Mesalabs 90XL User manual

90XL™ Meter
User’s Guide
Part No. 901120027 Rev H
© 2018 Mesa Laboratories, Inc. All Rights Reserved

This Page Intentionally Left Blank

Table of Contents
I. DESCRIPTION ..................................................................................................................4
II. INDICATIONS FOR USE ...................................................................................................4
III. SAFETY INFORMATION ...................................................................................................5
IV. GENERAL OVERVIEW......................................................................................................6
V. FEATURES, COMPONENTS, AND CONTROLS ..............................................................7
A. Display Module Holder and IV Pole Holder..................................................................8
B. Key and Symbol Descriptions ......................................................................................9
C. 90XL Screen Flow Diagram .......................................................................................10
D. 90XL Display Screens................................................................................................11
1. MAIN Screen Overview ...................................................................................11
2. MENU Screen Overview..................................................................................12
VI. OPERATINGINSTRUCTIONS.........................................................................................13
A. General ......................................................................................................................13
B. How to Connect / Disconnect a Sensor Module.........................................................14
C. Meter Configuration ...................................................................................................15
D. Changing the Units of Measure..................................................................................16
E. How to Take Measurements ......................................................................................18
1. Conductivity and Temperature Measurements ................................................18
2. pH Measurements ...........................................................................................18
3. How to Take Pressure Measurements .............................................................19
F. How to Verify Sensor Module Calibrations..................................................................21
1. 90XL Conductivity/Temperature Sensor Module .............................................21
2. 90XL pH Sensor Module..................................................................................23
3. 90XL Pressure Calibration Verification ............................................................24
G. Timer Function ...........................................................................................................25
VII. CALIBRATION INSTRUCTIONS .....................................................................................26
A. General Information ...................................................................................................26
B. Resetting Factory Defaults (Applies to all module types)...........................................26
C. How to calibrate the conductivity/temperature sensor module...................................27
1. Low Range Conductivity Calibration................................................................28
2. Mid-Range (Standard) Conductivity Calibration...............................................29
3. High-Range Conductivity Calibration...............................................................31
D. How to Calibrate the pH Sensor Module....................................................................33
E. How to Calibrate the Pressure Sensor Module ..........................................................35
VIII. CLEANING, DISINFECTION, AND STORAGE ...............................................................36
IX. BATTERY INFORMATION ..............................................................................................37
X. 90XL ACCESSORIES......................................................................................................38
XI. TROUBLESHOOTING.....................................................................................................40
XII. USER ASSISTANCE AND FACTORY SERVICE ............................................................41
XIII. 90XL SPECIFICATIONS..................................................................................................42
XIV. LIMITED WARRANTY .....................................................................................................43

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I. DESCRIPTION
The 90XL meter is designed to be used by hemodialysis professionals to measure and display
readings of conductivity, temperature, pH, and pressure of the dialysate fluids used in
hemodialysis delivery systems.
The display module includes the LCD display as well as the user interface. It is used in
conjunction with specific measurement sensor modules that contain the appropriate sensor for
the desired measurement. The following sensor modules are currently available:
• Conductivity / temperature
• pH
• Pressure (Gauge or differential)
The multichannel LCD screen allows the display of up to 4 simultaneous readings from any
combination of sensor modules.
The 90XL timer function allows routine event timing.
NOTE: Throughout this User’s Guide, the terms 90XL Instrumentation system and 90XL meter
are equivalent descriptors for this device.
II. INDICATIONS FOR USE
The 90XL instrumentation system is intended for use by hemodialysis professionals to measure
the conductivity, temperature, pH, and pressure of the dialysate solution associated with
hemodialysis delivery systems. Water purification specialists may also use the 90XL meter to
verify proper characteristics of the water used in hemodialysis. These parameters are key
indicators of system performance that require periodic monitoring and adjusting to maintain safe
and effective hemodialysis systems.

