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New Cosmos Electric NV-120 Series Instruction Manual For Operation

Single-point gas alarm system
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Single-Point Gas Alarm System
NV-120 series
Instruction Manual for Operation
Keep this manual for easy reference.
Prior to use, carefully read this manual as well as NV-120 series instruction manual for installation
(separate document) for correct use.
This manual describes the standard model. If your unit has end-user-specific options, this manual will be
superseded by your delivery specifications.
Instruction Manual No.
GAE-154-03
September 2022

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Summary of Contents for New Cosmos Electric NV-120 Series

  • Page 1 Instruction Manual for Operation Keep this manual for easy reference. Prior to use, carefully read this manual as well as NV-120 series instruction manual for installation (separate document) for correct use. This manual describes the standard model. If your unit has end-user-specific options, this manual will be superseded by your delivery specifications.

  • Page 2: Related Manuals

    Installation precautions One manual is provided per order, not per unit. (2) NV-120 series Instruction Manual for Operation (this document), No. GAE-154-xx This document is intended for your supervisors, operators and service personnel who are concerned with the operation and maintenance of this product. It provides the following information to ensure the safe use of the product: ●...

  • Page 3: Introduction

    (e.g., LED, beep sound, voice message), thus helping prevent incidents such as low oxygen, gas poisoning and explosion. There are various types of NV-120 series units. They are divided into four groups according to the gas detector types they are used with, and they are further divided into the following seven models according to the gas sensor types.

  • Page 4: Precautions

    Precautions Unauthorized copying and replication of the contents of this manual, in whole or in part, are strictly prohibited. The contents of this manual are subject to change without notice. This manual has been prepared with the utmost care. If any incorrect description comes to your notice, please contact us for correction.
  • Page 5 Other Signs and Symbols This manual also uses the following signs and symbols. NOTE Provides supplemental or useful information on product handling. Details the Ref. related information or procedure. Don’ts Indicates a prohibited action. Mandatory Indicates an action that must be done. Electrical hazard Warns of risk of electric shock under a certain condition.

  • Page 6: Quick Index

    Quick Index This page lists parts that may be often referenced. Prior to use, please read the precautions in “1 General Precautions”. Unit Dimensions and Components Operation Pages 8 to 13 Pages 27 to 69 Non-backup power type Power-on and Power-off Maintenance Pages 15 and 16 Pages 70 to 76...

  • Page 7: Table Of Contents

    Table of Contents Related Manuals ............................i Introduction ..............................ii Precautions ............................iii Symbols Used in this Instruction Manual ................... iii Quick Index ..............................v General Precautions ...........................1 1.1 Before Work ..........................1 1.2 Safety Precautions ........................1 1.3 Warning and Caution Labels Affixed to Product .................2 1.3.1 Warning and Caution Labels Affixed to Product ...............3 1.4 Working Clothes and Protective Equipment ................3 1.5 Batteries ............................4...
  • Page 8 Operation Menus ..........................27 5.1 Overview of Operation Menus ....................27 5.1.1 Buttons and Dial ......................27 5.1.2 Access to Main Menu ....................28 5.1.3 Select Item in Menu ....................... 28 5.1.4 Menu Operation ......................29 5.1.5 Deactivate Safety Lock ....................30 5.2 Maintenance Mode ........................

  • Page 10: General Precautions

    1 General Precautions General Precautions 1.1 Before Work In order to ensure safe use, carefully read the precautions in this manual before turning on this product to prevent unexpected accidents. New Cosmos is not responsible for the cost incurred or any damage resulting from any usage other than that outlined in this document.

  • Page 11: Warning And Caution Labels Affixed To Product

    1 General Precautions  Wiring and installation should only be performed by a qualified electrician with knowledge of wiring/installation procedures, in accordance with the applicable technical standards.  New Cosmos is not responsible for the cost incurred or any damage resulting from controlling external equipment (e.g., interlock) by using the product’s outputs (e.g., analog output, alarm relay contact output).

  • Page 12: Warning And Caution Labels Affixed To Product

    1 General Precautions Warning and Caution Labels Affixed to Product 1.3.1 relocate Do not the Warning and Caution labels affixed to the product. Carefully read the contents of the labels prior to use. Item Description Power rating label Indicates the model, power source, target gas, and manufacturing date. Caution label Indicates the cautions to be adopted while handling this product.

