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RRB YSI 600QS Cal Proced & Worksheets

By Ronald Phillips,2014-01-20 03:24
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RRB YSI 600QS Cal Proced & Worksheets

Calibration of YSI QS 600 Series Sonde w/ 650 MDS Handheld

    Getting Ready To Calibrate Calibration Tips:

1. If you use the calibration cup for dissolved oxygen (DO) calibration, make certain to loosen the seal

    to allow pressure equilibration before calibration. The DO calibration is a water-saturated air

    calibration.

2. The key to successful calibration is to insure that the sensors are completely submersed when

    calibration values are entered. Set calibration standards out ahead of time in room where calibration

    is to occur for temperature stability.

3. For maximum accuracy, use previously used calibration solution to pre-rinse the sonde. You may

    wish to save used or expired calibration standards for this purpose.

4. Fill a bucket or sink with ambient temperature tap water to rinse the sonde between calibration

    solutions.

5. Have several clean, absorbent paper towels or cotton cloths available to dry the sonde between

    rinses and calibration solutions. Shake excess rinse water off the sonde, especially when the probe

    guard is installed. Dry off the outside of the sonde and probe guard. Drying the sonde reduces carry-

    over contamination of calibrator solutions and increases calibration accuracy.

6. Remove the stainless steel weight from the sonde bottom by turning the weight counterclockwise.

    When the weight is removed, the calibration solutions have access to the sensors without displacing

    a lot of fluid. This also reduces the amount of liquid that is carried between calibrations.

7. Make certain that port plugs are installed in all ports where probes are not installed. It is extremely

    important to keep these electrical connectors dry.

    YSI handheld and sonde equipment set-up prior to calibration and sampling Once this set-up is initially done, it will not be necessary to go through these set-up procedures each

    time calibration is done:

    1. Press the Power (Green ‖) button to turn the YSI 650 MDS handheld on. 2. From the ―650 Main Menu‖ select Sonde menu.

    3. From the ―Main‖ menu screen scroll down and select Advanced. 4. From the ―Advanced Menu‖ scroll down and select Setup. 5. From the ―Advanced Setup‖ menu ensure that Auto sleep RS232 and Auto sleep SD112 are not

    enabled. It is also suggested that Power up to Run be selected in this screen. 6. Press Escape twice to return to ―Main‖ menu and select Report. 7. From the ―Report setup‖ menu scroll through and minimally enable by selecting the following:

    Temp C; SpCond uS/cm; DOsat %; DO mg/l; DO Charge; pH; and pH mV. Enable other options

    as per your instrument capabilities and your monitoring program reporting needs.

    8. While selecting SpCond in the ―Report setup‖ menu, select ―SpCond uS/cm‖ as the unit to display.

    9. Press Escape and turn power off or begin calibration process. The sonde is now set up for

    calibration and sampling.

    Red River Basin Monitoring Network Page 1 August 10, 2005

    CALIBRATION TIPS - CONDUCTIVITY

    Calibrate conductivity first to avoid contamination of the standard.

For maximum accuracy, the conductivity standard you choose should be within the same conductivity

    range as the water you are preparing to sample. However, it is not recommended to calibrate with

    conductivity standards that are less than 1.0 millisiemens/cm (mS/cm) [which is equal to 1,000

    microsiemens (μS/cm)]. These low standards are easily contaminated and can be interfered with by

    outside noise sources (RF, etc.)

TIP: During calibration for conductivity and pH, you may remove the stainless steel weight from the

    bottom of the sonde by unscrewing the weight counterclockwise. When the weight is removed, the

    calibration solutions have access to the sensors while displacing less fluid. This also reduces the

    amount of liquid that is potentially carried between calibrations.

1. Remove the sponge from the calibration bottle and pour 1-2 inches of conductivity calibration

    solution into the bottle. If you have used conductivity solution saved from your last calibration, you

    can use it for this rinsing process.

