Pyxis SP-600 User manual

SP-600 Water Mulmeter
User Manual
May 4, 2020
Rev. 1.01
Pyxis Lab, Inc.
1729 Majesc Dr. Suite 5
Lafayee, CO 80026 USA
www.pyxis-lab.com
© 2017 Pyxis Lab, Inc.
Pyxis Lab Proprietary and Condenal

Table of Contents
1 Introducon 3
1.1 MainFeatures......................................... 3
2 Specicaons 4
3 Unpacking Instrument 4
3.1 StandardAccessories ..................................... 5
3.2 OponalAccessories ..................................... 5
4 Installaon 5
4.1 Main Module Baery Installaon . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4.2 pH/ORP Module Baery Installaon . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5 Instrument Overview 7
5.1 pH/ORPCellCapSeal ..................................... 8
5.2 ControlKeys.......................................... 8
5.3 MainModuleOn/O ..................................... 9
5.4 pH/ORPModuleOn/O.................................... 9
6 Measurement 9
6.1 SwitchMeasurementMode ................................. 9
6.2 ConducvityMeasurement.................................. 10
6.3 Total Dissolved Solids (TDS) Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . 10
6.4 ResisvityMeasurement ................................... 13
6.5 DPD Free and Total Chlorine Measurement . . . . . . . . . . . . . . . . . . . . . . . . . 13
6.6 TemperatureMeasurement.................................. 15
6.7 pH/ORPMeasurement .................................... 15
7 Calibraon 17
7.1 ConducvityCalibraon.................................... 17
7.2 DPD Free and Total Chlorine Calibraon . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
7.3 pHCalibraon......................................... 27
7.4 ORPCalibraon ........................................ 29
8 Device Informaon and Diagnosis 30
8.1 Conducvity/Chlorine Sample Cell Cleanliness Check . . . . . . . . . . . . . . . . . . . . 31
8.2 Bluetooth Connecon to Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
8.3 FactoryReset ......................................... 33
9 Use with uPyxis® Mobile App 34
9.1 Download uPyxis® MobileApp................................ 34
9.2 Connecng to uPyxis® MobileApp.............................. 34
9.3 SystemScreen......................................... 35
9.4 SengScreen......................................... 36
9.5 DatalogScreen ........................................ 37

10 Use with uPyxis® Desktop App 38
10.1 Install uPyxis® DesktopApp.................................. 38
10.2 Connecng to uPyxis® DesktopApp ............................. 38
10.3SystemScreen......................................... 39
10.4SengScreen......................................... 40
10.5DatalogScreen ........................................ 40
11 Device Maintenance and Precauon 41
11.1MaintenanceBestPracces.................................. 41
11.2 Methods to Cleaning the SP-600 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
11.3Storage ............................................ 42
11.4 pH/ORP Module Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
12 Regulatory Approval 45
13 Contact Us 45
SP-600 User Manual [email protected] | [phone]

Warranty Informaon
Condenality
The informaon contained in this manual may be condenal and proprietary and is the property of Pyxis
Lab, Inc. Informaon disclosed herein shall not be used to manufacture, construct, or otherwise reproduce
the goods described. Informaon disclosed herein shall not be disclosed to others or made public in any
manner without the express wrien consent of Pyxis Lab, Inc.
Standard Limited Warranty
Pyxis Lab warrants its products for defects in materials and workmanship. Pyxis Lab will, at its opon, repair
or replace instrument components that prove to be defecve with new or remanufactured components
(i.e., equivalent to new). The warranty set forth is exclusive and no other warranty, whether wrien or oral,
is expressed or implied.
Warranty Term
The Pyxis warranty term is thirteen (13) months ex-works. In no event shall the standard limited warranty
coverage extend beyond thirteen (13) months from original shipment date.
Warranty Service
Damaged or dysfunconal instruments may be returned to Pyxis for repair or replacement. In some in-
stances, replacement instruments may be available for short duraon loan or lease.
