TanGO TX1 User manual
Product
Manual
The Essential Guide for
Safety Teams and
Instrument Operators
Edition: 11
December 19, 2023
Part Number: 17154993-1
i
Contents
Contents.............................................................................................................................................................. i
Tables and Figures ............................................................................................................................................iii
Certifications ......................................................................................................................................................1
Product Overview............................................................................................................................................... 2
DualSense Technology................................................................................................................................................................. 3
Multiplane Sensor Ports and Data Memory .................................................................................................................................. 3
Dual-mode Operating System....................................................................................................................................................... 3
Gas alert and alarm features ........................................................................................................................................................ 3
Other key features ........................................................................................................................................................................ 4
Product Specifications .......................................................................................................................................4
Introduction ...................................................................................................................................................... 13
Procedures....................................................................................................................................................... 13
Recommendations...........................................................................................................................................14
Instrument storage...................................................................................................................................................................... 15
First Use...................................................................................................................................................................................... 15
Wearing the Instrument............................................................................................................................................................... 15
Cleaning the instrument exterior................................................................................................................................................. 15
Unpacking the Instrument ................................................................................................................................ 17
Display Overview .............................................................................................................................................19
Start-up and Shutdown ....................................................................................................................................21
Configuration.................................................................................................................................................... 23
Operation ......................................................................................................................................................... 35
Zero, Calibration, Bump Test, Response and Recovery Time Testing ............................................................37
Overview .......................................................................................................................................................... 43
Alarms.............................................................................................................................................................. 43
Warnings and failures ......................................................................................................................................44
Service Instructions.......................................................................................................................................... 47
Supplies ...................................................................................................................................................................................... 47
Tango TX1 Three-dimensional Diagrams................................................................................................................................... 48
Service Tasks ............................................................................................................................................................................. 50
Warranty Policy................................................................................................................................................ 54
Limitation of Liability.................................................................................................................................................................... 54
Appendix A....................................................................................................................................................... 55
Supplemental Information about Sensors and Gases ................................................................................................................ 55
Marking Requirements..................................................................................................................................... 56
ii
Workplace Atmosphere Gas Performance....................................................................................................... 56
Contact Information.......................................................................................................................................... 57
iii
Tables and Figures
Table 1.1 Certifications ..................................................................................................................................................................... 1
Table 1.2 Warnings and cautionary statements................................................................................................................................ 2
Table 1.3 Sensor-type options.......................................................................................................................................................... 3
Table 1.4 Instrument specifications .................................................................................................................................................. 4
Table 1.5 Sensor specifications........................................................................................................................................................ 6
Table 1.5 Sensor specifications........................................................................................................................................................ 7
Table 1.5 Sensor specifications........................................................................................................................................................ 8
Table 2.1 Industrial Scientific recommended practices, Tango TX1............................................................................................... 14
Figure 2.1 Securing the garment clip.............................................................................................................................................. 15
Table 3.1 Package contents ........................................................................................................................................................... 17
Figure 3.1 Hardware overview........................................................................................................................................................ 18
Table 3.2 Display screens, indicators, and abbreviations............................................................................................................... 19
Table 3.3 Start-up and shutdown.................................................................................................................................................... 21
Table 4.1 Configuration instructions ............................................................................................................................................... 24
Table 4.2 Operation instructions..................................................................................................................................................... 35
Table 4.3 Zero, calibration, bump test, response and recovery time testing .................................................................................. 37
Table 5.1 Alarm events................................................................................................................................................................... 44
Table 5.2 Warning events............................................................................................................................................................... 45
Table 5.3 Warning and failure screens ........................................................................................................................................... 45
Figure 6.1 Disassembled Tango TX1 ............................................................................................................................................. 48
Figure 6.2 Disassembled Tango TX1 case top assembly............................................................................................................... 48
Table 6.1 Tango TX1 parts list........................................................................................................................................................ 49
Table 6.2 Service tasks................................................................................................................................................................... 50
Table A.2 ATEX and IECEx marking requirements ........................................................................................................................ 56
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General Information
Certifications
Product Overview
Product Specifications
Certifications
Certifications for the Tango®TX1, at the time of this document's publication, are listed below in Table 1.1.
