Galvanic Applied Sciences AccuLase-GPA Series Manual

AccuLase-GPA™
Hydrogen Sulfide Analyzer
Operation & Maintenance Manual
Revision 2
January 20, 2020
Galvanic Applied Sciences Inc.
7000 Fisher Road SE
Calgary, Alberta
T2H 0W3
Canada
Phone: [phone]
Toll Free: 1 866 252 8470
[email protected]
www.galvanic.com

2
NOTICES
All information in this manual is subject to change without notice and does not represent a commitment on the part
of Galvanic Applied Sciences, Inc.
Note: Changes or modifications not expressly approved by Galvanic Applied Sciences, Inc. could void the user's
authority to operate the equipment.
Purpose
This manual describes how to safely operate and maintain the AccuLase-GPA™.
Important
Read Section 1 before proceeding to use the AccuLase-GPA™. Galvanic Applied Sciences is not responsible for any
deviation from this manual.
Scope
If products and components from other manufacturers are used, these must be recommended or
approved by Galvanic Applied Sciences (The ‘Manufacturer’). Due to design changes and product improvements,
information is subject to change without notice. The Manufacturer reserves the right to change hardware and
software design at any time, which may subsequently affect the contents of this manual. The Manufacturer assumes
no responsibility for any errors that may appear in this manual. The Manufacturer will make every reasonable effort
to ensure that the manual is up to date and corresponds with your AccuLase-GPA™.
Users
The AccuLase-GPA™ described in this manual is intended for use by trained personnel. Trained personnel are those
who, based on their training and experience, are capable of identifying risks and avoiding potential hazards when
working with the AccuLase-GPA™. For start-up or technical assistance contact:
Galvanic Applied Sciences, Inc.
7000 Fisher Road S.E.
Calgary, Alberta, T2H 0W3 Canada
Phone: [phone]
Toll Free: 1-866-252-8470
[e-mail]
www.galvanic.com
© Copyright 2020, Galvanic Applied Sciences, Inc. All rights reserved.
Printed in Canada

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Table of Contents
Section 1: AccuLase-GPA™.......................................................................................................................... 11
1.1 Overview ..................................................................................................................................... 11
1.2 Principle of Operation................................................................................................................. 11
1.3 Features of the Analyzer ............................................................................................................. 11
1.4 System Operating Control........................................................................................................... 12
1.5 Installation and Safety ................................................................................................................ 12
Section 2: AccuLase-GPA™ Components .................................................................................................... 13
2.1 Overview ........................................................................................................................................... 13
2.2 Control Enclosure.............................................................................................................................. 13
2.2.1 Controller Board......................................................................................................................... 13
2.2.2 Display Board ............................................................................................................................. 14
2.2.3 Input / Output Board ................................................................................................................. 14
2.2.5 Intrinsically Safe (IS) Barrier (D1 Model Only) ........................................................................... 15
2.2.6 D2 Layout ................................................................................................................................... 16
2.3.1 TDLAS Control Module and Laser Source .................................................................................. 17
2.3.4 Cell Heater.................................................................................................................................. 17
2.3.5 Vacuum Pump ............................................................................................................................ 17
2.4 Sample Conditioning System ............................................................................................................ 17
Section 3: AccuLase-GPA™ Local Display User Interface ........................................................................... 18
3.1 Introduction ...................................................................................................................................... 18
3.2 Local UI Layout .................................................................................................................................. 18
3.3 Front Panel LEDs ............................................................................................................................... 19
3.4 Hand-Held Keypad ............................................................................................................................ 19
3.4 Home Panel ....................................................................................................................................... 21
3.5 Alarms Panel ..................................................................................................................................... 22
3.6 Inputs Panel ...................................................................................................................................... 23
3.7 Outputs Panel ................................................................................................................................... 24
3.8 Calibration Panel ............................................................................................................................... 25
3.9 Laser Panel ........................................................................................................................................ 26
3.10 Config Panel .................................................................................................................................... 27
3.10 Net Panel......................................................................................................................................... 28
3.10.1 Port Configuration ................................................................................................................... 29
3.10.2 Network Status ........................................................................................................................ 30
Section 4: AccuLase-GPA™ Web-Based GUI ............................................................................................... 31