Pyxis warrants that any labor services provided shall conform to the reasonable standards of technical com-
petency and performance eecve at the me of delivery. All service intervenons are to be reviewed and
authorized as correct and complete at the compleon of the service by a customer representave, or des-
ignate. Pyxis warrants these services for 30 days aer the authorizaon and will correct any qualifying
deciency in labor provided that the labor service deciency is exactly related to the originang event. No
other remedy, other than the provision of labor services, may be applicable.
Repair components (parts and materials), but not consumables, provided during a repair, or purchased
individually, are warranted for 90 days ex-works for materials and workmanship. In no event will the in-
corporaon of a warranted repair component into an instrument extend the whole instrument’s warranty
beyond its original term.
Warranty Shipping
A Repair Authorizaon (RA) Number must be obtained from Pyxis Technical Support before any product can
be returned to the factory. Pyxis will pay freight charges to ship replacement or repaired products to the
customer. The customer shall pay freight charges for returning products to Pyxis. Any product returned to
the factory without an RA number will be returned to the customer. To receive an RMA you can generate a
request on our website at hps://pyxis-lab.com/request-tech-support/.
Pyxis Technical Support
Contact Pyxis Technical Support at [phone], [email protected], or by lling out a request for
support at hps://pyxis-lab.com/request-tech-support/.
SP-600 User Manual [email protected] | [phone]

1 Introducon
The Pyxis SP-600 is a uniquely designed handheld mulmeter that measures seven key parameters. It is a
cuvee-less device. Less than 5 mL water sample is needed to ll either of the two sample cells for proper
measurement. The measurable parameters are:
• Conducvity/Total Dissolved Solids (TDS)
• Resisvity
• DPD Free Chlorine
• Temperature (°C & °F)
• pH
• ORP
1.1 Main Features
The SP-600 includes the following features:
• Combine conducvity, chlorine, and pH/ORP measurement in a single, rugged meter
• 0.05 µS/cm–200 mS/cm conducvity or 10 Ω·cm–30 MΩ·cm resisvity measurement ranges
• Customizable TDS to conducvity rao (default set as 0.67x µS/cm at mid range)
• Wireless and independent use of pH/ORP module
• Modular pH/ORP design with extra-large juncon capacity providing increased service life
• Replaceable baery in pH/ORP module
• Easy replacement of the pH/ORP module without the need to disassemble the main module
• Customizaon and rmware upgrades via wireless connecon to uPyxis® Mobile/Desktop App
• Long baery life with 10,000+ readings
• Self-diagnosis during calibraons
SP-600 User Manual [email protected] | [phone]

2 Specicaons
Item Specicaon*
P/N 50353
Conducvity Range†0.05 µS–200 mS
Conducvity Resoluon ±1% or ±0.02 µS/cm
Total Dissolved Solids (TDS) Range†0.05–135,000 ppm
Total Dissolved Solids (TDS) Resoluon ±1%
Resisvity Range 10 Ω·cm–30 MΩ·cm
Resisvity Resoluon ±1%
DPD Free and Total Chlorine Range 0.02–2.2 ppm
DPD Free and Total Chlorine Resoluon ±0.02
Temperature Range 32–160 °F (0–70 °C)
Temperature Resoluon ±0.2 °F (±0.1 °C)
pH Range†0–14
pH Resoluon ±0.01
ORP Range ±1,500 mV
ORP Resoluon ±1 mV
pH/ORP Module‡Wireless and replaceable
Display Color LCD, visible under direct sunlight
Main Module Power Supply 4 AA alkaline baeries
pH/ORP Module Power Supply 1 ER14250 lithium thionyl chloride baery
Typical Baery Life 10,000 readings
Dimension (L×W×H) 8.19×3.15×1.77 inch (208×80×45 mm)
Weight§1.15 lbs (520 g)
Operaonal Temperature 32–104 °F (0–40 °C)
Storage Temperature -4–140 °F (-10–50 °C)
Enclosure Rang IP67
Regulaon CE
*With Pyxis’s connuous improvement policy, these specicaons are subject to change without
noce.
†With Automac Temperature Compensaon (ATC)
‡Replacement recommended every 9–12 months
§Baeries excluded
3 Unpacking Instrument
Remove the instrument and accessories from the shipping container and inspect each item for any damage
that may have occurred during shipment. It is possible that the pH/ORP Cell Cap Seal can open in shipment,
which may result in pH/ORP Storage Soluon on the outer shell of the device. This will not cause any damage.
