Industrial Scientific TANGO TX2 User manual

Product
Manual
The Essential Guide for
Safety Teams and
Workers
Edition: 3
April 30, 2021
Part Number: 17160218-1

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Industrial Scientific Corporation, Pittsburgh, PA USA
Industrial Scientific Co., Ltd. Shanghai, China
© 2021 Industrial Scientific Corporation
All rights reserved. Published 2021.
Revision 2
www.indsci.com/tango-tx2

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Contents
General Information .......................................................................................................................................................................... 1
Certifications ................................................................................................................................................................................. 1
Warnings and Cautionary Statements .......................................................................................................................................... 1
Getting Started.................................................................................................................................................................................. 3
Gas Monitoring and Sensors ........................................................................................................................................................ 3
User Interface (UI) ........................................................................................................................................................................ 3
Gas-reading display behavior ................................................................................................................................................... 4
Preparing the Tango TX2 for First Use ......................................................................................................................................... 4
Using the Tango TX2 ........................................................................................................................................................................ 5
Power On and Start-up ................................................................................................................................................................. 5
General Operation ........................................................................................................................................................................ 5
Alarms, Warnings, and Notifications ............................................................................................................................................. 6
Wearing the Instrument................................................................................................................................................................. 8
Maintenance Recommendations .................................................................................................................................................. 8
Features and Settings..................................................................................................................................................................... 11
Overview ..................................................................................................................................................................................... 11
Settings Topics ........................................................................................................................................................................... 11
Administrative features ........................................................................................................................................................... 12
Gas-alarm features ................................................................................................................................................................. 12
Worker-access features .......................................................................................................................................................... 13
Maintenance features ............................................................................................................................................................. 13
Settings-mode Access ................................................................................................................................................................ 14
Settings-mode UI ........................................................................................................................................................................ 14
Specifications and Compatibilities .................................................................................................................................................. 21
Instrument ................................................................................................................................................................................... 21
Sensors....................................................................................................................................................................................... 22
Power.......................................................................................................................................................................................... 26
Dock............................................................................................................................................................................................ 26
Maintenance ................................................................................................................................................................................... 27
Docking Station for Maintenance ................................................................................................................................................ 27
Manual Processes for Maintenance............................................................................................................................................ 27
Process At-a-glance................................................................................................................................................................ 27
Cleaning the Instrument Exterior ................................................................................................................................................ 30
Service and Warranty ..................................................................................................................................................................... 31
Service ........................................................................................................................................................................................ 31
Supplies .................................................................................................................................................................................. 31
Tango TX2 illustrated.............................................................................................................................................................. 31
Service tasks........................................................................................................................................................................... 34

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Warranty Policy........................................................................................................................................................................... 37
Limitation of Liability................................................................................................................................................................ 38
Appendix A...................................................................................................................................................................................... 39
Maintenance Definitions.............................................................................................................................................................. 39
Bump Test (or "functional test") .............................................................................................................................................. 39
Zero......................................................................................................................................................................................... 39
Calibration............................................................................................................................................................................... 39
Appendix B...................................................................................................................................................................................... 40
Supplemental Information about Sensors and Gases ................................................................................................................ 40
Appendix C ..................................................................................................................................................................................... 41
Marking Requirements................................................................................................................................................................ 41
Contact Information......................................................................................................................................................................... 42

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Tables and Figures
Table 1.1 Hazardous-area certifications ........................................................................................................................................... 1
Table 1.2 Warnings and cautionary statements................................................................................................................................ 2
Table 2.1 Compatible gas sensors ................................................................................................................................................... 3
Figure 2.1 User interface .................................................................................................................................................................. 4
Figure 3.1 Worker accessible options............................................................................................................................................... 6
Figure 3.2 Alarms and their related display symbols ........................................................................................................................ 7
Figure 3.3 Warnings and their related display symbols .................................................................................................................... 8
Table 3.1 Recommended frequency for instrument maintenance .................................................................................................... 8
Table 4.1 Administrative features and related settings................................................................................................................... 12
Table 4.2 Gas-alarm features and related settings......................................................................................................................... 12
Table 4.3 Worker-access features and related settings.................................................................................................................. 13
Table 4.4 Maintenance features and related settings ..................................................................................................................... 13
Figure 4.1 Settings display-screen sample ..................................................................................................................................... 14
Figure 4.2 Settings menu................................................................................................................................................................ 14
Table 5.1 Instrument specifications ................................................................................................................................................ 21
Table 5.2 Sensor specifications, Carbon Monoxide........................................................................................................................ 22
Table 5.3 Sensor specifications, Carbon Monoxide with low Hydrogen cross-sensitivity............................................................... 23
Table 5.4 Sensor specifications, Hydrogen Sulfide ........................................................................................................................ 24
Table 5.5 Sensor specifications, Nitrogen Dioxide ......................................................................................................................... 25
Table 5.6 Sensor specifications, Sulfur Dioxide.............................................................................................................................. 26
Figure 6.1 Instruction for manually performed maintenance........................................................................................................... 28
Illustration 7.1 Disassembled Tango TX2 and case-top assembly ................................................................................................. 32
Table 7.1 Tango TX2 parts list........................................................................................................................................................ 33
Table B.1 Sensor cross-sensitivity guidelines (percent response) ................................................................................................. 40
Table C.1 ATEX and IECEx marking requirements ........................................................................................................................ 41

