Sensidyne SensAlert ASI S2 Series User manual

Advanced Safety Integrity
Universal Gas Transmitter
User Manual
Document No. 360-0152-01, Rev F0
Sensidyne, LP
1000 112TH Circle N, Suite 100
St. Petersburg, Florida 33716 USA
Tel: [phone] • Fax:[phone] [fax]
web: www.Sensidyne.com • www.SensidyneGasDetection.com
e-mail: [e-mail]

SensAlert ASI – Advanced Safety Integrity Gas Transmitter
Sensidyne Document No. 360-0152-01 (Rev F0) 1
How to Use This Manual
This manual is a basic guide for using the SensAlert ASI Transmitter. It contains information on the
transmitter, transmitter components, sensor types, and the Normal Operation Display. It also shows how
to mount and wire the transmitter, initial setup, zeroing, and span calibration. In addition, it covers
commonly used operations regarding alarms, relays, and Test-On-Demand. For reference, the entire
menu structure is outlined in Section Menu Map, with descriptions of each function described in Section
5.3.
Important notes, cautions, and warnings are set off from the other text as follows:
NOTE
This is an important note
Because the SensAlert ASI Transmitter is menu driven it is important to become familiar with how the four
magnetic switch controls are used to navigate through the menus, select specific menu items, and
change the many different parameters available to the user. The Basic Guide below will help you toward
this end.
Basic Guide to Using the Menu System
Selecting ACK from the Normal Operation Display enters the SensAlert ASI menu system. Within the
menu system ACK is used in several ways: 1) to select an item from a list of menu items, 2) to confirm
that an action has occurred (e.g. changing an alarm from “Non-Latching” to “Latching”), or 3) to save a
new value that has been entered (e.g., a new alarm setpoint).
The << control backs up to the previously displayed menu. If a change was in progress, the changes are
discarded. It is similar in use to an ESC key on a computer keyboard.
The ▲control arrow is used to move UP a list of menu items.
The ▼control arrow is used to move DOWN a list of menu items.
The ▲and ▼control arrows also are used to increase/decrease numeric values of certain menu items
(e.g. alarm setpoint, cal gas concentration, etc.).
PLEASE NOTE
This manual contains illustrations of those display screen menu options generally used in the normal
course of operation of the SensAlert ASI Transmitter. The transmitter may also display a variety of
additional warning or cautionary screens. These additional display screens are generally instructive and
self-explanatory in nature. The user should read each display screen carefully and perform the
recommended actions as required.
Important
Factory Default Settings
Each transmitter is shipped from the factory with default settings. These include default settings for
alarms, warnings and relays. The default settings can be found in Section 13 – Appendix G: Configuration
Reference (page 112). Please note that boxes filled with an “X” indicate a default setting for that particular
alarm, warning, or relay. Additional blank copies of the Configuration Reference form can be found in
Section 13. These blank forms are intended for use by the user to document user-defined changes from
the factory default settings.

