WatchGas 404+ Operating Instructions Manual
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WatchGas 404+ Operating Instructions Manual

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OPERATING MANUAL
WATCHGAS 404+
we watch gas where you can't

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Summary of Contents for WatchGas 404+

  • Page 1 OPERATING MANUAL WATCHGAS 404+ we watch gas where you can't...

  • Page 2: Table Of Contents

    CONTENTS DESCRIPTION TECHNICAL SPECIFICATION INSTALLATION COMMISSIONING SERVICE – ROUTINE ATTENTION TABLE OF LOWER EXPLOSIVE LIMITS TABLE OF OCCUPATIONAL EXPOSURE LIMITS – P.P.M ILLUSTRATIONS 1. Front View – Controls 2. Display Boards 3. Mother Board Detail and Field Terminals 4. Alarm Board – Component Layout 5.

  • Page 3: Description

    DESCRIPTION The WATCHGAS 404+ is a multi channel combustible and toxic gas monitor, which can accommodate up to 4 sensor channels housed in wall mounting enclosure. Sensors may be added or removed as required, but should be carried out with the power to the unit switched off.

  • Page 4: Technical Specification

    WATCHGAS 404+ TECHNICAL SPECIFICATION Number of channels One, two, three or four channels Common Relays – user selectable • Low Alarm RL1 – D.P.C.O. normally energised or de–energised– default set ND • Latched or Unlatched – default set latched •...

  • Page 5: Installation

    INSTALLATION The WATCHGAS 404+ Series control instrumentation is designed for installation in a safe area only. Siting of the instrument should be chosen with regard to the following points: (a) Cable within the enclosure should be cut back to the minimum length and having been terminated should be kept away from electronic components and the ribbon cable.

  • Page 6: Commissioning

    WATCHGAS 404+ Gas leakage may occur around valves, flanges and anywhere where gas pipes are jointed. It may be possible to cover several probable gas leaks in one room by the careful siting of a single head. Cable ducts, trenches and manholes are also likely places where a build up of heavy gases may collect.
  • Page 7 ‘device manager’ ports for example. The terminal program should be set up using the same method and settings as the WatchGas combi panel (baud rate 2400). The terminal window will appear as below. Follow the onscreen instructions:...
  • Page 8 WATCHGAS 404+ Press the character on the left of the list of commands to change that specific setting. The sensor name has 16 available characters and the gas type has 8. SENSOR SUPPLY ADJUSTMENT (CATALYTIC SENSOR) Factory set – no further adjustment required unless a change of sensor type is being made.

  • Page 9: Service - Routine Attention

    SERVICE – ROUTINE ATTENTION The owner or occupier of the premises should place the supervision of the system in the charge of a re- sponsible executive whose duty it should be to ensure the day to day operation of the system and to lay down the procedure for dealing with a gas alarm or fault warning.

  • Page 10: Table Of Lower Explosive Limits

    WATCHGAS 404+ TABLE OF LOWER EXPLOSIVE LIMITS – L.E.L TABLE OF OCCUPATIONAL EXPOSURE LIMITS The figures quoted below are taken from British – P.P.M. Standards Institute publication BS EN 60079–20– The figures quoted below are taken from guidance 1:2010 and show the L.E.L. of some of the more...

  • Page 11: Fig

    Fig. 2 DISPLAY BOARD RELAY SELECTION Common Third Alarm Relay – Normally energised/Normally de -energised – (J2)

  • Page 12: Mother Board Detail And Field Terminals

    WATCHGAS 404+ Fig. 3 MOTHER BOARD RELAY SELECTION Common High Relay – Normally energised/Normally de–energised – (J3) Common Low Relay – Normally energised/Normally de–energised – (J1) Global Alarm Relay – Normally de–energised Common Fault Relay – Normally energised/Normally de–energised – (J5) Inhibit Relay –...