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4.1 Introduction ...................................................................................................................................... 31
4.2 Connecting to the AccuLase-GPA™ via Ethernet .............................................................................. 31
4.2.1 Local Ethernet Connection......................................................................................................... 31
4.2.2 Remote Ethernet Connection via LAN ....................................................................................... 32
4.3 AccuLase-GPA™ Web GUI Overview ................................................................................................. 32
4.3.1 Status Indicators and Toolbar .................................................................................................... 33
4.3.2 Navigation Pane ......................................................................................................................... 34
4.4 Operator Menu ................................................................................................................................. 36
4.4.1 Home Page ................................................................................................................................. 36
4.4.2 Alarms Page ............................................................................................................................... 37
4.4.3 Hardware Status Page................................................................................................................ 37
4.4.3.1 Analog Inputs. ......................................................................................................................... 38
4.4.3.2 Analog Outputs ....................................................................................................................... 38
4.4.3.3 Digital Inputs ........................................................................................................................... 38
4.4.3.4 Solenoids................................................................................................................................. 38
4.4.3.5 Relays ...................................................................................................................................... 39
4.4.3.6 Communication Indicators...................................................................................................... 39
4.4.4 Global Page ................................................................................................................................ 39
4.4.4.1 Site Identification .................................................................................................................... 39
4.4.4.2 IO Board .................................................................................................................................. 39
4.4.4.3 Analysis ................................................................................................................................... 39
4.4.4.4 Bypass ..................................................................................................................................... 40
4.4.4.5 Laser........................................................................................................................................ 40
4.4.5 Calibration Page ......................................................................................................................... 40
4.4.6 Run Setup Page .......................................................................................................................... 41
4.4.6.1 Run Definition ......................................................................................................................... 41
4.4.6.2 Switching ................................................................................................................................. 42
4.4.6.3 Alarms ..................................................................................................................................... 42
4.4.7 Sequencer Page.......................................................................................................................... 43
4.4.8 Scheduler Page........................................................................................................................... 43
4.4.9 Alarm Setup Page....................................................................................................................... 44
4.4.9.1 Hardware Alarms .................................................................................................................... 45
4.4.9.2 Calibration Alarms................................................................................................................... 45
4.4.10 Modbus Page ........................................................................................................................... 46
4.4.11 Archive Page............................................................................................................................. 46
4.4.12 Events Page .............................................................................................................................. 47

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4.4.13 Discrete Inputs Page ................................................................................................................ 48
4.4.13.1 General Options .................................................................................................................... 49
4.4.13.2 Trigger Run............................................................................................................................ 49
4.4.13.3 Action .................................................................................................................................... 49
4.4.14 Outputs Page............................................................................................................................ 49
4.4.14.1 Relays .................................................................................................................................... 50
4.4.14.2 Solenoids............................................................................................................................... 50
4.4.14.3 Analog Outputs ..................................................................................................................... 51
4.4.15 Analog Inputs Page .................................................................................................................. 51
4.4.15.1 Excitation .............................................................................................................................. 52
4.4.15.2 Calibration............................................................................................................................. 52
4.4.15.3 Analog Input Alarms.............................................................................................................. 53
4.4.16 Drawing Page ........................................................................................................................... 53
4.4.17 Manual Page ............................................................................................................................ 54
4.4.18 About Page............................................................................................................................... 54
4.5 Technician Menu............................................................................................................................... 54
4.5.1 Output Test ................................................................................................................................ 54
4.5.1.1 Analog Output Calibration and Testing................................................................................... 55
4.5.1.2 Discrete Output Testing .......................................................................................................... 56
4.6 Factory Menu .................................................................................................................................... 57
Section 5: AccuLase-GPA™ Maintenance and Repair ................................................................................. 59
5.1 Overview ........................................................................................................................................... 59
5.2 Extracting the Component Rail from the AccuLase-GPA™ D1 Enclosure ......................................... 59
5.2.1 List of Materials Required .......................................................................................................... 59
5.2.2 Preparatory Steps ...................................................................................................................... 59
5.2.3 Extracting the Component Rail .................................................................................................. 59
5.3 Removing the Herriott Cell from the AccuLase-GPA™...................................................................... 62
5.3.1 List of Materials Required .......................................................................................................... 62
5.3.2 Preparatory Steps ...................................................................................................................... 63
5.3.3 Removing the Herriott Cell from the AccuLase-GPA™ D1 ......................................................... 63
5.3.4 Removing the Herriott Cell from the AccuLase-GPA™ D2 ......................................................... 65
5.4 Accessing and Cleaning the Herriot Cell Mirrors .............................................................................. 68
5.4.1 List of Materials Required .......................................................................................................... 68
5.4.2 Preparatory Steps ...................................................................................................................... 68
5.4.3 Accessing and Cleaning the Herriott Cell Mirrors ...................................................................... 68
5.5 Maintaining the Vacuum Pump Diaphragm, Plates and Seals.......................................................... 72