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2 Sensidyne Document No. 360-0152-01 (Rev F0)
Table of Contents
How to Use This Manual ................................................................................................................................1
Basic Guide to Using the Menu System.........................................................................................................1
Packing List and Notices................................................................................................................................7
WARNINGS....................................................................................................................................................8
1INTRODUCTION......................................................................................................... 10
1.1 Product Versions.................................................................................................................................10
1.2 Standard Features ..............................................................................................................................11
1.2.1 Universal Sensor Capability.......................................................................................................11
1.2.2 Large Display for Ease of Operation..........................................................................................11
1.2.3 Worldwide Certifications............................................................................................................. 11
1.2.4 Transportable Calibration...........................................................................................................11
1.2.5 Unrestricted Operation in Hazardous Areas ..............................................................................11
1.2.6 Predictive Failure........................................................................................................................12
1.3 Optional Features................................................................................................................................12
1.3.1 Test-On-Demand™ ...................................................................................................................12
1.3.2 Remote Sensor Operation..........................................................................................................12
1.3.3 Relay Outputs.............................................................................................................................12
1.3.4 Communication Options.............................................................................................................12
1.4 Components........................................................................................................................................13
1.4.1 Sensor Interface Assembly ........................................................................................................ 13
1.4.2 13
1.4.3 Test-on-Demand™..................................................................................................................... 13
1.4.4 Sensor Holder.............................................................................................................................13
1.4.5 Rainshield...................................................................................................................................13
1.4.6 Calibration Plug Assembly .........................................................................................................13
1.4.7 Liquid Crystal Display.................................................................................................................17
1.4.8 Sensor Types .............................................................................................................................18
2INSTALLATION.......................................................................................................... 20
2.1 Location...............................................................................................................................................20
2.2 Transmitter..........................................................................................................................................22
2.3 Transmitter Board Removal................................................................................................................23
2.3.1 Transmitter, 2-Wire, Non-I.S., No Optional Boards...................................................................23
2.3.2 Transmitter, 3-Wire, Non-I.S., No Optional Boards...................................................................24
2.3.3 Transmitter, 3-Wire, I.S., No Optional Boards...........................................................................25
2.3.4 Transmitter, 3-Wire, Non-I.S., Two Optional Boards.................................................................26
Wiring............................................................................................................................................................27
2.3.5 Allowable Line Length ................................................................................................................28
2.3.6 Wiring the Power Supply Board .................................................................................................29
2.3.6.1 DC Wiring Procedure 2 wire Transmitters............................................................................................ 29
2.3.6.2 DC Wiring Procedure 3 wire Transmitters............................................................................................ 31
2.3.6.3 Wiring The Built-In Relay...................................................................................................................... 32
2.3.7 Wiring Relays 2-4 (Optional)......................................................................................................33
2.3.8 Intrinsic Safety Barrier................................................................................................................34
2.4 Start Up...............................................................................................................................................35

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Sensidyne Document No. 360-0152-01 (Rev F0) 3
3OPERATING FUNCTIONS .........................................................................................36
3.1 Zeroing The Sensor.............................................................................................................................36
3.2 Span Calibration..................................................................................................................................38
3.2.1 General .......................................................................................................................................38
3.2.2 Calibration Equipment.................................................................................................................38
3.2.3 Span Calibration Procedure........................................................................................................38
3.3 Sensor Adjustment ..............................................................................................................................42
3.3.1 Accessing The Sensor Adjustment Menu...................................................................................42
3.3.2 Select Cal Gas............................................................................................................................43
3.3.3 Selecting a K Factor....................................................................................................................44
3.3.3.1 Catalytic Bead Combustible Sensor Installed (Calibration Gas is Methane).........................................44
3.3.3.2 Catalytic Bead Combustible Sensor Installed (Calibration Gas is Propane) .........................................45
3.3.3.3 Infrared Combustible Sensor Installed (Calibration Gas is Propane)....................................................45
3.3.3.4 Infrared Combustible Sensor Installed (Calibration Gas is Methane)....................................................46
3.3.4 Selecting a Custom K Factor......................................................................................................46
3.4 TOD Mode Adjustment........................................................................................................................47
3.4.1 Accessing The TOD Mode Adjustment Menu.............................................................................47
3.4.2 Auto Mode Enable ......................................................................................................................49
3.4.3 Test Date/Time ...........................................................................................................................49
3.4.4 Days Between Tests...................................................................................................................50
3.4.5 Cell Intensity ...............................................................................................................................50
3.4.6 Output Indicators.........................................................................................................................51
4ALARMS AND RELAYS .............................................................................................52
4.1 Accessing Alarm & Relay Menus ........................................................................................................52
4.2 Alarm Functions...................................................................................................................................53
4.2.1 Alarms 1 – 3, TWA Alarm ...........................................................................................................53
4.2.1.1 Add Relay .............................................................................................................................................53
4.2.1.2 Delete Relay..........................................................................................................................................54
4.2.1.3 Enable/Disable Alarm............................................................................................................................54
4.2.1.4 Ascending/Descending Alarm...............................................................................................................55
4.2.1.5 Alarm Setpoint.......................................................................................................................................55
4.2.1.6 Release Offset (Alarms 1 – 3)...............................................................................................................56
4.2.1.7 Average Time Adjust (TWA Alarm).......................................................................................................56
4.3 Fault Functions....................................................................................................................................58
4.3.1 Head Fail.....................................................................................................................................58
4.3.1.1 Add Relay .............................................................................................................................................58
4.3.1.2 Delete Relay..........................................................................................................................................59
4.3.1.3 Enable/Disable......................................................................................................................................60
4.3.1.4 Adjust Fault Current..............................................................................................................................60
4.3.1.5 Adjust Current Delay.............................................................................................................................60
4.4 Relays 1 - 4..........................................................................................................................................61
4.4.1 Latching/Non-Latching................................................................................................................61
4.4.2 Norm Energized/Norm De-energized .........................................................................................62
4.4.3 Time Delay..................................................................................................................................63
4.5 Warn Current – Relay 5.......................................................................................................................63
4.5.1 Latching/Non-Latching................................................................................................................63
4.5.2 Enable/Disable............................................................................................................................64
4.5.3 Low Current Time Adjust ............................................................................................................64
5MENU STRUCTURE...................................................................................................66