Simply wipe down the device with wet cloth and towel dry. Verify that all items listed on the packing slip
are included. If any items are missing or damaged, please contact Pyxis Customer Service at service@pyxis-
lab.com. During shipping and storage aer producon, a sponge weed with the pH/ORP Storage Soluon
is placed in the pH/ORP Cell Cap Seal. This sponge may be removed and discarded. Some pH/ORP Storage
Soluon may dry and form white crystals in the surrounding areas of the sample cells. Please rinse the
sample cells with a water sample before use.
SP-600 User Manual [email protected] | [phone]

3.1 Standard Accessories
• Four (4) AA alkaline baeries
• Bluetooth/USB Adapter for Desktop P/N: MA-NEB
• User Manual available online at www.pyxis-lab.com/support.html
3.2 Oponal Accessories
The following oponal accessories can be ordered from Pyxis Customer Service ([e-mail]) or
Pyxis eStore at hps://pyxis-lab.com/shop/.
Accessory Name P/N
Replacement pH/ORP Module — Bluetooth 50315
Baery for pH/ORP Module 50778
Pyxis pH/ORP Storage Soluon –– 70 mL 63900
Pyxis Carrying Case for SP-600 MA-700
Pyxis 200 mV ORP Calibraon Standard –– 500 mL 57020
Pyxis pH 4-7-10 Calibraon Combinaon Kit –– 500 mL ea 57007
Pyxis 1000µS Conducvity Calibraon Standard –– 500 mL 57008
Pyxis DPD Free Chlorine Powder Pillow 10 mL (100 pk) 57002
Pyxis DPD Total Chlorine Powder Pillow 10 mL (100 pk) 58-1
Pyxis DPD Chlorine Secondary Standard –– 1.0 ppm Soluon –– 125 mL 21039
Pyxis DPD Chlorine Secondary Standard –– 2.0 ppm Soluon –– 125 mL 21040
4 Installaon
4.1 Main Module Baery Installaon
The main module of the SP-600 is powered by four AA alkaline baeries. Typical baery life is 10,000 mea-
surements or 6 months. When the baery capacity is crically low, the SP-600 displays a ”LOW BATTERY”
warning for ve seconds and then automacally turns o.
The SP-600 does not turn itself on automacally aer the new baery installaon. To turn on the SP-600
aer new baery installaon, press the OK key momentarily and release.
The SP-600 has a calendar mer. To prevent the calendar from being reset to the default date and me
(01/01/1970, 00:00:00), install the four new baeries within four minutes aer the old baeries are re-
moved from the baery compartment. The SP-600 date and me is synchronized automacally when con-
nected with uPyxis® Mobile or Desktop App.
The SP-600 baery compartment, shown in Figure 1, is on the back side of the instrument. Baeries are
held in place by a cover secured with two Phillips-head screws.
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Figure 1. The SP-600 baery compartment
Use the following procedure to install new baeries:
1. Remove the baery compartment cover by loosening the two screws.
2. Remove the old baeries and dispose of them properly.
3. Following the posive and negave terminal signs in the compartment boom, snap four new AA
alkaline baeries rmly into the baery holder.
4. Replace the baery compartment cover and ensure that the sealing O-ring is lying at on the baery
holder.
5. Fasten the two screws.
*NOTE*Failure to properly seat the O-ring may result in water damage to the SP-600.
4.2 pH/ORP Module Baery Installaon
The new pH/ORP module has a lithium thionyl chloride baery (3.7V-ER14250) installed. When the bat-
tery capacity is crically low and the main module displays a LOW BATTERY warning, replace the ER14250
baery. Use the following procedure to install a new baery:
1. Unsnap the pH/ORP module from the top of the main module.
2. Remove the baery compartment cover by using a coin or at-head screwdriver to turn the cover
counterclockwise.
3. Remove the old baery and dispose of it properly.
4. Following the orientaon of the baery as shown in Figure 2, put a new ER14250 baery into the
compartment.
