Pyxis SP-700 User manual

SP-700 Water Multimeter
Operation Manual
March 10, 2018
Rev. C
US Patent: 9612221
Pyxis Lab, Inc.
1729 Majestic Dr. Suite 5
Lafayette, CO 80026 USA
www.pyxis-lab.com
© 2017 Pyxis Lab, Inc.
Pyxis Lab Proprietary and Confidential

The information contained in this manual may be confidential and proprietary and is the property of Pyxis Lab, Inc.
Information disclosed herein shall not be used to manufacture, construct, or otherwise reproduce the goods
described. Information disclosed herein shall not be disclosed to others or made public in any manner without the
express written consent of Pyxis Lab, Inc.
Limited Warranty
Pyxis Lab warrants its products for defects in materials and workmanship. Pyxis Lab will, at its option, repair or
replace instrument components that prove to be defective with new or remanufactured components (i.e.,
equivalent to new). The warranty set forth is exclusive and no other warranty, whether written 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 dysfunctional instruments may be returned to Pyxis for repair or replacement. In some instances,
replacement instruments may be available for short duration loan or lease.
Pyxis warrants that any labor services provided shall conform to the reasonable standards of technical competency
and performance effective at the time of delivery. All service interventions are to be reviewed and authorized as
correct and complete at the completion of the service by a customer representative, or designate. Pyxis warrants
these services for 30 days after the authorization and will correct any qualifying deficiency in labor provided that
the labor service deficiency is exactly related to the originating event. No other remedy, other than the provision
of labor services, may be applicable.
Repair components (parts and materials), but not consumables, provided in the course of a repair, or purchased
individually, are warranted for 90 days ex-works for materials and workmanship. In no event will the incorporation
of a warranted repair component into an instrument extend the whole instrument’s warranty beyond its original
term.
Warranty Shipping
A Repair Authorization Number (RA) 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.
Pyxis Technical Support
Contact Pyxis Technical Support at [e-mail].

Pyxis SP-700 Multimeter Operation Manual 3
Table of Contents
1Introducing the Pyxis SP-700 Multimeter.....................................................................................4
1.1 Features of the Pyxis SP-700 Multimeter .....................................................................................4
1.2 Specifications ................................................................................................................................5
1.3 Unpacking the Pyxis SP-700 Multimeter.......................................................................................5
1.4 Standard accessories.....................................................................................................................5
1.5 Optional accessories .....................................................................................................................6
1.6 Dual function light shield ..............................................................................................................6
2Using the Pyxis SP-700................................................................................................................7
2.1 Battery installation........................................................................................................................7
2.2 Using the SP-700 control keys.......................................................................................................8
2.3 Turning the SP-700 on and off ......................................................................................................9
3Multiple parameter measurement ..............................................................................................9
3.1 Measurement................................................................................................................................9
3.2 Temperature measurement..........................................................................................................9
3.3 Conductivity temperature compensation...................................................................................10
3.4 High color and turbidity warning ................................................................................................10
3.5 pH measurement ........................................................................................................................10
3.6 ORP measurement......................................................................................................................11
4Calibrating the SP-700...............................................................................................................11
4.1 PTSA standalone calibration (2 point with zero) ........................................................................12
4.2 Conductivity Calibration..............................................................................................................15
4.2.1 Combined calibration procedure........................................................................................15
4.2.2 Standard conductivity calibration (500, 1000, 2500, or 5000 µS) ......................................17
4.2.3 User-defined conductivity calibration procedure...............................................................20
5pH and ORP calibrations ...........................................................................................................23
5.1 pH electrode calibration .............................................................................................................23
5.1.1 One-point calibration..........................................................................................................23
5.1.2 Second-point calibration.....................................................................................................24
5.1.3 Third-point calibration ........................................................................................................25
5.2 ORP calibration ...........................................................................................................................26
6Device information and diagnosis .............................................................................................27
7Device maintenance & cleaning ................................................................................................28
8Replacing the pH and ORP module (Hardware before SN: 170000).............................................30
9Replacing the pH and ORP module (Hardware after SN: 170000)................................................31
10 Bluetooth connection ...............................................................................................................33
11 Calibrate ST-500 with SP-700 ....................................................................................................34
12 REGULATORY APPROVAL ..........................................................................................................36

Introducing the Pyxis SP-700 Multimeter
Pyxis SP-700 Multimeter Operation Manual 4
1Introducing the Pyxis SP-700 Multimeter
The Pyxis SP-700 is a handheld multimeter that measures simultaneously five key parameters in
a water sample:
•pH
•Conductivity
•PTSA (Pyrene Tetrasulfonic acid tetra sodium salt)
The PTSA measurement uses custom signal processing algorithms to compensate for sample
color and turbidity conditions that can cause erroneous readings.
•ORP
•Temperature
•Free Chlorine –TMB Method (Separate Instructions Document Available from Pyxis)
The SP-700 is a cuvette-less device and has two sample cells. Less than 5 ml water sample is
needed to fill the cells for measurement of the five parameters.
1.1 Features of the Pyxis SP-700 Multimeter
The SP-700 includes the following features:
•Breakthrough technology combining PTSA with conductivity / pH and ORP in a single rugged
one-handed meter. Free Chlorine TMB Method function also included in Color Mode.
•Custom pH/ORP modular design with extra-large junction capacity providing increased
service life.
•Easy replacement of the pH/ORP electrode module without the need to open the meter
enclosure.
•Long battery life: 10,000+ readings.
•Self-diagnosis during calibrations.
•Custom product names and tracer/product ratios configurable via Bluetooth-enabled
devices.