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5.5.1 List of Materials Required .......................................................................................................... 72
5.5.2 Preparatory Steps ...................................................................................................................... 72
5.5.3 Vacuum Pump Disassembly and Maintenance.......................................................................... 73
5.6 Replacing the Membrane and O-ring within the Liquid Membrane Separator................................ 78
5.6.1 List of Materials Required .......................................................................................................... 78
5.6.2 Preparatory Steps ...................................................................................................................... 78
5.6.3 Liquid Membrane Separator Disassembly and Maintenance.................................................... 78
Section 6: AccuLase-GPA™ Troubleshooting .............................................................................................. 83
6.1 Overview ........................................................................................................................................... 83
6.2 Diagnostic Alarms ............................................................................................................................. 83

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Safety Symbols used in Manual
The Danger symbol indicates a hazardous situation that, if not
avoided will result in death or serious injury.
The Warning symbol indicates a hazardous situation that, if not
avoided could result in death or serious injury.
The Caution symbol with the safety alert symbol indicates a
hazardous situation that, if not avoided could result in minor or
moderate injury, and/or damage to the analyzer system.
The Notice symbol is used to highlight information that will
optimize the use and reliability of the system.

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Important Safety Guidelines for the AccuLase-GPA™
Please read the following warnings and cautions carefully before using the AccuLase-GPA™.
This equipment must be used as specified by the manufacturer or overall safety will be
impaired.
Access to this equipment should be limited to authorized, trained personnel ONLY.
Observe all warning labels on the analyzer enclosures, as well as on related containers and
chemicals.
This manual should be fully reviewed prior to operation of the analyzer. .
The analog outputs and alarm relay contacts may be powered by a source separate from the
one (s) used to power the analyzer system. Disconnecting the main power source may not remove power
from the analog output signals
Any safety recommendations or comments contained herein are suggested guidelines only. Galvanic
Applied Sciences Inc. bears no responsibility and assumes no liability for the use and/or implementation of
these suggested procedures.
This system, when operating in its normal mode, and/or when it is being serviced, maintained,installed and
commissioned contains items which may be hazardous to humans if handled or operated incorrectly or
negligently.
The AccuLase-GPA™ can be configured to be safely operated in a CSA Class 1, Div. 2, Groups B, C. D
(D2 Model) or a Class 1, Div. 1, Groups B, C, D (D1 model) hazardous area.