5
III. SAFETY INFORMATION
WARNINGS AND CAUTIONS
WARNING: The 90XL Display Module and its attached sensor modules should never be used
without first verifying accuracy of measurement functions. Using the device without verifying
accurate function could result in improper calibration of the dialysis delivery system. An
improperly calibrated dialysis delivery system could result in compromised dialysis treatment(s)
and/or patient injury.
Mesa Labs recommends verifying sensor module calibration using National Institute of
Standards and Technology (N.I.S.T.) traceable reference standards before use or whenever
inaccurate readings are suspected.
WARNING: The device is not suitable for use in a potentially explosive environment. The
device cannot be used inside an oxygen tent.
CAUTION: Use only sodium chloride (NaCl) standard solution. The conductivity/temperature
sensor module is temperature-compensated for NaCl solution. Other solutions, such as
potassium chloride (KCl), may result in an inaccurate calibration.
CAUTION: DO NOT use the 90XL Instrumentation System in place of the dialysis delivery
system’s primary sensors, controls, and/or monitors.
CAUTION: DO NOT submerse your 90XL display module or the sensor module connector
ends in liquids, as this may result in damage to the instrument and/or the sensor modules.
CAUTION: DO NOT use abrasive cleaning agents and/or full-strength bleach or acid to clean
the display module or sensor modules, as this will cause damage.
CAUTION: DO NOT open the display module or sensor modules. There are no user-
serviceable parts inside and it will void the warranty.
CAUTION: Federal (USA) law restricts this device to sale to or by order of a physician.
CAUTION: Dispose of this device properly.
It should not be disposed of in a landfill.
WARNING: The user can be exposed to the following materials when using this device:
Polyester, Aluminum, Acrylic, Glass, Natural Polypropylene, *Noryl
TM
, Stainless Steel, Santoprene,
Silicone, ABS Plastic, Polycarbonate Plastic, Powder Coat Paint. No latex or latex containing
materials are used in the manufacture of the device.
*Noryl
TM
is a registered trademark of SABIC Innovative Plastics IP B.V.

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IV. GENERAL OVERVIEW
The 90XL meter is a portable, multifunction meter designed to measure the conductivity, pH,
temperature, and pressure of the dialysate fluids associated with hemodialysis delivery systems,
and of the water used in hemodialysis.
The display module houses the electronic circuitry, navigation keys, digital display, and
rechargeable lithium-ion battery. The four navigation keys are labeled by the display according to
context.
The individual sensor modules contain the appropriate sensors and circuitry for measuring the
desired parameter of the dialysate solution or hemodialysis water. The sensor modules attach to
the display module with cables that plug into connectors on the meter. Up to four different sensor
modules may be simultaneously connected to the display module for the desired measurements.
Measurements for conductivity and temperature are taken as the solution flows through the
dialysate lines to which a sensor module is connected. pH measurements may be taken by
using the pH sensor module directly from a container using the dip configuration. For water
purity measurements, a water sample is removed from the water purification system via a valve
and then tested using an appropriate sampling method. The 90XL pressure sensor module can
be used to verify the accuracy of arterial and venous monitors, measure negative pressure and
differential pressure of the delivery system fluid.
In-Line method using adapters
(Condo/temp, Pressure)
Dip sample method for pH
measurement
Sample tray and syringe for
conductivity measurement

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V. FEATURES, COMPONENTS, AND CONTROLS
Sensor module measurements are shown on the display module screen. Using the navigation
keys, the user may access numerous display screens and views to select individual functions,
such as:
Adjust date and time
Adjust screen contrast and brightness
Select units of measure for readings
Obtain detailed information about a
sensor module
Calibrate sensor modules
Restore factory default values
Time events
Access help screens
Select auto-off time
Navigation Keys
LCD
Display
Conductivity/Temp Sensor Module
pH Sensor Module
and probe
Pressure Sensor Module
Sensor Module
Connections

8
A. Display Module Holder and IV Pole Holder
The Display Module is supplied with a protective holder. The holder may be used as a tilt stand
on a flat surface, it may be used with the supplied IV Pole Holder to mount the Display Module
on an IV pole, or the Display Module may be inserted with the LCD and buttons facing inside to
protect it during transport and storage.
Case holder for the Display Module Case holder used as a tilt stand on a flat
surface
Place the Display Module in the case/holder The IV Pole Holder conveniently slips into
with the screen side down as a protector slots in the back of the case/holder