  • Page 13: Alarm Board - Component Layout

    Potentiometer RV2 – Sensor Calibration Potentiometer RV3 – 4~20mA signal output – 4mA adjust Potentiometer RV4 – 4~20mA signal output – 20mA adjust Potentiometer RV5 – WATCHGAS 404+ display span (factory set) Potentiometer RV6 – Sensor Supply ALARM BOARD SELECTION...

  • Page 14: Sensor Termination

    WATCHGAS 404+ Fig 4 Fig. 5 Fig 4 3 WIRE SENSOR Combi direct sensor mV - pellistor / CV / IR Panel Panel Transmitter sensor Transmitter SENSOR – 3 WIRE +24V Gas Detector Detector Head Y SIG Control Unit mV (pellistors) or 3 wire CV...

  • Page 15: Cv Transmitter - Toxic Oxygen

    CAT170A 2v/175mA SET UP SEM–1 4v/170mA Having powered up allow 5 minutes for the sensor to sta- WATCHGAS PRIME 4v/70mA bilise. CAT335C 2.5v/335mA The sensor current/voltage should be set by connecting a voltmeter (mV range) across TP3/TP4 and adjusting the sen-...

  • Page 16: Cv Transmitter - Flammable

    WATCHGAS 404+ Fig. 7 CV TRANSMITTER TOXIC/OXYGEN Technical Sheet ref C323Fv2 TECHNICAL Input Voltage – 12~30v DC – 24v nominal CALIBRATION Output Standard – Analogue 4~20 mA (250 ohms max) – source Connect a digital voltmeter (miIIivolt range) to the + and –...

  • Page 17: Xdi-Xdi Win / 30J Flammable Sensor

    Press when no gas on sensor to Z = Zero PC or laptop (dedicated) give zero Use when calibration gas applied, Hyperterminal (download from WatchGas website) S = Span H and L change reading D = Enter calibration date Enter the calibration date...
  • Page 18 WATCHGAS 404+ XDI–XDIWIN – 15/30J Removing both magnets as instructed on the LCD presents the first part of this multi menu which is ZERO. With no gas present FLAMMABLE SENSOR – use the left magnet to increase the reading and the right magnet to decrease to achieve a zero reading on the display.

  • Page 19: Xdi-Xdi Win / 30J Toxic/Oxygen Sensor - 4/3/2 Wire Sensor

    20mA pot. The displayed reading can be made HIGHER PC or laptop (dedicated) by pressing ‘H’ or lower by pressing ‘L’ Hyperterminal (download from WatchGas website) Pressing ‘SPACE BAR’ will exit the span mode Press ‘V’ to view log of sensor readings if required Pressing ‘X’...
  • Page 20 WATCHGAS 404+ XDI–XDIWIN – 15/30J Removing both magnets as instructed on the LCD presents the first part of this multi menu which is ZERO. With no gas present TOXIC / OXYGEN SENSOR use the left magnet to increase the reading and the right magnet to decrease to achieve a zero reading on the display.

  • Page 21: Xdi-Xdi Win / 30J Prime Sensor

    Sets the CAN address PC or laptop (dedicated) G = Select gas type Select the gas type from a list Hyperterminal (download from WatchGas website) Press when no gas on sensor to Z = Zero give zero SET UP PROCEDURE:...
  • Page 22 WATCHGAS 404+ XDI–XDIWIN – 15/30J Removing both magnets as instructed on the LCD presents the first part of this multi menu which is ZERO. With no gas present PRIME SENSOR use the left magnet to increase the reading and the right magnet to decrease to achieve a zero reading on the display.

  • Page 23: Xdi-Xdi Win / 30J 4~20Ma Input

    20mA CAN 1 or 2 Fig.1 WatchGas 404+ Manual EN 06-02-24 V1.0 © 2024 WatchGas B.V. WatchGas is dedicated to continuously improving its products. Therefore, the specifications and features mentioned in this manual are subject to change without prior notice.

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