To determine the hazardous-area classifications for which an instrument is certified, refer to its label or the
instrument order.
Table 1.1 Certifications
Directive or CB
Area Classifications
Approved Temperature Range
Americas
CSA
Ex ia IIC T4; Class 1; Groups A, B, C, D; T4
-40 °C to +50 °C (-40 °F to +122 °F)
IECEx
Ex ia I Ma
Ex ia IIC T4 Ga
-40 °C to +50 °C (-40 °F to +122 °F)
INMETRO
Ex ia IIC T4 Ga
Ex ia I Ma
-40 °C to +50 °C (-40 °F to +122 °F)
UL
Class I, Zone 0, AEx ia IIC T4
Class II, Groups E, F, G
-40 °C to +50 °C (-40 °F to +122 °F)
Europe and Russia
ATEXa
Ex ia I Ma
Ex ia IIC T4 Ga
Equipment Groups and Categories: I M1 and II 1G
-40 °C to +50 °C (-40 °F to +122 °F)
GOST EAC
PO Ex ia I X
0 Ex ia IIC T4 X
-40 °C to +50 °C (-40 °F to +122 °F)
GOST-R, -UA
Metrology Pattern Approval
-20 °C to +50 °C (-4 °F to +122 °F)
UKExb
Ex ia I Ma
Ex ia IIC T4 Ga
Equipment Group and Category: I M1 and II 1G
-40 °C to +50 °C (-40 °F to +122 °F)
Asia and Pacific
China Ex
Ex ia IIC T4 Ga
-20 °C to +50 °C (-4 °F to +122 °F)
2
Table 1.1 Certifications
Directive or CB
Area Classifications
Approved Temperature Range
China CPA
Metrology Pattern Approval
-20 °C ≤ Ta ≤ +50 °C (-4 °F ≤ Ta ≤ +122 °F)
aThe TANGO TX1 complies with relevant provisions of European ATEX directive 2014/34/EU and EMC directive 2014/30/EU.
bThe TANGO TX1 complies with relevant harmonized standards and legislation provisions for UK SI 2016 No. 1107, No. 1091, UK SI 2012 No. 3032.
Note: See also Marking Requirements for ATEX and IECEx in the Appendix.
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 Tadiran TL-5955 battery cell.
Obstruction of sensor openings–due to dust, dirt, water, or another cause–can inhibit the unit’s ability to
measure gas concentrations accurately. When this occurs, readings may appear lower than the actual gas
concentration. Keep sensor openings clean, dry, and properly exposed to the ambient air.
Obstructed, contaminated, or damaged sensor water barriers (or their gaskets) can inhibit the unit’s ability to
measure gas concentrations accurately. When this occurs, readings may appear lower than the actual gas
concentration. Replace the sensor water barriers and gaskets as needed (see “Service” for instructions).
Service the unit, use its communications 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.
Do not use in oxygen-enriched atmospheres. Explosion safety is certified only up to 21% Oxygen.
Sudden changes in atmospheric pressure, temperature, or humidity may cause temporary fluctuations in gas
readings.
Between regular calibration procedures, Industrial Scientific also recommends that calibration be performed
following each of these incidences: the unit falls, is dropped, or experiences another significant impact; is
exposed to water; fails a bump test; or has been repeatedly exposed to an over-range (positive or negative) gas
concentration. Calibration is also recommended after the installation of a new (or replacement) sensor.
Calibration gases contain high concentrations of toxic gases that can pose risks to human health. To
understand the potential hazards associated with calibration gas, please consult the Safety Data Sheets (SDS)
available on the Industrial Scientific website. http://www.indsci.com/en/explore/calibration-gas-and-reference-
chart
Make sure to check that the time and date are correct after replacing the battery. If necessary, you can refer to
Table 4.1 for instructions on how to set the time and date.
Product Overview
The Tango TX1 is a portable, long-life, single-gas monitor (instrument) for personal protection. It is a
diffusion instrument for use in detecting and measuring gas present in open space. Based on the
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customer’s order, two redundant sensors–sensors of the same type–are factory installed. Five sensor types
are available (see Table 1.3).
