Myron L Ultrapen PT6 User manual

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INTRODUCTION
Thank you for selecting the Myron L®Company Ultrapen™ PT6 Nitrate Pen. This instrument is designed to be accurate, fast,
and simple to use in diverse water quality applications. Advanced features include:
•Selectable Units for Displaying Nitrate Concentration in ppm as Nitrogen (NO3
--N), or Nitrate (NO3 -), or in millivolt (mV)
•1 or 2 point Calibration Options with Choice of 4 Standard Solutions
•Proprietary ISE Sensor Design
•Built in Double Junction Reference Electrode, No Need for External Reference
•Compatible with EPA Approved Standard Method 4500-NO3
-D
•Live or Hold Mode – User Selectable
•Auto-Off feature – User Adjustable
•Rugged Design with Aircraft Aluminum Body
•Durable, Epoxy Encapsulated Electronics
•Waterproof
CONTENTS INCLUDE:
1. Ultrapen™ Pocket Tester Model PT6
2. User Replaceable Nitrate Sensor – Installed
3. 100 ppm NO3
--N Standard Solution, 2 oz.
4. Ionic Strength Adjuster (ISA), 2 oz.
5. Graduated Cylinder with Cap, 2 ea.
6. 100 µLPipette with Tip
7. Protective Cap
8. Pocket Clip
9. Lanyard
10. One N Type Battery – Installed
QUICK REFERENCE INSTRUCTIONS
1. Press and release the push button to turn the PT6 ON.
2. While the LED flashes rapidly: Dip the pen in prepared sample solution so the sensor is totally submerged.
3. Swirl the pen to remove any bubbles that may be trapped in the sensor.
4. While the LED flashes slowly: Hold the pen steady in the sample solution, keeping the sensor submerged.
5. In HOLD mode – Real time readings are displayed until the LED turns solid ON. The display holds the final
reading briefly then the PT6 turns OFF.
6. In LIVE Mode – The PT6 will display constant, real-time measurements for up to 5 minutes then turn OFF.
ULTRAPEN FEATURES
1. PUSH BUTTON– Turns the PT6 ON, selects
instrument settings, and initiates calibration.
2. BATTERY CAP– Unscrew to access battery for
replacement.
3. BATTERY INDICATOR – Shows battery charge
level.
4. DISPLAY– Displays measurements, menu options,
battery indicator, and firmware revision (during power-
up).
5. LED INDICATOR LIGHT– Indicates when to dip
the PT6 in solution, when the measurement is in
progress, and when to remove the PT6 once the
measurement is complete.
6. NITRATE SENSOR– Contains the double junction
reference electrode, and nitrate ion selective electrode.
7. ISE ELECTRODE – Contains the Nitrate ISE membrane.
8. THERMISTOR – Measures temperature of sample solution.
9. PROTECTIVE CAP – Protects sensor and holds solution for conditioning sensor. To remove, wiggle the cap side to side
while pulling it off.
•Use caution not to spill conditioning solution. Verify the sensor remains fully inserted into the PT6. If not, reinstall per
Nitrate Sensor Replacement Instructions (see MAINTENANCE).
•To replace, wiggle the cap side to side while pushing it on.
10. CAP STOP – Shows how far to push the protective cap when putting it on the PT6.
•DO NOT push the protective cap beyond the cap stop as sensor damage may occur.
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Myron L®Company
– ULTRAPEN™ PT6 –
Operation Manual
Nitrate Concentration and Temperature Pen

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MENU OPTIONS
The PT6 Menu allows the user to navigate through the available function/setting options. See detailed instructions below for
complete instructions on each function/setting option.
To get to the menu, simply press and release the push button to turn the PT6 ON, then push and hold the push button. The PT6
display will alternate between the following options:
•CAL – Calibration Menu
•FAC CAL – Factory Calibration Menu
•ºCºF TEMP – Temperature Unit Selection Menu
•ModE SEL – Mode Selection Menu
•PAr SEL – Nitrate Parameter Selection Menu
•SEnSor √– Sensor Check Menu
•ESC – Escapes/Exits the Menu and immediately powers the PT6 OFF
Release the push button while the desired option is displayed. See detailed instructions below.
ULTRAPEN SETTINGS
NOTE: In all menus, selecting “ESC” immediately powers the PT6 OFF without saving changes to the settings.