5. Fasten the compartment cover by turning it clockwise.
6. Snap the pH/ORP module back atop the main module.
*NOTE*Failure to properly fasten the cover may result in baery short-circuit and damage.
SP-600 User Manual [email protected] | [phone]

Figure 2. Proper orientaon of the ER14250 baery
5 Instrument Overview
Figure 3.
SP-600 User Manual [email protected] | [phone]

5.1 pH/ORP Cell Cap Seal
When the SP-600 is in storage, the pH/ORP Cell Cap Seal seals the pH/ORP cell, maintaining a moist envi-
ronment for the electrodes. For vigorous eld use, it is recommended to ulize a rubber-band to secure
the pH/ORP Cell Cap Seal to prevent loss of pH/ORP Storage Soluon.
The sponge soaked with the pH/ORP Storage Soluon in the pH/ORP Cell Cap Seal helps prolong the life
of the pH/ORP module. It may be discarded if desired, but pH/ORP Storage Soluon must be maintained
in the unit cell at all mes during non-use. Please ll the pH/ORP cell with 1 mL of Pyxis pH/ORP Storage
Soluon (P/N: 63900) at all mes when not using the pH/ORP cell.
Figure 4. pH/ORP Cell Cap Seal in the open posion
5.2 Control Keys
The SP-600 has three control keys, as shown in Figure 3. The le ( ), right ( ), and ok ( ) keys
are used to launch acons indicated on the LCD display directly above the keys. The labels above the keys
indicate the funcon associated with each key and funcons can be changed in dierent operaon modes.
*NOTE*The LCD display is not a touch-enabled device.
Figure 5.
SP-600 User Manual [email protected] | [phone]

5.3 Main Module On/O
To turn on the SP-600: Press momentarily and release.
To turn o the SP-600: Press and hold for about three seconds. Release when the LCD display
turns o. The SP-600 turns itself o aer 30 seconds without user interacon detected. This is done to
conserve baery life.
*NOTE*This auto-me o seng may be customized by the user as desired through the
uPyxis® Mobile or Desktop App.
5.4 pH/ORP Module On/O
The pH/ORP module has a built-in Bluetooth chip. It can be turned on by the main SP-600 module via
Bluetooth communicaon. The pH/ORP module will turn itself o when either commanded by the main
module or automacally based on the idle me limit when main module is not in pH/ORP measurement
mode.
6 Measurement
6.1 Switch Measurement Mode
The SP-600 has two major measurement modes: Conducvity mode (includes TDS, resisvity, and DPD free
and total chlorine) and pH/ORP mode. The le ( ) and right ( ) keys are used to switch between the
modes.
When powered on, the SP-600 defaults to Conducvity mode (Figure 6). ”Conducvity”, ”Temp”, and their
measurement readings are in bold, while ”pH” and ”ORP” are in gray and their measurement values show
”--”. While in Conducvity mode, press Cond ( ) to launch a selecon menu (Figure 7). Press Cond (
) as needed to switch the device to alternate measurement opons, then press to start the related
measurement selected.
To switch from Conducvity mode to pH/ORP mode, press pH/ORP ( ). ”pH”, ”ORP”, and their mea-
surement readings will become bold, while ”Conducvity”, ”Temp”, and their measurement readings will
become gray (Figure 8). While in pH/ORP mode, press Cond ( ) to switch back to Conducvity mode.
Figure 6. Conducvity mode Figure 7. Cond alternate selec-
on menu
Figure 8. pH/ORP mode
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6.2 Conducvity Measurement
6.2.1 Measurement Procedure
When powered on, the SP-600 will default to the Conducvity mode. If the SP-600 does not default start in
this mode, follow the instrucons in the Switch Measurement Mode secon to switch back to Conducvity
mode. A water sample should be transferred to the conducvity cell using a disposable pipee, or the cells
can be lled slowly from a sample bole.
*NOTE*Special care should be taken when pouring the sample into the cell to avoid air
bubble entrainment, which can interfere with reading accuracy.
Before beginning a measurement, use the sample water to rinse the cell at least three mes. Allow 5–10 seconds
for the SP-600 to reach stabilize (Figure 6).