Table 1.3 Sensor-type options
Sensor
Category
Number of sensors
available per
instrument
Sensor type
Toxic Two of the same type Carbon Monoxide (CO) only, Hydrogen Sulfide (H2S) only, Nitrogen Dioxide
(NO2) only,Sulfur Dioxide (SO2) only, or Carbon Monoxide with low
Hydrogen cross-sensitivity (CO/H2Low) only.
Note: See Table 1.5 for sensor specifications.
DUALSENSE TECHNOLOGY
DualSense®Technology enables the use of redundant sensors, two installed sensors of the same type that
are DualSense capable. The DualSense sensors measure the target gas concentration in the atmosphere
at the same time but operate independently of each other. Using a proprietary algorithm, the instrument
processes each sensor's data to display a single gas reading, while maintaining data logs for each sensor
and for the derived DualSense "virtual" sensor.
Each sensor will revert to operate as a single sensor in the event its redundant sensor fails. This allows the
instrument to continue operation until the failed sensor can be replaced.
MULTIPLANE SENSOR PORTS AND DATA MEMORY
The Tango TX1’s multi-plane sensor ports each sample air from three directions; this promotes continuous
operation if one or two planes become obstructed. Since the TX1 measures gas at two second intervals,
and continuously logs data every ten seconds, the data log can store approximately three months of data
for a unit that is on 24 hours a day and has two installed, operational sensors. As the newest data are
logged to memory, the oldest data are overwritten. The data log's date- and time-stamped event log
records and stores event data for 60 alarm events and 30 error events. It also stores the data for up to 250
manual calibration procedures and bump tests. The data log is downloaded when the unit is docked in a
compatible docking station.
DUAL-MODE OPERATING SYSTEM
The instrument has two modes; configuration and operation. When in configuration mode, a unit's settings
can be manually edited. Entry to configuration mode can be security-code protected. When the instrument
is on and is not in configuration mode, it is in operation mode.
GAS ALERT AND ALARM FEATURES
The Tango TX1 has a multisensory (audible, visual, and vibration), multilevel warning and alarm system.
Warnings indicate a service need (calibration due) or an operating condition (confidence indicator). Alarms
indicate potentially hazardous gas concentrations or system faults. The instrument also features a country-
of-origin option that automatically sets the values for the low-gas and high-gas alarm setpoints for each of
five different countries or regions; each alarm setpoint value can also be manually edited.
4
The optional "acknowledgeable gas-alert” feature warns the instrument operator of the presence of gas in
concentrations that may be approaching the instrument’s alarm setpoints. An alert can prompt the
instrument operator to check the display screen for gas readings.
If the measurement of a detected gas in the atmosphere reaches the gas-alert setpoint, which is below the
low-alarm setpoint, the gas alert is activated. The instrument operator can temporarily turn off an alert's
signals for 30 minutes; the instrument will continue to monitor for gas, display readings, and activate any
alarms or other gas alerts that may occur.
After 30 minutes, if the gas reading for the acknowledged alert has remained at (or again reached) the gas-
alert setpoint, the alert signals will be reactivated.
The alarm-latch feature is used to keep an alarm on after the alarm-causing condition no longer exists. This
serves to sustain alarm signals, which can encourage the instrument operator to check the display screen
for gas readings, and to optionally release the alarm latch.
The always-on feature keeps the instrument from being shut down, without first entering the three-digit
security code. This option can be enabled or disabled through the configuration mode.
OTHER KEY FEATURES
The user interface consists of two buttons and an LCD (liquid crystal display). The buttons are used to
power on and power off the instrument, navigate the operation and configuration loops, perform tasks, and
access information. The unit can be set to display select information in English or French.
The unit's garment clip is intended for attachment to a garment; it is not intended for attachment to a belt or
hard hat. An optional AlarmAmpTM is also available; when used, the audible alarm volume is increased by
approximately 10 decibels (dB).
The Tango TX1 is iNet® ready and compatible with the Tango TX1 DSX™ Docking Stations.
Product Specifications
Effective use of the Tango TX1 includes knowledge of the instrument's specifications and its sensor and
battery specifications (see Tables 1.4 through 1.6).