    Put the sonde in the bottle, screw the cap on firmly and shake the solution around to rinse the sonde

    and bottle. Unscrew the bottle and pour out the solution. Repeat this rinse process once more and

    then do a third rinse with fresh conductivity calibration solution.

2. Fill the calibration bottle about ? full with fresh conductivity calibration solution. Insert the sonde

    back in the bottle. Gently rotate and/or move the sonde up and down to remove any bubbles from

    the conductivity cell. The conductivity port in the side of the sonde must be completely submerged

    in calibration solution and not have any trapped bubbles in the opening.

3. Allow at least one minute for temperature equilibrium before proceeding.

4. With the YSI 650 MDS Handheld on, scroll to ―Sonde menu” and press the Enter key.

5. The handheld will make a sound that indicates you are actively connected to the sonde and its

    menus. From the displayed screen, scroll to ―Calibrate” and press the Enter key.

6. Scroll to ―Conductivity” and press Enter to access the Conductivity calibration procedure.

7. From the next ―Cond Calibration‖ screen scroll to SpCond and press Enter to access the specific

    conductance calibration procedure. Then enter the calibration value of the standard you are using.

    Note: The sonde requires the input in milliSiemens (mS/cm). 1,000 microsiemens (μS/cm) = 1

    millisiemen thus when using a 1,000 microSiemen/cm standard, enter 1.000. Record the

    conductivity of the standard being used on the calibration work sheet. Press Enter. The current

    value of all enabled sensors will appear on the screen and will change with time as they stabilize.

8. If the sonde should report “Out Of Range”, investigate the cause. Never override a calibration

    error message without fully understanding the cause. Typical causes for error messages are

    incorrect entries, for example, entering 1000 microSiemens instead of 1.0 milliSiemens. Low fluid

    level and/or air bubbles in the sonde conductivity port are other error causes.

Red River Basin Monitoring Network Page 2 August 10, 2005

9. Observe the readings under Specific Conductance or Conductivity and when they show no

    significant change for approximately 30 seconds, record the temperature and conductivity value

    being displayed as the ―pre-calibration conductivity‖ on the calibration work sheet, then press

    Enter. The top of the screen will show ―Calibrated‖ which indicates that the calibration has been

    accepted. Record the conductivity value being displayed as the ―post-calibration conductivity‖ on

    the calibration worksheet, then press Enter again to continue and return to the Calibrate menu.

10. When the calibration has been accepted check the conductivity cell constant which can be found by

    pressing Escape three times to return to the sonde’s ―Main Menu.‖ Scroll to Advanced at the

    bottom and press Enter. Press “Cal Constants” and record the conductivity cell constant value on

    the calibration work sheet. The acceptable range is 5.0 +/- 0.5. Numbers outside of this range

    usually indicate a problem in the calibration process or a contaminated standard was used. If cell

    constant is out of range or is significantly different than its historic range, clean and recalibrate.

    At this point rinse the sonde with tap water and turn the Power off or press Escape two times to return to the ―Main‖ menu and select ―Calibrate‖ to proceed with calibration for other variables as needed or replace sponge and silver weight and screw on calibration bottle for transport or storage.

Note: Recommend using small brush from YSI maintenance kit to clean sensors in conductivity ports

    at the end of each sampling day, especially in high turbidity waters.

Red River Basin Monitoring Network Page 3 August 10, 2005

CALIBRATION TIPS - pH

If initial set-up has not been done, go to the sondes report menu and turn on the pH mv output. This

    will allow the sonde to display the millivolts or the probes raw output, as well as the pH units during

    the calibration process.

Note: In most cases, a two point calibration using pH buffers 7 and 10 will be used to cover conditions

    generally found in the Red River Basin.

1. If not already done, remove the sponge from the calibration bottle and the silver weight from the

    bottom of the sonde. Pour 1-2 inches of pH 7 buffer solution into the bottle. If you have used pH 7

    buffer solution saved from your last calibration, you can use it for this rinsing process.