  • Page 13: Batteries

    1 General Precautions 1.5 Batteries This product uses two lead storage batteries (when the unit is backup power type). The batteries need to be replaced periodically. The battery life varies depending on the frequency of use and environment conditions. Follow the precautions below for proper operation. Batteries may short-circuit resulting in electric shock or burns.

  • Page 14: Battery Location

    1 General Precautions Battery Location 1.5.1 Item Description Battery x 2 pcs Battery Replacement Procedure 1.5.2 Refer to “6.1.2 Battery Replacement”. Battery Life 1.5.3 If this product is to be kept unused or stored for an extended period of time, the batteries must be removed.

  • Page 15: Battery Disposal

    The service life of this product is 10 years. The unit can operate for up to 10 years with standard installation and operation in accordance with the NV-120 series instruction manuals for installation and operation. When the service life has expired, replacement is essential for continued reliable performance and other purposes.

  • Page 16: Unit Structure

    Tension screw (M6 × 40) x 2 pcs Pan-head, used for attaching bracket to panel Flat-head screwdriver Used to open/close the terminal plugs NV-120 series Instruction manual for installation (GAE-153-xx) x 1 pc instruction manual set Instruction manual for operation (GAE-154-xx)

  • Page 17: Unit Dimensions And Components

    2 Unit Structure 2.2 Unit Dimensions and Components Main Unit (Exterior Appearance) 2.2.1 Non-backup power type Backup power type (mm) Item Component Description － Case － Cover Shows gas concentration on the display. Refer to “2.2.3 LCD” for details. Jog dial Turn to select item or increase/decrease the parameter value.
  • Page 18 Opening or audio. Gas leak or device fault alarm will be issued by beep sound and voice message. Audio opening Refer to “4.5 Audio Alarms” of NV-120 series instruction manual for operation. Battery case Comprise a backup power supply unit (backup battery x 2 pcs)

  • Page 19: Main Unit (Interior Appearance)

    2 Unit Structure Main Unit (Interior Appearance) 2.2.2 Do not touch the jumper pins inside. They are for device setting. Do NOT touch these pin sockets. They are for setting the jumper pins inside. Item Component Description Power switch Press to turn on/off the unit. Fuse holder Houses a 2A fuse.

  • Page 20: Lcd

    2 Unit Structure 2.2.3 HOME （Gas-monitoring） Target gas: Gas other than oxygen Target gas: Oxygen Item Component Description Gas concentration bar graph Displays the gas concentration and alarm set values. 1st stage gas alarm set value Displays the 1st stage gas alarm set value with orange line. 2nd stage gas alarm set value Displays the 2nd stage gas alarm set value with red line.

  • Page 21: Terminal Blocks

    2 Unit Structure Terminal Blocks 2.2.4 Models: Models: NV-120Sx, NV-120Dx Terminal Identifier Description AC type: 100 to 240 VAC R (P) DC type: 24 VDC (+) Power AC type: 100 to 240 VAC (Input) S (N) DC type: 24 VDC (-) Earth Earth (Earth terminal)
  • Page 22 2 Unit Structure Contact Outputs Outputs to external devices (e.g., signal towers, alarm horns, etc.) are referred as “contact outputs”. NOTICE  Contacts use mechanical relays, which can activate on exposure to magnet force. Install the product in a place free from a magnetic field. Do not use a magnet in the vicinity of the product.

  • Page 23: System Configuration

    Use a protective cover (sold separately) for the gas detector for outdoor installation. Refer to the gas detector’s instruction manual for details.  Wiring differs depending on a connected gas detector.  Refer to the NV-120 series instruction manual for installation for wiring procedure.

  • Page 24: Operation

    4 Operation Operation This section provides information and details the procedures for using this product.  Operation at power-up  Operation mode after power-up  Gas alarm operation and clearance method  Operation in the event of a fault  Voice message and beep sound ...

  • Page 25: Power-Off

    4 Operation Set the power switch to the on position. Power switch When the warm-up cycle is completed, the unit will enter the gas-monitoring mode NOTE (normal operation). Ref. Refer to “4.2.1 Power-up” for details about the warm-up operation. Check that the backup power switch is in the on position (for your backup power type unit).