Table 1.4 Instrument specifications
Item
Description
Display
Segment LCD
Keypad buttons
Two buttons
Case materials Case top: polycarbonate with a protective rubber over-mold
Case bottom: conductive polycarbonate
Alarms
Three strobe-emitting visual alarm LEDs (two red; one blue)
95 dB audible alarm at a distance of 10 cm (3.94"), typical
Vibration alarm
Dimensions 99 x 51 x 35 mm (3.9 " x 2.0 " x 1.4 ")
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Table 1.4 Instrument specifications
Item
Description
Weight
126 g (4.4 oz.), typical
Ingress protection
IP66 and IP67
Stabilization time 60 s
Operating temperature range
a
-20 °C to +50 °C (-4 °F to +122 °F)
Operating humidity range
15 to 90% relative humidity (RH) noncondensing (continuous)
Pressure range
1 atm ±0.2 atm (101 kPa ±20 kPa)
Instrument Driftb<1 ppm
Refresh rate
c
2 s
Storaged
Storage temperature range
a
-20 °C to +40 °C (-4 °F to +104 °F)
Recommended 0 °C to 25 °C (32 °F to 77 °F)
Storage pressure range
1 atm ±0.2 atm (101 kPa ±20 kPa)
Storage humidity range
40–70% RH noncondensing
Maximum storage time Up to 12 months at temperature noted above
a
Temperatures outside this range may cause reduced instrument accuracy and affect display and alarm performance.
bThe instrument drift over a period of 30 days for H2S and CO in clean and test gas.
cRefresh rate for the instrument when there is no change in status or gas readings and there is no user input. In case of these changes
the LCD display and buzzer are updated immediately.
dUse the same storage specifications for storing accessories.
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Table 1.5 Sensor specifications
Gas type (abbreviation)
Part Number
Carbon Monoxide (CO)
17155161
17155161Ac
Properties
Category
Toxic
Technology
Electrochemical
DualSense®capable
Yes
Operating conditions
Temperature rangea
-40 to +50 °C
(-40 to +122 °F)
RH rangea
15-90%
Performance
Sensitivity
Measurement range
0–1000 ppm
Measurement resolution
1 ppm
Lower limit
1 ppm
Over-range limit
1000 ppm
Under-range limit
-35 ppm
Dead band
± 3 ppm
Calibration
Calibration gas and concentration/balance gase
100 ppm CO/Air
Calibration gas flow rate
0.5 L/m ± 10%
Accuracyb
Accuracy at time and temperature of calibration
± 5%
Accuracy over sensor’s full temperature range
± 35% (-40 to -11 °C)
± 15% (-10 to 40 °C)
± 35% (41 to 50 °C)
Accuracy over sensor’s full humidity range
± 15%
Response Timed
T50
12 s
T90
20 s
Recovery Timed
T50
12 s
T10
20 s
Warm up Time
40 s
Time to Alarm
-40 °C
≤ 26 s
≥ -10 °C
≤ 15 s
7
Table 1.5 Sensor specifications
Gas type (abbreviation)
Part Number
Carbon Monoxide with low Hydrogen cross-sensitivity
(CO/H2Low)
17155823
Properties
Category
Toxic
Technology
Electrochemical
DualSense®capable
Yes
Operating conditions
Temperature range
a
-20 to +50 °C
(-4 to +122 °F)
RH range
a
15-95%
Performance
Sensitivity
Measurement range
0−1000 ppm
Measurement resolution
1 ppm
Calibration
Calibration gas and concentration/balance gas
e
100 ppm CO/Air
Calibration gas flow rate 0.5 L/m ± 10%
Accuracyb
Accuracy at time and temperature of calibration ± 5% (0–300 ppm)
± 15% (301–1000 ppm)
Accuracy over sensor’s full temperature range
± 15%
Response Timed
T50 9 s
T90 18 s
Recovery Timed
T50 9 s
T10 18 s
8
Table 1.5 Sensor specifications
Gas type (abbreviation)
Part Number
Hydrogen Sulfide (H2S)
17155164
17155164Ac
Properties
Category
Toxic
Technology
Electrochemical
DualSense®capable
Yes
Operating conditions
Temperature rangea
-40 to +50 °C
(-40 to +122 °F)
RH rangea
15–90%
Performance
Sensitivity
Measurement range
0–500 ppm
Measurement resolution
0.1 ppm
Lower limit
0.5 ppm
Over-range limit
500 ppm
Under-range limit
-10 ppm
Dead band
± 0.5 ppm
Calibration
Calibration gas and concentration/balance gase