*NOTE*The me required to reach a stable reading may be slightly longer if the water
sample temperature is signicantly dierent than the environmental temperature at which
the SP-600 had been equilibrated (stored).
6.2.2 Temperature Compensaon
The displayed conducvity value is automacally compensated to the nominal value at the reference tem-
perature 25 °C using the sample temperature measured. The commonly used linear correcon equaon is
used:
Conductivity at 25 °C=Conductivity at Tmeasured
1+0.02(Tmeasured –25) (1)
where Tmeasured is the sample temperature in °C. The default value of conducvity temperature compen-
sang factor is 0.02 which means 2% per °C. This factor can be changed to be to any value between 0.00
%/°C – 9.99 %/°C via the uPyxis® App. Changing the factor to 0.00 %/°C will disable the temperature com-
pensaon.
6.3 Total Dissolved Solids (TDS) Measurement
The conversion rao of TDS to conducvity is automacally compensated to the nominal value at the ref-
erence temperature 25 °C and is based on empirical industry standards. This rao is pre-programmed into
the SP-600 as the default value. The following table lists the default TDS rao readings for four typical
conducvity soluons:
Conducvity TDS
50 µS/cm 31 ppm
500 µS/cm 336 ppm
5,000 µS/cm 4,041 ppm
50 mS/cm 57.09 ppt
SP-600 User Manual [email protected] | [phone]

6.3.1 Measurement Procedure
Follow the steps below to measure the TDS:
1. Press Cond ( ) to switch the measurement mode to Conducvity mode.
2. Press Cond ( ) as needed to highlight TDS in the selecon menu (Figure 9).
3. Press to start TDS measurement.
4. TDS values will be displayed in the same area the conducvity reading was previously displayed (Fig-
ure 10).
*NOTE*The TDS measurement will connue to be displayed unl the user switches to an
alternate measurement mode or conducts a power cycle of the SP-600.
Figure 9. Highlight TDS measurement Figure 10. TDS measurement
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6.3.2 TDS to Conducvity Rao Adjustment
The SP-600 allows the user to set a custom TDS to conducvity conversion rao within the range of 0.125
to 5. This rao will be in eect in the full TDS measurement range when user checks the User TDS Rao
box in the uPyxis® App as shown in Figure 11.
Figure 11. Seng User TDS Rao in uPyxis® Mobile App
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6.4 Resisvity Measurement
Resisvity is the reciprocal of conducvity, which is automacally compensated to the nominal value at the
reference temperature 25 °C. Follow the steps below to measure the resisvity:
1. Press Cond ( ) to switch the measurement mode to Conducvity mode.
2. Press Cond ( ) as needed to highlight RES in the selecon menu (Figure 12).
3. Press to start resisvity measurement.
4. Resisvity values will be displayed in the same area the conducvity reading was previously displayed
(Figure 13).
*NOTE*The resisvity measurement will connue to be displayed unl the user switches
to an alternate measurement mode or conducts a power cycle of the SP-600.
Figure 12. Highlight RES (resisvity) measurement Figure 13. Resisvity measurement
6.5 DPD Free and Total Chlorine Measurement
The SP-600 free and total chlorine methods are based on the USEPA-accepted N, N-diethyl-p-phenylenediamine
(DPD) chemistry. The free chlorine (CL-F) powder pillow reagent and total chlorine (CL-T) powder pillow
reagent dissolve and react with free chlorine and total chlorine in the water sample to form a pink soluon.
The SP-600 measures the absorbance value of the resulted pink soluon to determine the free chlorine and
total chlorine concentraon as DPD.
*NOTE*Both Pyxis Lab DPD or HACH DPD 10 mL free and total chlorine reagent powder
pillows may be used for this test method.
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Follow the steps below to measure free and total chlorine:
1. Press Cond ( ) to switch the measurement mode to Conducvity mode.
2. Press Cond ( ) as needed to highlight Chlorine in the selecon menu.
3. Press to launch the CHLORINE MEASUREMENT screen (Figure 14).
4. Long press Zero ( ) to select either the free chlorine or total chlorine method.
5. Press Method ( ) as needed to highlight either CL-F for free chlorine or CL-T for total chlorine in
the selecon menu (Figure 15).