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Manufacturer’s Warranty Statement
Galvanic Applied Sciences Inc. (“Seller”) warrants that its products will be free from defects in
materials and
workmanship under normal use and service in general process conditions for 12
months from the date of
Product start-up or 18 months from the date of shipping from Seller’s
production facility, whichever comes first
(the “Warranty Period”). Products purchased by Seller
fromathirdpartyforresaletoBuyer("ResaleProducts")
shall carry only the warranty extended by
the original manufacturer. Buyer agrees that Seller has no liability for
Resale Products beyond
making a reasonable commercial effort to arrange for procurement and shipping of
the Resale
Products. Buyer must give Seller notice of any warranty claim prior to the end of the Warranty
Period. Seller shall not be responsible for any defects (including latent defects) which are reported
to Seller
after the end of the Warranty Period.
THIS WARRANTY AND ITS REMEDIES ARE IN LIEU OF ALL OTHER WARRANTIES OR
CONDITIONS
EXPRESSED OR IMPLIED, ORAL OR WRITTEN, EITHER IN FACT OR BY
OPERATION OF LAW,
STATUTORY OR OTHERWISE, INCLUDING BUT NOT LIMITED TO,
WARRANTIES OR CONDITIONS
OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE, WHICH SELLER
SPECIFICALLYDISCLAIMS.
Seller’s obligation under this warranty shall not arise until Buyer notifies Seller of the defect.
Seller’s sole
responsibility and Buyer’s sole and exclusive remedy under this warranty is, at
Seller’s option, to replace
or repair any defective component part of the product upon receipt
of the Product at Seller’s production
facility,transportationchargesprepaidoracceptthereturn
of the defective Product and refund the purchase
price paid by Buyer for that Product. If
requestedbyBuyer,Sellerwilluseitsbesteffortstoperformwarranty
services at Buyer’s facility,
as soon as reasonably practicable after notification by the Buyer of a possible
defect provided
that Buyer agrees to pay for travel time, mileage from the Seller’s facility or travel costs to
the
airport / train station closest to Buyer’s facility plus all other travel fees, hotel expenses and
subsistence.
Except in the case of an authorized distributor or seller, authorized in writing by Seller to
extend this
warrantytothedistributor’scustomers,thewarrantyhereinappliesonlytotheoriginal
purchaser from Seller
(“Buyer”) and may not be assigned, sold, or otherwise transferred to a
third party. No warranty is made
with respect to used, reconstructed, refurbished, or previously
owned Products, which will be so marked on
the sales order and will be sold “As Is”.
Limitations
These warranties do not cover:
• Consumable items such as lamps.
• Analyzer components which may be damaged by exposure to contamination or fouling
from the
process fluid due to a process upset, improper sample extraction techniques
or improper sample
preparation, fluid pressures in excess of the analyzer’s maximum
rated pressure or fluid
temperatures in excess of the analyzer’s maximum rated
temperature. These include but are not
limited to sample filters, pressure regulators,
transfer tubing, sample cells, optical components,
pumps, measuring electrodes,
switching solenoids, pressure sensors or any other sample wetted
components.
• Loss, damage, or defects resulting from transportation to Buyer’s facility, improper or

10
inadequate maintenance by Buyer, software or interfaces supplied by Buyer,
operation outside the
environmental specifications for the instrument, use by
unauthorized or untrained personnel or
improper site maintenance or preparation.
• Products that have been altered or repaired by individuals other than Seller personnel
or its duly
authorized representatives, unless the alteration or repair has been
performed by an authorized
factory trained service technician in accordance with
written procedures supplied by Seller.
• Products that have been subject to misuse, neglect, accident, or improper installation.
• The sole and exclusive warranty applicable to software and firmware products provided
by Seller
for use with a processor internal or external to the Product will be as follows:
Seller warrants that
such software and firmware will conform to Seller’s program
manuals or other publicly available
documentation made available by Seller current at
the time of shipment to Buyer when properly
installed on that processor, provided
however that Seller does not warrant the operation of the
processor or software or
firmware will be uninterrupted or error-free.
ThewarrantyhereinappliesonlytoProductswithintheagreedcountryoforiginalenddestination.
Products
transferred outside the country of original end destination, either by the Seller at the
direction of the Buyer
or by Buyer’s actions subsequent to delivery, may be subject to additional
charges prior to warranty repair
or replacement of such Products based on the actual location
of suchProducts and Seller’s warrantyand/or
service surcharges for such location(s).
RepairedProducts
Repaired products are warranted for 90 days with the above exceptions.
Limitation of Remedy and Liability
IN NO EVENT SHALL SELLER BE LIABLE TO BUYER FOR ANY INDIRECT,
CONSEQUENTIAL,
INCIDENTAL, SPECIAL OR PUNITIVE DAMAGES, OR FOR ANY LOSS
OFUSEORPRODUCTION,OR
ANY LOSS OF DATA, PROFITS OR REVENUES, OR ANY
CLAIMS RAISED BY CUSTOMERS OF
BUYER OR ANY ENVIRONMENTAL DAMAGE OR
ANY FINES IMPOSED ON BUYER BY ANY
GOVERNMENTAL OR REGULATORY
AUTHORITIES, WHETHER SUCH DAMAGES ARE DIRECT OR
INDIRECT, AND
REGARDLESS OF THE FORM OF ACTION (WHETHER FOR BREACH OF CONTRACT
OR
WARRANTY OR IN TORT OR STRICT LIABILITY) AND WHETHER ADVISED OF THE
POSSIBILITY
OF SUCH DAMAGES OR NOT.

