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RKI Instruments CO-04C Operator's Manual

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CO-04C
Operator's Manual
Part Number: 71-0522
Revision: P2
Released: 5/24/21
www.rkiinstruments.com

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  • Page 1 CO-04C Operator’s Manual Part Number: 71-0522 Revision: P2 Released: 5/24/21 www.rkiinstruments.com...
  • Page 2 WARNING Read and understand this instruction manual before operating instrument. Improper use of the gas monitor could result in bodily harm or death. Maintenance of the gas monitor is essential for proper operation and correct readings. Bump test the instrument before each day’s use with a known concentration of the target gas.

  • Page 3: Table Of Contents

    Turning On the CO-04C ........
  • Page 4 User ID Screen (USER ID)..........29 Station ID Screen (STN ID) .
  • Page 5 Performing a Bump Test (BUMP) ......... . 82 Setting Alarms to Latching or Self-Resetting (LATCH) .

  • Page 6: Chapter 1: Introduction

    Chapter 1: Introduction Overview This chapter briefly describes the CO-04C gas monitor. This chapter also describes the CO-04C Operator’s Manual (this document). Table 1 at the end of this chapter lists the specifications for the CO-04C. About the CO-04C Using an advanced detection system, the CO-04C personal gas monitor detects the presence of carbon monoxide (CO).

  • Page 7: Specifications

    25 ppm Alarm Factory Setting 50 ppm Alarm H Factory Setting 1200 ppm STEL Alarm 200 ppm TWA Alarm 25 ppm Table 2: CO-04C Specifications Sampling Diffusion Method Response Time T90 Within 10 Seconds Display Graphics LCD Display Operating °...

  • Page 8: About This Manual

    Approximately 67(H) x 54(W) x 24(D) mm (2.6”H x 2.1”W x 0.9”D) and Weight Approximately 93 g (3.3 oz.) About this Manual The CO-04C Operator’s Manual uses the following conventions for notes, cautions, and warnings. NOTE: Describes additional or critical information. CAUTION: Describes potential damage to equipment.

  • Page 9: Chapter 2: Description

    A digital LCD (liquid crystal display) is visible through a clear plastic window in the top case. The LCD shows the gas reading. The LCD also shows information for each of the CO-04C’s operating modes. 04 Series for CO(-H2)

  • Page 10: Control Buttons

    User, Maintenance, or Gas Select Mode. Vibrator A vibrating motor inside the CO-04C case vibrates for gas alarms and unit malfunctions. NOTE: If STEALTH is set to ON, the vibrator only functions when VIB in the STEALTH Gas Select Mode item is set to ON (see pg.91).

  • Page 11: Filters

    Batteries 2 AAA batteries (alkaline or Ni-MH) power the CO-04C. At 25°C alkaline batteries will last at least 6,200 hours (258 days) and Ni-MH batteries will last at least 4,200 hours (175 days). The battery icon in the upper right of the LCD shows remaining battery life.

  • Page 12: Standard Accessories

    An alligator clip installs to 2 spring bars on the rear case. Use the alligator clip to attach the CO-04C to clothing or a belt. Teeth in the alligator clip’s jaws prevent slipping. The alligator clip can be rotated to change the instrument’s orientation.

  • Page 13: Optional Accessories

    Optional Accessories Belt Clip The belt clip installs to 2 spring bars on the rear case and is used to easily clip the CO-04C onto a belt. Belt Clip Figure 4: Belt Clip Wrist Strap The wrist strap connects to a feature on the back case.

  • Page 14: Chapter 3: Measuring Mode

    Measuring Mode. Start Up This section explains how to start up the CO-04C, get it ready for operation, and turn it off. Turning On the CO-04C To illustrate certain functions, the following description of the CO-04C start up sequence assumes that the following items in User Mode are turned on: LUNCH, CAL.RMDR, and...
  • Page 15 None tone tone Action • Option A, Perform calibration: The CO-04C cannot be used until • Option A, Perform calibration: Press and release POWER a successful calibration is per- If you want to enter User MODE to enter User Mode formed.
  • Page 16 None tone tone Action • Option A, Perform bump test: The CO-04C cannot be used • Option A, Perform bump test: Press and release POWER until a successful bump test is If you want to enter User MODE to enter User Mode performed.
  • Page 17 Station ID Screen. USER U_ID_001 S_ID_001 9. If the CO-04C experiences a sensor failure during start up, a screen indicating that the sensor failed appears and the buzzer sounds a double pulsing tone once per second. FAIL SENSOR You cannot acknowledge the failure and continue to Measuring Mode.