    Put the sonde in the bottle, screw the cap on firmly and shake the solution around to rinse the sonde

    and bottle. Unscrew the bottle and pour out the solution. Repeat this rinse process once more and

    then do a third rinse with fresh pH 7 buffer solution.

2. Fill the calibration bottle about ? full with fresh pH 7 buffer solution. Place the sonde in the bottle

    and screw the cap back on. Gently rotate and/or move the sonde up and down to remove any

    bubbles from the sensors. Ensure that the pH reference and glass sensor as well as the temperature

    sensor are completely submerged in solution.

    3. With the YSI 650 MDS Handheld on, scroll to ―Sonde menu” and press the Enter key.

    4. From the displayed ―Main‖ menu screen, scroll to ―Calibrate” and press Enter.

5. Scroll to ―ISE1 pH” and press Enter to access the pH calibration menu.

    6. From the ―pH calibration‖ screen scroll to 2 point and press Enter to access the screen to enter

    your first pH buffer value. Enter 7.00 (or the proper pH value adjusted to the temperature of the

    calibration standard if other than 25?C) and press Enter. Record the temperature and pH value of

    the pH Buffer 7 that you entered on the calibration worksheet in the ―Cal. Standard‖ section.

    7. Watch for the pH value and temperature to stabilize. When stable, record the pH and mV meter

    readings as the pH Buffer 7 ―Pre-Calibration‖ values on the calibration worksheet.

    8. Press Enter and record the pH and mV meter readings as the pH Buffer 7 ―Post-Calibrationndvalues on the calibration worksheet.. Press Enter again and screen will prompt you to ―Enter 2

    pH.‖ At this time, remove sonde from calibration bottle and pour out the pH 7 buffer. [Note:

    Consider pouring into a container marked ―used pH 7 buffer‖ which can be used as the pre-rinse

    for the next time pH calibration is done.]

     nd9. Enter 10.00 for the 2 pH value (or the proper pH value adjusted to the temperature of the

    calibration standard if other than 25?C) and press Enter. Pre-rinse the calibration bottle and sonde

    with used and fresh pH 10 buffer as you did for the pH 7 buffer. Watch the pH display to see if it

    responds and rises quickly to near the pH 10 level which is an indicator that the pH sensors are in

    good condition. Discard and then pour enough of the pH 10 buffer into the pre-rinsed calibration

    cup to cover the pH sensors.

Red River Basin Monitoring Network Page 4 August 10, 2005

10. Fill the calibration bottle about ? full with fresh pH 10 buffer solution. Place the sonde in the

    bottle and screw the cap back on. Gently rotate and/or move the sonde up and down to remove any

    bubbles from the sensors. Insure that the pH reference and glass sensor as well as the temperature

    sensor are completely submerged in solution.

11. Record the temperature and pH value of the pH Buffer 10 that you entered on the calibration

    worksheet in the ―Cal. Standard‖ section.

12. Watch for the pH value and temperature to stabilize. When stable, record the pH and mV meter

    readings as the pH Buffer 10 ―Pre-Calibration‖ values on the calibration worksheet.

13. Press Enter and record the pH and mV meter readings as the pH Buffer 10 ―Post-Calibration

    values on the calibration worksheet.

14. Remove sonde from calibration bottle and pour out pH 10 buffer. [Note: Consider pouring into a

    container marked ―used pH 10 buffer‖ which can be used as the pre-rinse for the next time pH

    calibration is done.] Rinse calibration bottle and sonde with tap water and store sonde in bottle with

    wet sponge or place sonde in wet towel for short-term storage and transport. Assess slope as per

    discussion below.

After recording the pH millivolts for the calibration points, you must determine the slope of the sensor.

