WatchGas UNI Sustainable Single Gas Detector

Description

The UNI Sustainable is a single sensor, portable, personal toxic gas monitor. It displays gas concentration continuously on a big segment LCD. It also monitors STEL, TWA, peak and min (for O₂ only) values of the gas and can be displayed on demand. High, Low, STEL&TWA alarm threshold values are configurable. The shell is made of high strength, durable material. It features two-key operation, making it simple to use. The sensor and battery can be replaced easily, and calibration is also very convenient.

Warning

This manual must be carefully read by all individuals who have or will have the responsibility of using, maintaining, or servicing this product. The product will perform as designed only if it is used, maintained, and serviced in accordance with the manufacturer's instructions.

• Never operate the monitor when the cover is removed.
• Remove the monitor cover and battery only in an area known as non-hazardous.
• Use only WatchGas lithium battery.
• This instrument has not been tested in an explosive gas/air atmosphere having an oxygen concentration greater than 21%.
• Substitution of components will impair suitability for intrinsic safety.
• Substitution of components will void warranty.
• It is recommended to bump test with a known concentration gas to confirm the instrument is functioning properly before use.
• Before use, ensure that the ESD film on the display is not damaged or peeling.

Proper Disposal

The Waste Electrical and Electronic Equipment (WEEE) directive (2012/19/EU) is intended to promote recycling of electrical and electronic equipment and their components at end of life. This symbol ?️ (crossed-out wheeled bin) indicates separate collection of waste electrical and electronic equipment in the EU countries. This product may contain one or more Nickel-metal hydride (NiMH), Lithium-ion, or Alkaline batteries. Specific battery information is given in this user guide. Batteries must be recycled or disposed of properly. At the end of its life, this product must undergo separate collection and recycling from general or household waste. Please use the return and collection system available in your country for the disposal of this product.

1. Product Overview

DETECTOR COMPONENTS

Image shows the UNI Sustainable gas detector with numbered components:

• 1. Audible Alarm Port
• 2. LED alarm window
• 3. LCD
• 4. Left Key (Confirm/Number increasing)
• 5. Right Key (Power/ Cursor moving)
• 6. Alligator clip
• 7. Sensor
• 8. Vibrator

DISPLAY SYMBOLS

• 1. Gas name, includes: CO, H₂S, SO₂, O₂, VOC
• 2. Question mark (?)
• 3. OK
• 4. Gas unit, includes: x10⁻⁶, ppm, %, mg/m³, µmol/mol
• 5. Battery indicator
• 6. Alarm indicators (HIGH, LOW, STEL, TWA)
• 7. Span calibration indicator
• 8. Zero calibration indicator
• 9. Number

2. Activation

2.1 SWITCH ON

Press and hold the Right Key for 3 seconds, until LCD displays (on), buzzer beeps, green LED flashes, then release the button. The unit is powered on.

2.2 WARM UP SEQUENCE

After powering on, the unit enters a warm-up and self-test sequence and shows the firmware version as follows:

VER XXXX

If the sensor is not able to be identified by the instrument or is not installed into the instrument, then the screen switches between SEN and Err. Otherwise, the following values will be shown accordingly:

• 200: High alarm threshold value
• 35: Low alarm threshold value
• 100: STEL (short-term exposure limit) alarm threshold value
• 35: TWA (time-weighted average) alarm threshold value

3. Mode

3.1 NORMAL MODE

The unit enters normal mode, starting to monitor gas concentration and display it on the LCD screen.

User can check other values like STEL, TWA, PEAK, and MIN (for O₂ only) by pressing the Right Key. The unit will return to real-time reading from any other screen when there's no key action for 60 seconds.

• STEL screen
• TWA screen
• PEAK screen: Press the Left Key to clear peak value. Press the Left Key again, peak value is cleared.

3.1.1 MIN SCREEN (FOR OXYGEN SENSOR ONLY)

• Press the Left Key to clear min value.
• Press the Left Key again, minimum value is cleared.
• Press the Left Key again, minimum value is cleared.

3.1.2 TURN UNIT OFF

In normal display mode, press and hold the Right Key. The unit will display a 5-second countdown, LEDs will flash, and the buzzer will beep once per second.

3.2 CONFIG MODE

In Config mode, the user can perform calibration and change parameters for the unit. Generally, use the Left Key to increase the number or confirm, and use the Right Key to move the cursor or move to the next programming item.