  • Page 18: Performing A Demand Zero

    (if KEY.TONE is set to ON in User Mode). 4. Continue to hold AIR until the LCD prompts you to release it. The CO-04C sets the fresh air reading. Start up is complete and the unit is now ready for monitoring.

  • Page 19: Turning Off The Co-04C

    4. If Password Protection is turned On (factory setting is Off) using the 04 Series Setup Program, a user-set password is required to turn off the CO-04C. When the password screen appears, adjust each digit with the AIR button and press and release the POWER MODE button to move on to the next digit.

  • Page 20: Measuring Mode Operation

    OFF, the CO-04C gives periodic indications to confirm that it’s operating or to indicate a non-compliance (see pg.59). Monitoring an Area 1. Start up the CO-04C as described above in “Start Up” on page 14. It is now in Measuring Mode. 2. The instrument displays the CO reading. The H reading is not displayed but “H2 RICH”...

  • Page 21: Alarms

    Alarm Indications The CO-04C buzzer sounds an alarm, the LED flashes, and the vibrator pulses when any sort of alarm condition or failure occurs. If the CO-04C is operating in Stealth Mode, the buzzer does not sound and the vibrator’s operation depends on the VIB setting in Gas Select Mode’s STEALTH item.
  • Page 22 Table 4: Alarm Types and Indications Alarm Type Visual Indications Other Indications H2 RICH • H2 and rich alternate on the top line • High-low tone sounds twice per second • OVER appears at the bottom of the Concentration of hydrogen rises •...

  • Page 23: Responding To Alarms

    AVERTISSEMENT:Un dépassement de la plage peut indiquer une concentration extrême en monoxyde de carbone ou une concentration en explosif. Confirmez la concentration de gaz avec un CO-04C différent ou avec un autre dispositif de détection de gaz. 1. Follow your established procedure for an extreme gas condition.
  • Page 24 “Replacing the Batteries (Alkaline or Ni-MH)” on page 66. The CO-04C is fully functional during a low battery warning. However, only a couple of days of operating time remain. The amount of time depends on LCD backlight use and alarm frequency.
  • Page 25 2. Attempt to set the date using the DATE item in User Mode (see pg.63). 3. If the date cannot be set correctly, contact RKI Instruments, Inc. as soon as possible. Responding to System Failure Alarms 1. If a system failure occurs, the system failure screen displays an error code as shown...

  • Page 26: Data Logging

    The data logging capacity depends on how often the CO-04C stores data and how often the CO-04C is turned on and off. The table below illustrates how much data logging time is available for the various interval times.

  • Page 27: Chapter 4: Display Mode

    Chapter 4: Display Mode This section describes Display Mode which is accessible from Measuring Mode. See Table 7 below for a list of Display Mode’s menu items, a short description of each item, and the page number for further description. Table 7: Display Mode Menu Items Display Mode Description...

  • Page 28: Peak Screen (Peak)

    The peak reading is stored until a higher level is detected, the peak reading is cleared, or the CO-04C is turned off. The lunch break feature enables the CO-04C to save the peak reading when it is turned off so it can continue with the same peak when it is turned on again (see pg.14).

  • Page 29: Twa Screen (Twa)

    DISP in Maintenance Mode is set to ON (factory setting is OFF). Use this screen to select a user ID from the 128 user IDs that are stored in the CO-04C’s memory. Before a user ID is selected on a brand new instrument, the user ID is “----------”.

  • Page 30: Station Id Screen (Stn Id)

    DISP in Maintenance Mode is set to ON (factory setting is OFF). Use this screen to select a station ID from the 128 station IDs that are stored in the CO-04C’s memory. Before a station ID is selected on a brand new instrument, the station ID is “----------”.