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Section 1: AccuLase-GPA™
1.1 Overview
The Galvanic Applied Sciences AccuLase-GPA™ uses Tunable Diode Laser Absorption Spectroscopy (TDLAS)
to determine the concentration of a target gas species (hydrogen sulfide, H2S) in a variety of gaseous
process streams.
1.2 Principle of Operation
The AccuLase-GPA™ is based on TDLAS in the near-infrared part of the electromagnetic spectrum,
combined with the use of a Herriott Cell to provide an optical path length of over 50 metres in a compact
package. Near-infrared TDLAS sensors provide fast, high-sensitivity measurement of a selected gas or
gases in complex sample gas mixtures. As with any optical absorption-based instrument, the
concentration of the target gas species can be determined by measuring the absorbance at a specific
wavelength characteristic of the target gas species. Molecules of the target gas absorb laser light at
frequencies corresponding to rotation, stretch, and bend vibrational modes for those molecules. The
relationship between the absorbance and is given by the Beer-Lambert Law, shown below:
= 
Where:
A = Absorbance
ε= molar absorptivity of the target gas
C = concentration of the target gas
l = optical path length
The specific wavelength at which the absorbance is measured is chosen to reduce interference from other
gaseous species in the gas mixture being analyzed to the greatest extent possible. The specific wavelength
of light emitted by the laser can be controlled by adjusting the current and / or the temperature of the
laser emitter. In order to improve the sensitivity of the analyzer, a detector signal processing method
known as Wavelength Modulation Spectroscopy is used. This method rejects noise and thus increases the
signal-to-noise ratio, allowing a much lower detectable limit for the target gas species than would
otherwise be possible.
1.3 Features of the Analyzer
The AccuLase-GPA™ provides the following capabilities:
•The ability to measure the concentration of hydrogen sulfide gas over a 0-500ppm range with
exceptional linearity and repeatability
•The ability to measure as many as 4 sample streams on a single analyzer
•Sensitivity down to 0.15ppm for Hydrogen Sulfide
•Rapid response within 30 seconds including sample conditioning
•No consumables other than calibration standard gas
•Very low maintenance and low cost of operation
•Ethernet communication for local and remote operation via a web-based GUI
•Built-in Data Logging
•Modbus communication via either RS232 or RS485

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1.4 System Operating Control
The AccuLase-GPA™ is controlled by a dedicated data acquisition system which provides supervisory
control, performs all calculations, and provides the local user interface. This control system also stores
the web based GUI that can be accessed via a personal computer and web browser connected by either
a local or a remote Ethernet connection.
The control system includes an onboard computer system that provides a full screen color display of the
target gas concentration, key system control parameters, and their status. A hand held keypad is provided
for user interface with the control system, and can be used to view and edit the analyzer configuration,
as well as navigate through the variety of display screens included in the local user interface. Operation
of the system using the handheld keypad is described in Section 3. As an alternative, a web browser-based
graphical user interface (GUI) can be used to view and / or enter data on a local or remote basis. Operation
of the analyzer via the web-based GUI is described in Section 4.
1.5 Installation and Safety
For information regarding the safety considerations, installation requirements, and hazardous area
classifications of the AccuLase-GPA™, please refer to the document AccuLase-GPA™ Analyzer Installation
and Safety Manual.

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Section 2: AccuLase-GPA™ Components
2.1 Overview
The AccuLase-GPA™ is an integrated system designed to monitor the concentration of a target gas,
hydrogen sulfide, in a gaseous stream or multiple streams using the Tunable Diode Laser Absorption
Spectroscopy (TDLAS) method described in Section 1.2. The AccuLase-GPA™ can be divided into three
separate areas, as follows:
•Control Enclosure (Section 2.2)
•Optics / Sample Cell Enclosure (Section 2.3)
•Sample Conditioning System (Section 2.4).
2.2 Control Enclosure
The control enclosure is located on the top of the AccuLase-GPA™. It houses all of the analyzer electronics,
including the analyzer’s local display, controller (mother) board, input/output (I/O) board, AC/DC power
supply, and intrinsically safe barrier board (AccuLase-GPA™ D1 only).
2.2.1 Controller Board
The controller board, which is mounted behind the analyzer display board on the control
enclosure door, is the control computer for the AccuLase-GPA™. It includes the system central
processor unit, memory, solid state storage, clock battery, and USB / Ethernet connection ports.
The controller board is shown in Figure 1.
Figure 1: AccuLase-GPA™ Controller Board