25 ppm H
2
S/N
2
Calibration gas flow rate
0.5 L/m ± 10%
Accuracyb
Accuracy at time and temperature of calibration
± 5%
Accuracy over sensor’s full temperature range
± 35% (-40 to -11 °C)
± 15% (-10 to 40 °C)
± 35% (41 to 50 °C)
Accuracy over sensor’s full humidity range
± 15%
Response Timed
T50
11 s
T90
19 s
Recovery Timed
T50
11 s
T10
18 s
Warm up Time
40 s
Time to Alarm
-40 °C
≤ 23 s
≥ -10 °C
≤ 16 s
9
Table 1.5 Sensor specifications
Gas type (abbreviation)
Part number
Nitrogen Dioxide (NO2)
17155162
Properties
Category
Toxic
Technology Electrochemical
DualSense®capable
Yes
Operating conditions
Temperature range
a
-40 to +50 °C
(-40 to +122 °F)
RH range
a
15-95%
Performance
Sensitivity
Measurement range 0–150 ppm
Measurement resolution
0.1 ppm
Calibration
Calibration gas and concentration/balance gas
e
25 ppm NO
2
/N
2
Calibration gas flow rate 0.5 L/m ± 10%
Accuracyb
Accuracy at time and temperature of calibration ± 10%
Accuracy over sensor’s full temperature range
± 15%
Response Timed
T50
10 s
T90 30 s
Recovery Timed
T50
10 s
T10
30 s
10
Table 1.5 Sensor specifications
Gas type (abbreviation)
Part number
Sulfur Dioxide (SO2)
17155163
Properties
Category
Toxic
Technology
Electrochemical
DualSense®capable Yes
Operating conditions
Temperature range
a
-20 to +50 °C
(-4 to +122 °F)
RH range
a
15-95%
Performance
Sensitivity
Measurement range 0–150 ppm
Measurement resolution
0.1 ppm
Calibration
Calibration gas and concentration/balance gas
e
5 ppm SO
2
/N
2
Calibration gas flow rate
0.5 L/m ± 10%
Accuracyb
Accuracy at time and temperature of calibration
± 10%
Accuracy over sensor’s full temperature range ± 15%
Response Timed
T50
20 s
T90
80 s
Recovery Timed
T50 20 s
T10 80 s
aDuring continuous operation.
bApply when the instrument is calibrated using the stated calibration gas and concentration; accuracy is equal to the stated percentage
or one unit of resolution, whichever is greater.
cThe sensor is certified for use according to PFG 23 G 002 X for gas performance.
dResponse and recovery times were measured in diffusion mode. Temperatures less than -10C can increase response and recovery
times by as much as 30%. To determine response and recovery times at various temperatures, please see the procedure for
measuring response and recovery times in Table 4.3. Temperatures and/or humidity levels outside the specified operating and storage
ranges may reduce the measurement performance. Therefore, specified performance cannot be predicted or guaranteed.
eThe Relative Humidity (RH) of calibration gas is 0%.
Note: See the “Appendix” for supplemental information about sensor types and gases.
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Table 1.6 Battery properties
Battery Pack
Properties
Tadiran TL 5955
3.6 V Primary Lithium-thionyl chloride
(Li-SOCl2), 1.5AH, 2/3AA
Replaceable
a
Nonrechargeable
Two-year run time depending on operating conditions; the amount of time the unit is in
alarm; and the enablement of unit's confidence indicator, bump test due alert,
calibration due alert, and gas-alert.
aSee "Service Tasks" for instructions. Some restrictions may apply (see "General Information, Table 1.2 Warnings and cautionary statements”).
2
Recommended Practices
Introduction
Procedures
Recommendations
Introduction
Gas detection instruments are potentially life-saving devices. When completed regularly, the procedures
defined below help to maintain proper instrument functionality and enhance operator safety.
Procedures
Configuration. The configuration process allows qualified personnel to review and adjust a unit's settings.
Self-test.The self-test verifies the functionality of the instrument’s memory operations, battery, and each
alarm indicator (audible, visual, and vibration).