3.2.1. ENTER CONFIG MODE

Press and hold the Left Key and the Right Key together for 3 seconds to enter Config mode. The Config mode is password protected; the LCD displays **** to prompt for password entry. The screen displays 0000 with one digit flashing.

To input the password, use the Left Key to increase the number and the Right Key to move the cursor. Once all four digits are input, the cursor moves to "OK". Use the Left Key to finish password input and enter Config mode. If a digit input is mistaken, use the Right Key to move the cursor between the four digits and the "OK" mark to change the input.

WatchGas Sustainable preset password is 0000.

3.2.2. SENSOR CALIBRATION

Before the unit can monitor gas correctly, it needs to know the metric. This is done by zero calibration and span calibration.

3.2.3 CALIBRATION ADAPTER

1. A calibration adapter is used to apply gas to the unit during calibration.
2. Before span calibration (in the following section), attach the Calibration Adapter over the inlet port on the front of the UNI Sustainable by pressing it into place.
3. Open the gas cylinder valve, then press the Left Key to start the calibration countdown.

Image shows the calibration adapter being attached to the sensor inlet port.

4. Calibration and Bump Test Procedures

After applying calibration gas, take off the Calibration Adapter and complete calibration.

When monitoring, never operate the UNI Sustainable with the Calibration Adapter attached. The UNI Sustainable's sensor operates by diffusion. If the Calibration Adapter is attached during normal operation, inconsistent and lower-than-normal readings will occur because of decreased concentration of the gas being monitored.

3.2.4 ZERO CALIBRATION

Zero calibration sets the baseline for the sensor and is done in fresh air. When the LCD displays ZERO, press the Left Key to start zero calibration. The unit will start a 15-second countdown. After the countdown finishes, the zero calibration result will be displayed on the LCD as PASS or FAIL. If the user does not want to perform zero calibration, press the Right Key during the 15-second count; zero calibration will be aborted (ABRT).

3.2.5 SPAN CALIBRATION

Span calibration sets the metric of the sensor to the gas, using a known concentration gas. When the LCD displays SPAN, apply the known gas to the unit, then press the Left Key to start span calibration. The unit will start a countdown; the duration depends on different sensors (normally 60 seconds). After the countdown finishes, the span calibration result will be displayed as PASS or FAIL. If the user does not want to perform span calibration during the countdown, press the Right Key; the LCD displays ABRT, and span calibration is aborted.

3.2.6 BUMP TEST

Bump test checks if the sensor and alarm devices are working properly, using a known concentration gas. When the LCD displays BUMP, apply the known gas to the unit, then press the Left Key to start the bump test. The unit will start a countdown (normally 45 seconds, depending on the sensor). After the countdown finishes, the bump test result will be displayed as PASS or FAIL. If the user does not want to perform the bump test during the countdown, press the Right Key; the LCD displays ABRT, and the bump test is aborted.

3.2.7 CHANGE ALARM LIMIT

All preset alarm limits (High, Low, STEL & TWA) can be changed. When the LCD displays:

SET HIGH, SET LOW, SET STEL, SET TWA

Press the Left Key to change the corresponding alarm limit. The value change process is similar: the current setting value is displayed, with the first digit flashing (e.g., 0000).

• Use the Left Key to increase the current digit (cycling from 0 to 9).
• Use the Right Key to move the cursor to the next digit.

After all digits are set, use the Right Key to move the cursor to the "OK" symbol, then press the Left Key to confirm the change.

The UNI Sustainable will show "Err" if the input data is invalid, such as:

• Low alarm setting is greater than high alarm setting.
• High alarm setting is smaller than low alarm setting.
• Input data is outside the measuring range.

3.2.8 CHANGE BUMP/CAL INTERVAL

The bump and calibration interval can also be changed. When the LCD switches between:

BUMP INT'V CAL and INT'V

Press the Left Key to change the corresponding interval range. The value change process is similar. The current setting value is displayed, with the first digit flashing (e.g., 0000).

• Use the Left Key to increase the current digit (cycling from 0 to 9).
• Use the Right Key to move the cursor to the next digit.

After all digits are set, use the Right Key to move the cursor to the "OK" symbol, then press the Left Key to confirm the change.

The UNI Sustainable will show "Err" if the input data is out of the valid range (0-180 days).