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General Information
Certifications
Warnings and Cautionary Statements
Certifications
Certifications for the Tango®TX2, at the time of this document's publication, are listed below.
To determine the hazardous-area classifications for which a particular instrument is certified, refer to its
label or the instrument order.
Table 1.1 Hazardous-area certifications
Directive or CB
Area Classification
Standards
ATEXa
Ex ia I Ma
Ex ia IIC T4 Ga
Equipment Group and Category: I M1 and II 1G
EN 60079-0: 2012
EN 60079-11: 2012
EN 50303: 2000
IECExb
Ex ia I Ma
Ex ia IIC T4 Ga
IEC 60079-0: 2011
IEC 60079-11: 2011
UL (C-US)c
Class I, Groups A, B, C, and D; Class II, Groups E,
F, and G; T4; Ex ia
Class I, Zone 0, AEx ia IIC T4
UL 913 8th Ed.
UL 60079-0 6th Ed.
UL 60079-11 6th Ed.
CSA C22.2 No. 157
aThe EC type examination certificate is DEMKO 12 ATEX 1209126 with marking code Ex ia I Ma and Ex ia IIC T4 Ga for equipment group
and category II 1G and I M1.
aThe TANGO TX2 complies with relevant provisions of European ATEX directive 2014/34/EU and EMC directive 2014/30/EU.
aThe TANGO TX2 is constructed with reference to published standards of LVD directive 2014/35/EU, to eliminate electrical risks and fulfill
1.2.7 of ANNEX II of directive 2014/34/EU.
bThe IECEx examination certificate is IECEx UL 12.0041 with marking code Ex ia IIC T4 Ga and Ex ia I Ma for hazardous locations with an
ambient temperature range of -40°C ≤ Ta ≤ +50°C (-40F° ≤ Ta ≤ 122°F).
cThe TANGO TX2 is UL certified according to the National Electrical Code and Canadian Electrical Code for use in Class I, Division 1
hazardous locations with an ambient temperature range of -40°C ≤ Ta ≤ +50°C (-40F° ≤ Ta ≤ 122°F).
Note: See also Marking Requirements for ATEX and IECEx.
Warnings and Cautionary Statements
IMPORTANT: Read and understand this Product Manual before operating the instrument.

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Table 1.2 Warnings and cautionary statements
For maximum safety and optimal performance, read and understand the manual before operating or servicing the
unit. Failure to perform certain procedures or note certain conditions may impair the performance of this product.
For safety reasons, this equipment must be operated and serviced by qualified personnel only.
Substitution of components may impair intrinsic safety and may cause an unsafe condition.
Do not replace battery in hazardous locations. Only certified for use with one (1) Tadiran TL-5955 battery cell.
Sensor openings and water barriers must be kept clean. Obstruction of the sensor openings or contamination of the
water barriers may cause readings to be lower than actual gas concentrations.
Service the unit, use its communication port, and change its battery cell only in nonhazardous locations. Not for use
in oxygen-enriched atmospheres.
Contact your service representative immediately if you suspect that the unit is working abnormally.