    This is done by determining the difference between the two calibration points that were used, for

    example, if buffer 7 was +3 mV and buffer 10 was 177mV, the slope would be 180. The millivolts help tell us the present status of the probe; a good set of numbers to use are as follows:

    Buffer 4 = + 180 +/- 50 mv

    Buffer 7 = 0 +/- 50 mv

    Buffer 10 = - 180 +/- 50 mv

    The ideal numbers when a probe is new are between 0 and 180, but as the probe begins to age, the

    numbers will move and shift to the higher side of the tolerance. The acceptable range for the slope is

    165 to 180. Once the slope drops below a span of 165, the sensor should be taken out of service.

    Recondition the probe if a slow response in the field has been reported. The procedure can be found in

    the YSI sonde manual under the ―Sonde Care and Maintenance Section‖.

Never override any calibration errors or warnings without fully understanding the reason for the

    message. Proper storage of the sensor when not in service will greatly extend the life of the probe.

    Red River Basin Monitoring Network Page 5 August 10, 2005

CALIBRATION TIPS - DISSOLVED OXYGEN

    DISCRETE MONITORING (Spot Sampling) PREPARATION

    Preparing to calibrate Dissolved Oxygen: Inspect the DO probe anodes, recondition using the 6035 reconditioning kit if they are darkened or

    gray in color. (see instructions on pg. 90 of YSI Environmental Operations Manual). If you have

    resurfaced your DO sensor, it is recommended to run the probe continuously for 15-30 minutes or until

    good stability is realized. After a membrane change only, run the probe continuously for 3-4 minutes

    or until good stability is realized.

It is recommended to change DO membranes every 30 days. Also inspect O-ring and replace if not

    providing a tight seal. (See DO membrane installation procedure) After installing a new membrane,

    make sure that it is tightly stretched and wrinkle free. Note: DO membranes will be slightly unstable

    during the first 3 to 6 hours after they are installed; it is suggested that the final calibration of the DO

    sensor take place after this time period.

BAROMETRIC PRESSURE (BP) NOTE: If your YSI handheld does not have BP built into it you

    will need to obtain a local BP reading from a local source. If you get BP from a weather service it is

    often in inches Hg and also corrected to sea level. First you need to convert it to mm Hg by

    multiplying the inches Hg by 25.4. Then to ―uncorrect‖ for sea level use the following formula:

     True BP in mm Hg = [Corrected BP in mm Hg] [ 2.5 * (Local Altitude/100)]

    Dissolved Oxygen Calibration: 1. Note: Calibration should occur on-site in the atmospheric conditions which sampling will occur.

    Carefully remove the sensor guard and inspect the membrane to ensure that no water droplets are

    on the membraneas needed, wash off with wash bottle or gently dab with Kimwipe or other

    lens tissue to absorb the water droplets. Also dry the silver thermistor (temperature sensor) for

    accurate temperature measurements. Carefully replace the sensor guard and place the sonde in

    the calibration bottle with the wet sponge and approximately 1/8 inch of water or you may use

    the wet towel method if you prefer. Do not allow water to touch the membrane and make sure no

    water droplets are on the membrane. If using the calibration bottle, unscrew the cap slightly to

    relieve pressure, allowing equilibrium to be reached with atmospheric pressure. The sonde must

    now sit in this saturated environment for at least 10 minutes before the DO calibration can

    beginboth the DO reading and the temperature need to stabilize before starting the calibration

    sequence. It is suggested to put the sonde in the ―Run‖ mode (see step 2 below) during this time

    to allow monitoring stabilization of the DO % saturation and temperature. While monitoring

    stabilization of these readings, the DO sensor output countdown check in step 2 below can be

    performed and results recorded.