Figure 14. CHLORINE MEASUREMENT screen Figure 15. Select chlorine measurement method
6. Press to select the chlorine method.
7. Rinse the conducvity/chlorine sample cell three mes with the sample to be tested. Fill the sample
cell with the sample.
8. Press Zero ( ). ZERO will then appear on the top-le corner of the display.
9. Prepare the developed sample:
(a) Add 10 mL of the sample water into the 10 mL sample vial provided.
(b) Add one free chlorine or total chlorine powder pillow to the 10 mL sample vial (Figure 17).
(c) Cap the 10 mL sample vial and invert several mes to fully mix the reagent and sample.
(d) The developed sample should be pink if either species of chlorine is present in the sample.
10. Use a poron of the developed sample to rinse the conducvity/chlorine sample cell once. Fill the
sample cell with the remaining developed sample (Figure 18).
11. Press Timer ( ). A 1-minute mer for free chlorine or 3-minute mer for total chlorine will begin.
12. The SP-600 will connuously display the free or total chlorine concentraon as the mer counts down.
Record the nal value aer mer stops.
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Figure 16. Pyxis’s free and total
chlorine powder pillows
Figure 17. Add DPD powder to
sample
Figure 18. Fill sample cell with
developed sample
6.6 Temperature Measurement
The SP-600 has two planum RTD’s (Resistance Temperature Detectors), one located in the conducvity cell
and one in the pH/ORP cell. These temperature sensors are individually calibrated in the Pyxis factory and
do not need to be calibrated during use. The temperature values measured are used in the conducvity
temperature compensaon and in converng the measured cell potenal to the pH value of the sample
temperature. The temperature on the display is obtained from the conducvity cell RTD.
6.7 pH/ORP Measurement
6.7.1 Measurement Procedure
Please use the following steps to measure pH and ORP:
1. Press pH/ORP ( ) to switch to the pH/ORP measurement mode. This will automacally power on
the pH/ORP module. The indicator light of the module will be green and ashing when powered
on. The main module of the SP-600 will automacally connect aer the pH/ORP module has been
powered up.
2. Once connected, the background color of pH indicator on top-right corner of the display will change
from gray to blue and the indicator light on the pH/ORP module itself will be change from green to
blue and ashing. The prompt message is also changed from Connecng... to Measuring... .
3. Once the measurements are completed, the values will be displayed and the prompt message will
disappear.
4. Rinse the pH/ORP sample cell three mes with the sample to be tested. Fill the sample cell with the
sample.
5. The pH and ORP values will be updated every two seconds on the SP-600 main module display. The
values will be displayed in white with a blue background once a stable value is reached (Figure 19).
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Figure 19. Display pH and ORP values
6.7.2 Erroneous Values
An erroneous pH value could be obtained if the module has been stored dry without the protecon of
pH/ORP Storage Soluon for a long period of me. In this case, please ll the module cell with pH/ORP
Storage Soluon to wet the electrode and allow it to soak for 30 minutes before use. If the pH/ORP Storage
Soluon is not available, please use the sample water to hydrate the electrode for at least 30 minutes.
6.7.3 pH Measurement Principle
The SP-600 pH/ORP module uses the standard electrochemical cell for the pH measurement. The cell con-
sists of a glass electrode and an Ag/AgCl reference electrode. Potassium chloride (KCl) electrolyte lling gel
is sealed in the Ag/AgCl electrode. The amount of reference electrolyte in the pH/ORP module is signi-
cantly larger than that used in a common laboratory pH electrode. This reduces the chance of the lling
soluon being diluted or contaminated and increases the electrode life.
The pH value is calculated from the measured cell potenal (EM F in mV):
pH =EMF
S(T) + pHo
(2)
S(T) = 0.1986(T+ 273.15) (3)
S(T)in the above equaon is the calibraon slope, where Tis temperature in degrees Celsius. S(T)has
a theorecal value of 59.17 mV at 25 °C. pHois the calibraon intercept. The calibraon slope, S(T), at
the nominal temperature 25 °C and the intercept, pHo, are determined in the two-point or three-point
calibraon procedure. pHois determined as well in the singe-point pH 7.00 calibraon. The temperature
value measured by the pH/ORP module is used in the above equaon to calculate the pH value at the sample
temperature.
