WatchGas SST4 Multi-Gas Detector

Cautions and Special Conditions

All inspections must be performed in a clean and hazardous-free environment.

Clean the detector with a soft damp cloth and a neutral cleaner (e.g., ACL Staticide). Do not use solvents, soaps, or polishes.

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) free of hazardous gas.

This equipment is intended for use in hazardous atmospheres in air with normal oxygen content not exceeding 21% v/v.

Refer to the 'Sensor Poisons and Contaminants' section before use (see SAFETY INFORMATION - READ BEFORE USE chapter).

Warnings

Ensure the monitor is switched on, and the sensor and audible port are unobstructed before use.

This detector is a personal safety device. It is your responsibility to respond properly to any alarm conditions.

Do not use the device if it appears damaged. Always inspect it before use for blocked filters and physical damage.

Periodically test sensor response by exposing the detector to a target gas concentration exceeding the alarm set point. Manually verify audible, vibration, and visual alarms are activated.

For safety reasons, this equipment must be operated and serviced by qualified personnel only.

Do not attempt to replace internal components, as this will void the intrinsic safety rating and warranty (unless replaced by an authorized WatchGas service technician using genuine parts).

Deactivating the detector by removing the battery may cause improper operation and damage.

The Li-ion battery presents a risk of fire, explosion, and chemical burn if misused. Do not disassemble, incinerate, or heat above 212°F (100°C). Batteries exposed to 266°F (130°C) for 10 minutes can cause fire and explosion.

Batteries must only be charged in a safe area free of hazardous gas.

Use only WatchGas chargers. Non-approved chargers can lead to fire and/or explosion. Wireless chargers must use a suitably approved SELV/PELV supply with a maximum voltage not exceeding 5V.

This instrument contains a lithium polymer battery. Do not disassemble or dispose of in fire. Do not mix with solid waste.

Used batteries must be disposed of by a qualified recycler or hazardous materials handler.

The internal battery is non-replaceable. End-users must not access internal components.

The equipment is intended for use in hazardous atmospheres with normal oxygen content not exceeding 21% v/v. Contact the manufacturer if the antistatic film is damaged.

Wireless charging must only occur in a non-explosive atmosphere.

⚠️ Any rapid increase followed by a decrease or irregular reading may indicate a dangerous concentration above the upper limit.

Prolonged exposure to certain flammable gas concentrations can affect sensor performance. Calibrate if a high flammable gas alarm occurs. Replace the sensor if necessary.

Do not expose the detector to electrical shocks or severe continuous mechanical shocks.

Product Identification

Serial Number (10 digits):

• Digits 1-2: Product Code
• Digit 3: Model
• Digit 4: Hardware Version
• Digit 5: Year of Manufacture
• Digit 6: Month of Manufacture
• Digits 7-10: Sequential Serial Number
• Example: XXXX3CXXXX = 2023/Dec.

Intrinsic Safety:

With CAT LEL: II 1 GB Ex ia IIC T4 Ga, I M1 Ex ia I Ma

With IR Sensor Installed: II 1G Ex ia op is IIC T4 Ga, I M1 Ex ia op is I Ma

Certifications: IECEx EXV 23.0045X, ExVeritas 23ATEX1686X, ExVeritas 23UKEX1687X

Int. Safety: CL I Dv 1, Gr A, B, C, D T4

Operating Temperature: -20 °C to +60 °C (-4 °F to +140 °F)

EU Conformity: www.watchgas.com

RoHS Compliant

Standards: IEC 60079-11:2011, IEC 60079-0:2017, IEC 60079-28:2015, EN 60079-0:2018, EN 60079-11:2012, EN 60079-28:2015, EN 50270:2015/AC:2016-08

Approved Battery & Charger

Approved Battery for SST4 Micro, SST4 Mini: OP SST4-BAT

Charger:

• Induction Charger for SST Range: SST-IND-S
• Induction Disc Charger for SST Range (standard with unit): SST-DISK-CHR

Charging Instructions

⚠️ Charge only in a safe area free of hazardous gases and within temperatures of 0 °C to 45 °C (32 °F to 113 °F).

First-time charge: 3 hours.

Normal charge duration: SST4 Micro, SST4 Mini: 2-3 hours.

Indicative LEL Error: ± 5% FS

Specifications

Dimensions:

• SST4 Micro: 103.9 x 62.4 x 26.1 mm (4 x 2.4 x 0.9 inches)
• SST4 Mini: 107.9 x 62.4 x 26.1 mm (4.2 x 2.4 x 1.1 inches)
• (Measured without clip)

Weight:

• SST4 Micro: 184 g (6.5 oz.)
• SST4 Mini: 188 g (6.7 oz.)

Storage Temperature:

• -20 °C to +50 °C (-4 °F to +122 °F)

Operating Temperature:

• -40 °C to +60 °C (-40 °F to +140 °F)

Operating Humidity:

• 0% to 95% relative humidity (non-condensing)

Alarm Settings:

Alarm settings can vary by region and are user-defined. All setpoints display automatically during the startup self-test.