2. From the ―Main‖ menu, select Sonde run (you may need to then select Discrete Sample, then

    Start Sampling if the meter doesn’t initially start in run mode. The sonde should be in the

    discrete run mode at a 4 second rate). Immediately watch the DO% display. Observe and/or write

    down the first 10 DO % numbers. The numbers must start at a high number and drop with each

    four second sample, example: 110, 105, 102, 101.5, 101.1, 101.0, 100.8, 100.4, 100.3, 100.1. It

    does not matter if the numbers do not reach 100% or they are below 100%, or that they do not

    drop each timeit is only important that they have a high to low trend. (Note: Initial power-up

    can make the first two DO % samples read low, disregard low numbers in this position.) Should Red River Basin Monitoring Network Page 6 August 10, 2005

    the output display a negative value or start at a low number and climb up to the calibration point,

    check Reject on the calibration worksheet and examine the probe anodes, membrane, or other

    possible errorsdo not deploy the probe. If the display declines as it should, check Accept on the

    calibration worksheet. After this check, while still in the Run mode, allow the sonde to continue

    to warm up/run for a total of 10 minutes or longer while the DO% and temperature readings

    stabilize, then proceed with calibration.

    3. When DO % saturation and temperature readings are stable, press Escape to get back to the ―650

    Main Menu.‖ Scroll to and select Sonde menu.

4. From the ―Main‖ menu scroll to and select Calibrate.

    5. From the ―Calibrate‖ menu scroll to and select Dissolved Oxy.

    6. The next ―DO calibration‖ menu will offer you the option of calibrating in percent saturation or

    mg/lcalibrating either of the choices will automatically calibrate the other. Select DO %

    saturation.

7. The next ―DO Calibration‖ menu will require barometric pressure to be entered. If your handheld

    does not have barometric pressure built into it, be sure to enter your local barometric pressure in

    mm Hg as explained above. If your handheld does have barometric pressure built in, it will be

    displayed. Record the barometric pressure on your calibration worksheet. Press Enter, then

    monitor the stabilization of the DO % readings. After no changes occur for approximately 30

    seconds, record the Pre-Calibration DO% on the calibration worksheet.

    8. Press Enter to confirm the calibration. Then record the Post-Calibration DO% value and the DO

    Charge on the calibration worksheet. Press Enter again to return to the ―DO calibration‖ menu.

    Press Escape twice to return to the ―Main‖ menu.

    9. From the ―Main‖ menu scroll down to the bottom and select Advanced.

    10. From the ―Advanced‖ menu select Cal constants‖ and record the DO Gain on the calibration

    worksheet. The gain should be 1.0 with a Range of -0.3 to +0.5. The probe should now be

    successfully calibrated and ready for discrete sampling. Press Escape twice to get back to the

    ―Main‖ menu or turn the power off until ready to use. As with the other parameters any warning

    messages displayed by the sonde during the calibration are a cause for concern and must be

    investigated before deploying the sonde.

11. End of Day Calibration Check: It is recommended that at the end of your sample run to

    perform a DO calibration check. Carefully remove the sensor guard and inspect the DO

    membrane to ensure that no water droplets are on the membraneas needed, wash off with wash

    bottle or gently dab with lens tissue to absorb the water droplets. Also dry the silver thermistor

    (temperature sensor). Carefully replace the sensor guard and place the sonde in the calibration

    bottle with the wet sponge or wrap in the wet towel if using this method. If using the calibration

    bottle, unscrew the cap slightly to allow equilibrium to be reached with atmospheric pressure. Put

    in Run mode and when readings stabilize, record the DO% on your calibration worksheet as

    ―End of Day D.O. calibration check.‖

    Red River Basin Monitoring Network Page 7 August 10, 2005

Dissolved Oxygen Discrete Sampling Tips:

    1. Always prepare the equipment the day before the expected field study. Membrane changes

    should be done the day prior to the study to minimize any drift.

2. For YSI Model 6820 or similar sondes that have a separate sensor guard, the transfer of the

    sonde from the storage/calibration cup to the sensor guard puts the sonde and sensors at risk

    during the process. Usually, this is when most accidents occur, so it is best to avoid removing

    the protective sensor guard when in the field. A recommended procedure is to carry the sonde

    in a 5 gallon pail with the sonde wrapped in a wet white towel that covers the entire unit. The

    towel being wrapped around the sonde will protect it during transport from shock and vibration

    and will keep the sonde in the perfect saturated environment for pre and post calibration checks

    as needed.

