WatchGas UNI Sustainable Single Gas Detector
Quick Start Guide
WatchGas | Klaverbaan 121 | 2908 KD Capelle aan den IJssel | The Netherlands | www.watchgas.com | info@watchgas.com
Warnings
WARNING:
- Never operate the monitor when the cover is removed.
- Remove the monitor cover and battery only in an area known to be non-hazardous.
- Use only WatchGas lithium battery part number M500-0001-000 [1.17.02.0002] (3.6 V, 2700 mAh, AA size).
- 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 and 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 colorless ESD layer on the display is not damaged or peeling. (The blue protective film may be removed.)
Read Before Operating
The User's Guide 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.
User Interface
The UNI's user interface consists of the LCD display, LEDs, an alarm buzzer, two keys: Left Key [Confirm/Number increasing] and Right Key [Power/Cursor moving], an alligator clip, and a chemical sensor.
Description of Detector Components:
- ALLIGATOR CLIP: Located at the top for attachment.
- LED-ALARM WINDOW: Visual alarm indicator on the left side of the display.
- LCD DISPLAY: The main screen showing readings and status.
- CONFIRM/NUMBER INCREASING KEY: Labeled 'OK', used for confirmation and increasing values.
- BUZZER: Audible alarm indicator located at the bottom center.
- BATTERY STATUS: Indicator on the right side of the display showing battery level.
- POWER/CURSOR MOVING KEY: Used to turn the unit on/off and navigate menus.
- SENSOR WITH ID LABEL: The chemical sensor is located at the bottom front.
Display Detail
The LCD display shows various information:
- Segment 1: Gas name, including CO, H2S, SO2, or O2.
- Segment 2: A question mark symbol, indicating a prompt for operation.
- Segment 3: An "OK" status indicator, used to accept number entry or confirm operations.
- Segment 4: Displays the concentration unit, e.g., ppm, %, mg/m³, µmol/mol.
- Segment 5: Shows the battery charge status.
- Segment 6: Indicates the alarm type (e.g., HIGH, LOW, STEL, TWA).
- Segment 7: A "Zero" or "Cal" in-progress indicator.
- Segment 8: Indicates "Calibration in progress".
- Segment 9: Displays the concentration or other numerical value.
Operation
Turning the Unit On
Press and hold the Right Key for 4 seconds. The LCD will display "On", the buzzer will beep, and the green LED will illuminate. The unit will then enter a warm-up and self-test sequence, showing firmware version and programmed alarm limits (STEL, TWA, etc.).
Note: Some units may require several minutes to an hour to stabilize and may need to be re-zeroed.
Turning the Unit Off
In normal display mode, press and hold the Right Key for 5 seconds. A countdown will appear on the display until the unit powers off.
Normal Mode
In normal mode, the gas concentration is displayed continuously on the LCD. The unit will alarm if a pre-set limit is exceeded. Users can check other values like STEL, TWA, and PEAK (and MIN for O2) by pressing the Right Key. Alarm events are also shown.
Enter Configuration Mode
Press and hold both the Left and Right keys together for 3 seconds. The display will show "PWD", prompting for password entry. Use the Left Key to increase numbers and the Right Key to move the cursor. After entering four digits, the cursor moves to "OK". Press the Left Key to accept and enter Configuration Mode.
Configuration Mode Menu
In Config Mode, users can perform calibrations and change operating parameters:
- AIR, SPAN: Zero or Span calibration.
- BUMP: Bump test.
- SET HIGH\LOW\STEL\TWA: Adjust alarm limits.
- SET CAL: Change span value.
- CAL INTV, BUMP INTV: Set calibration or bump interval.
- SET UNIT: Change concentration unit.
- VIB SET: Enable/disable vibrator.
- P-ON ZERO SET: Enable/disable power-on zero.
- FAST SET: Enable/disable fast power-on.
- RST CF9: Reset configuration to default values.
- EXIT: Exit Config Mode.
Generally, use the Left Key to increase a number or confirm, and the Right Key to move the cursor or to the next programming item.
Exit Config Mode
Scroll to "EXIT?" and press the Left Key to exit Config Mode and return to Normal Mode.
Daily Self-Test
Press the Left Key to confirm that the LEDs flash, the buzzer beeps, and the unit vibrates (if programmed).
Alarm Limits Adjustment
To adjust an alarm limit, enter Config Mode and scroll to the desired alarm setting (e.g., SET HIGH\LOW\STEL\TWA?).
- Press Left to display the alarm value with the first digit flashing.
- Use Left to move to the desired flashing digit.
- Use Right to increase the value and cycle through digits 0-9.
- When finished, scroll Right to "OK" and press Left to save and exit.
Zero (Fresh Air) Calibration
Zero calibration sets the baseline for the sensor using fresh air or another clean air source. Enter Config Mode; "AiR?" will display as the first menu item. Press the Left key to start the 15-second zero calibration countdown. A "pass" or "fail" result will be displayed. To abort, press the Right key at any time during the countdown; "AbRT" will display to confirm.
Span Calibration
Span calibration uses a known concentration gas to determine the sensor's response. It involves the following steps:
- Attach the Calibration Adapter over the inlet port on the front of the unit. Use a fixed-flow regulator with a flow rate of approximately 0.3 to 0.5 LPM. Higher flow rates may be used if necessary, but not lower. For reactive gases (e.g., hydrogen chloride, hydrogen fluoride, ozone, chlorine dioxide, phosphine, ammonia, ethylene oxide), use Teflon tubing connections.
- Enter Config Mode and scroll to "SPAN?".
- Start the gas flow and press the Left key to begin the calibration countdown. The default count time is 60 seconds, but some sensors may take longer.
- When finished, a "pass" or "fail" result will be displayed. Turn off the gas supply, remove the calibration adapter, and exit to Normal Mode.
- To abort at any time during the countdown, press the Right Key; "AbRT" will display.
Maintenance and Service
If used in high-dust environments, replace the inlet filter regularly. The battery and sensor can be replaced as needed. For other maintenance, contact mPower's service department or refer to the full User Manual.
Maintenance Steps:
- Remove 4 Screws: Unscrew the four screws on the back of the detector.
- Turn Around Detector: Flip the unit over.
- Remove Unit Cover: Open the detector casing.
- Replace Sensor: Carefully remove the old sensor from its housing.
- Replace Rubber Holder with Filter: Replace the rubber holder containing the inlet filter.
- Replace Battery: Open the battery compartment and insert a new battery, ensuring correct polarity (+/-).
Proper Product Disposal
The Waste Electrical and Electronic Equipment (WEEE) directive (2012/19/EU) promotes the recycling of electrical and electronic equipment and their components at the end of their life. The symbol of a crossed-out wheeled bin indicates separate collection for waste electrical and electronic equipment in EU countries.
This product may contain nickel-metal hydride (NiMH), lithium-ion, or alkaline batteries. Specific battery information is provided in the user guide. Batteries must be recycled or disposed of properly. At the end of its life, this product requires separate collection and recycling, distinct from general or household waste. Please use the return and collection system available in your country for disposal.
WatchGas B.V.
Klaverbaan 121
2908 KD Capelle aan den IJssel
The Netherlands
+31 (0)85 01 87 709
info@watchgas.eu - 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 critical quotations, criticisms and other non-commercial uses permitted by copyright law. For permission requests please contact WatchGas B.V.
Version 2.0, dated 10-12-24.
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