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4 Sensidyne Document No. 360-0152-01 (Rev F0)
5.1 Basic Guide to Using the Menu System .............................................................................................66
5.2 Menu Map ...........................................................................................................................................66
5.2.1 Calibration Mode ........................................................................................................................66
5.2.1.1 Zero Transmitter................................................................................................................................... 66
5.2.1.2 Calibrate............................................................................................................................................... 66
5.2.1.3 Set Cal Gas Conc................................................................................................................................. 66
5.2.2 Maintenance Mode..................................................................................................................... 66
5.2.3 Data Review............................................................................................................................... 67
5.2.3.1 Previous Cal Info.................................................................................................................................. 67
5.2.3.2 Sensor Status....................................................................................................................................... 67
5.2.3.3 Sensor Data.......................................................................................................................................... 67
5.2.3.4 Active Alarms/Faults............................................................................................................................. 67
5.2.3.5 Fault Current......................................................................................................................................... 67
5.2.3.6 Fault Current Delay .............................................................................................................................. 67
5.2.3.7 Rly Alm Fault Config............................................................................................................................. 67
5.2.3.8 TOD Data Review................................................................................................................................. 69
5.2.3.9 Communications Review...................................................................................................................... 69
5.2.3.10 Firmware Version ................................................................................................................................. 69
5.2.4 Test On Demand........................................................................................................................ 69
5.2.4.1 4-20 mA Not Active............................................................................................................................... 69
5.2.4.2 4-20 mA Active..................................................................................................................................... 69
5.2.5 System Configuration.................................................................................................................70
5.2.5.1 Self Test70
5.2.5.2 Alarm Settings...................................................................................................................................... 70
5.2.5.3 4/20ma Adjustment............................................................................................................................... 76
5.2.5.4 Adjust Date/Time.................................................................................................................................. 76
5.2.5.5 Communication Setup.......................................................................................................................... 76
5.2.5.6 T-O-D Mode Adjustment....................................................................................................................... 76
5.2.5.7 Sensor Adjustment............................................................................................................................... 77
5.2.5.8 Set Password ....................................................................................................................................... 78
5.2.5.9 Reset Defaults...................................................................................................................................... 78
5.2.5.10 Set Transmitter Tag.............................................................................................................................. 78
5.2.5.11 Screen Contract.................................................................................................................................... 78
5.2.6 Lost Password............................................................................................................................78
5.3 Main Menu ..........................................................................................................................................79
5.3.1 Calibration Mode .......................................................................................................................79
5.3.1.1 Zero Transmitter................................................................................................................................... 79
5.3.1.2 Calibrate............................................................................................................................................... 80
5.3.1.3 Set Cal Gas Concentration................................................................................................................... 80
5.3.2 Maintenance Mode..................................................................................................................... 80
5.3.3 Data Review............................................................................................................................... 81
5.3.3.1 Calibration Info ..................................................................................................................................... 81
5.3.3.2 Sensor Status....................................................................................................................................... 81
5.3.3.3 Sensor Data.......................................................................................................................................... 81
5.3.3.4 Active Alarms/Faults............................................................................................................................. 82
5.3.3.5 Fault Currents....................................................................................................................................... 82
5.3.3.6 Fault Current Delay .............................................................................................................................. 82
5.3.3.7 Rly Alm Fault Config............................................................................................................................. 83
5.3.3.8 TOD Review......................................................................................................................................... 83
5.3.3.9 Communication Review........................................................................................................................ 84
5.3.3.10 Firmware Review.................................................................................................................................. 84
5.3.4 Test-On-Demand (Main Menu) ..................................................................................................85
5.3.5 System Configuration.................................................................................................................85
5.3.5.1 Self Test86
5.3.5.2 Alarm Settings...................................................................................................................................... 86
5.3.5.3 4/20 mA Adjustment............................................................................................................................. 91
5.3.5.4 Adjust Date/Time.................................................................................................................................. 91
5.3.5.5 Communication Setup.......................................................................................................................... 92
5.3.5.6 TOD Mode Adjustment......................................................................................................................... 93
5.3.5.7 Sensor Adjustment............................................................................................................................... 93
5.3.5.8 Set Password ....................................................................................................................................... 94
5.3.5.9 Reset Defaults...................................................................................................................................... 95