3. When arriving on site, turn on the sonde and allow it to warm up for approximately 4 to 5

    minutes. Next, check the DO output. It should measure saturation in your local environment or

    barometric pressure setting, plus or minus the instrument’s tolerance of 2 percent. If you should

    find that the DO has drifted, then simply recalibrate on the spot and record the amount of drift

    that was witnessed.

4. The sonde will then be deployed and the measurements automatically taken. Remember to

    allow the sonde a few minutes to equilibrate to the water temperature before taking the reading.

    Once the data has been collected, wrap the sonde again in the wet towel and perform a

    dissolved oxygen post calibration. Again, the sonde should return to saturation, plus or minus

    the tolerance of 2 percent, within a few minutes.

    5. If you are logging the information, it is recommended that you store this pre- and post-

    calibration data in the actual site datafile. Otherwise, if you are manually recording the data,

    record the information in your log sheet. This assures anyone who might look at the records at a

    later time that the sonde was indeed calibrated and working correctly. The additions of these

    steps add very little time to the collection process and can actually save time when unexpected

    results are witnessed.

    Red River Basin Monitoring Network Page 8 August 10, 2005

    Calibration Worksheet

    Date of Handpad SN: ____________________________________ Calibration: _____________ Sonde SN: ____________________________________ Technician: ______________________

     Conductivity Calibration Record: Date: ___________ Sonde SN: ________________ Technician: ______________ Conductivity. Pre-Calibration Post-Calibration Conductivity Standard Conductivity Conductivity Cell Constant Conductivity Std. ?C (μS/cm) (μS/cm) (Range 5.0 +/- .5) __1,000 μS/cm__ ___________ ______________ _____________ ________________ NOTES: (when calibrating for ―specific conductance,‖ no temperature adjustments for the conductivity standard are needed)

     pH Calibration Record: Date: ___________ Sonde SN: _____________________ Technician: ______________ Cal. Standard Pre-Calibration Post-Calibration ?C Adj. pH pH mV pH mV pH Buffer 7 ____ _______ _______ _______ _______ _______ Range 0 MV + 50 MV pH Buffer 10 ____ _______ _______ _______ _______ _______ Range -180 + 50 MV Milli-volt span between pH 7 and 10 should be ? 165 to 180 MV _______ The ideal numbers when a probe is new are between 0 and 180, but as the probe begins to age, the numbers will move and shift to the higher side of the tolerance. The acceptable range for the slope is a span of 165 to 180. Once the slope drops below a span of 165, the sensor should be taken out of service if maintenance cannot bring it back into range. NOTES:

     Dissolved Oxygen Calib. Record: Date: ___________ Sonde SN: ________________ Technician: ______________ DO membrane changed? Y N Note: After membrane change, should wait 6 to 8 hours before final DO calibration, run sensor for 15 minutes in Discrete Run to accelerate burn-in. Corrected* Barometric Corrected [Sea level correction] Pre- Post- DO Charge DO Gain Pressure Bar. Pres. Local True Calib. Calib (Range: (Range: (Inches/Hg) x 25.4 = mm/Hg - [2.5*(Altitude/100)] =Bar.Pres. D.O. % D.O.% 50 + 25) 1.0 -.3 to +.5) _________ x 25.4 = ________ - __________ = __________ _______ _______ ________ _____________ DISSOLVED OXYGEN SENSOR OUTPUT TEST (after DO calibration probe in saturated air) After calibration, did the DO % output display the proper declining high to low trend? If so, check ______ ACCEPT ACCEPT. Should the output display a negative number or start at a low number and climb up to the calibration point, check REJECT and do not deploy the probe. ______ REJECT NOTES: (End of Day D.O. calibration check: _________)

     *Generally weather service barometric pressure readings are corrected to sea level, and cannot be used until they are ―uncorrected.‖

     Red River Basin Monitoring Network Page 9 August 10, 2005

     CALIBRATION WORK SHEET DISSOLVED OXYGEN

    Dissolved Oxygen Calib. Record: Date: ___________ Sonde SN: ________________ Technician: ______________

    DO membrane changed? Y N Note: After membrane change, should wait 6 to 8 hours before final DO

    calibration, run sensor for 15 minutes in Discrete Run to accelerate burn-in.

