read cables that include the following items: • Titanium twist-lock connectors for quick, reliable connections to the instrument, desiccant, and communication cable • Metal shield beneath the cable jacket to prevent electrical interferences •...

  • Page 23: Spot Checking Configuration

    Spot Checking Configuration Take live readings with an Aqua TROLL 500, Rugged Cable, Wireless TROLL Com and a Bluetooth-enabled Android device. Wireless TROLL Com Powers the Aqua TROLL 500 during live readings. Communicates with the VuSitu mobile app via Bluetooth.

  • Page 24: Getting Started (Spot-Checking)

    Getting Started (Spot-Checking) Follow the steps below to set up and deploy the Aqua TROLL 500 when you intend to take live readings. See the next page for information about setting up and using the instrument in remote-monitoring applications. Unpack instrument.
  • Page 25 Install Wiper Motor and Sensors Apply a pea-sized drop of Remove restrictor. Install wiper motor or port plug lubricant to O-rings. into center port. Apply a pea-sized drop of Align sensor with interlock groove Tighten set-screw at base of each lubricant to O-rings.
  • Page 26 Connect the cable to the instrument. Remove protective caps Ensure O-ring on Flat edge inside cable Hold textured sleeve of from instrument and instrument connector end must align with cable in one hand and cable. is clean. Apply vacuum flat edge on instrument instrument in other.
  • Page 27 Connect. devices. An iOS device To connect to another automatically connects instrument, press Disconnect and then to the closest In-Situ Choose or Add Device. instrument. VuSitu displays a list of available connections. VuSitu displays the Tap the serial number Connected Instrument...
  • Page 28 Connecting the TROLL Com You must connect the Aqua TROLL 500 to a Wireless TROLL Com to calibrate the instrument, configure or take live readings. Click Click Attach Rugged Cable to the Attach opposite end of cable to Press power button.

  • Page 29: Parameters And Sensors

    Parameters and Sensors Using the RDO Sensor and Sensor Cap The wiper can severely reduce the life of the RDO Fast Cap. Wear will vary by application. Verify sensor performance prior to use and replace the Fast Cap if damaged. Inspect foil prior to each use.

  • Page 30: Using Ion-Selective Electrode Sensors

    Using Ion-Selective Electrode Sensors ISE sensors require one or more additional sensors to function. See the details below and install the required sensors to use an ISE. Ammonium Sensor Requirements Conductivity/ Temperature Sensor Temperature Sensor To calculate ammonia��� Conductivity/ pH Sensor Temperature Sensor Chloride, Nitrate, and pH/ORP Sensor Requirements Conductivity/...

  • Page 31: Derived Parameters

    Derived Parameters VuSitu can derive estimates for additional parameters based on correlations with measured parameters. Scale factors for derived parameters are unique for each deployment site, so they must be determined by laboratory analysis of grab samples. Examples of derived parameters include: •...

  • Page 32: Lcd Screen

    LCD screen will display sensor Hold instrument horizontally and Tilt instrument left or right to status on activation. slowly tap Aqua TROLL 500 logo scroll through menu options. 3-4 times to view the main menu. LCD Status Indicators 1. Port Status 2.
  • Page 33 Full-Text Messages The LCD will display text messages instead of status icons when certain conditions are met. Multiple messages will rotate and display for 3 seconds each. Text Message Cause and Remedy Battery cover is not fully closed. Close battery cover Ensure the battery cover is securely tightened.

  • Page 34: Calibrating Sensors

    Select Set User Defined to begin calibrating with the new value. If you are using an In-Situ standard and the app does not automatically detect it, perform the sensor cleaning and maintenance procedure, then select Retry Auto Detect.

  • Page 35: Rdo 100% Saturation Calibration: Water Saturated Air

    RDO 100% Saturation Calibration: Water Saturated Air Use the procedure below to calibrate the Aqua TROLL 500 RDO sensor, or see the next section for an alternative method. Sponge Place the restrictor in calibration Saturate a small sponge with Place the sponge on the restrictor mode (holes near center of water.

  • Page 36: Rdo Salinity Setting

    RDO Salinity Setting The Aqua TROLL 500 includes automatic salinity compensation. This feature requires a conductivity sensor and RDO sensor. With both sensors installed, the sonde will use salinity compensation by default. To change the compensation value, follow these steps:...