I. NITRATE PARAMETER SELECTION
The PT6 allows you to select how you wish to display the nitrate concentration readings: Nitrate as Nitrogen (NO3
--N) displayed
as ppm N, Nitrate (NO3
-) displayed as ppm NO3, or millivolt displayed as mV.
To select a parameter for display:
1. Press and release the push button to turn the PT6 ON.
2. Push and hold the push button to enter menu mode.
3. Release the push button while “PAr SEL” is displayed.
4. The display will alternate between “PUSHnHLD” and “PAr SEL”.
5. Push and hold the push button. The display will alternate between the following:
•“N” (displays Nitrate as Nitrogen and Temperature)
•“NO3” (displays Nitrate and Temperature)
•“mV” (displays millivolts and Temperature)
•“ESC”
6. Release the push button when desired parameter type is displayed.
•“SAVEd” will display, then the PT6 will power OFF.
II. TEMPERATURE UNIT SELECTION
The PT6 allows you to select the type of units used for displaying temperature; ˚C (Celsius) or ˚F (Fahrenheit).
To select the Temperature Units:
1. Press and release the push button to turn the PT6 ON.
2. Push and hold the push button to enter menu mode.
3. Release the push button while “˚C˚F TEMP” is displayed.
4. The display will alternate between “PUSHnHLD” and “˚C˚F TEMP”.
•Push and hold the push button. The display will alternate between “˚C” (Celsius), “˚F” (Fahrenheit), and “ESC”.
5. Release the push button when desired unit is displayed.
6. “SAVEd ˚C” or “SAVEd ˚F” will display, then the PT6 will power OFF.
III. MODE SELECTION
The PT6 allows you to select between two measurement modes; Live mode or Hold mode.
HOLD mode (Default) – Real-time readings are displayed until the LED turns solid ON. The display holds the final reading
briefly then the PT6 turns OFF.
LIVE mode – Real-time readings are displayed continuously for up to 5 minutes. A press and release of the push button will turn
your PT6 OFF immediately. User may select auto-off timeout period from 140 to 300 seconds.
To select the mode:
1. Press and release the push button to turn the PT6 ON.
2. Push and hold the push button to enter menu mode.
3. Release the push button while “ModE SEL” is displayed.
4. The display will alternate between “ModE SEL” and “PUSHnHLD”.
5. Push and hold the push button. The display will alternate between “Hold”, “LIVE” and “ESC”.
6. Release the push button when the desired mode is displayed.
•If Hold mode is selected: “SAVEd” will display, then the PT6 will power OFF.

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•If LIVE mode is selected you will be prompted to set the auto-off time: The display will alternate between “PUSH CONT”
and “[value] SEC”. Press and release repeatedly or push and hold to adjust the time out period. The display will scroll from
140 to 300 seconds, then repeat. When you have selected the desired timeout period, let the PT6 time out.
SENSOR CONDITIONING
If the sensor is new and/or has been stored dry, the sensor needs to be conditioned before calibration or measurement.
1. Remove the protective cap. Rinse the sensor with clean water (preferably DI, RO, or distilled) and pat it dry with a clean soft
lint-free cloth.
2. Fill the protective cap half-full with PREPARED calibration solution (with Nitrate ISA added, See PREPARING
CALIBRATION SOLUTION, below), carefully put the cap back on the sensor for conditioning (using caution as excess
solution may squirt out). It may take up to an hour for sensor to restore stable readings after dry storage.
NOTE: For best results, you should always condition your sensor using a PREPARED calibration solution with a value
close to the lower end of the concentration values you will be measuring.
CALIBRATION
The Myron L®Company recommends calibrating the PT6 before each series of tests, depending on usage. The PT6 offers 1-point
or 2-Point calibration and is calibrated in Nitrate as Nitrogen (NO3
--N) using 1, 10, 100, or 1000 ppm Standard Solutions. For
greatest accuracy complete a 2-point calibration, selecting the closest Standard Solutions above and below your expected test
solution range (example: If you are measuring test solutions in the range of 200 to 400 ppm NO3
--N, then you would want to
calibrate using 100 ppm and 1000 ppm Standard Solutions). Calibration solutions must be prepared prior to use.