3.2.9 CHANGE SPAN VALUE

The span calibration preset value can also be changed. The change process is similar to changing alarm limits. However, the new span value will only take effect after the user successfully completes a span calibration next time.

UNI Sustainable will show "Err" if the input data is invalid, such as:

• Span setting is less than 5% of the measuring range or greater than the measuring range.
• For the Oxygen sensor, the span setting is greater than 19.0.

3.2.10 CHANGE DISPLAY UNIT

The UNI Sustainable supports different gas units. To change the gas unit, when the LCD switches between UniT and SET, press the Left Key. The supported units for the current sensor are displayed on the LCD; the currently selected unit is blinking. Use the Right Key to change the unit and the Left Key to confirm the selected gas unit.

3.2.11 VIBRATOR ENABLE/DISABLE

The vibrator consumes significant power and can be disabled to save battery power and extend battery life. When the LCD switches between Vib and SET, press the Left Key to change the vibrator enable/disable status. The current status is displayed on the LCD, switching between On and Off if the vibrator is enabled, or between Off and On if disabled. Use the Right Key to change the enable/disable status and the Left Key to confirm the change.

3.2.12 POWER ON ZERO ENABLE/DISABLE

Sensor baseline may change due to environmental factors (temperature, humidity), requiring zero calibration. The Uni Sustainable can perform zero calibration every time the unit is powered on; this feature can be enabled/disabled.

When the LCD switches between P-on and SET, press the Left Key to change the power-on zero calibration enable/disable status. The current status is displayed on the LCD. Use the Right Key to change and the Left Key to confirm.

3.2.13 FAST POWER ON ENABLE/DISABLE

If fast startup is enabled, the screens showing High/Low/STEL/TWA alarm threshold values will be skipped during the warm-up sequence.

When the LCD switches between FAST and SET, press the Left Key to change the fast startup enable/disable status. The status is displayed on the LCD, switching between FAST and ON if fast startup is enabled, or between FAST and OFF if disabled. Use the Right Key to change the status and the Left Key to confirm.

3.2.14 RESET CONFIG

If unit parameters are incorrect and the user does not know how to reset them, the reset config option can be used to restore all parameters to factory defaults.

When the LCD switches between RST and CFG, press the Left Key to enter the config reset menu, then press the Left Key to confirm the reset.

3.2.15 EXIT CONFIG

When the LCD displays EXIT, press the Left Key to exit Config mode and return to normal mode.

4. Maintenance

Maintenance should be performed only by a qualified person who has proper training and fully understands the contents of the manual.

4.1 REPLACE THE BATTERY

When the battery's charge is low, the LCD displays [battery low], and a battery low alarm will be triggered once every minute. User needs to replace the battery.

When the battery is dead, the LCD displays [battery dead], and a battery dead alarm will be triggered once every second. User needs to replace the battery.

To replace battery:

1. Turn off the UNI Sustainable.
2. Place the UNI Sustainable face down on a soft surface.
3. Use a T10 Torx screwdriver to loosen each of the four screws by turning them counterclockwise.
4. Remove the top cover after carefully unplugging the buzzer connector.
5. Slide the battery out of its compartment.
6. Place the new battery into the compartment with its "+" end oriented toward the "+" on the printed circuit board.
7. Plug in the buzzer connector and reinstall the top cover.
8. Install the screws in the back cover. Be careful not to overtighten the screws.

4.2 REPLACE THE SENSOR FILTER

A "peel-and-stick" filter should be used on the UNI Sustainable to prevent debris from fouling the sensor. Sheets of 5 filters are available. When the filter appears dirty, replace it with a new one and dispose of the dirty filter.

1. Turn off the UNI Sustainable.
2. Place the UNI Sustainable face down on a soft surface.
3. Use a T10 Torx screwdriver to loosen each of the four screws by turning them counterclockwise.
4. Remove the top cover after carefully unplugging the buzzer connector.
5. Peel a filter from the sheet and center it over the sensor. Gently press down.
6. Plug in the buzzer connector and reinstall the top cover.
7. Install the screws in the back cover. Be careful not to overtighten the screws.

4.3 REPLACE THE SENSOR

The UNI Sustainable models are designed so that you can easily change the sensor.