  • Page 26: Operation Flow At Power-Up

    4 Operation 4.2 Operation Flow at Power-up The power-up operation flow is as follows: Power-up → Warm-up →Gas-monitoring mode (HOME screen) Refer to “4.2.1 Power-up” for information on the warm-up and normal operation. Ref. Refer to “4.3 Gas Alarm Operation” for operation while a gas alarm is activated. Power-up (Warm-up) 4.2.1 ...
  • Page 27 4 Operation  Refer to “5.2 Maintenance Mode” for information on the display indication and NOTE outputs during the maintenance mode.  The warm-up cycle lasts approx. 30 to 600 seconds (as per the delivery specifications) once the unit is powered. ...

  • Page 28: Gas Alarm Operation

    4 Operation 4.3 Gas Alarm Operation This section explains the operation when a gas alarm activates as well as the method to clear a gas alarm. Gas Alarm Operation during Normal Operation 4.3.1 If the gas concentration or test value exceeds a preset value, a gas alarm will activate. The background color changes depending on the alarm level.

  • Page 29: Gas Alarm Operation During Maintenance Mode

    4 Operation Gas Alarm Operation during Maintenance Mode 4.3.2 This section explains the unit operation when a gas alarm activates while in the maintenance mode. Alarm operation during maintenance modes 1 and 2 If a gas concentration or test value exceeds the alarm set value, a gas alarm will activate. Maintenance mode 1 Maintenance mode 2 Indication/output...

  • Page 30: Gas Alarm Clearance Method

    4 Operation Gas Alarm Clearance Method 4.3.3 （ 1 ） Auto-resetting and Manual-resetting There are two methods to clear the gas alarm and specified at order placement. Clearance Description method When the gas concentration falls below (exceeds) the “gas alarm set value minus (or plus) 2% of full scale value”...

  • Page 31: Operation In Event Of Failure

    4 Operation 4.4 Operation in Event of Failure This unit can detect an internal failure. The amber FAULT LED, LCD, and fault contact will activate depending on the nature of the failure. The corresponding error code will be displayed on the LCD. Indication/output Normal operation In the event of a failure...

  • Page 32: Voice Message

    4 Operation Voice Message 4.5.1 The unit can select up to two languages (1st and 2nd languages) for voice message. Refer to “5.6.1 (4) Spoken Language”. Example: When Japanese and English are selected as the 1st and 2nd languages respectively, the audio alarm cycles through in the following sequence if a 1st stage gas alarm is present.

  • Page 33: Bz Stop/Reset Button

    4 Operation 4.6 BZ STOP/RESET Button The BZ STOP/RESET has two key operations. (1) Audio alarm mute To mute the audio alarm (beep sound and voice message), press the BZ STOP/RESET button. ● In the event of a gas alarm The flashing BZ STOP/RESET LED will become steadily lit, and the audio alarm will be muted.

  • Page 34: Backup Power Type

    4 Operation 4.7 Backup Power Type A unit with two backup batteries is referred to as “backup power type”. In the event of a power outage, the backup batteries will provide emergency power to the unit for continuous gas-monitoring during the power outage. In the event of a power outage, the BATT LED will start flashing, and the backup batteries will provide power to the unit for continuous gas-monitoring operation.

  • Page 35: Continuous And Intermittent Gas-Monitoring Modes

    4 Operation Continuous and Intermittent Gas-monitoring Modes 4.7.2 Models: NV-120Ci and NV-120Cv The unit will continue gas-monitoring for 120 minutes after a power outage breaks out, followed by intermittent gas-monitoring (10-second gas-monitoring at 15-minute intervals). However, if the unit falls into a gas alarm status during the intermittent gas-monitoring mode, the mode will switch to the continuous gas-monitoring mode.

  • Page 36: Operation Menus

    5 Operation Menus Operation Menus 5.1 Overview of Operation Menus This product has the menus shown in the table below. Menu Description Sets the maintenance mode to: Off: Maintenance mode is off. Maintenance Mode Maint.1: Maintenance mode 1 is on. Maint.2: Maintenance mode 2 is on.

  • Page 37: Access To Main Menu

    5 Operation Menus Access to Main Menu 5.1.2 To go to the Main Menu, press the MENU/CANCEL button while on the HOME screen.  If the lock icon is displayed on the top left corner of the screen, the menus are NOTE locked.