*NOTE*The temperature compensaon involved in the pH value calculaon is quite dif-
ferent from that in the conducvity measurement. The temperature-compensated conduc-
vity value is a would-be value at the reference temperature 25 °C, while the pH value
displayed by the SP-600 is the true pH value at the sample temperature.
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6.7.4 ORP Measurement Principle
The SP-600 measures the sample ORP with the planum electrode and the Ag/AgCl reference electrode in
the pH/ORP cell. The pH measurement and the ORP measurement share the same reference electrode.
Reporng an ORP value without specifying the reference scale has no meaning. The value displayed by
the SP-600 depends on the ORP value of the ORP standard used in the calibraon. If the ORP value of the
standard is referenced to the Standard Hydrogen Electrode (SHE), the ORP value reported by the SP-600 is
SHE-based, i.e., in the unit of Eh. If the ORP value of the standard is referenced to the Ag/AgCl (3M KCl)
electrode, the ORP value reported by the SP-600 is referenced to the same, commonly noted as (Ag/AgCl,
3M KCl).
The ORP electrode is calibrated using the Zobell’s standard using the value of 221 mV at 25 °C before ship-
ping. The default ORP scale of the SP-600 before a user calibraon is the Ag/AgCl (3M KCl). If the SP-600
is exposed to an extremely high (> +600 mV) or extremely low (< -200 mV) ORP sample, rinsing the pH/ORP
cell excessively when switching to measure a lower or higher redox buer capacity sample is necessary.
The dissolved oxygen in the sample can contribute to the ORP value measured. To measure a sample that
has not be equilibrated with the ambient air, a slow and small upward driing to more posive ORP value
is normal. For a typical cooling water sample treated with oxidizing biocides, a ±20 mV accuracy and ±10
mV precision can be expected.
7 Calibraon
7.1 Conducvity Calibraon
The conducvity and pH/ORP measurements can be calibrated separately using the corresponding stan-
dards.
7.1.1 Calibraon Recommendaon
A standard with conducvity value 10, 100, 7,000, or 50,000 µS can be used to calibrate conducvity. The
following table lists the recommended standard to calibrate the SP-600 according to the measurement
range. Oponally, the user can use a standard with any conducvity value in the range of 800 to 7,000 µS,
such as the commonly used 1,412 (or 1,413) µS standard, to calibrate the SP-600.
Measurement Range Recommended Standard
0–60 µS 10 µS
60–500 µS 100 µS
500–10,000 µS 7,000 µS
10,000–200,000 µS 50,000 µS
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7.1.2 Standard Calibraon (10, 100, 7,000, or 50,000 µS)
1. Rinse the conducvity sample cell three mes with the desired conducvity standard. Fill the sample
cell with the standard.
2. Power on the SP-600 by pressing . Allow 5–10 seconds for the SP-600 to stabilize (Figure 20).
3. Press Cal/Sys ( ) to launch the DEVICE INFORMATION screen.
4. Press Calib ( ) as needed to highlight Cond (conducvity) calibraon in the selecon menu (Figure
21).
5. Press to launch the CONDUCTIVITY CALIBRATION screen.
6. Use and to cycle to the desired calibraon, for example, 100 µS (Figure 22). The standard
conducvity selecons are 10, 100, 5,000, and 50,000 µS.
*NOTE*To exit the calibraon procedure enrely, long press Calib ( )
7. Press Calib ( ) to conrm the specic conducvity calibraon desired.
8. The display updates as shown in Figure 23 and the user can choose one of three opons:
(a) Press to start the calibraon, or
(b) Press Cancel ( ) to return to the CONDUCTIVITY CALIBRATION screen, or
(c) Press Exit ( ) to abandon calibraon enrely.
9. Once calibraon begins, the SP-600 reads the sample and displays the value in the Measured secon.
A slight variance from the target is acceptable.
10. The message “Calibraon Success” will appear towards the boom of the display (Figure 24).
11. Calibraon is now complete, long press Calib ( ) to return to Conducvity mode (Figure 25).
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