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The Ethernet ports can be used for local or remote connection via the web-based GUI program.
One USB port is used for communication with the Input / Output (IO) board. The other USB ports
can be used to download the archive data from the on-board storage.
2.2.2 Display Board
The AccuLase-GPA™ display board is the electronics board that includes the analyzer’s 7-inch full
color liquid crystal display (LCD), shown in Figure 2.
Figure 2: AccuLase-GPA™ Display
The LCD is used to display the analyzer’s local user interface, which displays analysis results and a
variety of other analyzer parameters, and can also be used to make some changes to the analyzer
configuration. The local display can be manipulated using the analyzer’s hand-held keypad.The
operation of the local user interface is described in Section 3 of this manual.
Above the display are three status LEDs which are used to indicate various aspects of the analyzer
status. The function of these LEDs is described in Section 3.2.
2.2.3 Input / Output Board
The Input / Output (IO) board is mounted inside the electronics enclosure. The interior of the
electronics enclosure of the AccuLase-GPA™ D1 model.
The IO board handles all of the analyzer’s inputs and outputs. Inputs to the IO board include the
data from the laser control module from the analyzer’s optics/sample cell enclosure, the sample
cell temperature and pressure transducer inputs, and inputs from the analyzer’s hand held keypad.
Outputs from the IO board include 4-20mA analog outputs (up to 4, one per sample stream) for
analysis data, mechanical relays (4) for status outputs, a solid state relay for PID control of the
sample cell temperature, serial (RS-485) communication for MODBUS, and 8 solenoid controllers
for sample stream switching. The IO board communicates with the analyzer’s controller board via
a USB connection.

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2.2.5 Intrinsically Safe (IS) Barrier (D1 Model Only)
The intrinsically safe (IS) barrier is mounted in the top left corner of the control enclosure of
AccuLase-GPA™ D1 control enclosure. The intrinsically safe barrier connections are shown in
Figure 5.
Figure 3: Intrinsically Safe (IS) Barrier
The wiring connections for the analyzer’s hand-held keypad pass through the IS barrier.
NOTICE: TO ENSURE THAT THE ANALYZER OPERATES CORRECTLY, THE GROUND SCREWS ON THE
IS BARRIER MUST BE CONNECTED TO THE PLANT’S HIGH INTEGRITY GROUND.

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2.2.6 D2 Layout
Figure 4: Optics / Sample Cell Enclosure Layout (D2)
The main components found in the optics / sample cell enclosure include the laser launcher and detector
(1), the Herriott sample cell (2), the TDLAS control module and laser source (3), the cell heater (4), and the
vacuum pump (5).
1
2
3
4
5

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2.3.1 TDLAS Control Module and Laser Source
The TDLAS Control Module is an electronics board mounted inside the Optics / Sample Cell
enclosure. The laser source is mounted on this electronics board and connected to the sample cell
laser launcher optics via a telecommunications grade optical fibre. The TDLAS Control Module
with Laser source is shown in Figure 8.
Figure 5: TDLAS Control Module and Laser Source
The laser source is mounted just to the right of the centre of the board in the photo, along with
its associated heating and cooling equipment used for the tuning of the output wavelength.
2.3.4 Cell Heater
The sample cell and associated optical components are heated to 40°C to ensure measurement
stability. The block heater is visible just to the left of the TDLAS control module in Figure 11. The
temperature is controlled precisely by a PID heater controller on the analyzer’s IO Board. The cell
temperature is monitored using an RTD that sends signals back to the IO board, and this
2.3.5 Vacuum Pump
To improve the separation between the chosen absorbance wavelength for the target gas and
absorbance wavelengths of other interfering species, the interior of the sample cell is maintained
at a partial vacuum by use of a vacuum pump. The vacuum pump of the AccuLase-GPA™ is shown
in Figure 12. The vacuum pump is an oil-free design with very low maintenance requirements. It
is also mounted to the same metal frame as all the other components in the optics / sample cell
enclosure. The cell pressure is monitored using a pressure transducer that sends signals to the
analyzer’s IO board, and this pressure is available for display on both the analyzer’s local display
screen and in the web-based GUI software.
2.4 Sample Conditioning System
The sample conditioning system is used to ensure that the conditions of the sample entering the sample
cell are within the required specifications. A typical sample conditioning system for an AccuLase-GPA™.
A typical sample conditioning system for the AccuLase-GPA™ will include switching valves, a pressure
regulator, a liquid membrane separator, and a sample sweep valve.

