WatchGas SST1 Single Gas Detector User Manual

Introduction

The WatchGas SST1 is a portable, single-gas detector designed for personal safety. It is a disposable device, operating for either 2 or 3 years (Oxygen models operate for 2 years only). The SST1 is designed as a maintenance-free unit, eliminating the need to replace sensors, batteries, or other key components. It detects the presence of specific gases: H2S (Hydrogen Sulfide), CO (Carbon Monoxide), SO2 (Sulfur Dioxide), and O2 (Oxygen) deficiency. The device provides low and high alarm indications to alert users to gas presence, including STEL (Short Term Exposure Limit) and TWA (Time Weighted Average) readings in real-time mode.

The SST1 is designed for ease of use, featuring one-button operation and NFC (Near Field Communication) for simple configuration and full compliance. Its rugged design is built to withstand tough industrial environments, protecting users against hazardous gas exposure.

Important Safety Information

WARNING:

• Do not attempt to replace internal components. This action will void the intrinsic safety rating and the product warranty. Replacements must use original WatchGas parts.
• Periodically test the sensor's response by exposing the detector to a target gas concentration that exceeds the alarm setpoint. Manually verify that the audible, vibration, and visual alarms are activated.
• Ensure the monitor is switched on, and the sensor and audible port are clean before use.

CAUTION/SPECIAL CONDITIONS:

• All inspections should be performed in a clean and hazard-free environment.
• The detector can be cleaned with a soft, damp cloth using a neutral cleaner (e.g., ACL Staticide).
• NOTE: Do not use solvents, soaps, or polishes.
• Bump test the sensor's response by exposing the detector to a target gas concentration that exceeds the alarm setpoint. Manually verify that the audible, vibration, and visual alarms are activated.

General Safety Notes:

• This product is a gas detector, not a measuring device.
• For optimal performance, periodically zero the sensor in a normal atmosphere (20.9% v/v O2) that is free of hazardous gas.
• Activate the detector before the activation date indicated on the box or inspect battery capacity.
• The equipment is intended for use in hazardous atmospheres in air with normal oxygen content not exceeding 21% v/v.
• The end-user must contact the equipment manufacturer if the antistatic film on the LCD display is damaged.
• Toxic gas sensors (CO, H2S, SO2) do not require calibration for the life of the product; however, bump testing is recommended.
• Perform a Bump Test if the detector has been subjected to physical impact, liquid immersion, an Over Limit alarm event, custody changes, or anytime the detector's performance is in doubt.
• Bump Test by exposing the detector to a known concentration of target gas that exceeds the low alarm setpoints. The Bump Test must be performed manually in a clean air environment.
• If a unit fails a Bump Test, calibrate the detector. If the unit fails calibration, discontinue use (the device locks after 10 failed calibrations).
• The accuracy of the SST1 depends on the quality of target gases.
• The SST1 contains a lithium battery that must be disposed of correctly according to local country requirements.
• Do not attempt to replace the battery or sensor; this product is designed to be disposable. Changing these components will void the warranty.
• If you suspect any malfunction or encounter technical problems, contact WatchGas or a local verified partner.

Device Overview

The SST1 is a portable, single-gas device. It is disposable and operates for 2 or 3 years (O2 models are 2-year only). Designed as maintenance-free, there is no need to replace sensors, batteries, or other key components. The SST1 detects the presence of specific gases: H2S (Hydrogen Sulfide), CO (Carbon Monoxide), SO2 (Sulfur Dioxide), and O2 (Oxygen) deficiency. It provides low and high alarm indications to alert users to gas presence, including STEL and TWA readings in real-time mode.

Device Components:

• 1. LCD display
• 2. Visual alarm bars
• 3. Audible alarm
• 4. Screen scratch protectors
• 5. Gas identification
• 6. Button
• 7. Sensor
• 8. Housing
• 9. Alligator clip
• 10. Serial number
• 11. NFC antenna
• 12. Certification label

Display Information

CAUTION: If the display is missing icons or cannot be clearly read, please contact WatchGas or a local authorized partner.

