Industrial Scientific Tango TX1 User manual

Product
Manual
The Essential Guide for
Safety Teams and
Instrument Operators
Part Number: 17154993-1
Edition:7
November 10, 2016
AUTHORIZED DISTRIBUTOR:
GasDetectorsUSA.com
Houston, Texas USA
[email protected]
832-615-3588

Industrial Scientific Corporation.
Pittsburgh, PA USA
Shanghai, China
© 2012, 2013, 2014, 2015, 2016 Industrial Scientific Corporation
All rights reserved. Published 2012
Revision 9

i
Contents
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 ................................................................................................................................................................................... 7
Procedures.................................................................................................................................................................................... 7
Recommendations ........................................................................................................................................................................ 8
First Use........................................................................................................................................................................................ 9
Wearing the Instrument................................................................................................................................................................. 9
Unpacking the Instrument ........................................................................................................................................................... 10
Hardware Overview .................................................................................................................................................................... 11
Display Overview ........................................................................................................................................................................ 12
Start-up and Shutdown ............................................................................................................................................................... 14
Configuration............................................................................................................................................................................... 17
Operation .................................................................................................................................................................................... 29
Zero, Calibration, and Bump Test ............................................................................................................................................... 31
Overview ..................................................................................................................................................................................... 35
Alarms......................................................................................................................................................................................... 35
Warnings and failures ................................................................................................................................................................. 37
Service Instructions..................................................................................................................................................................... 39
Supplies ...................................................................................................................................................................................... 39
Three-dimensional Diagrams...................................................................................................................................................... 40
Service Tasks ............................................................................................................................................................................. 42
Warranty Policy........................................................................................................................................................................... 46
Limitation of Liability.................................................................................................................................................................... 46
Appendix ..................................................................................................................................................................................... 48
Marking Requirements................................................................................................................................................................ 48
Contact Information..................................................................................................................................................................... 52

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Tables and Figures
Table 1.1 Certifications ..................................................................................................................................................................... 1
Table 1.2 Warnings and cautionary statements................................................................................................................................ 2
Table 1.3 Sensor-type options .......................................................................................................................................................... 2
Table 1.4 Instrument specifications .................................................................................................................................................. 4
Table 1.5 Sensor specifications........................................................................................................................................................ 5
Table 1.5 Sensor specifications ........................................................................................................................................................ 6
Table 1.6 Battery properties.............................................................................................................................................................. 6
Table 2.1 ISC recommended practices............................................................................................................................................. 8
Table 2.2 Securing the garment or belt clip ...................................................................................................................................... 9
Table 3.1 Package contents ........................................................................................................................................................... 10
Table 3.2. Hardware overview ........................................................................................................................................................ 11
Table 3.3 Display screens, indicators and abbreviations................................................................................................................ 12
Table 3.4 Start-up and shutdown.................................................................................................................................................... 14
Table 4.1 Configuration instruction ................................................................................................................................................. 18
Table 4.2 Operation instruction....................................................................................................................................................... 29
Table 4.3 Zero, calibration, and bump test ..................................................................................................................................... 31
Table 4.3 Zero, calibration, and bump test ..................................................................................................................................... 32
Table 4.3 Zero, calibration, and bump test ..................................................................................................................................... 33
Table 5.1 Alarm Events (listed)....................................................................................................................................................... 36
Table 5.2 Warning (listed)............................................................................................................................................................... 37
Table 5.3 Warning and Failure Screens ......................................................................................................................................... 38
Figure 6.1 Disassembled Tango TX1 ............................................................................................................................................. 40
Figure 6.2 Disassembled Tango TX1 case top assembly............................................................................................................... 40
Table 6.1 Key for the Tango TX1 diagram...................................................................................................................................... 41
Table 6.2 Service tasks................................................................................................................................................................... 42
Table A.1. Sensor cross interference (percent response) .............................................................................................................. 48
Table A.2. ATEX and IECEx marking requirements ....................................................................................................................... 48

1
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 Tables 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
ATEX
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)
Asia and Pacific
China Ex
Ex ia IIC T4 Ga
-20 °C to +50 °C (-4 °F to +122 °F)
CMA
Ex ia I Ma
-20°C ≤ Ta ≤ +50°C (-4 °F ≤ Ta ≤ +122 °F)

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Note: See the Appendix for ATEX and IECEx marking requirements.
Failure to perform certain procedures or note certain conditions may impair the performance of this product.
For maximum safety and optimal performance, please read and follow the procedures and conditions listed
below.
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.
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
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 H2 Low
Interference (CO/H2 Low) only.
Note: See Table 1.5 for sensor specifications.