Calibration is always done in Nitrate as Nitrogen (NO3
--N) even if your PT6 is set to measure in Nitrate (NO3 -). To select the
optimal Standard Solutions and to verify calibration, see the CONVERSION TABLE below.
CONVERSION TABLE
Standard Solution
Value in NO3
--N
Value in NO3
-
N1SOL
1 ppm
4.4 ppm
N10SOL
10 ppm
44 ppm
N100SOL
100 ppm
440 ppm
N1000SOL
1000 ppm
4400 ppm
NOTES
•Always start with the lower calibration point first.
•For greatest accuracy, keep the temperature of prepared calibration solution(s) the same as the test solution. The
temperature difference should be within ±2oC.
•Nitrate sensor should be conditioned prior to performing a calibration (see Sensor Conditioning, above).
I. PREPARING CALIBRATION SOLUTION
Calibration solution(s) must be prepared prior to calibration. For each standard solution selected:
1. Fill a Graduated Cylinder to the 10 mL line with the Standard Solution.
2. Add 200 µL of the Nitrate ISA solution to the Graduated Cylinder (using the supplied 100 µL pipette).
NOTE: When using the pipette to draw, depress pipette to 1st stop, then place tip in ISA solution and release slowly. To
dispense, depress pipette completely to the 2nd stop.
NOTE: Do not contaminate the pipette tip by touching it with your fingers or setting it in a dirty toolbox. Do not dip the
pipette tip in the calibration solution as this will cause cross-contamination between solutions.
3. Replace the cap on the Graduated Cylinder and shake well to mix the prepared calibration solution.
II. 2-POINT CALIBRATION
To perform a 2-Point calibration you will need two prepared calibration solutions, clean water (preferably DI, RO, or distilled),
and a clean, dry, lint-free cloth.
1. Remove the protective cap. Rinse the sensor for about 5 seconds with clean water (preferably DI, RO, or distilled) and pat it
dry with a clean soft lint-free cloth.
2. Press and release the push button to turn the PT6 ON.
3. Push and hold the push button to enter menu mode.
4. Release the button while “CAL” is displayed. The display will alternate between “PUSHnHLD” and “CAL”.
5. Push and hold the push button. The display will alternate between “1ppm”, “10ppm”, “100ppm”, “1000ppm”, and “ESC”.

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6. Release the push button while the desired calibration solution value is displayed. (Remember to calibrate the lower value
first). The LED will begin to flash rapidly.
7. While the LED flashes rapidly, dip the pen in the prepared calibration solution so that the sensor is completely submerged and
swirl it around to remove any bubbles that may have been caught in the sensor.
8. While the LED flashes slowly, the display will show “[value] ppm”. Hold the sensor steady during calibration.
9. If the first calibration point is successful, the display will indicate “SAVEd”, then “PUSHnHLD” will be displayed.
10. Rinse the sensor in clean water (preferably DI, RO, or distilled) and pat it dry with a clean soft lint-free cloth (you will have
up to 25 seconds for this step).
11. Push and HOLD the push button to continue. The display will alternate between the remaining options for calibration values.
NOTE: If you press and release the button at this point, or let the pen timeout, a 1-point calibration will be stored. You would
need to start over for a 2-point calibration.
12. Release the push button while the 2nd calibration point value is displayed. The LED will begin flashing rapidly.
13. While the LED is flashing rapidly, dip the pen in the 2nd prepared calibration solution so that the sensor is completely
submerged and swirl it around to remove any bubbles that may have been caught in the sensor.
14. While the LED flashes slowly, the display will alternate between “CAL” and “[value]”. Hold the sensor steady during
calibration.
15. If the second calibration point is successful, the display will indicate “SAVEd 2PT” and the PT6 will power OFF.
16. Verify calibration by retesting the prepared calibration solutions. The values should be within ±10% of the stated value of the
standard solutions.
17. Remove the sensor from the solution and rinse it with clean water (preferably DI, RO, or distilled) and pat it dry with a clean
soft lint-free cloth. Use caution not to touch the ISE membrane.
18. Fill the protective cap half-full with lower valued prepared calibration solution. Carefully put the cap back on the sensor for
conditioning (using caution as excess solution may squirt out).
NOTE: Individual calibration points can be verified by retesting the prepared calibration solutions. The PT6 will also check the
gain/slope of the calibration during a 2-point calibration. If, after the second calibration point the PT6 detects an error in the
gain/slope, it will display “Error”. If this happens, clean and condition the sensor, then verify you are using approved and properly
prepared calibration solutions, and recalibrate.