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Sensidyne Document No. 360-0152-01 (Rev F0) 5
5.3.5.10 Set Transmitter Tag ..............................................................................................................................95
5.3.5.11 Screen Contrast....................................................................................................................................96
6PRODUCT NUMBERS & PARTS LIST ......................................................................97
6.1 Transmitters.........................................................................................................................................97
6.2 Sensors................................................................................................................................................98
6.3 Options & Accessories ........................................................................................................................99
6.4 Spare Parts..........................................................................................................................................99
6.5 Calibration Equipment .......................................................................................................................100
6.6 Zero Calibration Gases......................................................................................................................100
6.7 Calibration Gases..............................................................................................................................100
7APPENDIX A: SAFETY REQUIREMENTS FOR SIL2 APPLICATIONS..................102
7.1 Safety Function..................................................................................................................................102
7.2 Topology............................................................................................................................................102
7.3 Throughput ........................................................................................................................................102
7.4 User Input ..........................................................................................................................................102
7.5 Proof Interval .....................................................................................................................................102
8APPENDIX B: DECLARATION OF CONFORMITY..................................................103
9APPENDIX C: SPECIFICATIONS.............................................................................105
10 APPENDIX D: TROUBLESHOOTING GUIDE..........................................................106
11 APPENDIX E: APPROVAL RATINGS......................................................................108
• SensAlert ASI 2-Wire Div2 Transmitter ...............................................................................................108
• SensAlert ASI 3Wire Div2 Transmitter.................................................................................................108
• SensAlert ASI 2-Wire IS Transmitter....................................................................................................109
• SensAlert ASI 3-Wire IS Transmitter....................................................................................................109
• SensAlert ASI 2-Wire XP Transmitter ..................................................................................................110
• SensAlert ASI 3-Wire XP Transmitter ..................................................................................................110
12 APPENDIX F: RETURNED MATERIAL AUTHORIZATION.....................................111
13 APPENDIX G: CONFIGURATION REFERENCE.....................................................112
14 APPENDIX H: MOUNTING DRAWINGS ..................................................................114

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6 Sensidyne Document No. 360-0152-01 (Rev F0)
15 APPENDIX I: CERTIFICATION DRAWINGS ........................................................... 116