9
B. Key and Symbol Descriptions
SCROLL UP A LIST OF
SELECTIONS, SCROLL UP
ONE LINE IN HELP
START THE TIMER
FUNCTION
SCROLL DOWN A LIST OF
SELECTIONS, SCROLL
DOWN ONE LINE IN HELP
STOP THE TIMER
FUNCTION
SCROLL DOWN AN ENTIRE
PAGE IN HELP
CHANGE THE POSITION OF
THE READINGS IN DUAL
CHANNEL DISPLAY
SELECT THE CHANNEL OF
INTEREST ON THE MAIN
SCREEN
RETURN TO THE
PREVIOUS SCREEN
RETURN TO THE MAIN
SCREEN
PRESS TO MANUALLY
TURN OFF THE SYSTEM
ACESS THE SYSTEM MENU
PRESS TO DISCONITUE OR
RESTART A CALIBRATION
PROCEDURE
RESET THE TIMER
FUNCTION TO ZERO
PRESS TO SAVE A
SETTING UNTIL THE UNIT
IS TURNED OFF
SAVE A SELECTED
PARAMETER
ADVANCE TO THE NEXT
CALIBRATION STEP
SELECT A MENU ITEM

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C. 90XL Screen Flow Diagram

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D. 90XL Display Screens
1. MAIN Screen Overview
The 90XL screen that displays all real-time measurement information is called the MAIN screen.
The MAIN screen can display up to 4 channels of information based on the number and types of
sensor modules that are connected. The readings from all sensor modules are displayed
simultaneously on the one MAIN screen. If you are viewing multiple channels, there may be a
need to select a particular channel for further actions. This may be done by pressing the key
labeled . This will scroll the selection indicator ( ) down one channel for every press of the
key. The scrolling sequence is “CH 1 through CH 4, then back to CH 1…, etc.” Unused channels
on the display are ignored during the scrolling function.
The SWAP function on the MAIN screen is used to swap the dominant and subordinate readings
within a conductivity and temperature channel. Simply select the channel you would like to
change using the key, and press SWAP. (See Figure 1 below)
Fig. 1
The SWAP key has no affect for a single parameter channel.
Channel Select Icon
Units of
M
easure
Channel number (matches the
number connector at the top of
the display module)
Battery Charge Indicator
CH$ (Not in Use)
Key Labels
Dual Channel
Condo + Temp

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2. MENU Screen Overview
The MENU key on the MAIN screen will advance you to the list of channel specific, as well as
system related functions.
NOTE: The selected channel on the MAIN screen continues to be displayed on the MENU
screen. Return immediately to the MAIN screen by pressing the MAIN key.
Scroll with the up/down arrows to highlight a menu item, then select using the “SEL” key.

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VI. OPERATING INSTRUCTIONS
A. General
(a) Turn the 90XL ON…
To turn on the instrument, press the left most key at the bottom of the display. It is marked
with the symbol.
(b) Connect sensor module(s) to the 90XL meter
Select the sensor module or sensor modules that you would like to use and connect
them to the ports at the top of the instrument. The system will sense the type of sensor
module or sensor modules that are connected, and automatically orient the channels on
the display.
(c) Take measurements…
Once the sensor module(s) are connected to 90XL meter, you are ready to take your
measurements.
WARNING: Mesa Labs recommends verifying sensor module calibration using National
Institute of Standards and Technology (N.I.S.T.) traceable reference standards before
taking measurements, or whenever inaccurate readings are suspected.
(d) Turn the 90XL OFF…
The 90XL may be turned off manually by pressing the OFF key at the bottom of the MAIN
screen. Additionally, if an AUTO-OFF (see configuration section) function has been
enabled, the instrument will power down automatically if no key activity is sensed during
the selected time period.

14
B. How to Connect / Disconnect a Sensor Module
To connect a sensor module to the 90XL display module:
1. Turn the display module ON by using the left-most key, labeled with the symbol
2. The sensor module may be connected to any vacant port.
3. Plug the connector into the port until a slight click is felt.
There is a slight pause while the sensor module establishes communication with the
display module. The 90XL will then display the reading on the channel that matches the
sensor module connector.
To disconnect a sensor module from the 90XL Display Module:
Using your fingers, gently pull straight away from the socket to remove the connector
from the port. Do not turn or rotate the cable end. Cover the port with the protective cap
to prevent dirt, dust or fluids from entering the connector.