NOTE: If at any point during calibration you do not submerge the sensor in solution before the flashing slows, allow the pen to
power OFF and start over.
III. 1-POINT CALIBRATION
1. Remove the protective cap. Rinse the sensor for about 5 seconds with clean water (preferably DI, RO, or distilled) and pat it
dry with a clean soft lint-free cloth.
2. Press and release the push button to turn the PT6 ON.
3. Push and hold the push button to enter menu mode.
4. Release the button while “CAL” is displayed. The display will alternate between “PUSHnHLD” and “CAL”.
5. Push and hold the push button. The display will alternate between “1 ppm”, “10 ppm”, “100 ppm”, “1000 ppm”, and “ESC”.
6. Release the push button while the desired calibration solution value is displayed. The LED will begin to flash rapidly.
7. While the LED flashes rapidly, dip the pen in the calibration solution so that the sensor is completely submerged and swirl it
around to remove any bubbles that may have been caught in the sensor.
8. While the LED flashes slowly, the display will show “[value] ppm”. Hold the sensor steady during calibration.
9. If the calibration is successful, the display will indicate “SAVEd”, then “PUSHnHLD” will be displayed.
10. Press and release the button to exit or allow the PT6 to time out WITHOUT pushing the button.
11. Verify calibration by retesting the prepared calibration solution. The value should be within ±10% of the stated value of the
standard solution.
12. Fill the protective cap half full with prepared calibration solution. Carefully put the cap back on the sensor for conditioning
(using caution as excess solution may squirt out).
NOTE: If at any point during calibration you do not submerge the sensor in solution before the flashing slows, allow the pen to
power OFF and start over.
IV. FACTORY CALIBRATION
The PT6 can be returned to factory default calibration using the FAC CAL function. This will erase any stored wet calibration.
NOTE: Default factory calibration resets the electronics only and does NOT take the condition of the sensor into consideration.
To return your unit to factory calibration:
1. Press and release the push button to turn the PT6 ON.
2. Push and hold the push button to enter menu mode.
3. Release the button when “FAC CAL” displays. The display will alternate between “PUSHnHLD” and “FAC CAL”.
4. Push and hold the push button. “SAVEd FAC” will be displayed indicating the pen has been reset to its factory calibration.

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NITRATE MEASUREMENT
I. MEASUREMENT PREPARATION
The following steps should be taken prior to performing a measurement with your PT6:
1. Perform a calibration check with calibration solution, and if the reading is off more than 10%, calibrate the PT6. (See
CALIBRATION).
2. Prepare test solution:
a. Fill the Graduated Cylinder to the 10 mL line with solution to be tested.
b. Add 200 µL of the Nitrate ISA Solution to the Graduated Cylinder (using the supplied 100 µL pipette).
NOTE: When using the pipette to draw, depress pipette to 1st stop, then place tip in solution and slowly release. To
dispense, depress pipette completely to the 2nd stop.
NOTE: Do not contaminate the pipette tip by touching it with your fingers or setting it in a dirty toolbox. Do not dip the
pipette tip in the calibration solution as this will cause cross-contamination between solutions.
c. Replace the cap on the Graduated Cylinder and shake well to mix the prepared test solution.
II. NITRATE MEASUREMENT
For highest accuracy, the temperature of the calibration solution(s) should be the same as the temperature of the test
solution(s). The temperature difference should be no more than ±2oC/±3.6oF.
1. Remove the protective cap. Rinse the sensor for about 5 seconds with clean water (preferably DI, RO, or distilled) and pat it
dry with a clean soft lint-free cloth.
2. Press and release the push button to turn the PT6 ON.
3. Dip the PT6 sensor in the prepared test solution and swirl it around to remove any air bubbles.
4. Hold the PT6 sensor steady in the solution while the measurement is taking place.
The following table explains what the LED Indicator Light signals indicate and gives the duration of each signal:
LED SIGNAL
ACTION
DURATION
Rapid Flashing
Dip sensor in solution and swirl to remove bubbles.
6 sec
Slow Flashing
Measurement in process; hold the sensor steady during measurement.
In HOLD mode real-time readings are displayed until the LED is ON solid.