  • Page 38: Menu Operation

    5 Operation Menus Menu Operation 5.1.4 Turn the jog dial to select a desired item. The selected item is highlighted in white. Enter the ENT button to confirm the selection and access that item. Turn the jog dial to operate each item. Press the ENT button for confirmation.

  • Page 39: Deactivate Safety Lock

    5 Operation Menus Deactivate Safety Lock 5.1.5 The safety lock disables the buttons and the jog dial to prevent unintended operation. The lock icon is shown on the top left corner of the screen while the lock is activated (locked). To deactivate the safety lock, simultaneously press and hold the MENU/CANCEL and ENT buttons until the lock icon disappears.

  • Page 40: Enter Maintenance Mode

    5 Operation Menus Enter Maintenance Mode 5.2.1 Deactivate the safety lock. The Main Menu will be displayed. Select the maintenance mode. The selected item will be highlighted in white. Press the ENT button. Turn the jog dial to select the mode. The selected item will be highlighted in white.

  • Page 41: Exit Maintenance Mode

    5 Operation Menus Press and hold the ENT button for confirmation. The selected mode will be set, and the screen will return to the Main Menu. “Maintenance mode 1” is on, and the corresponding icon is displayed. Exit Maintenance Mode 5.2.2 Select the maintenance mode while Maintenance mode 1 or 2 is on.

  • Page 42: Test Mode

    5 Operation Menus Press and hold the ENT button. The maintenance mode will be cancelled and the screen will return to the Main Menu. Up to step 2, it is possible to cancel the operation by pressing the CANCEL button. NOTE The screen will return to the Main Menu.
  • Page 43 5 Operation Menus Press the ENT button. The unit will enter the test mode. “ The simulated gas concentration (test value) is 0” by default. NOTE “ The simulated oxygen concentration (test value) is 20.9 vol%” by default. Turn the jog dial to set the reading (test value) to a desired value. The reading can be changed from –10% to 110% of the full scale.

  • Page 44: Battery Voltage Test

    5 Operation Menus To exit the test mode, press and hold the ENT button or press the CANCEL button.  If the CANCEL button is pressed, the test value will not be saved and the screen will return to the Main Menu. ...
  • Page 45 5 Operation Menus Press the ENT button. The battery voltage test will start. “Testing in progress” is displayed during the battery voltage test. When the battery voltage test is completed, the test result will be displayed. Good Charge needed Replacement needed Message on screen Battery condition Description...

  • Page 46: Calibration Menu

    5 Operation Menus 5.5 Calibration Menu The Calibration Menu is used to perform zero and span adjustments on this product. Operation Procedure Deactivate the safety lock. The Main Menu will be displayed. Select “Calibration Menu”. The selected item will be highlighted in white. Press the ENT button.

  • Page 47: Manual Zero Adj

    5 Operation Menus  For units with a zero suppression (or 20.9 suppression) function, the bar graph display will continue to indicate “0” (or 20.9 vol%) until the target gas concentration detected by the detector exceeds the pre-set value. The pre-set value is given in NOTE the delivery specifications.
  • Page 48 5 Operation Menus Item Component Description/function Reading Displays the currently measured gas concentration. Increment/decrement unit Displays the increment/decrement unit. Button Operation Button/dial Operation Press to change the increment/decrement unit. Each press of the ENT button cycles through unit options (1, 5, 10, 100, 1000). ENT button Press and hold to confirm the setting.
  • Page 49 5 Operation Menus Press and hold the ENT button for confirmation. To execute, select “OK”. To return to the previous step, select “Cancel”. Select “OK” and press the ENT button. A zero adjustment will start. “Adjustment now...” is displayed while zero adjustment is in progress. A successfully completed zero adjustment displays the following screen.

  • Page 50: Auto Zero Adj

    5 Operation Menus  Up to step 7, it is possible to cancel the zero adjustment by pressing the CANCEL NOTE button.  If error code “E-19” or “E-20” is displayed, refer to “7 Error Codes and Solutions”. Auto Zero Adj. 5.5.2 This is to automatically adjust the reading to zero.
  • Page 51 5 Operation Menus Select “OK” and press the ENT button. A zero adjustment will start. “Adjustment now...” is displayed while zero adjustment is in progress. A successfully completed zero adjustment displays the following screen. Press the CANCEL button. The screen will return to the Calibration Menu. ...