  • Page 31: Last Successful Bump Test Screen (Bp.data)

    2. Press AIR to enter the CAL.DATA screen. The date of the last successful calibration displays. 2019 10.24 CAL .DATA 3. Press and release POWER MODE to return to the CAL.DATA screen in Display Mode. Last Successful Bump Test Date (BP.DATA) The BP.DATA screen shows the date of the last successful bump test.

  • Page 32: Temperature Screen (Temp)

    Temperature Screen (TEMP) The TEMP screen shows the surrounding area’s temperature. TEMP Alarm Points Screen (ALARM--P) The Alarm Points Screen shows the gas alarm settings. 1. After entering Display Mode, press and release POWER MODE until the ALARM--P screen sequence appears. DISP DISP DISP...

  • Page 33: Adjusting The Buzzer Volume (Buzz.vol)

    Adjusting the Buzzer Volume (BUZZ.VOL) The BUZZ.VOL screen allows you to adjust the volume of the instrument’s buzzer. This screen only appears if DISP.SET in User Mode is set to ON (factory setting). HI (factory setting): Buzzer volume is high. LO: Buzzer volume is low.

  • Page 34: Chapter 5: User Mode And Calibration

    Chapter 5: User Mode and Calibration Overview This section describes the CO-04C in User Mode. See Table 8 below for a list of the items found in User Mode, the page that the item’s instructions can be found on, and a short description of the item.
  • Page 35 Table 8: User Mode Menu Items User Mode Description Menu Item CAL SET (cont’d) CAL.EXPD Defines what action must be taken if a calibration is due upon startup. (pg.53) CONFIRM (factory setting): Press and release AIR to acknowledge that calibration is due and continue to Measuring Mode. CANT.USE: Cannot enter Measuring Mode until a successful calibra- tion is performed.
  • Page 36 ON: User Mode is password-protected. Factory-set password is 0405. OFF (factory setting): User Mode is not password-protected. ROM/SUM View the firmware information for the CO-04C’s sensor board and main board. (pg.64) START (pg.64) Press and release POWER MODE to begin the warmup sequence and enter Measuring Mode.

  • Page 37: Entering User Mode

    The CO-04C is not in operation as a gas detector while in User Mode. 1. Take the CO-04C to a non-hazardous location and turn it off if it is on. 2. Press and hold AIR, then press and hold POWER MODE. When you hear a beep, release the buttons.

  • Page 38: Tips For Using User Mode

    • Calibration cup 1. Confirm that the CO-04C’s calibration gas value matches the concentration listed on the calibration gas cylinder as described on pg.49. 2. Confirm that the regulator knob is turned all the way clockwise. Screw the 0.25 LPM fixed flow regulator onto the calibration cylinder.
  • Page 39 3. Install the calibration cup onto the CO-04C. Be sure the calibration cup is installed in the correct direction and that it is pushed on all the way. POW ER MODE Side View Front View 4. Use the tubing to connect the regulator to the inlet of the calibration cup (labeled “IN”).
  • Page 40 6. Use AIR to scroll to START and press and release POWER MODE to enter and release POWER MODE to enter Measuring Mode. Measuring Mode. 7. Calibrate the CO-04C as soon as possible. 40 • Chapter 5: User Mode and Calibration 04 Series for CO(-H2)
  • Page 41 Option C from Flow Chart Option D from Flow Chart • Bump test failed • Bump test failed • A-CAL set to ON (factory setting) • A-CAL set to ON (factory setting) • Calibration passed • Calibration failed 1. A calibration immediately and 1.