  • Page 37: Reported Depth

    Reported Depth If a pressure sensor is included, the Aqua TROLL 500 uses its pressure reading and specific gravity value to calculate depth. The pressure sensor is located at the center of the instrument, but depth is reported at the smart sensor faces.

  • Page 38: Calibration Frequency Recommendations

    Calibration Frequency Recommendations In-Situ sensors are factory calibrated across the entire range of each sensor, and thus achieve a very high degree of accuracy and stability for extended periods of time without user calibration. In-Situ recommends inserting the instrument into a known calibration standard to check the accuracy of a sensor prior to performing any user calibration if you suspect drift, unless a user calibration is required by a standard operating procedure.
  • Page 39 Only when required by Chlorophyll a 12 months user protocol Only when required by BGA-PC 12 months user protocol Only when required by BGA-PE 12 months user protocol Only when required by Rhodamine WT 12 months user protocol Only when required by Fluorescein WT 12 months user protocol...

  • Page 40: Batch Calibrating Sensors In Vusitu

    Batch Calibrating Sensors in VuSitu Different Sensor Types (Quick Cal Solution) Use Quick Cal standard to calibrate conductivity, pH, and ORP with a single solution. Quick Cal solution can also be used for 100% RDO Saturation calibration. To calibrate multiple sensors of the same type, follow the instructions on the next page.

  • Page 41: Multiple Sensors Of The Same Type

    Multiple Sensors of the Same Type For some parameters (pH, ORP, RDO, turbidity, and conductivity), you can calibrate multiple sensors of the same type together. Use this feature when you need to batch calibrate a group of sensors prior to field deployment. In VuSitu, click Calibrations from Install the sensors to calibrate.

  • Page 42: Navigating Vusitu

    Com. Then open VuSitu to connect. • If the Aqua TROLL 500 is connected to another power source, turn on the Aqua TROLL 500 LCD screen by holding the sonde vertical with the sensor end facing up. Then open VuSitu to connect.

  • Page 43: Vusitu Menu Options

    VuSitu Menu Options The features available in the VuSitu mobile app vary slightly depending on the instrument to which it is connected. Tap the menu icon in the Some features aren’t upper left portion of the available when VuSitu screen to view options. isn’t connected to an Tap the icon again to instrument.

  • Page 44: Live Readings In Vusitu

    Live Readings in VuSitu The live readings screen displays measurements taken from the instrument every two seconds. You can save these readings and share them via email or cloud storage. Snapshot Mode Tap Change Location Tap Save Single Reading Tap the button on the Choose the desired location and press Save bottom left to toggle...

  • Page 45: Vusitu Data

    VuSitu Data You can transfer a data file from your mobile device to a PC via Bluetooth, email it to yourself or any valid email address, or upload it to Google Drive. Sharing Data Select Data Files from Select Export. Tap and hold the name Choose email, cloud the menu at the top left...

  • Page 46: Vusitu Locations

    VuSitu Locations About VuSitu Locations A VuSitu location represents the physical spot where an instrument collects data. You can create a VuSitu location for any monitoring site. If you don’t create a location, your data defaults to “Device Location. ” Location names appear on the live readings screen, in snapshot files, and in log files.

  • Page 47: How To Select A Location

    How to Select a Location Data is associated with the Location that is displayed on the Live readings screen. After you have created a Location, you must select it in order for your data to be associated with the Location. Fort Collins, CO Select Locations from Tap a location to select it.

  • Page 48: Remote-Monitoring Configuration (Telemetry)

    Remote-Monitoring Configuration (Telemetry) VuLink provides power to the Aqua TROLL 500 and uploads data to the HydroVu Data server. 1 Remove the battery pull-tab. Never mix old and new batteries, or Lithium and alkaline batteries. Make sure all three batteries are installed in the same orientation.
  • Page 49 3 Press the button on the VuLink control panel. Connecting to a cellular network can take up to 10 minutes in the following situations: The first time VuLink powers up When VuLink hasn’t been powered up in several weeks or months Pressing the button All LEDs turn green for Next, the connection...

  • Page 50: Hydrovu

    HydroVu HydroVu is a data-management application that runs in the browser. Use it to manage data, view graphs, and configure telemetry devices for remote monitoring. See it at www.hydrovu.com. 1-800-833-7958 www.geotechenv.com...