  • Page 52: Manual Span Adj

    5 Operation Menus Manual Span Adj. 5.5.3 This is to perform a span adjustment by using calibration gas. NOTICE  A span adjustment requires a special attention because actual gas is used. It must be performed by New Cosmos authorized service personnel. ...
  • Page 53 5 Operation Menus Item Component Description/function Current reading Displays the currently measured gas concentration. Displays the currently measured gas concentration in bar graph Current bar graph form. Target reading Displays the target reading. Set the target reading with jog dial. Target bar graph Displays the target reading in bar graph form.
  • Page 54 5 Operation Menus Select “OK” and press the ENT button. A span adjustment will start. “Adjustment now...” is displayed while span adjustment is in progress. A successfully completed span adjustment displays the following screen. Press the CANCEL button. The screen will return to the Calibration Menu. ...

  • Page 55: Span Adj. (Fixed)

    5 Operation Menus Span Adj. (fixed) 5.5.4 This is to perform a span adjustment by using the calibration gas 1.6 times higher than the 1st stage gas alarm set value. NOTICE  A span adjustment requires a special attention because actual gas is used. It must be performed by New Cosmos authorized service personnel.
  • Page 56 5 Operation Menus Apply the calibration gas (1.6 times higher than the 1st stage gas alarm set value) to the gas detector (sensor) and allow the gas concentration to become fully stable. Item Component Description/function Current reading Displays the currently measured gas concentration. Displays the currently measured gas concentration in bar Current bar graph graph form.
  • Page 57 5 Operation Menus Select “OK” and press the ENT button. A span adjustment will start. “Adjustment now...” is displayed while span adjustment is in progress. A successfully completed span adjustment displays the following screen. Press the CANCEL button. The screen will return to the Calibration Menu. ...

  • Page 58: Auto Span Adj

    5 Operation Menus Auto Span Adj. 5.5.5 This is to perform a span adjustment by using calibration gas. NOTICE  A span adjustment requires a special attention because actual gas is used. It must be performed by New Cosmos authorized service personnel. ...
  • Page 59 5 Operation Menus Item Component Description/function Current reading Displays the currently measured gas concentration. Displays the currently measured gas concentration in bar graph Current bar graph form. Target reading Displays the target reading. Set the target reading with jog dial. Target bar graph Displays the target reading in bar graph form.
  • Page 60 5 Operation Menus A successfully completed span adjustment displays the following screen. Press the CANCEL button. The screen will return to the Calibration Menu.  Up to step 7, it is possible to cancel the zero adjustment by pressing the CANCEL NOTE button.

  • Page 61: Span Adj. (20.9 Vol%)

    5 Operation Menus Span Adj. (20.9 vol%) 5.5.6 This is to automatically set the span to 20.9 vol%. It is used only when the target gas is oxygen. NOTICE  A span adjustment requires a special attention because actual gas is used. It must be performed by New Cosmos authorized service personnel.
  • Page 62 5 Operation Menus Item Component Description/function Current reading Displays the currently measured gas concentration. Displays the currently measured gas concentration in bar Current bar graph graph form. Target reading Displays the target reading “20.9%”. Target bar graph Displays the target reading in bar graph form. Press the ENT button.

  • Page 63: Clear Span Adj. (20.9 Vol%)

    5 Operation Menus A successfully completed span adjustment displays the following screen. Press the CANCEL button. The screen will return to the Calibration Menu.  Up to step 7, it is possible to cancel the zero adjustment by pressing the CANCEL NOTE button.
  • Page 64 5 Operation Menus Button Operation Button/dial Operation ENT button Press and hold to confirm the selection. Press to cancel the current operation and return to the Calibration MENU/CANCEL button Menu. Jog dial Turn to select the desired item. Turn the jog dial to select “Yes”. Press and hold the ENT button to confirm the selection.