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DUALSENSE®TECHNOLOGY
When two working sensors are installed, they measure gas simultaneously and independently. If only one
sensor is installed or only one installed sensor is operational, the unit operates as a single-sensor or non-
DualSense unit.
If two working sensors are installed, the data log contains a data set for each sensor, plus a third data set.
This third data set –labeled "VIRTUAL" or "3" –is created by the DualSense technology. Each VIRTUAL
data point is an algorithm-calculated value that is based on sensor 1 and sensor 2 data. The VIRTUAL data
are saved to, and downloaded from, the data log just as data are for the installed sensors. VIRTUAL gas
readings are then displayed to the instrument operator.
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 calibrations 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 said to be 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.
The optional gas-alert feature warns the instrument operator of the presence of gas in concentrations that
may be approaching the instrument’s alarm setpoints. This can prompt the instrument operator to check the
display screen for gas readings, and to optionally turn off the alert.
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.

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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 belt clip is available from ISC (see "Service"). 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 iNet DS and 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)
100 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")
Weight
126 g (4.4 oz.), typical
Ingress protection
IP66 and IP67
Operating temperature range1
-20 °C to +50 °C (-4 °F to +122 °F)
Operating humidity range
15 to 95% relative humidity (RH) noncondensing (continuous)
1 Operating temperatures above 50 °C (122 °F) may cause reduced instrument accuracy. Operating temperatures below -20 °C (-4 °F) may cause
reduced instrument accuracy and affect display and alarm performance.

5
Table 1.5 Sensor specifications
Gas type (abbreviation)
Part Number
Carbon Monoxide (CO)
Carbon Monoxide with low
Hydrogen cross-sensitivity
(CO/H2Low)
Hydrogen Sulfide
(H2S)
17155161
17155823
17155164
Properties
Category
Toxic
Toxic
Toxic
Technology
Electrochemical
Electrochemical
Electrochemical
DualSense™ capable
Yes
Yes
Yes
Operating conditions
Temperature rangea
-40 to +50 °C
(-40 to +122 °F)
-20 to +50 °C
(-4 to +122 °F)
-40 to +50 °C
(-40 to +122 °F)
RH rangea
15-95%
15-95%
15-95%
Performance
Sensitivity
Measurement range
0–1000 ppm
0−1000 ppm
0–500 ppm
Measurement resolution
1 ppm
1 ppm
0.1 ppm
Accuracyb
Calibration gas and
concentration
100 ppm CO
100 ppm CO
25 ppm H2S
Accuracy at time and
temperature of calibration
± 5%
± 5% (0–300 ppm)
± 15% (301–1000 ppm)
± 5%
Accuracy over sensor’s full
temperature range
± 15%
± 15%
± 15%
Response Time
T50
12 s
9 s
8 s
T90
48 s
18 s
20 s

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Table 1.5 Sensor specifications
Gas type (abbreviation)
Part number
Nitrogen Dioxide (NO2)
Sulfur Dioxide (SO2)
17155162
17155163
Properties
Category
Toxic
Toxic
Technology
Electrochemical
Electrochemical
DualSense™ capable
Yes
Yes
Operating conditions
Temperature rangea
-40 to +50 °C (-40 to +122 °F)
-20 to +50 °C (-4 to +122 °F)
RH rangea
15-95%
15-95%
Performance
Sensitivity
Measurement range
0–150 ppm
0–150 ppm
Measurement resolution
0.1 ppm
0.1 ppm
Accuracyb
Calibration gas and
concentration
25 ppm NO2
10 ppm SO2
Accuracy at time and
temperature of
calibration
± 10%
± 10%
Accuracy over sensor’s
full temperature range
± 15%
± 15%
Response Time
T50
10 s
20 s
T90
30 s
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.
Note: See the Appendix for supplemental information about sensor types and gases.
Table 1.6 Battery properties
Battery Pack
Properties
3.6 V Primary Lithium-thionyl chloride
(Li-SOCl2), 1.5AH, 2/3AA
Replaceable*
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.
* See "Service" for instructions. Some restrictions may apply (see "Introduction", Table 1.2 Warnings and cautionary statements).

2
Recommended Practices
Introduction
Procedures
Recommendations
First Use
Wearing the Instrument
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 calibrations promote the accurate measurement of gas concentration values. During
calibration, an instrument’s installed sensors are to be exposed to their 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.