In LIVE mode real-time readings are displayed until the PT6 turns OFF.
90 sec in HOLD mode
Up to 300 sec in LIVE mode
Solid Light (HOLD mode only)
Measurement is complete. Values are displayed until the PT6 turns OFF.
6 sec
5. Remove the sensor from the solution and rinse with clean water (preferably DI, RO, or distilled) and pat it dry with a clean
soft lint-free cloth. Use caution not to touch the ISE membrane.
6. Fill the protective cap half full with prepared calibration solution. Carefully put the cap back on the sensor for conditioning
(using caution as excess solution may squirt out).
NOTE: You can turn OFF the unit at any time during LIVE measurement with a simple press and release of the push button.
•For best results when measuring solution at the extremes of the specified temperature or nitrate range allow the PT6 to
equilibrate by submerging the sensor in the sample solution for 1 minute prior to taking a measurement.
•ALWAYS make sure the nitrate sensor is completely submerged in the solution being tested.
•For multiple samples, regularly perform a calibration check with calibration solution between sample measurements.
III. INTERFERENCE
Other anions in solution may interfere with nitrate measurement, depending on the species and their relative levels to nitrate. The
impact of interference ions on measurements can be expressed by the Nikolsky equation.
𝐸=𝐶𝑜𝑛𝑠𝑡𝑎𝑛𝑡 +!.!"!!"
!!!log (𝑎 +𝐾!
𝑎!
!!!!)
Where 𝐸- the voltage sensor measures
𝑎 - the activity of nitrate
𝑎!- the activity of interference ion
𝑧!- the charge of the interference ion with sign
𝐾!
–the Selectivity coefficient of the interference ion for nitrate measurement
Generally, interference ions may cause positive errors for the measurement. The higher selectivity coefficient the interference ion
has, the higher error it may cause at a given concentration. The approximate selectivity coefficients of PT6 for some anions are
SO4
2-
Cl-
CH3COO-
K(NO3
-/x)
0.00016
0.007
0.0007

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listed above. For example, if the activity of Cl-is ten times higher than nitrate in the sample, Cl-may cause 7% error for the nitrate
measurement, while CH3COO-and SO4
2- in the same ratio may only cause 0.7% and 0.05% error, respectively.
When testing samples with high interference levels, such as wastewater, chlorinated water, and soil water, the interference ions
will be counted as nitrate with the coefficient factor and cause measurement errors. Some commonly existing interference ions,
such as Cl-, Br-, I-, S2-, HCO3
-and NO2 -can be reduced by using Nitrate Interference Suppression Buffer (NISB). Add NISB at 1:1
volume ratio to all sample/standard solutions (e.g. add 5 mL NISB to 5 mL solution) in place of ISA throughout the sensor
conditioning, calibration and measurement.
NOTE: Nitrate Interference Suppression Buffer (NISB) is purchased separately, see ACCESSORIES.
NOTE: When using NISB, do NOT add ISA. White precipitate may form in sample solution after mixing with NISB, it will not
affect the measurement.
NOTE: Strong interference ions such as ClO4
-and SCN-require their concentrations to be up to 2000x lower than nitrate in the
sample to avoid high errors.
IV. MEASUREMENT VALIDATION METHODS:
1. Calibration Check:
a. Choose one standard solution within the testing range, and prepare the solution according to the measurement procedure.
b. Test readings in the standard solution and the value should be within 10% of the expected value. If not, the measurement
result may not be reliable. The source of error should be identified and the measurement should be redone after
correction.
2. Known Addition Recovery Check:
This validation method works well for validating low concentration measurement (1-60 ppm-N) by using concentrated
standard solutions to increase the nitrate concentration in the sample by a known value, optimally double the measured value,
and then compare the value with the increase in Pen readings. For about 10 mL sample, one spike of standard solution with
the 100 µL pipette will increase the sample nitrate concentration by roughly 1% of the standard solution concentration,
example ~1 ppm increase by one spike of 100 ppm standard solution, ~10 ppm increase by one spike of 1000 ppm standard
solution.