  • Page 42: Performing A Calibration (Gas Cal)

    (A-CAL or E-CAL). • The CO-04C can be calibrated using either A-CAL or E-CAL depending on the setting of the E-CAL User Mode item. A-CAL (appears if E-CAL User Mode item is set to OFF): Apply gas for a period of time, then press and release POWER MODE to perform the adjustment.
  • Page 43 2. Confirm that the regulator knob is turned all the way clockwise. Screw the 0.25 LPM fixed flow regulator onto the calibration cylinder. 3. Install the calibration cup onto the CO-04C. Be sure the calibration cup is installed in the correct direction and that it is pushed on all the way.
  • Page 44 Performing a Span Adjustment 1. While in User Mode, press AIR to scroll to GAS CAL. GAS CAL 2. Press and release POWER MODE. The AIR item appears. 3. Use AIR to scroll to the A-CAL item. A-CAL 4. Press and release POWER MODE. The display shows the gas assigned to Cylinder A and its assigned calibration value (see pg.49 if the calibration value does not match the calibration gas cylinder’s concentration).
  • Page 45 11. The table below describes the 2 calibration outcomes. Calibration Passed Calibration Failed 1. The instrument indicates that the 1. The instrument indicates that the calibration passed. calibration failed. PASS FAIL A-CAL A-CAL 2. Close the regulator. 2. The instrument shows the current gas 3.
  • Page 46 2. Confirm that the regulator knob is turned all the way clockwise. Screw the 0.25 LPM fixed flow regulator onto the calibration cylinder. 3. Install the calibration cup onto the CO-04C. Be sure the calibration cup is installed in the correct direction and that it is pushed on all the way.
  • Page 47 3. Use AIR to scroll to the E-CAL item. E-CAL 4. Press and release POWER MODE. The display shows the gas assigned to Cylinder A and its assigned calibration value (see pg.49 if the calibration value does not match the calibration gas cylinder’s concentration).
  • Page 48 11. The table below describes the 2 calibration outcomes. Calibration Passed Calibration Failed 1. The instrument indicates that the 1. The instrument indicates that the calibration passed. calibration failed. PASS FAIL E-CAL E-CAL 2. Close the regulator. 2. The instrument shows the current gas 3.
  • Page 49 Setting the Calibration Values in CAL--P 1. While in User Mode, press AIR to scroll to GAS CAL. GAS CAL 2. Press and release POWER MODE. The AIR item appears. 3. Use AIR to scroll to the A-CAL item (E-CAL if E-CAL in User Mode is set to ON). A-CAL 4.
  • Page 50 8. Press and release POWER MODE. The calibration value begins to flash. CAL-P Use AIR to adjust the calibration gas value. The calibration gas value in the instrument must match the value listed on the calibration gas cylinder you are using. Limits on the calibration gas value are shown in the table below.
  • Page 51 4. Press and release POWER MODE. The Auto Cal screen for the gas assigned to Cylinder A displays. A-CAL CYL A 5. Use AIR to scroll to CYL SEL. CYL SEL 6. Press and release POWER MODE. CO displays. CYL SEL 7.

  • Page 52: Setting Calibration Parameters (Cal Set)

    CAL .RMDR CAL.RMDR ON (factory setting): The CO-04C gives an indication at start up if it is due for calibration. The type of indication depends on the CAL.EXPD setting (see pg.53). OFF: The CO-04C does not give an indication at start up if it is due for calibration.

  • Page 53: Setting Bump Test Parameters (Bump.set)

    MODE to enter User Mode and perform a calibration. CANT.USE: The CO-04C gives an indication at start up that calibration is past due. Press and release POWER MODE to enter User Mode and perform a calibration. Pressing AIR has no effect.
  • Page 54 2. Press and release POWER MODE. The SETTING item appears. SETTING SETTING The SETTING menu has 5 items: GAS.TIME, CHECK, CAL.TIME, A-CAL, and ESCAPE. 1. After entering the BUMP.SET menu, press AIR to scroll to SETTING. SETTING 2. Press and release POWER MODE. The GAS.TIME item appears. GAS.TIME The GAS.TIME is the amount of time that the instrument is exposed to gas during a bump test.
  • Page 55 CAL.TIME is set to 90 seconds and the GAS.TIME is set to 30 seconds, if the bump test fails, the CO-04C is only exposed to gas for an additional 60 seconds. The available values are 90 seconds (factory setting), and 120 seconds.
  • Page 56 BP.RMDR ON: The CO-04C gives an indication at start up if it is due for bump testing. The type of indication depends on the BP.EXPD setting (see pg.56). If the instrument is not due for bump testing, a check mark appears in the lower left corner of the LCD.