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Sensidyne Document No. 360-0152-01 (Rev F0) 7
Packing List and Notices
You should have the following items:
SensAlert ASI Universal Gas Transmitter (includes a reversible screwdriver with magnetic end and a
Sensor Shield)
User Manual (this document)
Plus Series Sensor is sold separately
(Please contact factory for a complete list of available sensors.)
Always check to make certain you have received all of the items listed above. If you have any questions
or need assistance, contact your Sensidyne Representative, or call 800-451-9444 or [phone]
PROPRIETARY NOTICE
This manual was prepared by Sensidyne, LP exclusively for the owner of the SensAlert ASI Universal Gas
Transmitter. The material within this manual is the proprietary information of Sensidyne, LP and is to be
used only to understand and operate the instrument. By receiving this document, the recipient agrees that
neither this document nor the information disclosed within nor any part shall be reproduced or transferred,
physically, electronically or in any form or used or disclosed to others for manufacturing or for any other
purpose except as specifically authorized in writing by Sensidyne, LP.
COPYRIGHT NOTICE
©2012, Sensidyne, LP All rights reserved. Information contained in this document is protected by
copyright. No part of this document may be photocopied, reproduced, or translated to another program or
system without prior written authorization from Sensidyne, LP
TRADEMARK NOTICE
Sensidyne, the Sensidyne logo, SensAlert, the SensAlert & SensAlert ASI logos, T-O-D & Test-on-
Demand are registered trademarks of Sensidyne, LP. The trademarks and service marks of Sensidyne,
LP are protected through use and registration in the United States of America.
SOFTWARE LICENSE
The software included with the SensAlert ASI Transmitter is the property of Sensidyne, LP and shall
remain the property of Sensidyne, LP in perpetuity. The software is protected by U.S. and international
copyright laws and is licensed for specific use with the SensAlert ASI Universal Gas Transmitter. The user
may not reverse-engineer, disassemble, decompile, or make any attempt to discover the source code of
the software. The software may not be translated, copied, merged or modified in any way. The user may
not sublicense, rent, or lease any portion of the software. The right to use the software terminates
automatically if any part of this license is violated.
DISCLAIMER
SENSIDYNE, LP ASSUMES NO RESPONSIBILITY WHATSOEVER, TO ANY PARTY WHOSOEVER,
FOR ANY PROPERTY DAMAGE, PERSONAL INJURY, OR DEATH CAUSED BY OR RESULTING
FROM, IN WHOLE, OR IN PART, THE IMPROPER USE, INSTALLATION, OR STORAGE OF THIS
PRODUCT BY THE USER, PERSON, FIRM, ENTITY, CORPORATION OR PARTY NOT ADHERING TO
THE INSTRUCTIONS AND WARNINGS OR NOT ADHERING TO ALL FEDERAL, STATE, AND LOCAL
ENVIRONMENTAL AND OCCUPATIONAL HEALTH AND SAFETY LAWS AND REGULATIONS.
THE SELLER SHALL NOT BE LIABLE FOR DIRECT, INDIRECT, CONSEQUENTIAL, INCIDENTAL OR
OTHER DAMAGES RESULTING FROM THE SALE AND USE OF ANY GOODS AND SELLER’S
LIABILITY HEREUNDER SHALL BE LIMITED TO REPAIR OR REPLACEMENT OF ANY GOODS
FOUND DEFECTIVE. THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY
AND FITNESS FOR USE OR FOR A PARTICULAR PURPOSE WHICH ARE EXPRESSLY
DISCLAIMED.

SensAlert ASI – Advanced Safety Integrity Gas Transmitter
8 Sensidyne Document No. 360-0152-01 (Rev F0)
WARNINGS
READ AND UNDERSTAND ALL WARNINGS AND INSTRUCTIONS BEFORE USE.
Failure to read, understand, and comply with ALL accompanying literature, instructions, product
labels, and warnings could result in property damage, severe personal injury, or death.
Product is tested and calibrated at the factory prior to shipment. However, this product must be calibrated
prior to initial use and at regular intervals in accordance with this User Manual to ensure proper operation.
Failure to calibrate and operate this product in accordance with this User Manual may result in the
malfunction of the product.
Read and understand ALL applicable federal, state, and local environmental health and safety laws and
regulations, including OSHA. Ensure complete compliance with ALL applicable laws and regulations
before and during use of this product.
The user/installer must understand the Hazardous Area Protection Concepts and Area Classifications
applicable to their operation.
UNDER NO CIRCUMSTANCES should this product be used except by qualified, trained, technically
competent personnel and not until the warnings, User Manual, labels, and other literature accompanying
this product have been read and understood.
Failure to read and understand the User Manual may result in preventable severe personal injury or
death.
ALWAYS wash your hands thoroughly after handling, calibrating, or servicing this product.
ALWAYS wear eye protection (such as safety goggles), face shield, chemical resistant gloves and
chemical resistant clothing when handling chemicals, or calibration sources.
DO NOT get chemicals, gases, fumes, or vapors in your eyes or on your skin, as they may cause severe
burns to skin and eyes. If chemicals, gases, fumes, or vapors get in your eyes or on your skin, wash the
affected area with copious amounts of water and call a physician immediately.
ALWAYS avoid any contact of acids with your skin or eyes. Seek immediate medical attention for any
contact with acids.
ALWAYS calibrate in a well ventilated area. Adequate precautions should be taken to prevent the buildup
of ANY calibration sources or vapors. Avoid breathing ANY calibration fumes or vapors as they may be
hazardous to your health.
ALWAYS dispose of chemicals and calibration sources in compliance with ALL applicable safety laws,
regulations, and guidelines for proper disposal. Failure to do so may result in environmental damage,
property damage, personal injury or death.
ALWAYS close ALL containers of chemicals used with this product after use.
ALWAYS ensure that any compressed calibration substance sources are empty prior to disposal, should
they be used.
ALWAYS use clean, dry, inert materials to contain and transfer substances used for calibration.
DO NOT remove, cover, or alter any label or tag on this product, its accessories, or related products.
DO NOT operate this product should it malfunction or require repair. Operation of a malfunctioning
product, or a product requiring repair may result in serious personal injury or death.
DO NOT attempt to repair or modify instrument, except as specified in the Operation & Service Manual. If
repair is needed, contact the Sensidyne Service Dept. to arrange for a Returned Material Authorization
(RMA) (See Section 12 for details).
Users should refer to MSDS and suppliers’ instructions for proper handling and safety instructions for any
chemicals used with this equipment.
For Combustible Sensors installed per Canadian requirements the Sensor Interface (Head) shall be
mounted remotely from the Display Unit.