Introducing the Pyxis SP-700 Multimeter
Pyxis SP-700 Multimeter Operation Manual 5
1.2 Specifications
Specifications are subject to change without notice. Contact Pyxis ([email protected]) for an updated specification list.
Item
Specification
Analysis
PTSA
0-300 ppb, ±1 ppb or 1% precision
Conductivity
1-15,000 µS/cm with ATC. ±1% or ±1 µS/cm precision
pH
0-14 with ATC, ±0.01 pH unit precision
ORP
±1500 mV, ±1 mV precision
Temperature
0-70° C (32-160° F), ±0.1° C (±0.2° F)
Free Chlorine
0 –2.2ppm (TMB Method –Ask For Separate Instructions)
Storage Temperature
-20° C - 60° C (-4 - 140° F)
Operational Temperature
0° C - 40° C (32 - 104° F)
Sensor Module
pH/ORP, replaceable
Typical Sensor Life
pH/ORP - 2 years
PTSA/Conductivity - 5 years
Protection Grade
IP67, full dustproof and waterproof
Regulation
CE
Display
Color LCD, visible under direct sunlight
Power Supply
4 AA alkaline batteries
Typical Battery Life
10,000 readings
Dimension (L x W x H)
180 x 80 x 32.6 mm (7.06 x 3.15 x 1.30 inches)
Weight
380 g (0.85 lbs), batteries excluded
1.3 Unpacking the Pyxis SP-700 Multimeter
Remove the instrument and accessories from the shipping container and inspect each item for
any damage that may have occurred during shipping. Verify that all items listed on the packing
slip are included. If any items are missing or damaged, please contact Pyxis Customer Service at
[e-mail].
During shipping and storage after production, a sponge wetted with the KCl based pH storage
solution is placed in the pH/ORP cell. Some storage solution may dry out, leaving white
potassium chloride crystals in the surrounding areas of the cell. Please rinse the cell with DI
before use.
1.4 Standard accessories
The following accessories are included in the SP-700 package:
•Four (4) AA alkaline batteries
•Bluetooth USB adapter
The full instrument manual is available for download at www.pyxis-lab.com/support.html

Introducing the Pyxis SP-700 Multimeter
Pyxis SP-700 Multimeter Operation Manual 6
1.5 Optional accessories
The following optional accessories can be ordered from Pyxis Customer Service,
[e-mail]:
Accessory
Item number
Carrying case for SP-700
MA-700
100 ppb PTSA + 1000 S/cm (KCl) combined
standard
MA-1010C
220 mV ORP calibration standard
ORP-220
100 ppb PTSA calibration standard
PTSA-100
200 ppb PTSA calibration standard
PTSA-200
300 ppb PTSA calibration standard
PTSA-300
1.6 Dual function light shield
The SP-700 light shield (figure 1) has two functions:
•It shields ambient light from potentially interfering with PTSA measurement.
•When the multimeter in storage, the rubber gasket on the side of the light shield facing the
pH/ORP cell seals the cell, maintaining a moisture environment for the electrodes.
Figure 1. Light shield in the open position
If the meter is to be stored for more than two weeks, fill the pH/ORP cell with 0.5 ml of the pH 4
buffer solution or any pH electrode storage solution. The sponge wetted with the pH storage
solution in the pH/ORP cell is needed only for long-term storage.

Using the Pyxis SP-700
Pyxis SP-700 Multimeter Operation Manual 7
2Using the Pyxis SP-700
2.1 Battery installation
The SP-700 is powered by four AA alkaline batteries. Typical battery life after replacing a new
battery set is 10,000 measurements, or 10 months. When the battery capacity is critically low,
the SP-700 displays a LOW BATTERY warning for five seconds, and then automatically turns off.
Note: Do not use rechargeable nickel cadmium (NiCad) or lithium batteries in the SP-700. Use
only alkaline batteries.
Replace the batteries to resume operation after a low battery warning. The SP-700 does not
turn itself on automatically after the new battery installation. To turn the SP-700 back on after
new battery installation, press the OK key for one second.
Maintaining SP-700 date and time during battery installation: The SP-700 has a calendar
timer. To prevent the calendar from being reset to the default date and time (01/01/1970,
00:00:00), install the four new batteries within four minutes after the old batteries are removed
from the battery compartment.
The SP-700 date and time is synchronized with your PC automatically when connected with
uPyxis app via Bluetooth adapter.
The SP-700 battery compartment, shown in Figure 2, is on the back side of the instrument.
Batteries are held in place by a cover secured with four Phillips-head screws.
Figure 2. The SP-700 battery compartment