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Getting Started
Gas Monitoring and Sensors
User Interface (UI)
Preparing the Tango TX2 for First Use
Gas Monitoring and Sensors
Measuring gas at two-second intervals, the Tango® TX2 is a portable, two-gas diffusion monitor
(instrument) for personal protection. See “Instrument specifications”.
Tango TX2 is compatible with the Industrial Scientific sensors listed below and supports only a two-sensor
configuration. The instrument does not support a single-sensor configuration.
Sensors are customer replaceable. To install new or replacement sensors, see “Sensor replacement”.
Table 2.1 Compatible gas sensors
Gas sensor
Display screen
symbol
Part number
Details
Carbon Monoxide (CO)
17160204
specifications
Carbon Monoxide with low Hydrogen cross-
sensitivity (CO/H2Low)
17160208
specifications
Hydrogen Sulfide (H2S)
17160207
specifications
Nitrogen Dioxide (NO2)
17160205
specifications
Sulfur Dioxide (SO2)
17160206
specifications
Data are saved every ten seconds and stored to the instrument data log. The data log has these
characteristics:
•Capacity for approximately three months of data for a unit that is on 24 hours a day.
•Date- and time-stamped entries for 60 alarm events, 30 error events, and up to 250 manual calibration
procedures and bump tests.
•As new data are logged to memory, the oldest data are overwritten.
•Downloaded on docking in a compatible docking station from Industrial Scientific.
User Interface (UI)
As illustrated below, Tango TX2 UI comprises instrument buttons, lights, sounds, and vibration along with
display-screen characters and symbols. The home-screen illustration indicates how gas readings generally

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appear during operation. Likewise, the alarm-screen example shows how the display generally appears
when a gas event has caused an instrument alarm; sound, light, and vibration signals would also occur
based on the alarm type and some settings.
Figure 2.1 User interface
Instrument
Display screen (samples)
Home screen
Operating
Lights
H2S
Gas sensor
5.1 PPM
Gas reading and unit of
measure
Alarm screen
Power button
Operating
Speaker
High alarm
Enter button
H2S
Alarm-causing gas sensor
Display screen
20.0
PPM
Gas reading and unit of
measure
Vibration (not
shown)
Gas-reading display behavior
The safety team sets how the instrument—when not in alarm—will display gas readings. As noted in the
setting, “Gas reading display”, the options are:
•Display readings only for sensor 1.
•Display readings only for sensor 2.
•Alternately display readings for one sensor, then the other using a 3-second interval.
When a gas sensor causes an instrument alarm, the instrument will automatically display gas readings
using the alternating pattern. When the alarm-causing condition is no longer detected, the readings display
will revert to its set behavior.
Preparing the Tango TX2 for First Use
There are three steps to prepare the Tango TX2 for first use.
1. Review instrument settings and adjust as needed. See the chapter, “Features and Settings.”
2. Calibrate the instrument. See the chapter, “Maintenance”.
3. Perform a bump test. See the chapter, “Maintenance”.

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Using the Tango TX2
Power On and Start-up
General Operation
Alarms, Warnings, and Notifications
Wearing the Instrument
Maintenance Recommendations
Power On and Start-up
To power on the instrument, press and hold the power button ( ) for three seconds, then release.
During start-up, if any diagnostics fail, an error will display; otherwise, all the audio, visual, and vibration
indicators will turn on then off. This will be followed by a series of display screens, which based on settings,
can include any of the following:
•Visual test screen
•Version information
•Calibration date information
•Calibration gas settings
•Gas alert settings
•Low alarm gas settings
•High alarm gas settings
•TWA alarm settings
•STEL alarm settings
•Gas readings (home screen)
General Operation
During operation use the buttons as follows:
•To scroll from display to display, repeatedly press power .
•To perform a displayed task or maintenance option, press enter .
Depending on settings, workers may have access to any of the information and options presented in
Figure 3.1.

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Figure 3.1 Worker accessible options
Display screen
Information and options
Time of day; 24-hour clock used.
Calibration due information; format shown here is next calibration date
( ▲).
Optionally start the zero-calibration process ( ).
Optionally start a bump test ( ).
View peak readings; optionally clear and reset the reading ( ).
View TWA readings; optionally clear a TWA reading, which also resets
its time interval ( ).
View STEL readings; optionally clear a STEL reading, which also
resets its time interval ( ).
Alarms, Warnings, and Notifications
Different events can produce the same or similar light, noise, or vibration patterns. For example, a high
alarm pattern can signal a dangerously high gas reading, a critically low battery, or another event. Each
unique event is distinguished by the symbols and characters on the display screen.
Take seriously all alarms, warnings, and notifications, and respond according to company policy.

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Alarms
Alarms notify the worker of danger. The high alarm is fast in pace with red lights and steady sound. By
comparison, the low alarm is slower with blue lights, red lights, and steady sound. Alarms persist until the
alarm-causing condition is no longer detected.
Figure 3.2 Alarms and their related display symbols
High-alarm events
and
and STEL
High-alarm gas
Over-range gas
STEL
!
and F
Critical low battery
System error (888)a
Sensor failure
Low-alarm events
and TWA
Low-alarm gas
TWA
—
aVariations: 483 for sensor error; 408 for no sensor installed.
Warnings
Warnings notify the worker of a condition that needs attention.
Some warnings precede a related alarm. For example, a low-battery warning occurs before the critical low-
battery alarm.
Warnings turn on and off repeatedly. The more urgent the warning, the shorter the time between on-off
occurrences; i.e., a warning that repeats every two seconds is more urgent than a warning that repeats
every 30 seconds. Warnings persist until the causing issue is resolved.