The detector uses an LCD to visually display its status. In the absence of gas, the real-time mode displays the current reading. When gas is present, the display automatically shifts to show the gas concentration. The display mode can be changed to suit the user via the WatchGas App.

Alarms and Indicators

Alarm Notification Types:

• LOW: Low Alarm
• HIGH: High Alarm
• STEL: Short Term Exposure Alarm
• TWA: Time Weighted Average Alarm

Sensors:

• H2S: Hydrogen Sulphide Sensor
• CO: Carbon Monoxide Sensor
• O2: Oxygen Sensor
• SO2: Sulphur Dioxide Sensor

Warnings and Information Indicators:

• ! Unit Expired / Circuit Fault
• ! Compliance / diagnostic failure
• Peak alarm seen last 24 Hrs
• Product Compliant
• Product Non-Compliant
• Calibration Required
• Bump Required
• NFC in Communication
• Button Prompt

Units of Measure:

• VOL: Percent Volume (for O2)
• PPM: Parts Per Million (for H2S / CO / SO2)
• MG/M3: Milligrams per Cubic Meter

Time Displays:

• Real Time Clock
• Months Remaining on Device
• Days Remaining on Device

Information Screen Examples: A short button press allows review of device information. The screen may show:

• 1. Months Remaining (e.g., "24")
• 2. Peak Exposure or real-time reading (e.g., "H2S 236")
• 3. RTC Time (e.g., "12:34")

Alarm Display Examples:

• 4. Low Alarm set point (e.g., "LOW ALARM 25.0 H2S PPM")
• 5. High Alarm set point (e.g., "HIGH ALARM 150 H2S PPM")
• 6. STEL Alarm set point (e.g., "STEL ALARM 25.0 H2S PPM" - only in real-time mode)
• 7. TWA Alarm set point (e.g., "TWA ALARM CLF CL H2S PPM" - only in real-time mode)
• 8. Clear Peak (indicated by button press)
• 9. Clear Confirmed

Activating the Detector

To activate the detector within the validity period indicated on the box, press and hold the button for approximately 5 seconds. Upon activation, the detector will sound the audible alarm, flash, and initiate stabilization. The remaining operational time will be displayed on the screen. A successful activation will show the remaining life as 24 or 36 months (O2 models: 24 months) or the sensor's real-time reading if configured.

Daily Usage

A short button press allows for the review of device information.

Button Functions

• Short press: Cycle through menu options.
• 1-second press: Single beep, NFC activated (NFC icon appears on display).
• 3-second press: Double beep, self-test activated.

In real-time mode:

• Press and hold for more than 5 seconds: Initiate zero calibration.
• Press and hold for more than 10 seconds: Reset STEL/TWA alarm.

Alarm Type Intervals

The detector provides different alarm intervals:

• Low Interval Alarm: Low interval of audible and visual alarms.
• Mid Interval Alarm: Mid interval of audible and visual alarms (typically for TWA and STEL alarms).
• High Alarm: Fast interval of audible and visual alarms.

Alarm Set Points

These set points can be changed using the WatchGas App. Pressing the button on the front of the detector displays the current alarm set points.

Calibration for O2 Detector

The SST1 O2 detector is configured to prompt for calibration daily. When the calibration icon and the button prompt icon are displayed (Step 1), it indicates that an O2 sensor calibration is required. To perform the calibration, press and hold the button for more than 5 seconds (Step 2). If the button is released during calibration, the process will be aborted, and the calibration request icon will reappear.

Product Information

Self-Test Procedure

Prior to daily use, the user must perform a self-test to ensure the device is safe for operation.

1. STEP 1: When a self-test is required, the gas icon will flash at the bottom of the screen.
2. STEP 2: Press and hold the button for more than 3 seconds. The unit will give a single beep indication (NFC on). Continue holding the button until a double beep is heard, then release.