Bump Test. Bump testing is a functional test in which an instrument's installed sensors are to be briefly
exposed to (or “bumped” by) calibration gases in concentrations that are greater than the sensors’ low-
alarm setpoints. This will cause the instrument to go into low alarm and will indicate which sensors pass or
fail this basic test for response to gas.
Zero. Zeroing adjusts the sensors’ “baseline” readings, which become the points of comparison for
subsequent gas readings. It is a prerequisite for calibration. During zeroing, the installed sensors are to be
exposed to an air sample from a zero-grade-air cylinder or ambient air that is known to be clean air. If there
are gases in the air sample that are below the lowest alarm level, the instrument will read them as zero; its
task is to read the air sample as clean air. The user's task is to ensure the air is clean.
Calibration.Regular calibration promotes the accurate measurement of gas concentration values. During
calibration, an instrument’s installed sensors are to be exposed to set concentrations of calibration gases.
Based on the sensors’ responses, the instrument will self-adjust to compensate for declining sensor
sensitivity, which naturally occurs as the installed sensors are used or “consumed."
Docking. When docked, instruments that are supported by iNet®Control or DSSAC (Docking Station
Software Admin Console) will be maintained for all scheduled bump tests and calibrations,
synchronized for any changes to settings, and upgraded for improvements from Industrial Scientific.
After implementing any modifications to the instrument through the docking station, such as firmware
updates, it is essential to confirm that there have been no alterations to calibration gas parameters,
alarm setpoints and instrument parameters.
14
Other Maintenance. The time-weighted average (TWA), short-term exposure limit (STEL), and peak
readings can each be "cleared." When any summary reading is cleared, its value is reset to zero and its
time-related setting is also reset to zero.
Note: The peak readings and the data log readings are stored independently of one another; therefore, clearing the peak reading
does not affect the data log. Powering the instrument off or changing its battery does not affect the peak reading. These checks
and balances help promote operator safety and serve to contain the peak readings in a "black-box" manner. In the event of a
gas-related incident, this black-box record can be useful to the safety team or an investigator.
Recommendations
Industrial Scientific Corporation minimum frequency recommendations for each procedure are summarized
in the table below. These recommendations are based on field data, safe work procedures, industry best
practices, and regulatory standards to help ensure worker safety. Industrial Scientific is not responsible for
setting safety practices and policies.
Industrial Scientific also recommends a daily bump test for any instrument that is not operating in
DualSense®mode. This includes the Tango®TX1 when it is operating with only one working sensor.
When two redundant, working sensors are installed in the Tango TX1, the instrument is operating in
DualSense mode and the probability of sensor failure–compared with a single-sensor instrument–is
diminished regardless of bump test frequency.
When two sensors of the same type are operating in DualSense mode and one sensor needs to be
replaced, replace both sensors at the same time.
The frequency of bump testing for DualSense instruments, between monthly calibrations, is best
determined by a company's safety policies. These policies may be affected by the directives and
recommendations of regulatory groups, environmental and operating conditions, instrument use patterns
and exposure to gas, and other factors.
Table 2.1 Industrial Scientific recommended practices, Tango TX1
Procedure
Recommended minimum frequency
Configuration
Before first use and as needed thereafter.
CalibrationaBefore first use and monthly thereafter or in accordance with local or national rules, with the
maximum interval not exceeding 6 months.
Bump testb and c Immediately following each calibration.
Self-test
d
As desired.
aBetween regular calibration procedures, Industrial Scientific also recommends that calibration be performed following each of these
incidences: the unit falls, is dropped, or experiences another significant impact; is exposed to water; fails a bump test; or has been
repeatedly exposed to an over-range (positive or negative) gas concentration. Calibration is also recommended after the installation of a
new (or replacement) sensor.
bWhen only one installed sensor is operational, the instrument is not operating on DualSense® technology, and a daily bump test is
recommended.
cA bump test must be performed daily for compliance to EN 45544-1. Workplace atmospheres — Electrical apparatus used for the direct
detection and direct concentration measurement of toxic gases and vapors, Part 1: General requirements and test methods.
dThe Tango TX1 self-test is performed automatically during the start-up process. It can be user-initiated from operation mode.
Note: The use of calibration gases not provided by Industrial Scientific may void product warranties and limit potential liability claims.
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