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Figure 3.3 Warnings and their related display symbols
Calibration due
Bump test due
Dock due
Gas alert
Low battery
Notifications
Indicators notify of a status. Each occurs at a regular frequency and at a pace that is slower than a warning
or alarm. For example, a confidence indicator can be enabled to occur every 90 seconds to flash a blue
light, emit a chirp, or both.
Wearing the Instrument
Based on the U.S. Department of Labor's Occupational Safety and Health Administration (OSHA), it is
recommended that the instrument be worn within a 25.4 cm (10") radius of the breathing zone. Use this
information in combination with company safety policy and applicable directives or recommendations from
relevant regulatory and other groups.
Maintenance Recommendations
Provided below are Industrial Scientific minimum-frequency recommendations for maintenance procedures.
These recommendations support instrument performance and are based on field data, safe work
procedures, industry best practices, and regulatory standards. Use them in combination with company
safety policy, applicable directives and recommendations of regulatory groups, environmental conditions,
operating conditions, instrument use patterns and exposure to gas, and other factors.
For maintenance instructions, see the chapter, “Maintenance.”
For definitions of key procedures, see “Appendix A, Maintenance Definitions.”
Table 3.1 Recommended frequency for instrument maintenance
Procedure
Recommended minimum frequency
Settings
Before first use, when an installed sensor is replaced, and as needed.
Calibrationa
Before first use and monthly thereafter.
Bump test
Before first use and prior to each day’s use thereafter.
Docking
When a dock due warning occurs and as needed for periodic maintenance and upgrades
from Industrial Scientific.
Exterior case cleaning
As needed.
Self-testb
—
aBetween regular calibration procedures, Industrial Scientific also recommends calibration immediately following each of these
occurrences: the installation of a new (or replacement) sensor; the unit falls, is dropped, or experiences another significant impact; is
exposed to water; fails a bump test; has been exposed to an over-range (positive or negative) gas concentration.

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bThe instrument performs a self-test during power on. If set to always-on, the instrument will perform a self-test every 24 hours. The self-
test can be completed on demand by the worker.
Note: The use of calibration gases not provided by Industrial Scientific may void product warranties and limit potential liability claims.

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Features and Settings
Overview
Settings Topics
Settings-mode Access
Setting-mode
Overview
Use Tango® TX2 features and their related settings to support your company’s safety policy and to shape
in-field worker experience with the instrument.
When working in settings mode, apply the guidelines stated below.
•Only qualified, safety-team personnel should access the instrument’s settings mode and adjust
settings.
•Consider the air-sampling environment to help you make good setting choices.
•Be knowledgeable of company policies as they apply to setting choices.
•As issued by regulatory agencies and government or industry groups, be knowledgeable of regulations,
laws, and guidelines for their effects on setting choices.
IMPORTANT: Settings that can be adjusted manually through the instrument are described in this chapter;
these and other settings can also be adjusted through iNet® Control. Any setting changes made manually
to the instrument will be overridden when the instrument is docked.
Settings Topics
You can read about instrument features as grouped in the four topics listed below. Each topic provides
some information about why you might want to use certain features, providing reference to related settings.
•administrative
•gas alarms
•worker access
•maintenance
Alternately, you can skip to instruction for how to access and work in settings mode. Figure 4.2
Settings menu lists settings in the order you will encounter them and provides details about the available
options.