8
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 a prospective investigator.
Recommendations
Industrial Scientific Corporation (ISC) 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.
ISC recommendations include a daily bump test for any ISC instrument that is not operating on DualSense
technology. 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 on
DualSense and the probability of sensor failure –compared with a single-sensor instrument –is diminished
regardless of bump test frequency. 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 conditions, operating conditions,
instrument use patterns and exposure to gas, and other factors.
Table 2.1 ISC recommended practices
Procedure
Recommended minimum frequency
DualSense instruments
Configuration
Before first use, when there is a change in the installed sensor type, and as otherwise needed.
Calibrationa
Before first use and monthly thereafter.
Bump testb
As desired between monthly calibrations.
Self-testc
Prior to each day’s use for a unit that is always on or is left on.
Non-DualSense instruments
Configuration
Before first use and as needed thereafter.
Calibrationa
Before first use and monthly thereafter.
Bump testb
Prior to each day’s use.
Self-testc
As desired between daily bump tests.
aBetween regular calibrations, ISC also recommends a calibration be performed immediately 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. A calibration is also recommended after the installation of a new (or replacement) sensor.
bIf conditions do not permit daily bump testing, the procedure may be done less frequently based on company safety policy.
cThe 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 ISC may void product warranties and limit potential liability claims.

9
First Use
To prepare the Tango TX1 for first use, qualified personnel should configure and calibrate the unit.
Wearing the Instrument
Based on the U.S. Department of Labor's Occupational Safety and Health Administration (OSHA) definition
of the breathing zone, it is recommended that the unit be worn within a 25.4 cm (10") radius of the nose and
mouth. Refer to OSHA and to other agencies or groups as needed for additional information.
ISC also recommends that the unit be worn within the instrument operator's sight line.
The instrument operator may wear the unit with its factory-installed garment clip or with the optional belt
clip. The garment clip is solely intended for attachment to a garment. The belt clip may be attached to a
hard hat, belt, or garment.
The clips should be securely fastened and attached in a manner that ensures the unit's sensor portals are
fully exposed to the air. No part of the unit should be covered by any garment, part of a garment, or other
item that would restrict the flow of air to the sensors or impair the operator's access to the audible, visual, or
vibration alarms. Attach the desired clip as shown below.
Table 2.2 Securing the garment or belt clip
Garment clip

Lift the clip cover.
Position the garment between the clip's upper and lower teeth.
Press down on the clip cover to secure the clip in place.
Belt clip

Position the hard hat or garment between the clip and clip
back.
Slide the clip to secure it in place.
The instrument can be worn right side up or upside down.

3
Instrument Basics
Unpacking the Instrument
Hardware Overview
Display Overview
Start-up and Shutdown
Unpacking the Instrument
The items that are shipped with the unit are listed below (see Table 3.1); each item should be accounted for
in the unpacking process.
Table 3.1 Package contents
Quantity
Item
Notes
1 as ordered
Tango TX1
Part number 18109075
1
Garment clip (installed)
Optional belt clip sold separately.
1
Calibration cup
—
1
Calibration and bump test tubing
60.96 cm (2 ') of urethane tubing; 4.762 mm (3/16 ”) ID
1
Reference Guide
Companion to the Tango TX1 Product Manual
1
Final Inspection & Test Report and
Declaration of Conformity
The Final Inspection & Test Report includes these values:
Unit setup date
Unit part number
Unit serial number
For each sensor:
Part number
Serial number
Type
Alarm settings1
Span information1
1At the time of shipment.
Note: If any item is missing or appears to have been damaged, contact ISC (see "Contact Information") or a local distributor of ISC products.

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Hardware Overview
The instrument's main hardware components are identified below (see table 3.2).
Table 3.2. Hardware overview
Tango TX1
Visual alarm (or alert)
indicator
Visual alarm (or alert) indicators
IrDA (infrared data
exchange) window
Sensor port 1 and dust filter
Sensor port 2 and dust filter
Case top
On-off-mode button
Enter button
LCD
Audible alarm (or alert) indicator
and dust filter
Case bottom
Garment clip (closed)
Garment clip (open)