After releasing the button, the following operations occur: the right and left side LEDs light up (accompanied by an audible beep and vibration), all LCD display icons appear, and the sensor is diagnosed. The self-test is then completed. The duration of the self-test can be adjusted in the WatchGas App.

Event Log

The SST1 stores the last 100 alarm events using a First-In, First-Out (FIFO) system. The 101st event will overwrite the first event. This stored information can be downloaded and reviewed using the WatchGas App. The stored information includes:

• The detector serial number
• Number of events
• Time elapsed since the gas alarm occurred
• Duration of the alarm
• Type of alarms (Low, High, TWA, or STEL)
• Compliance status
• Calibration / Bump test results

Bump Test

Bump Test intervals can be configured using the WatchGas App. If the bump test toggle is switched off in the app, the detector will not display the bump-test request. If the detector is due for a bump test, the "BUMP" icon will be visible on the bottom left of the screen. The bump test can be performed manually using bump gas and the WatchGas App, or by using the SST-DOCK.

Specifications

Limited Warranty

WatchGas provides a repair or replacement service, free of charge, for products with defects or quality issues within the warranty period, either directly by WatchGas or through an authorized Partner/Service Center. This warranty is valid only for the original buyer making a personal purchase and is contingent upon the detector being activated by the date specified on the package.

This warranty does not cover:

1. Fuses, disposable batteries, or routine replacement of parts due to normal wear and tear from product use.
2. Any product that, in WatchGas's opinion, has been misused, altered, neglected, or damaged due to accident or abnormal conditions of operation, handling, or use.
3. Any damage or defects resulting from repairs performed by anyone other than an authorized dealer, or from the installation of unapproved parts on the product.

The obligations under this warranty are conditional upon:

1. Proper storage, installation, calibration, use, maintenance, and compliance with the product manual instructions and any other applicable WatchGas recommendations.
2. Prompt notification by the purchaser to WatchGas of any defect. No products should be returned to WatchGas until the purchaser receives shipping instructions from WatchGas.
3. WatchGas reserves the right to require the purchaser to provide proof of purchase, such as the original invoice, bill of sale, or packing slip, to establish that the product is within the warranty period.

In no event shall WatchGas's liability exceed the actual purchase price paid by the buyer for the product. The buyer agrees that this warranty represents the buyer's sole and exclusive remedy and is provided in lieu of all other warranties, express or implied, including but not limited to any implied warranty of merchantability or fitness for a particular purpose. WatchGas shall not be liable for any special, indirect, incidental, or consequential damages or losses, including loss of data, whether arising from breach of warranty or based on contract, tort, or reliance on any other theory. Some countries or states may not allow limitations on the term of an applied warranty, or the exclusion or limitation of incidental or consequential damages; therefore, these limitations and exclusions may not apply to every buyer. If any provision of this warranty is held invalid or unenforceable by a court of competent jurisdiction, such holding will not affect the validity or enforceability of any other provision.

Intrinsic Safety and Compliance

Intrinsic Safety Certifications:

• II 1 G Ex ia IIC T4 Ga
• I M1 Ex ia I Ma
• IECEx EXV 22.0030X
• ExVeritas 22ATEX1314X
• ExVeritas 22UKEX1315X
• Int.Safe: CL I Dv 1, Gr A,B,C,D T4

Operating Temperature Range: -40°C ≤ Tamb ≤ +60°C

EU Conformity: www.watchgas.com

RoHS compliant

Standards:

• IEC 60079-11:2011
• IEC 60079-0:2017

Contact Information

For more information:

Website: www.watchgas.com

Email: info@watchgas.com

Europe:

Klaverbaan 121
2908 KD Capelle aan den IJssel
The Netherlands

Americas:

313 N. State Hwy 342
Red Oak, TX 75154

APAC:

Woods Square Tower 1,
12 Woodlands Square,
#11-71, Singapore 737715