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Sensidyne Document No. 360-0152-01 (Rev F0) 9
WARNINGS
READ AND UNDERSTAND ALL WARNINGS BEFORE USE
Use ONLY genuine SENSIDYNE® replacement parts when performing any maintenance procedures
described in this manual. Failure to do so may seriously impair instrument performance and affect the
Hazardous Area Certification. Repair or alteration of the product beyond the scope of these maintenance
instructions, or by anyone other than an authorized SENSIDYNE® service technician, could cause the
product to fail to perform as designed and persons who rely on this product for their safety could sustain
severe personal injury or death.
The SensAlert ASI Universal Gas Transmitter is an ambient air monitoring device. Restricting the access
of ambient air to the sensor may result in less than optimal monitoring performance.
Prolonged exposure to excessively high concentrations of toxic gas may cause the sensor to produce
erroneous readings.
Always make use of a rainshield to protect against variations caused by environmental conditions.
Perform tests only within the specified operating ranges.
Sudden changes in pressure may cause temporary fluctuations in the sensor reading.
Sensors should be hot-swapped only when the Normal Operation Mode screen is displayed.
Important Calibration Considerations:
Verify concentration of calibration gas before making calibration adjustments.
Concentration can be altered by:
Deterioration of the concentration of compressed calibration gas sources during storage.
Interaction of the calibration gas with materials used to contain and transfer the gases, as for
example, absorption onto and permeation through certain plastics.
Interaction of the calibration gas with materials and/or ambient contaminants, as for example,
absorption into water.
If further translation is required, please contact the Sensidyne EU Authorized Representative (see Back
Cover for contact information).
.

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10 Sensidyne Document No. 360-0152-01 (Rev F0)
1INTRODUCTION
This manual provides specific information concerning the installation,
operation, calibration, and maintenance of the SensAlert ASI Universal Gas
Transmitter. The transmitter is capable of detecting the presence of
potentially hazardous concentrations of a target gas.
1.1 Product Versions
SensAlert ASI is a configurable instrument. The part numbering convention
contains all necessary information to express the configuration:

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Sensidyne Document No. 360-0152-01 (Rev F0) 11
A standard transmitter consists of an electronics module (Inside metal
housing), a sensor interface assembly, and a sensor assembly specifically
designed to detect a target substance. Product specifications for the
SensAlert ASI Transmitter can be found in Appendix C: Specifications.
1.2 Standard Features
1.2.1 Universal Sensor Capability
The SensAlert ASI transmitter unit is capable of utilizing a variety of sensor
technologies, including electrochemical, catalytic bead combustible, and
infrared combustible and carbon dioxide. Sensors may be installed without
having to reconfigure or modify the transmitter in any way. When a different
Plus Series sensor type is installed in the transmitter, the unit completely
reconfigures the system functions to match those of the new sensor. This
includes changing all alarm and calibration settings to match those of the new
sensor. The sensor interface assembly is certified as Intrinsically Safe,
allowing sensors to be changed in hazardous areas with the transmitter
under power.
1.2.2 Large Display for Ease of Operation
The transmitter has a large built-in graphical display that is easy to read and
operate. See Section 1.4.7 for more information.
1.2.3 Worldwide Certifications
The SensAlert ASI Universal Gas Transmitter is certified for operation in
hazardous environments worldwide. The transmitter is SIL 2 certified. FM
certification for both hazardous area and measurement performance is
available for a large variety of combustible and toxic sensors.
1.2.4 Transportable Calibration
Plus Series sensors have transportable calibration capabilities. Sensor may
be calibrated in the laboratory and then installed in the field without any
special tools or adjustments -- and without declassifying the area. When a
new sensor is installed in the unit, the transmitter automatically adjusts to
recognize the new gas type and range and adjusts the transmitter system
function accordingly. The new sensor information is also sent to the
SensAlert 4channel controller (if one is connected). The SensAlert 4channel
controller “self-configures” to accommodate for the newly installed sensor.
1.2.5 Unrestricted Operation in Hazardous Areas
Magnetic switches on the front panel allow calibrations to be performed
without opening the transmitter enclosure. This is especially useful when the
area is classified as potentially hazardous and declassification is required to
open the transmitter.
The only tool required to perform a calibration is the magnetic screwdriver
provided with the transmitter (part number 7013201-1). The integral LCD
readout has been calibrated at the factory for direct reading in ppm, %vol, or
%LEL. Field calibration consists of calibrating the sensor output to the
applied calibration gas.

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12 Sensidyne Document No. 360-0152-01 (Rev F0)
1.2.6 Predictive Sensor Failure
Predictive Sensor Failure is a unique feature that provides the user with an
early warning of the pending expiration of a sensor. When the sensor has
less than 10% of its life remaining, a warning appears on the main display,
and can be assigned to activate other warning indicators.
1.3 Optional Features
1.3.1 Test-On-Demand™
The Test On-Demand™ (TOD) feature allows the performance of the system
to be checked quickly, easily and often. When activated, either manually, at
programmed times or by remote control, the T-O-D™ generator produces a
small gas output that is intended to produce a response from the gas sensor
to verify that the sensor is responsive to gas. This is intended to be a “bump”
test and is not to replace recommended calibration procedures. The intended
purpose of this feature is to provide a level of system operating assurance by
providing the user with the ability to test the sensor on demand. This feature
can be activated via the display screen, via a communications link, or
automatically using the Test Date/Time menu.
1.3.2 Remote Sensor Operation
The sensor is mounted in the sensor interface assembly that can be located
up to 100 feet from the display housing. The sensor interface is intrinsically
safe, allowing it be connected without special cable or conduit regardless of
combustible gas [Zone 0 with Toxic Sensors, Zone 1 with Catalytic Bead and
Infrared Combustible Sensors].
1.3.3 Relay Outputs
An optional Relay Board can be installed that provides three additional relays
for use with horns, strobes, and other external devices.
1.3.4 Communication Options
An optional Communications Board can be installed for RS-485 with Modbus,
or HART protocol.

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Sensidyne Document No. 360-0152-01 (Rev F0) 13
1.4 Components
1.4.1 Sensor Interface Assembly
The sensor interface assembly contains the electronics that operate the
sensor and houses the Plus Series sensor and the Test-on-Demand™ cell.
The electronics are intrinsically safe, allowing you to hot swap the sensor or
T-O-D cell in hazardous areas when the transmitter is under power.
1.4.2 Plus Series sensor
The Plus Series sensor comes in a variety of sensor technologies for
detecting toxic, oxygen, and combustible gases. The Plus Series sensor is
discussed in greater detail in Section 1.4.8. The sensor gasket seals the
sensor inside the sensor holder.
1.4.3 Test-on-Demand™
The unique Test-on-Demand™ (T-O-D™) gas generating cell (optional)
provides a method for periodic sensor testing (programmed or manually
activated) ensuring the sensor reacts to gas. The T-O-D gasket seals the
generating cell inside the sensor holder.
1.4.4 Sensor Holder
The sensor and T-O-D gas generating cell are housed in the Sensor Holder.
The sensor holder is easily installed and removed via the retaining ring
located on the sensor interface assembly.
1.4.5 Rainshield
The optional rainshield shields the sensor and T-O-D cell from liquid intrusion
due to rain, splash-back, or unintentional hosing. The rainshield is IP56
(Ingress Protection) rated.
1.4.6 Calibration Plug Assembly
The calibration plug assembly secures into the sensor shield and replaces
the rainshield while the transmitter is being calibrated.