  • Page 57: Alarm Settings (Alarm--P)

    1. After entering the BUMP.SET menu, press AIR to scroll to BP.EXPD. BP .EXPD 2. Press and release POWER MODE. The current setting flashes. 3. Use AIR to display the desired setting. 4. Press and release POWER MODE to save the setting and return to the BP.EXPD item in the BUMP.SET menu.
  • Page 58 3. The Warning setpoint flashes. 1200 For all settings: WARNING ALARM ALARM H 1) AIR to adjust 2) POWER MODE to save and continue STEL STEL ALARM-P 4. Use AIR to adjust the Warning setpoint. The alarm setpoint limitations are: 20 ppm WARNING ALARM...

  • Page 59: Updating The Lunch Break Setting (Lunch)

    TWA and PEAK readings and the time in operation from the last time the CO-04C was used or start collecting new readings and reset the time in operation. 1. While in User Mode, press AIR to scroll to LUNCH.
  • Page 60 LED+BUZ: The CO-04C’s LED double flashes and the buzzer double beeps as often as defined by the BEEP.INT parameter to verify that the instrument is operating. BMP/CAL: If a bump test or a calibration is due and if BP.EXPD or CAL.EXPD is set to CONFIRM (factory setting) or NONE, the CO-04C’s LED double flashes as often as defined...

  • Page 61: Updating The Backlight Time (Bl Time)

    Updating the Backlight Time (BL TIME) This setting defines how long the LCD backlight stays on when you press any button. The minimum setting is OFF; the maximum setting is 255 seconds. The factory setting is 30 seconds. 1. While in User Mode, press AIR to scroll to BL TIME. BL TIME 2.

  • Page 62: Zero Suppression (Zero.sup)

    2. Press and release POWER MODE. The current setting flashes. 3. Use AIR to display the desired setting. 4. Press and release POWER MODE to save the setting and return to the DISP.SET item in User Mode. 5. See “Entering Measuring Mode (START)” on page 64 to enter Measuring Mode. Zero Suppression (ZERO.SUP) This item only appears if ZSUP.DSP is set to ON in Maintenance Mode (factory setting is OFF).

  • Page 63: Setting The Date/Time (Date)

    6. See “Entering Measuring Mode (START)” on page 64 to enter Measuring Mode. Turning the Password On/Off (PASS-W) ON: The CO-04C prompts you for a password when you enter User Mode. The factory-set password is 0405 but it can be changed.

  • Page 64: Viewing The Rom/Sum (Rom/Sum)

    7. Press and release POWER MODE to enter the selection and advance to the next number. To go back a number, press and hold AIR and POWER MODE for a few seconds. 8. Repeat Step 6 and Step 7 to select the remaining numbers. When you press and release POWER MODE to enter the last number, the password is saved and the instrument returns to the PASS-W item in User Mode.

  • Page 65: Chapter 6: Maintenance

    Chapter 6: Maintenance Overview This chapter describes troubleshooting procedures for the CO-04C. It also includes procedures for replacing the batteries and replacing various consumable parts. WARNING: RKI Instruments recommends that service, calibration, and repair of RKI gas detectors be performed by personnel properly trained for this work.

  • Page 66: Replacing The Batteries

    WARNING: Use only Duracell MN2400 or PC2400 or Eneloop BK-4MCC batteries to maintain the QPS classification of the CO-04C. Use of other batteries will void the QPS classification and may void the warranty. Do not mix old/new or different types of batteries.
  • Page 67 2. Release the side of the alligator or belt clip that is opposite the hinge. You may need to o a screwdriver to pry it open. Figure 7: Releasing the Alligator or Belt Clip 3. Rotate the captive battery cover screw counterclockwise. Battery Cover Screw...
  • Page 68 1. Remove the batteries from the CO-04C as described in Step 1 - Step 5 on page 66. 2. Install the Ni-MH batteries in the charger. See the battery charger’s manual for charging instructions.