Spike reference for different sample concentration for 10 mL sample volume (V/mL)
Measured Sample Concentration (ppm NO3
--N)
×100 µL pipette
Standard Solution (ppm NO3
--N)
1-3
1
100
3-9
3
100
9-20
1
1000
20-60
3
1000
a. Add nspikes (volume increase: 𝑽𝒂𝒅𝒅=0.1×n/mL) of standard solution (Cs/ppm) to the sample solution after measurement
(C1/ppm) and swirl for mixing.
b. Take the 2nd measurement (C2/ppm) and calculate the recovery using the following equation.
𝑅𝑒𝑐𝑜𝑣𝑒𝑟𝑦 %=
𝐶!×100
𝑉×𝐶!+𝑉
!"" ×𝐶!×(1/(1−𝐷 !))
(𝑉
!"" +𝑉)
Where Df is the dilution factor when spiking unprepared standard solutions, 1/51 for using ISA and ½for using NISB. If
adding prepared standard solutions, Df is 0.
The recovery should be within 10% of the expected value. If not, the measurement result may not be reliable. The source of
error should be identified and the measurement should be redone after correction.
MAINTENANCE
I. ROUTINE MAINTENANCE
1. After each use ALWAYS rinse the Nitrate sensor with clean water (preferably DI, RO, or distilled) and then carefully pat the
sensor with a clean, soft, lint-free cloth to remove any water drops.
2. ALWAYS replace the protective cap on the Nitrate sensor after each use.
3. Do not touch the ISE membrane as oil from your finger may contaminate the sensor.
4. Do not drop, throw, or otherwise strike the PT6 as this may void the warranty.
5. Do not store the PT6 in a location where the ambient temperatures exceed its operating/storage temperature limits.

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6. The Nitrate sensor needs to be conditioned after dry storage, see SENSOR CONDITIONING.
II. STORAGE
After each use ALWAYS rinse the Nitrate sensor with clean water (preferably DI, RO, or distilled) and then carefully pat the
sensor with a clean soft lint-free cloth to remove any water drops.
1. Short term storage (<=3 days):
Keep the sensor in the protective cap filled half-full with prepared 100 ppm standard solution (DO NOT use standard solution
prepared with NISB for storage). Store the PT6 in a cool place.
2. Long term storage (>3 days):
a. Rinse the Nitrate sensor with clean water (preferably DI, RO, or distilled) and then carefully pat the sensor with a clean
soft lint-free cloth to remove any water drops.
b. Rinse the protective cap with clean water (preferably DI, RO, or distilled), pat with a clean soft lint-free cloth to remove
any water drops.
c. Put the protective cap on the sensor and store the PT6 in a cool place.
III. BATTERY REPLACEMENT
The PT6 display has an indicator that depicts the PT6’s battery charge
level. When the charge level indicator only shows one bar,
immediately replace the battery with a new N type battery.
1. In a CLEAN and DRY place unscrew the battery cap in a counter-
clockwise motion.
2. Slide the cap and battery housing out of the PT6.
3. Remove the depleted battery from its housing.
4. Insert a new battery into the battery housing oriented with the
negative end touching the spring.
5. Align the groove along the battery housing with the guide bump
inside the PT6 case and slide the battery housing back in.
6. Screw the battery cap back on in a clockwise direction. Do not over tighten.
IV. REPLACING OR REINSTALLING THE NITRATE SENSOR
•Follow the instructions that come with your replacement sensor.
•Only remove/replace the Nitrate sensor in a CLEAN and DRY environment.
To remove the Nitrate sensor:
1. Remove the protective cap by wiggling it side to side while you pull it off the PT6.
2. Make sure the PT6 (including the sensor) is clean and dry.
3. Loosen the battery tray (to allow pressure equalization).
4. Firmly grasp the sensor body and slowly pull the sensor out. DO NOT allow any dust or moisture into the body of the PT6.
To install a new Nitrate sensor:
1. Line up the alignment tabs on the sensor with the alignment slots on the PT6 unit.
2. Gently push the sensor into position.
3. Tighten the battery cap.
NOTE: The PT6 MUST be recalibrated any time the Nitrate sensor is replaced.
V. TROUBLESHOOTING
1. SENSOR CHECK
Sensor Check verifies the slope of the recent calibration. If readings are not as expected, or measurements of calibration solutions
after calibration are not within ±10% of the printed value, checking the slope of current calibration can be a starting point for
troubleshooting. To do a Sensor Check:
1. Press and release the push button to turn the PT6 ON.
2. Push and hold the push button to enter menu mode.
3. Release the button while “SEnSor √” is displayed. The display will flash “SEnSor √” and then indicate the mV value of the
slope for current calibration.