Using the Pyxis SP-700
Pyxis SP-700 Multimeter Operation Manual 8
Use the following procedure to install new batteries:
1.
2. Remove the battery compartment cover by loosening the four screws.
3. Gently remove the old batteries and dispose of properly.
4. Following the positive and negative signs in the compartment bottom, snap four new AA
alkaline batteries firmly into the battery holder.
5. Replace the battery compartment cover and ensure that the sealing O-ring is lying flat on
the battery holder. Note that failure to properly seat the O-ring may result in water damage
to the meter.
6. Fasten the four screws.
2.2 Using the SP-700 control keys
The SP-700 has three control keys, as shown in Figure 3. The left ( < ), right ( > ), and OK keys are
used to launch an action indicated on the LCD screen directly above the keys. Note that the LCD
screen is not a touch-enabled device; the labels above the keys indicate the function associated
with the keys, and functions can be changed in different operation modes.
Figure 3. Control keys and associated functions

Multiple parameter measurement
Pyxis SP-700 Multimeter Operation Manual 9
2.3 Turning the SP-700 on and off
To turn on the SP-700:Press the OK control key momentarily and release.
To turn off the SP-700:Press and hold the OK key for three seconds. Release the OK key when
the LCD display turns off.
The SP-700 turns itself off after 60 seconds without user interaction.
3Multiple parameter measurement
3.1 Measurement
When powered on, the SP-700 is in Measurement mode (as shown in Figure 3, above).
A water sample can be transferred to the measurement cells using a pipette, or the cells can be
filled directly from a sample bottle.
Rinse cells before measurement. Before beginning a measurement, use some of the sample
water to rinse the cells at least three times. Rinsing the surface between and around the cells
helps reduce cross-contamination when measuring multiple samples, especially when switching
to a sample with conductivity/pH/ORP significantly different than the previous sample.
Using the light shield. To measure PTSA, the light shield should be in the closed position. If you
are not making a fluorescence measurement, you can leave the light shield in the open position
without affecting the reading and accuracy of conductivity, pH, or ORP.
Allow five seconds for the SP-700 to reach stable readings for the six parameters. The time
required to reach a stable reading may be slightly longer if the water sample temperature is
significantly different than the environmental temperature at which the SP-700 had been
equilibrated (stored).
For a sample with conductivity in the range of 100 to 6000 S/cm, the measured conductivity
value should be stabilized in the range of 98–102 to 5940–6060 S/cm, respectively. For a
sample containing 100 ppb PTSA, the measured PTSA should be stabilized within the range of
98–102 ppb.
3.2 Temperature measurement
The SP-700 has a 100platinum RTD located in the PTSA/Conductivity cell. The temperature
sensor is individually calibrated in the factory and does not need to be calibrated during use. The
temperature value measured is used in the conductivity temperature compensation calculation
and in converting the measured cell potential to the pH value at the sample temperature.

Multiple parameter measurement
Pyxis SP-700 Multimeter Operation Manual 10
Note that the pH/ORP cell does not have a temperature sensor. You must fill the
PTSA/conductivity cell to measure the sample temperature. If the PTSA/conductivity cell is dry
and empty, the temperature value used in the pH calculation is the ambient environmental
temperature, which may be different from the sample temperature.
3.3 Conductivity temperature compensation
The displayed conductivity value is automatically corrected to the nominal value at the
reference temperature 25.0° C using the sample temperature measured. The commonly used
linear correction equation is used:
Conductivity at 25° C = (Conductivity at Tmeasure) / [1 + 0.02(Tmeasure –25)]
where Tmeasure is the sample temperature in degrees Celsius.
3.4 High color and turbidity warning
The SP-700 has extra channels to measure sample turbidity and color to automatically
compensate for sample color and turbidity interference. If sample turbidity and color values
determined are too high and beyond the compensation range, a PTSA measurement warning is
displayed. In this case, you should filter or dilute the sample for PTSA measurement.
3.5 pH measurement
The SP-700 uses the standard electrochemical cell for the pH measurement. The cell consists of
a glass electrode and an Ag/AgCl reference electrode. Potassium chloride (KCl) electrolyte filling
gel is sealed in the Ag/AgCl electrode.
The amount of reference electrolyte in the SP-700 is significantly larger than that used in a
common laboratory pH electrode. This reduces the chance of the filling solution being diluted or
contaminated and increases the electrode life.
The pH value is calculated from the measured cell potential (EMF):
pH = EMF / S(T) + pHo
S(T) in the above equation is the calibration slope and is theoretically equal to:
0.1986(T + 273.15),
where T is temperature in degrees Celsius.
S(T) has a theoretical value of 59.17 mV at 25o C. pHois the calibration intercept. The calibration
slope S(T) at the nominal temperature 25.00o C and the intercept pHoare determined in the
two-point or three-point calibration procedure. pHois determined as well in the singe-point pH
7.00 calibration.