  • Page 69: Replacing The Charcoal Filter

    Replacing the Charcoal Filter 1. Verify that the CO-04C is off. 2. Remove the rubber boot, if installed. 3. Use a small Phillips screwdriver to unscrew the 4 screws that attached the front case to the rear case. Screw, 4x Figure 11: Unscrewing Case Screws 4.
  • Page 70 8. The charcoal filter sits in the middle of a black gasket. Pry the charcoal filter out of the gasket. Hydrophobic Filter Charcoal Filter Charcoal Filter Sensor Gasket Sensor Gasket Front Case Rear Case Instrument Side View Front Case Inside View Figure 13: Charcoal Filter Location 9.

  • Page 71: Replacing The Hydrophobic Filter

    Replacing the Hydrophobic Filter 1. Verify that the CO-04C is off. 2. Remove the rubber boot, if installed. 3. Use a small Phillips screwdriver to unscrew the 4 screws that attached the front case to the rear case. Screw, 4x Figure 14: Unscrewing Case Screws 4.
  • Page 72 9. Remove the white hydrophobic filter. Hydrophobic Filter Charcoal Filter Charcoal Filter Sensor Gasket Sensor Gasket Front Case Rear Case Instrument Side View Front Case Inside View Figure 16: Hydrophobic Filter Location 10. Install a new hydrophobic filter. 11. Reinstall the sensor gasket with the flat side facing the white hydrophobic filter. 12.

  • Page 73: Replacing The Sensor

    Replacing the Sensor 1. Verify that the CO-04C is off. 2. Remove the rubber boot, if installed. 3. Use a small Phillips screwdriver to unscrew the 4 screws that attached the front case to the rear case. Screw, 4x Figure 17: Unscrewing Case Screws 4.
  • Page 74 8. Install the new sensor in the socket on the rear case. The colored side faces away from the rear case and the slots in the sensor line up with tabs in the socket. CAUTION: Forcing a sensor into a socket without lining the sensor slots up with the socket tabs may damage the sensor or socket.

  • Page 75: Chapter 7: General Parts List

    Chapter 7: General Parts List Table 13 lists part numbers for the CO-04C’s replacement parts and accessories. Table 13: General Parts List Part Number Description 06-1248RK-03 Calibration kit tubing, 3 foot length 07-6033 Sensor gasket 10-1105-01 Screw, for securing front case to rear case...
  • Page 76 Table 13: General Parts List (cont.) Part Number Description 81-1051RK-25 Regulator, fixed flow, 0.25 LPM, with gauge and knob, for 34 liter aluminum, 58 liter, and 103 liter cylinders (cylinders with internal threads) 81-1146 Calibration cup 81-CO04C-LV Calibration kit: 34 liter steel cylinder of 50 ppm CO in N , 34 liter steel cylinder of 200 ppm , regulator, tubing, calibration cup, case ESR-A1CP-CO-H...

  • Page 77: Appendix A: Maintenance Mode

    OFF: You cannot manually perform a fresh air adjust in Measuring Mode by pressing AIR. A.ZERO (pg.83) ON: The CO-04C asks if you want to perform a fresh air adjustment at the end of the startup sequence. OFF (factory setting): The CO-04C does not ask if you want to perform a fresh air adjust- ment at the end of the startup sequence.

  • Page 78: Entering Maintenance Mode

    The CO-04C is not in operation as a gas detector while in Maintenance Mode. 1. Take the CO-04C to a non-hazardous location and turn it off if it is on. 2. Press and hold AIR, then press and hold POWER MODE. You will hear a beep after one second.

  • Page 79: Tips For Using Maintenance Mode

    4. The screen that appears depends on the setting of Maintenance Mode’s PASS-W item. If PASS-W is set to OFF, continue with Step 8. If PASS-W is set to ON (factory setting), continue with Step 5. 0000 BUMP PASS-W PASS-W set to OFF PASS-W set to ON 5.

  • Page 80: Performing A Calibration (Gas Cal)

    1. Confirm that the regulator knob is turned all the way clockwise. Screw the 0.25 LPM fixed flow regulator onto the calibration cylinder. 2. Install the calibration cup onto the CO-04C. Be sure the calibration cup is installed in the correct direction and that it is pushed on all the way.