  • Page 51: Connecting To Win-Situ On A Pc

    Connecting to Win-Situ on a PC Connecting to Win-Situ via USB Download and install Win-Situ by visiting www.in-situ.com. The Wireless TROLL Com must be connected to the sonde and powered on to connect the instrument to Win-Situ. You can connect a Wireless TROLL Com to a PC with the included USB cable. Plug the cable into the port at the top of the TROLL Com and the USB port on your PC.

  • Page 52: Navigating The Win-Situ Interface

    Navigating the Win-Situ Interface Home Tab View data files Display Sites list Meter view List view Graph view Record Record snapshot current values Sensor Tab Set up sensor (double-click) Calibrate sensor Set up sensor 1-800-833-7958 www.geotechenv.com...

  • Page 53: Device Setup Tab

    Device Setup Tab 1-800-833-7958 www.geotechenv.com...

  • Page 54: Connecting The Aqua Troll 500 To A Plc Or Data Logger

    Connecting the Aqua TROLL 500 to a PLC or Data Logger Flying Leads Wire Diagram Refer to the diagrams on the following pages for PLC wiring diagrams. Unused leads should not be touching. RS485 (+) RS485 (-) Ground SDI-12 Power...
  • Page 55 SDI-12 3 Wire Max Cable Length = 200 ft 1-800-833-7958 www.geotechenv.com...
  • Page 56 Modbus Master RS485 1-800-833-7958 www.geotechenv.com...
  • Page 57 Modbus Master with RS232 (Converter Required) 1-800-833-7958 www.geotechenv.com...

  • Page 58: Configuring Sdi-12 Settings

    Modbus PLC Interface Overview The Modbus PLC Interface is a simplified method of communicating with the Aqua TROLL 500 using the Modbus protocol. It reduces programming complexity and allows the user to remove sensors and reinstall them in different ports. Please observe the following limitations when using this interface: •...

  • Page 59: Setting Up Instrument

    Holding Register Size Data Description Number Address (Registers) Type 9001 9000 uint16 Device Id: 33 = Aqua TROLL 500 Non-Vented 34 = Aqua TROLL 500 Vented 9002 9001 uint32 Serial Number 9007 9006 uint16 Firmware version (100 = 1.00) 1-800-833-7958 www.geotechenv.com...

  • Page 60: Reading Parameters

    Reading Parameters Each parameter contains a block of 7 registers as shown in the table below. To read measurements for a specific parameter, look up the starting register for that parameter from the list of Parameter Numbers and Locations in Appendix A. Once you have the starting register, add the number of offset registers for additional information about the reading.

  • Page 61: Care And Maintenance

    Care and Maintenance Storage Short-term (less than one week) Remove the restrictor Put the restrictor on the Pour 15 mL (0.5 oz) of Thread the restrictor and the end cap. instrument in calibration clean water into the onto the sonde and mode.

  • Page 62: Maintenance Schedule

    Maintenance Schedule For best results, send the instrument and sensors for factory maintenance and calibration every 12 to 18 months. User-Serviceable Parts O-rings Wiper Brush Bumpers Sensors Lubricate O-rings during Replace brush according Replace bumpers and See each sensor initial setup. Check and to site needs when collar when they are instruction sheets for...

  • Page 63: Cleaning And Storing The Ph/Orp Sensor And Ion-Selective Electrode (Ise) Sensors

    Cleaning and Storing the pH/ORP Sensor and Ion-Selective Electrode (ISE) sensors Storage Dampen the sponge Replace the caps at both inside the sensor ends of the sensor. Use storage cap with electrical tape to seal the Storage Solution or pH 4 storage cap.
  • Page 64 Replacing the Junction If the sensor fails to calibrate after you replace the fill solution, replace the reference junction. Remove sensor from Discard old solution onto Insert tube from filling Squeeze solution into sonde and unscrew a paper towel and throw solution bottle into reservoir until full.

  • Page 65: Cleaning And Storing The Rdo Sensor

    Cleaning and Storing the RDO Sensor Routine Maintenance 1. Leave the sensor cap on. 2. Rinse the sensor with clean water. 3. Gently wipe with a soft cloth or brush if biofouling is present. 4. If extensive fouling or mineral buildup is present, soak the sensor in vinegar for 15 minutes, then soak in deionized water for 15 minutes.

  • Page 66: Cleaning And Storing The Conductivity Sensor

    Cleaning and Storing the Conductivity Sensor Soaking the sensor in vinegar for longer than one hour can cause serious damage. Begin with the most gentle cleaning method and continue to the other methods only if necessary. To clean the conductivity sensor face, gently rinse with clean, cold water. If further cleaning is required, consider the nature of the debris.