Detection Range:

• H2S: 0-500 ppm (1/0.1 ppm steps)
• CO: 0-2000 ppm (1 ppm steps)
• O2: 0-25% vol. (0.1% vol. steps)
• SO2: 0-100 ppm (1/0.1 ppm steps)
• Combustible (LEL): 0% to 100% LEL (1% LEL steps)

Alarm Conditions:

TWA alarm, STEL alarm, low alarm, high alarm, over-limit (OL) alarm, low battery alarm, low-low and high-high alarms. Compliance check.

Audible Alarm:

95 dB at 30 cm (1 ft.) (100 dB typical) multi-tone

Vibration Alarm:

0.8 G

Visual Alarm:

Red Light Emitting Diodes (LEDs) [?]

Display:

Alphanumeric Liquid Crystal Display (LCD)

Data Logging:

N/A

Backlight:

Activated when the button is pressed, deactivates after 5 seconds. Also activated during an alarm.

Getting Started

Activation:

Press and hold the button until the device counts down 3 seconds.

Deactivation:

Press and hold the button until the countdown to OFF is complete and the LCD deactivates.

Viewing TWA, STEL, and Peak Values:

Double-press the button to view TWA, STEL, and peak (maximum) values. Clear values by pressing the button when 'CLR' is displayed.

NFC Activation:

Press and hold the button for 1.5 seconds until a single beep is heard and the NFC icon [☍] is active.

Backlight:

Press the button to activate the backlight during normal operation.

Confirming Latched Alarms:

Press the button to confirm latched alarms.

Device Layout

When the device is powered on or off, the full screen illuminates, displaying all segments for verification.

Self-Test:

Perform a self-test by pressing and holding the button for 3 seconds. The detector will alarm, the screen will illuminate, and an internal sensor test will run.

Screen Elements:

• 1. Visual Alarm [?]
• 2. Display Screen
• 3. Audible Alarm [?]
• 4. Button [⚙️]
• 5. Oxygen Sensor
• 6. TOX Sensor
• 7. TOX Sensor
• 8. LEL Sensor

Normal Operation

During normal operation, installed sensors are displayed. A smiley face ? indicates no immediate attention is required.

Press and hold the button for 1.5 seconds until a beep is heard and the NFC icon flashes to activate NFC.

Use the WatchGas SST app or an SST Dock to configure the unit. Refer to the full manual for details.

Default Disabled Functions (SST Range): Latched alarm, heartbeat, silent mode, alarm muted, low alarm acknowledge, scan security, compliance interval, expiration date enable, zero call, safe mode, high-high and low-low alarms.

Menu Navigation

Double-press the button to access device settings.

Short-press the button to cycle through menu screens:

1. STEL: Press and hold to reset settings.
2. TWA: Press and hold to reset settings.
3. PEAK: Press and hold to reset settings.
4. Days to Calibration: (If configured)
5. Days to Bump: (If configured)
6. LEL Correction Factor
7. Language
8. Date
9. Time
10. User ID
11. Location ID

Screenshots are available in the full manual.

Calibration

SST Range products can only be calibrated using the WatchGas SST app or an SST dock.

Limited Warranty

WatchGas offers free repair or replacement for defects or quality issues within the warranty period, either directly or through an authorized partner. This warranty applies only to the original purchaser and is valid if the detector was activated by the packaging date.

Warranty Exclusions:

• Fuses, disposable batteries, or routine replacement parts due to normal wear and tear.
• Products deemed misused, altered, neglected, or damaged by accident or abnormal conditions.
• Damage or defects due to repair by unauthorized personnel or installation of non-approved parts.

Warranty Obligations are contingent upon:

• Correct storage, installation, calibration, use, maintenance, and adherence to the product manual and WatchGas recommendations.
• Prompt notification of defects to WatchGas by the buyer. No products will be returned without WatchGas shipping instructions.
• WatchGas's right to request proof of purchase (original invoice, bill of sale, or packing slip).

WatchGas's liability will not exceed the original purchase price. This warranty is the buyer's sole and exclusive remedy and replaces all other warranties, express or implied. WatchGas is not liable for special, indirect, incidental, or consequential damages, including data loss. Some jurisdictions may not allow limitations on warranty duration or exclusion of incidental/consequential damages.

For More Information

EMEA:

WatchGas
Klaverbaan 121
2908 KD Capelle a/d IJssel
Netherlands
Email: info@watchgas.com
Website: www.watchgas.com

North & South America:

313 N. State Highway 342
Red Oak, TX 75154
United States
Email: info@watchgasusa.com
Website: www.watchgasusa.com

APAC:

Woods Square Tower 1,
Woodlands Square 12,
#11-71, Singapore 737715
Email: info@watchgas.com
Website: www.watchgas.com

ANZ:

Email: aus@watchgas.com