  • Page 65: Device Setting Menu

    5 Operation Menus 5.6 Device Setting Menu From the Device Setting Menu, it is possible to adjust device and alarm setups. This menu should only be operated by supervisor. Incorrect setting may cause incorrect operation. Operation Procedure Deactivate the safety lock. The Main Menu will be displayed.
  • Page 66 5 Operation Menus Press the ENT button. The unit will enter the Device Setting screen. There are the following five items. Item Description/function Alarm Volume Adjusts the sound level of beeping and voice message. Voice Message Turns on/off (unmute/mute) the voice message. Beep Sound Turns on/off (unmute/mute) the beep sound.
  • Page 67 5 Operation Menus Button Operation Button/dial Operation Press to view the value. ENT button Press and hold to confirm the set value. Press to cancel the current operation and return to the Device Setting MENU/CANCEL button screen. Jog dial Turn to set the value. Turn the jog dial to set the value.
  • Page 68 5 Operation Menus Press the ENT button. The unit will enter the Voice Message screen. Button Operation Operation Button/dial ENT button Press and hold to confirm the selection or setting. MENU/CANCEL Press to cancel the current operation and return to the Device Setting button screen.
  • Page 69 5 Operation Menus （ 3 ） Beep Sound On/Off This item is used to turn on/off (unmute/mute) the beep sound. Operation Procedure Deactivate the safety lock. The Main Menu will be displayed. Select “Device Setting Menu”. The selected item will be highlighted in white. Press the ENT button.
  • Page 70 5 Operation Menus Select “OK” and press the ENT button. The selection (beep sound on/off status) will be saved. The screen will return to the Device Setting screen. （ 4 ） Spoken Language This item is used to select the languages for voice message. Operation Procedure Deactivate the safety lock.
  • Page 71 5 Operation Menus Button Operation Button/dial Operation Press to move to the next screen. ENT button Press and hold to confirm the selection or setting. Press to cancel the current operation and return to the Device Setting MENU/CANCEL button screen. Jog dial Turn to select the desired item.

  • Page 72: Alarm Setting

    5 Operation Menus Alarm Setting 5.6.2 This is to set the alarm set values. NOTICE The alarm set values cannot be set while a gas alarm is activated. Operation Procedure Deactivate the safety lock. The Main Menu will be displayed. Select “Device Setting Menu”.
  • Page 73 5 Operation Menus Select “AL1 Set Value” The selected item will be highlighted in white. Press the ENT button. The unit will enter the AL1 Set Value screen. Item Component Description/function 1st stage gas alarm set value Sets the 1st stage gas alarm set value. Increment/decrement unit Displays the increment/decrement unit.
  • Page 74 5 Operation Menus Select “OK” and press the ENT button. The 1st stage gas alarm set value will be set. The screen will return to the Alarm Setting screen. （ 2 ） AL2 Set Value This sets the 2nd stage gas alarm set value. Operation Procedure Deactivate the safety lock.
  • Page 75 5 Operation Menus Item Component Description/function 2nd stage gas alarm set value Sets the 2nd stage gas alarm set value. Increment/decrement unit Displays the increment/decrement unit. Button Operation Button/dial Operation Press to change the increment/decrement unit. Each press of the ENT button cycles through unit options (1, 5, 10, 100, 1000).

  • Page 76: Information

    5 Operation Menus 5.7 Information Form the information menu, the setup details and alarm/fault event history can be viewed. Operation Procedure Deactivate the safety lock. The Main Menu will be displayed. Select “Information”. The selected item will be highlighted in white. Press the ENT button.

  • Page 77: Configuration Data

    5 Operation Menus Configuration Data 5.7.1 The setup details can be viewed from this menu. Operation Procedure Deactivate the safety lock. The Main Menu will be displayed. Select “Information”. The selected item will be highlighted in white. Press the ENT button. The unit will enter the Information screen.

  • Page 78: Event History

    5 Operation Menus Event History 5.7.2 The alarm or fault events of this product can be reviewed from this menu. Up to 30 events can be viewed. Operation Procedure Deactivate the safety lock. The Main Menu will be displayed. Select “Information”. The selected item will be highlighted in white.

  • Page 79: Maintenance

    6 Maintenance Maintenance This chapter explains the routine check, periodical inspection and part replacement procedure. 6.1 Routine Check and Periodical Inspection Routine checks are carried out by the user, while periodical inspections are performed by New Cosmos or its authorized representative. Action by Frequency Check item...

  • Page 80: Fuse Replacement

    6 Maintenance Fuse Replacement 6.1.1  Set the power switch to the off position before fuse replacement. Fuse replacement with the power on may cause injury or device failure.  Use the specified fuse. Turn and loosen the knurled screw of the cover counterclockwise. Open the cover. Hold the cover with your hand while opening/closing it.