     Corrected*

     Barometric Corrected [Sea level correction] Pre- Post- DO Charge DO Gain

     Pressure Bar. Pres. Local True Calib. Calib (Range: (Range: (Inches/Hg) x 25.4 = mm/Hg - [2.5*(Altitude/100)] =Bar.Pres. D.O. % D.O.% 50 + 25) 1.0 -.3 to +.5)

    _________ x 25.4 = ________ - __________ = __________ _______ _______ ________ _____________ DISSOLVED OXYGEN SENSOR OUTPUT TEST (after DO calibration probe in saturated air) After calibration, did the DO % output display the proper declining high to low trend? If so, check ______ ACCEPT ACCEPT. Should the output display a negative number or start at a low number and climb up to the calibration point, check REJECT and do not deploy the probe. ______ REJECT NOTES: (End of Day D.O. calibration check: _________)

     *Generally weather service barometric pressure readings are corrected to sea level, and cannot be used until they are ―uncorrected.‖

Dissolved Oxygen Calib. Record: Date: ___________ Sonde SN: ________________ Technician: ______________

    DO membrane changed? Y N Note: After membrane change, should wait 6 to 8 hours before final DO

    calibration, run sensor for 15 minutes in Discrete Run to accelerate burn-in.

     Corrected*

     Barometric Corrected [Sea level correction] Pre- Post- DO Charge DO Gain

     Pressure Bar. Pres. Local True Calib. Calib (Range: (Range: (Inches/Hg) x 25.4 = mm/Hg - [2.5*(Altitude/100)] =Bar.Pres. D.O. % D.O.% 50 + 25) 1.0 -.3 to +.5)

    _________ x 25.4 = ________ - __________ = __________ _______ _______ ________ _____________ DISSOLVED OXYGEN SENSOR OUTPUT TEST (after DO calibration probe in saturated air) After calibration, did the DO % output display the proper declining high to low trend? If so, check ______ ACCEPT ACCEPT. Should the output display a negative number or start at a low number and climb up to the calibration point, check REJECT and do not deploy the probe. ______ REJECT NOTES: (End of Day D.O. calibration check: _________)

     *Generally weather service barometric pressure readings are corrected to sea level, and cannot be used until they are ―uncorrected.‖

Dissolved Oxygen Calib. Record: Date: ___________ Sonde SN: ________________ Technician: ______________

    DO membrane changed? Y N Note: After membrane change, should wait 6 to 8 hours before final DO

    calibration, run sensor for 15 minutes in Discrete Run to accelerate burn-in.

     Corrected*

     Barometric Corrected [Sea level correction] Pre- Post- DO Charge DO Gain

     Pressure Bar. Pres. Local True Calib. Calib (Range: (Range: (Inches/Hg) x 25.4 = mm/Hg - [2.5*(Altitude/100)] =Bar.Pres. D.O. % D.O.% 50 + 25) 1.0 -.3 to +.5)

    _________ x 25.4 = ________ - __________ = __________ _______ _______ ________ _____________ DISSOLVED OXYGEN SENSOR OUTPUT TEST (after DO calibration probe in saturated air) After calibration, did the DO % output display the proper declining high to low trend? If so, check ______ ACCEPT ACCEPT. Should the output display a negative number or start at a low number and climb up to the calibration point, check REJECT and do not deploy the probe. ______ REJECT NOTES: (End of Day D.O. calibration check: _________)

     *Generally weather service barometric pressure readings are corrected to sea level, and cannot be used until they are ―uncorrected.‖

Red River Basin Monitoring Network Page 10 August 10, 2005

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