12
Display Overview
The visual test screen shown below contains all the indicators that can appear on the display screen. Each
indicator is stationary and appears only when relevant to the task being performed. For example, in the
gas-monitoring screen shown below (numeric display), the following apply: the check mark indicates there
are no sensor faults; the sensor-type icon indicates that H2S sensors are installed; the numeric display
shows a gas reading of 5.1 ppm.
Table 3.3 Display screens, indicators and abbreviations
Display screens
Visual test screen
Gas-monitoring Screen
(numeric display)
Gas-monitoring screen
(text display)
Status indicators
only
Two sensors are installed and neither is in fault.
Two sensors are installed and one is in fault; a sensor location icon also displays to indicate which
sensor is in fault.
and
Only one sensor is installed and is not in fault.
!
Two sensors are installed and both are in fault or one sensor is installed and in fault. The warning icon
is also used in combination with other indicators to communicate a system alarm or an alert condition.
The unit is in configuration mode.
Alarm indicators
The alarm icon is used in combination with other indicators to communicate a variety of conditions.
and ▲
High-level gas alarm.
and ▼
Low-level gas alarm.
and
STEL alarm.
and
TWA alarm.
and
Positive over-range gas alarm.
and
Negative over-range gas alarm.
Low-battery alarm.
Process and time-based indicators
The zero icon is used in combination with other indicators to communicate sensor zero information.
The bump test icon is used in combination with other indicators to communicate bump test
information.

13
Table 3.3 Display screens, indicators and abbreviations
The calibration icon is used in combination with other indicators to communicate calibration
information.
A process is in progress. In configuration mode, indicates a time-based setting (e.g. bump test
response time).
Used in combination with other indicators to communicate maintenance required warnings. In
configuration mode, indicates a date-based setting (e.g., bump test interval).
Gas name and unit-of-measure abbreviations
Carbon Monoxide (CO)
Sulfur Dioxide (SO2 or SO2)
Nitrogen Dioxide (NO2 or NO2)
Hydrogen Sulfide (H2S or H2S)
Carbon Monoxide with H2 Low Interference
PPM
Parts per million is the unit of measure for CO, CO/H2Low, SO2, NO2, and H2S.
Configuration abbreviations
Dock “SYnC” Interval
Maintenance indicator interval
Enable Gas-alert
Dock Due option
Country of Origin
Language
Display Style
Vibrating Alarm Enabled
Other abbreviations
Short-term exposure limit. Display variations: “STEL” (English) and “VLE” (French).
Time-weighted average. Display variations: “TWA” (English) and “VME” (French).
Security code is set or to be entered. In configuration mode, indicates a feature may be operation-
mode enabled or disabled.
Peak reading.

14
Start-up and Shutdown
The start-up and shutdown sequences are outlined below and feature reproductions of the display screens
the instrument operator will see during these processes (see Table 3.4). Instructions accompany any
display screen where the instrument operator must press a button to proceed.
The instrument operator may be prompted to complete the time- and date-setting tasks during start-up.
This may happen after a battery has been removed or changed. If prompted by the unit to do so, it is
essential –for data log accuracy –that the time- and date-setting tasks be completed. The data log plays
an important role in preserving operator safety and in the prospective investigation of an incident.
The instrument operator may be prompted to enter a security code during shutdown. This will occur if the
unit is configured for "always-on" and is security-code protected.
Table 3.4 Start-up and shutdown
Start-up
Press and hold for three seconds, then release to initiate the start-up sequence and power on the unit.
The instrument performs a self-test during start-up.
If all start-up diagnostics pass, the audio, visual, and vibration indicators turn on then off. Several
start-up screens display, followed by the gas-monitoring screen.
If any start-up diagnostic fails, an error message displays (see "Alarms, Warnings and
Notifications").
To access Configuration mode, press and hold and at the same time, during the alarm
information screen cycle.
Visual test screen
Version
Calibration date (last
calibration date shown
above)
Gas Information screens (H2S shown.)
Calibration gas
setpoint
Gas-alert setpoint
(If enabled)
Low alarm setpoint
High alarm setpoint
TWA setpoint
STEL setpoint

15
Shutdown
Press and hold for five seconds.
After a five-second countdown:
The instrument powers off if;
the always-on feature is disabled or
the always-on feature is enabled and the security code is set to 000.
Countdown
Enter security code
If this screen is activated, the shutdown process is security-code protected. To complete shutdown,
the user must enter the correct three-digit code.
Value range: 000 to 999
Increments the value by one; hold to speed the increment pace.
Enters the value. If the value is correct, the unit powers off. If the value is incorrect, the gas-
monitoring screen is activated. Dock the unit or store it for next use.
Note: When the instrument is powered off, it completes a battery self-check every 24 hours, briefly
displaying a battery icon ( ). The icon displays only to indicate that the test has been performed; it
is not indicative of the battery’s charge level.
*When editing a value, once the last value in the range is reached, the display starts again with the first value.
To prepare the instrument for first use, qualified personnel should proceed with the configuration process
(see "Configuration").
To operate a field-ready unit, refer to "Operation".