  • Page 67: Service And Repair

    If you suspect your system is malfunctioning and repair is needed, you can help assure efficient servicing by following these guidelines: 1. Call or email In-Situ Technical Support. Have the product model and serial number available. 2. Be prepared to describe the problem, including how the product was used and the conditions noted at the time of the malfunction.

  • Page 68: Guidelines For Cleaning Returned Equipment

    Guidelines for Cleaning Returned Equipment Please help us protect the health and safety of our employees by cleaning and decontaminating equipment that has been subjected to potential biological or health hazards, and labeling such equipment. Unfortunately, we cannot service your equipment without such notification. Please complete and sign the form (or a similar statement certifying that the equipment has been cleaned and decontaminated) and send it to us with each instrument.

  • Page 69: More Information

    More Information To learn more about the Aqua TROLL 500, telemetry, software and other In-Situ products, see the resources listed below. Visit www.in-situ.com Find information about In-Situ water quality, water level, telemetry and other products. Download software, manuals and product instructions.
  • Page 70 EN 50581:2012 The CE mark is affixed accordingly. Ben Kimbell VP of R&D In-Situ, Inc. April 5, 2021 Copyright © 2015 In-Situ Inc. This document is confidential and is the property of In-Situ Inc. Do not distribute without approval. 1-800-833-7958 www.geotechenv.com...
  • Page 71  The UKCA mark is affixed accordingly. Ben Kimbell VP of R&D In-Situ, Inc. February 23, 2022 Copyright © 2015 In-Situ Inc. This document is confidential and is the property of In-Situ Inc. Do not distribute without approval. 1-800-833-7958 www.geotechenv.com...

  • Page 72: Appendix

    Appendix Appendix A: Parameter Numbers and Locations Holding Register Holding Register Parameter Name Default Units Number Address Temperature 5451 5450 1 = °C Pressure 5458 5457 17 = PSI Depth 5465 5464 38 = feet Level, Depth to 5472 5471 38 = feet Water Level, Surface...
  • Page 73 Holding Holding Register Parameter Name Register Default Units Address Number Total Suspended Solids 5661 5660 117 = mg/L External Voltage 5668 5667 163 = Volts Battery Capacity (remaining) 5675 5674 241 = % Rhodamine WT Concentration 5682 5681 118 = µg/L Rhodamine WT Fluorescence 5689 5688...
  • Page 74 Holding Holding Register Parameter Name Register Default Units Address Number Fluorescein WT Fluorescence 5920 5919 257 = RFU Intensity Fluorescent Dissolved Organic 5927 5926 118 = µg/L Matter Concentration Fluorescent Dissolved Organic 5934 5933 257 = RFU Matter Fluorescence Intensity Crude Oil Concentration 6004 6003...

  • Page 75: Appendix B: Unit Ids

    Appendix B: Unit IDs Abbreviation Units Celsius Fahrenheit Kelvin Pressure, Barometric Pressure (17-32) Pounds per square inch Pascals Kilopascals Bars mBar Millibars mmHg Millimeters of Mercury (0 to C) inHg Inches of Mercury (4 to C) Centimeters of water (4 to C) Inches of water (4 to C) Torr Torr...
  • Page 76 Conductivity (65-80) µS/cm Microsiemens per centimeter mS/cm Millisiemens per centimeter Resistivity (81-96) ohm-cm Ohm-centimeters Salinity (97-112) Practical Salinity Units Parts per thousand salinity Concentration Parts per million Parts per thousand (Available) (Available) mg/L Milligrams per liter µg/L Micrograms per liter (Deprecated) Grams per liter Parts per billion...
  • Page 77 Flow (209-224) Cubic feet per second (Available - was Cubic feet per minute) (Available - was Cubic feet per hour) /day Cubic feet per day gal/s Gallons per second gal/min Gallons per minute gal/hr Gallons per hour Millions of gallons per day /sec Cubic meters per second (Available - was Cubic meters per minute)
  • Page 78 Milliliters Millions of liters Thousands of liters Acre-in Acre inches % (241-256) Percent Fluorescence (257-2720 Relative Fluorescence Units Low-Flow (273-288) mL/sec Milliliters per second mL/hr Milliliters per hour L/min Liters per minute L/hr Liters per hour Current (289-304) µA Microamps Milliamps Amps Velocity (305-320)

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