4. A gain ranging between -50 to -62 mV indicates a normal calibration in the linear range. Values beyond that may indicate a
calibration out of the linear range, an insufficiently conditioned sensor, or a worn membrane. Most of the time the issue can
be resolved by conditioning the sensor for at least one hour and re-doing a 2-point calibration. If the problem persists, the
sensor should be replaced.
NOTE: The gain range of -50 to -62 mV is based on a calibration temperature of 25˚C.

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2. UNSTABLE READINGS / SLOW RESPONSE
A soiled membrane or dry reference junction can cause unstable/slow response of sensors. Rinse the sensor with plenty of water
and recondition the sensor in 100 ppm standard solution for at least one hour.
Temperature changes, pH variation of solutions, or ambient electrical noise may also contribute to the issue. The source should be
identified and corrected.
SPECIFICATIONS
Nitrate as Nitrogen NO3
--N
Nitrate NO3
-
Temperature
Ranges
1-1400 ppm
4.4-6200 ppm
0-71˚C / 32-160˚F
Accuracy1
±10% of the reading
±10% of the reading
± 0.1°C
Resolution
0.1 ppm
0.1 ppm
0.1°C/F
pH Range: 3 to 11 pH
Time to Reading Stabilization: 10 - 180 seconds
Power Consumption: Active Mode: 33 - 140 mA
Physical Dimensions: 17.15 cm L x 1.59 cm D or 6.75 in. L x .625 in. D
Weight: 54 g or 1.94 oz.
Case Material: Anodized Aircraft Aluminum with Protective Coating
Battery Type: One N type, Alkaline 1.5 V
Calibration Standard Solutions: 1, 10, 100, or 1000 ppm NO3
--N
Operating / Storage Temperature: 0-40ºC / 32-104ºF 2
Enclosure Ratings: IP67 and NEMA 6
EN61236-1: 2006 - Annex A: 2008: Electrostatic discharge to the PT6 may cause it to spontaneously power ON.
In this case, the PT6 will power OFF after several seconds.
WARNING!These products can expose you to chemicals including Di(2-ethylhexyl)phthalate (DEHP), which is known to the
State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov
1Accuracy of measuring calibration solutions after Temperature Controlled 2-Point Calibration with one order of concentration difference.
2For extended life of the sensor, store the PT6 in a cool location (5-25˚C). DO NOT FREEZE!
EPA Approved Standard Method 4500-NO3
-D*
This method using the nitrate ion selective electrode is one of EPA approved methods for measuring nitrate in drinking water and
wastewater, listed in USA Code of Federal Regulations Title 40 Part 136 and Part 141. The PT6 is compatible to follow this
method. Consult with your regulator for reporting purposes.
* Standard Methods for the Examination of Water and Wastewater 20th Edition, published by American Public Health Association,
Washington, D.C., 20005. USA. www.standardmethods.org.
ACCESSORIES
STANDARD SOLUTIONS FOR CALIBRATION:
The ULTRAPEN™ PT6 can be calibrated with 1, 10, 100, or 1000 ppm NO3
--N Standard Solution.
Order Models:
•N1SOL - 1 ppm NO3
--N (Nitrate as Nitrogen) Standard Solution
•N10SOL - 10 ppm NO3
--N (Nitrate as Nitrogen) Standard Solution
•N100SOL - 100 ppm NO3
--N (Nitrate as Nitrogen) Standard Solution
•N1000SOL - 1000 ppm NO3
--N (Nitrate as Nitrogen) Standard Solution
IONIC STRENGTH ADJUSTER:
Order Model: NISASOL
NITRATE INTERFERENCE SUPPRESSION BUFFER:
Order Model: NISBSOL
REPLACEMENT NITRATE SENSOR:
Order Model: RPT6
WARRANTY
The PT6, excluding the sensor and battery, has a one (1) year limited warranty.
The Nitrate sensor has a six (6) month limited warranty.
MYRON L®COMPANY
2450 Impala Drive uCarlsbad, CA 92010-7226 uPhone: [phone]
E-Mail: Customer Service – [email protected] uTechnical Support – [e-mail]
Website: www.myronl.com
PT6OM 09/18