SensAlert ASI – Advanced Safety Integrity Gas Transmitter
14 Sensidyne Document No. 360-0152-01 (Rev F0)
Figure 2-1a
SensAlert ASI Transmitter Standard Horizontal Mount

SensAlert ASI – Advanced Safety Integrity Gas Transmitter
Sensidyne Document No. 360-0152-01 (Rev F0) 15
Figure 2-2b
SensAlert ASI Transmitter Standard Vertical Mount

SensAlert ASI – Advanced Safety Integrity Gas Transmitter
16 Sensidyne Document No. 360-0152-01 (Rev F0)
Figure 2-3c
SensAlert ASI Transmitter for two option cards

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Sensidyne Document No. 360-0152-01 (Rev F0) 17
1.4.7 Liquid Crystal Display
The Liquid Crystal display has a backlight feature for all 3-wire transmitters. The backlight feature is not
available on 2-wire transmitters.
(1) Gas Concentration
The gas concentration is displayed in large
characters, along with the appropriate unit of
measure (ppm, %vol, %LEL) depending on the
sensor installed.
(2) Gas Type & Maximum Sensor Range
Displays the chemical symbol or abbreviated name
of the toxic gas or combustible gas sensor installed
in the transmitter. The range of the sensor is also
displayed.
(3) Local Date and Time
Local date and time. The time is displayed in 24
hour format. The date format is user definable.
(4) Transmitter Name/ID
User-defined field for transmitter identification.
(5) ACK Control (Switch)
ACK represents one of the four magnetic switches
used to operate the transmitter menu system. ACK
is used to confirm operations or select a menu item. Activating ACK from the Main Display brings up a
menu listing the operations that can be performed on the transmitter.
(6) << (Go Back)
This switch is the opposite of ACK. If you change your mind while performing any operation, activating
<< will take you back to the previous operation.
(7) ▲and ▼
The ▲ and ▼ control arrows are used to scroll up or down a list of items. These controls are also used to
increase or decrease a value (such as an alarm setpoint).
Holding the wand near the control (switch) causes the displayed value to either increase or decrease
automatically.
(8) LEDs 1-4
The transmitter display has four LEDs that light up when there is an alarm or fault condition occurring.
Each LED is normally associated with their respectively numbered relays (i.e., LED 1 with Relay 1, LED 2
with Relay 2, etc.). LED 1 (associated with Relay 1) is factory set as the “fault” LED/Relay and can be
found on all 3-wire non-I.S. transmitters. LED 2 (Relay 2), LED 3 (Relay 3), and LED 4
(Relay 4) are associated with relays on the optional relay board.
Note: There are no relays on 2-Wire or 3-wire, I.S. transmitters.
Also, when the magnetic wand is brought close to a magnetic switch the LED associated with that switch
lights up, confirming that contact has been made between the wand and the switch.
(Note: LEDs do not light up under any circumstances on 2-wire transmitters.)
(9) This line is used to display important system messages and warnings.

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18 Sensidyne Document No. 360-0152-01 (Rev F0)
1.4.8 Sensor Types
NOTE
DO NOT attempt to install sensors other than Plus Series sensors into the SensAlert ASI Transmitter.
ONLY SENSORS LABELED AS PLUS SERIES WILL WORK IN THE SENSALERT ASI TRANSMITTER.
A complete list of available sensors, sensor specifications, interferents, and calibration equipment
can be found by contacting Sensidyne or on the sensor specification sheet.
Sensors should be hot-swapped only when the Normal Operation Mode screen is displayed.
Sensor Types
Infrared
Infrared sensors are used to detect combustible gases and Carbon Dioxide.
Infrared sensors cannot be used in 2-wire transmitters.
Sealed Electrochemical
Sealed electrochemical sensors are used to detect toxic gases.
Oxygen
Oxygen sensors are used to detect ambient Oxygen levels.
Catalytic Bead Combustible
Catalytic Bead sensors are used to detect combustible gases. Catalytic bead
sensors cannot be used in 2-wire transmitters.