15
C. Meter Configuration
MENU Screen
Using the arrow keys, move cursor
to select digits and set the time.
Press SAVE to advance to return
to the main configuration screen
NOTE: For Auto-off,
contrast, and brightness
settings; press the
TEMP key to save the
setting for the current
session only. Press the
SAVE key to keep the
setting as a default.
Choose the time interval for
the auto-off feature. Time
selected is the time after
last key action.
(See note below)
Scroll to a Menu
item and press
select
Use the arrow
keys to adjust
display contrast
(See Note at left)
Use the arrow keys
to adjust display
brightness
(See Note at left)
Using the arrow keys, move cursor to
select digits and set the date. Press
SAVE to advance to the time screen
CONFIGURATION Screen
Detailed information
about the selected
sensor module
Select
“CONFIGURATION”

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D. Changing the Units of Measure
Units of measure may be changed for conductivity, temperature, and pressure by using
the following procedures. Once new units of measure have been selected, they will be
retained in the sensor module until changed again by the user.
Conductivity units:
Select the channel displaying
conductivity on the MAIN screen using
the arrow keys.
Make sure that conductivity is the
dominant parameter being displayed
and press MENU. Use the SWAP key to
change the dominant parameter if
necessary.
Select “UNITS OF MEASURE” from the
MENU screen.
Scroll to the units desired using the
arrow keys and press “SEL”. After a brief
pause, the display will return to the
MAIN screen and display the parameter
in the new units.
Temperature units:
Select the channel displaying
temperature on the MAIN screen using
the arrow keys.
Make sure that temperature is the
dominant parameter being displayed (if
not press SWAP) and press MENU.
Select “UNITS OF MEASURE” from the
MENU screen.
Scroll to the units desired using the
arrow keys and press “SEL”. After a brief
pause, the display will return to the
MAIN screen and display the parameter
in the new units.

17
Pressure units:
Select the channel displaying pressure
on the MAIN screen using the arrow
keys.
Select “UNITS OF MEASURE” from the
MENU screen.
Scroll to the units desired using the
arrow keys and press “SEL”. After a
brief pause, the display will return to the
MAIN screen and display the parameter
in the new units.
NOTE: pH units are standard and can not be changed.

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E. How to Take Measurements
1. Conductivity and Temperature Measurements
A. Turn the display module ON by using the left-most key, labeled with the
symbol.
B. Connect a conductivity/temp sensor module to any available port on the
display module.
C. Choose one of the following measurement methods:
Hansen Fittings
Sample Kit –
Mesa P/N 503110017
Syringe Sample tray
Sample Method: Insert the sensor
end of the conductivity/
temperature sensor module
into the container of test
solution as shown above. Draw
sample solution steadily
through the sensor module.
Note the display output while
the solution is flowing. When
the display is stable, take your
reading.
In-line Method: Connect condo/temp
sensor module directly to the
delivery system using the
Hansen connectors as shown
above. Reestablish flow
through the sensor module
and take your readings when
the display is stable.
2. pH Measurements
Module cable connected to 90XL display module
Sample Method: Insert the pH sensor module electrode into the sample as shown
above. When the display is stable, take your reading.

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3. How to Take Pressure Measurements
Turn on the 90XL meter and attach a pressure sensor module to any open port on
the top of the display module. Once the pressure sensor module is sensed,
pressure will be displayed in the appropriate channel section of the LCD screen.
The 90XL pressure sensor module can be used to verify the accuracy of arterial
and venous monitors, measure negative pressure and differential pressure of the
delivery system fluid.
WARNING
Use of transducer protectors is required when measuring pressure in liquid lines to
prevent intrusion of fluids into the pressure sensor module.
CAUTION:
If a transducer protector becomes wetted, it will not transmit pressure accurately
and must be replaced with a dry protector.
Module cable connected to 90XL display module
Disposable transducer protectors
Mesa P/N 503110023

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IMPORTANT:
Before measuring pressure, first verify that the display reads “0” with both
pressure ports open to atmospheric pressure. If necessary, zero the pressure
function using the procedure in the calibration section of this user’s guide.
Positive or Negative Pressure
To measure either positive or negative pressure, attach monitor line tubing to the
“Gauge” port. The “Ref” port must be open to atmosphere.
to positive or negative Negative Pressure Measurement
pressure source
Differential Pressure Measurement
To measure differential pressure, attach
monitor tubing to the “Gauge” and “Ref”
Luer ports on the pressure sensor
module. Pressure will read positive only
if the greater of the two measurement
points is connected to the “Gauge” port.
In-line and negative pressure adapters,
as well as monitor lines are available as
90XL accessories.

To 90XL Display Module
Open
Transducer Protector
Dialysis Machine
Negative Pressure
Adapter
Artificial Kidney