  • Page 81: Battery Replacement

    6 Maintenance Battery Replacement 6.1.2 The battery life is about two years from the month of manufacture. Use the specified batteries. Set the power switch to the off position before battery replacement. Observe the following precautions for safe use of batteries. Incorrect use of batteries may cause them to leak, heat, ignite or explode.
  • Page 82 6 Maintenance Set the backup power switch to the off position. Set the power switch to the off position. Backup power switch Power switch Remove the screw from the battery case. Remove the battery lid. Battery lid Pull the two batteries. Disconnect the two battery connectors from the connectors on the unit.

  • Page 83: Ac-Dc Power Supply Unit Replacement

    6 Maintenance Insert two new batteries into the unit. Connect the two connectors. Push and completely insert the batteries. Attach the battery lid to the unit. Set the backup power switch to the on position. Set the power switch to the on position. AC-DC Power Supply Unit Replacement 6.1.3 The service life of the AC-DC power supply unit is five years from the month of manufacture.
  • Page 84 6 Maintenance Battery replacement should be performed by service personnel, neither operator nor supervisor. Turn and loosen the knurled screw of the cover counterclockwise. Open the cover. Hold the cover with your hand while opening/closing it. Flinging the cover may cause injury or product damage such as a broken LCD.
  • Page 85 6 Maintenance Loosen the two screws. Slide the switching cover up. Switching cover Screw (2 places) Disconnect the two connectors from the AC-DC power supply unit. Detach the switching cover from the unit. Connector (2 places) Remove the two screws that attach the AC-DC power supply unit to the cover. Replace the AC-DC power supply unit with a new one.

  • Page 86: Error Codes And Solutions

    7 Error Codes and Solutions Error Codes and Solutions This product has a self-diagnosis function, and if a problem occurs with the device, the corresponding error code will be displayed to alert the user along with a beeping sound or a voice message. If a code other than the ones listed is displayed or if the problem persists after performing the corresponding solution, please contact New Cosmos or its authorized representative.

  • Page 87: Troubleshooting

    8 Troubleshooting Troubleshooting Before requesting repair, please refer to the table below. If the product does not return to normal operation after performing the corresponding steps in the table or if your issue is not found in the table, consult New Cosmos or its authorized representative. If the product goes into any unintended mode during adjustment or setting, cease using the product and consult with your supervisor.

  • Page 88: Specifications

    9 Specifications Specifications Product Single-point gas alarm system NV-120C NV-120S NV-120Mx NV-120Ci NV-120Hv NV-120Hi NV-120Dx Model Detection Electroche Galvanic (4-20mA Catalytic Hotwire semiconductor principle mical cell input) As per Target gas connected Combustible gas Toxic gas Oxygen gas detector Detection As per connected gas detector range Power...
  • Page 89 9 Specifications Operating 0 to 90%RH No condensation. humidity Mounting Wall-mounting or panel-mounting method Ingress IP2X when installed protection Without intermittent In the event of a power outage, the unit will continue continuous gas-monitoring mode gas-monitoring for another 120 minutes or more. In the event of a power outage, the unit will continue continuous Backup gas-monitoring for another 120 minutes, followed by intermittent...

  • Page 90: Warranty

    10 Warranty Warranty The warranty period is one (1) year from the date of purchase. You are entitled to the limited warranty, if the product malfunctions due to a manufacturing defect during normal use in accordance with the instruction manual, specifications and labels. Warranty Scope If the product fails or is found to be damaged due to a manufacturing defect during the warranty period, and used in accordance with the instruction manual and specifications, we will provide a free...

  • Page 91: Glossary

    11 Glossary Glossary Term Definition Alarm unit Device that indicates the gas concentration and activates an alarm according to the signals received from a connected gas detector. Backup power supply Battery unit that provides emergency power to the product when the input unit power source or main power fails.
  • Page 92 GAE-154-01 October 2021 GAE-154-02 GAE-154-03 September 2022 Additional copies of this instruction manual may be purchased. Contact New Cosmos or its authorized representative to order. Authorized representative: Manufacturer: NEW COSMOS ELECTRIC CO., LTD. 2-5-4 Mitsuya-naka, Yodogawa-ku, Osaka 532-0036, Japan http://www.new-cosmos.co.jp...

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