1. Turn off the unit.
2. Place the UNI Sustainable face down on a soft surface.
3. Use a T10 Torx screwdriver to loosen each of the four screws by turning them counterclockwise.
4. Remove the top cover after carefully unplugging the buzzer connector.
5. Replace the old sensor with a new one. Make sure the pins are not bent or corroded. Align the pins to the corresponding holes and push the sensor straight in. The sensor should fit flush against the printed circuit board.
6. Plug in the buzzer connector and reinstall the top cover.
7. Install the screws in the back cover. Be careful not to overtighten the screws.

Sensors are not interchangeable. Use only WatchGas sensors, and use only the sensor type specified for your UNI Sustainable monitor. Use of non-WatchGas components will void the warranty and can compromise the safe performance of this product.

Diagram: Component Replacement

Image shows the internal components of the UNI Sustainable detector. Arrows indicate the placement and orientation for replacing the sensor, sensor filter, and battery.

• SENSOR: Located at the bottom, with pins aligning to holes.
• SENSOR FILTER: A circular filter placed over the sensor area.
• BATTERY: Compartment shown with terminals marked [-] and [+].

Filter needs replacement when discolored, clogged with particles, or draws in liquid, otherwise it will contaminate the sensor and void the warranty.

Change battery only in an area known to be non-hazardous. Use only WatchGas battery.

5. Alarm Signal Summary

• OVER / 500 ALARM: Buzzer: 3 beeps per second. LED: 3 flashes per second. Vibration: 1 per second. Screen displays "OVER" and "500" with 1 flash per second.
• HIGH ALARM: Buzzer: 3 beeps per second. LED: 3 flashes per second. Vibration: 1 per second. Screen displays "HIGH" with 2 flashes per second.
• LOW ALARM: Buzzer: 2 beeps per second. LED: 2 flashes per second. Vibration: 1 per second. Screen displays "LOW" with 2 flashes per second.
• STEL ALARM: Buzzer: 1 beep per second. LED: 1 flash per second. Vibration: 1 per second. Screen displays "STEL" with 2 flashes per second.
• TWA ALARM: Buzzer: 1 beep per second. LED: 1 flash per second. Vibration: 1 per second. Screen displays "TWA" with 2 flashes per second.
• NEGATIVE DRIFT ALARM: Buzzer: 1 beep per second. LED: 1 flash per second. Vibration: 1 per second.
• BUMP OVER DUE ALARM: Buzzer: 1 beep per minute. LED: 1 flash per minute. Vibration: 1 per minute.
• CAL OVER DUE ALARM: Buzzer: 1 beep per minute. LED: 1 flash per minute. Vibration: 1 per minute.
• EMPTY BATTERY ALARM: Buzzer: 1 beep per minute. LED: 1 flash per minute. Vibration: 1 per minute. Battery icon: 1 flash per minute.
• SENSOR ERROR: Buzzer: 1 beep per second. LED: 1 flash per second. Screen displays "SEN Err" with 1 flash per second.
• BATTERY LOW ALARM: Buzzer: 1 beep per second. LED: 1 flash per second. Screen displays "bAT LoW" with 1 flash per second.

6. Trouble shooting

7. Specifications

DETECTOR SPECIFICATIONS

7. Sensor Specifications

8. Limited Warranty

WATCHGAS warrants this product to be free of defects in workmanship and materials under normal use and service for two years from the date of purchase from the manufacturer or from the product's authorized reseller.

The manufacturer is not liable (under this warranty) if its testing and examination disclose that the alleged defect in the product does not exist or was caused by the purchaser's (or any third party's) misuse, neglect, or improper installation, testing, or calibrations. Any unauthorized attempt to repair or modify the product, or any other cause of damage beyond the range of the intended use, including damage by fire, lightning, water damage, or other hazard, voids liability of the manufacturer.

In the event that a product should fail to perform up to manufacturer specifications during the applicable warranty period, please contact the product's authorized reseller or WATCHGAS service center at +31 (0)85 01 87 709 for repair/return information.

Contact Information

WatchGas B.V.
Klaverbaan 121
2908 KD Capelle aan den IJssel
The Netherlands
Phone: +31 (0)85 01 87 709
Email: info@watchgas.eu
Website: www.watchgas.eu

All rights reserved. No part of this publication may be reproduced, distributed, or transmitted in any form or by any means, including photocopying, recording, or other electronic or mechanical methods, without the prior written permission of the publisher, except in the case of brief quotations embodied in critical reviews and certain other noncommercial uses permitted by copyright law. For permission requests, contact WatchGas B.V.

Document Version: 21-05-21 V.1.2