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Section 3: AccuLase-GPA™ Local Display User Interface
3.1 Introduction
The front panel of the AccuLase-GPA™ control enclosure includes three LEDs and a color LCD display which
provides information about the status of the analyzer. In addition, a handheld keypad can be used to view
and/or edit a range of analyzer settings and analytical results.
3.2 Local UI Layout
The screen layout of the AccuLase-GPA™ local UI is shown in Figure 14.
Figure 6: Local UI Layout
On the top row of the screen are two fields. The field on the left displays the analyzer’s IP address. This is
the address that must be entered into the web browser of a computer connected either directly to the
analyzer via the Ethernet port on the front panel of the analyzer or remotely via the plant local area
network in order to access the analyzer’s web-based graphical user interface. The Web GUI is described
in detail in Section 4. The field on the right displays the current date and time of the analyzer’s real time
clock. This date and time is used to timestamp all data in the analyzer’s data logs.
On the left of the screen are a series of tabs oriented vertically. These tabs represent the various panels
of the analyzer’s local user interface. The tab of the panel that is currently being displayed on the screen
is highlighted in blue. The PANEL NEXT and PANEL PREV buttons on the keypad can be used to navigate
through these panels. Pressing PANEL NEXT will move downwards to the subsequent tab, while pressing
PANEL PREV will move up to the previous tab. Pressing PANEL NEXT from the bottom-most tab will return
to the top-most tab. The data displayed on each panel will be discussed in detail in this section.

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3.3 Front Panel LEDs
There are three colored LEDs above the LCD on the front panel of the AccuLase-GPA™, as shown in Figure
15.
Figure 7: Front panel LCD Showing Status LEDs
These LEDs are used to indicate specific analyzer status-related information. The function of these three
LEDs is indicated in Table 1.
Table 1: Front Panel LEDs
LED Label
LED Color
Function
Keypad Blue
This LED illuminates any time a key on the keypad is pressed. It remains
illuminated until the input from the keypad has been processed by the
analyzer electronics. While this LED is illuminated, no further input from
the keypad will be recognized until the LED turns off.
IO Comm Green
This LED flashes green to indicate successful communication between the
controller and IO boards.
Alarm
Red
This LED illuminates when there is an active alarm.
3.4 Hand-Held Keypad
The hand held keypad allows the user to navigate through the AccuLase-GPA™ local user interface. The
AccuLase-GPA™ handheld keypad is shown in Figure 16.

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Figure 8: AccuLase-GPA™ Handheld Keypad
The keypad has 20 keys. Eleven keys are used for data entry (numerals 0-9 and a decimal point). The
remaining 9 keys have functions that are described in Table 2.
Table 2: Keypad Key Functions
Key
Function
PANEL PREV
Used to navigate to the previous display panel (up) in the local UI.
PANEL NEXT
Used to navigate to the next display panel (down) in the local UI.
FIELD PREV
Used to navigate to the previous data entry field /manipulatable control on a
given display panel (up).
FIELD NEXT
Used to navigate to the next data entry field / manipulatable control on a given
display panel (down).
HOME
Used to navigate directly to the Home panel which displays the current
calculated concentration.
BYPASS
Used to toggle bypass mode on and off.
DEL
Used to delete data while editing a numerical value.
EXIT
Used to exit from editing a numerical parameter without saving changes.
ENTER
Used to save changes when editing a numerical parameter or to toggle a
manipulatable control.