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Administrative features
Use administrative features to set readability aspects of the worker’s display screen, along with security,
support for data-log integrity, and other general features.
Table 4.1 Administrative features and related settings
Feature
Related settings
Determine the gas-reading format a worker will see on the display screen.
With numeric format, the worker to see the reading and with text, a notation
(e.g. OK).
Display style (numeric or text)
Language
Deadband
Use a valid security code to restrict worker access to settings mode, guarding
against unintended changes to instrument settings. A security code also
supports always-on functionality.
Prevent (or permit) worker ability to power off the instrument when it is in
alarm.
Security code
Always on
Shutdown in alarm
For in-field confidence a worker is instrument equipped, make use of the
visual-audible indicator.
Confidence indicator
Support data-log accuracy with correct date and time settings.
Date
Time
Gas-alarm features
Set the gas-concentration readings that will cause gas alerts, warnings, and alarms. Optionally use features
to latch instrument alarms and set functionality for TWA and STEL.
Table 4.2 Gas-alarm features and related settings
Feature
Related settings
Set the minimum gas-concentration reading required to signal workers of
these alarms:
•low-alarm gas event
•high-alarm gas event
Alternately, set low-alarm and high-alarm values based on country or
world region. Note: Because these alarms can be edited separately and
through the country-of-origin, the instrument applies this over-ride: the
last saved setting over-rides previous settings.
Low-alarm gas setting
High-alarm gas setting
Alternately, Country of origin
Use (or don’t use) the optional gas-alert feature.
If used, set the minimum gas-concentration reading required to alert
the worker of readings that may be approaching alarm level.
Gas alert feature
Gas alert setting
Use (or don’t use) the instrument’s optional STEL and TWA features.
If used, set the minimum sum of gas required to alarm the worker.
TWA and STEL multi-option
STEL alarm setting
TWA alarm setting
Use the optional alarm latch to sustain alarm signals until they are
manually turned off by the worker.
Alarm latch

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Table 4.2 Gas-alarm features and related settings
Feature
Related settings
Use the optional vibration alarm signals, which can be helpful in noisy
environments.
Vibration alarm
Worker-access features
Set worker accessibility for operation-mode options (e.g., clear peak readings). Set warnings to notify
workers of maintenance due such as docking.
Table 4.3 Worker-access features and related settings
Feature
Related settings
If the optional STEL or TWA feature is set for operation, their readings can be
set for worker visibility and reset.
Operation-mode TWA
Operation-mode STEL
There are three optional maintenance warnings that are used to notify the
worker about needed maintenance (e.g., calibration).
Functionality and signal type are separately set for each warning.
Enabled maintenance warnings share a single setting for warning interval
(e.g., every 30 minutes).
Bump-test-due warning
Calibration-due warning
Dock-due warning
Maintenance warning interval
Workers can be given or denied operation-mode access to manually perform
maintenance. Worker access is separately set for each task: bump test, zero,
or calibration.
Operation-mode bump test
Operation-mode zero
Operation-mode calibration
Set the display style for calibration-date information (next or last).
Calibration date
Maintenance features
Use these features to define the instrument’s maintenance routine, supporting instrument health and
maintenance-due warnings for workers.
Table 4.4 Maintenance features and related settings
Feature
Related settings
Set the dock-due interval to support regular synchronization with iNet and
download of instrument enhancements from Industrial Scientific.
Dock-due interval
Set the instrument to alarm or not alarm while docked.
Alarms while docked
Set these bump test parameters:
The interval at which the instrument is to be bump tested.
The percentage of calibration gas the instrument must read for a bump
test.
The response time needed for a bump test—the number of seconds within
which the sensor will respond to the calibration gas.
Bump test interval
Bump test percentage
Bump test response time
Set these zero and calibration parameters:
The interval at which the instrument is to be calibrated.
The gas type and concentration needed for calibration.
Calibration due interval
Calibration gas

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Settings-mode Access
To access settings mode, power on the instrument and during startup:
1. Press and hold both buttons ( and ) at the same time.
2. If the unit is security-code protected, you will be prompted to edit ( ) the value to match the three-digit
code; then, press .
Settings-mode UI
The settings-mode screenshot shown below displays the tool symbol ( ), which indicates the instrument is
in settings mode. The remaining UI elements indicate a high alarm is set to occur when the H2Sgas
reading reaches 20.0 ppm or higher.
Figure 4.1 Settings display-screen sample
Settings mode ( ): High alarm setting for H2S
Symbol location
You will encounter each setting in the order shown Figure 4.2. To scroll the menu, repeatedly press the
power button ( ). When you want to change a setting, use the buttons as follows:
Press until the desired setting option displays.
Press to save the setting.
IMPORTANT: When you set something to “disabled”, it will not be operational.
If more than 30 seconds pass after a button is pressed, settings mode is exited. If this occurs, simply power
off the instrument; then, power on and access settings during startup.
Figure 4.2 Settings menu
Display screen
Setting and options
Initiate zero
Optionally zero the sensors ( ).
Low-alarm gas setting (H2S shown)
Choose ( ) the minimum gas-reading concentration that will cause a
low alarm for the displayed gas type (H2S shown here). Save ( ) the
setting. You will be prompted to repeat the same setting sequence but
for the other installed gas sensor.
Value parameters:
•within the sensor’s measurement range
•higher than the sensor’s gas-alert setting
•lower than the sensors high-alarm gas setting