  • Page 81: Sensor/Battery Replacement Date (Sen.date)

    5. Turn the regulator knob clockwise to close the regulator. 6. Unscrew the regulator from the calibration cylinder. 7. Remove the calibration cup from the CO-04C. 8. Store the calibration kit in a safe and convenient place. 9. Press and release POWER MODE to return to the GAS.TEST item in Maintenance Mode.

  • Page 82: Performing A Bump Test (Bump)

    See “Performing a Bump Test (BUMP)” on page 38 for a description of the BUMP item. Setting Alarms to Latching or Self-Resetting (LATCH) ON (factory setting): The CO-04C remains in alarm until the alarm condition passes and POWER MODE is pressed.

  • Page 83: Turning The Auto Zero Function On/Off (A.zero)

    Turning the Auto Zero Function On/Off (A.ZERO) ON: The CO-04C asks if you want to perform a fresh air adjustment at the end of the startup sequence. OFF (factory setting): The CO-04C does not ask if you want to perform a fresh air adjustment at the end of the startup sequence.

  • Page 84: User Mode Zero Suppression (Zsup.dsp)

    Maintenance Mode. It is not normally necessary to have the zero suppression item appear in User Mode. Contact RKI Instruments before turning this setting on. User Mode Zero Follower (ZFLW.DSP) ON: Zero follower item appears in User Mode.

  • Page 85: Turning The Password On/Off (Pass-W)

    Turning the Password On/Off (PASS-W) ON (factory setting): The CO-04C prompts you for a password when you enter Maintenance Mode. The factory-set password is 0400 but it can be changed. OFF: No password is required to enter Maintenance Mode. 1. While in Maintenance Mode, press AIR to scroll to PASS-W.

  • Page 86: Viewing The Rom/Sum (Rom/Sum)

    Viewing the ROM/SUM (ROM/SUM) The ROM/SUM screen shows the instrument’s firmware version and firmware checksum. 1. While in Maintenance Mode, press AIR to scroll to ROM/SUM. ROM/SUM 2. Press and release POWER MODE. The screen shows the ROM/SUM. The ROM is the top value and the SUM is the bottom value.

  • Page 87: Entering Measuring Mode (Start)

    3. Press and release POWER MODE to perform a default operation. The instrument asks if you are sure you want to perform a default operation. SURE ? YES .MODE NO .AIR 4. Press and release POWER MODE to perform a default operation. The instrument beeps twice and returns to the M.DEF item in Maintenance Mode.

  • Page 88: Appendix B: Gas Select Mode

    The CO-04C is not in operation as a gas detector while in Gas Select Mode. 1. Take the CO-04C to a non-hazardous location and turn it off if it is on. 2. Press and hold AIR, then press and hold POWER MODE. You will hear a beep after one second.

  • Page 89: Tips For Using Gas Select Mode

    7. The SAVE-AP item displays. SAVE - AP 8. Use AIR to move through the Gas Select Mode items. Tips for Using Gas Select Mode • To scroll from one item to the next, press and release AIR. To reverse the scrolling direction: a.

  • Page 90: Turning The Calibration Max Span On/Off (Max.span)

    5. See “Exiting Gas Select Mode (START)” on page 91 to enter Measuring Mode. Turning Calibration Max Span On/Off (MAX.SPAN) ON: After a passed calibration, the CO-04C displays the response reading’s maximum adjustment. A maximum span of 100 ppm indicates that the reading could have been adjusted up to 100 ppm.

  • Page 91: Stealth And Vibrator Settings (Stealth)

    Stealth and Vibrator Settings (STEALTH) STEALTH • The instrument’s backlight does not come on, regardless of the BL TIME setting. • The instrument’s LED does not come on for any reason, even alarm conditions. • The instrument’s buzzer does not sound for any reason, even alarm conditions. •...
  • Page 92 Warranty RKI Instruments, Inc. warrants the CO-04C sold by us to be free from defects in materials, workmanship, and performance for a period of three years from the date of shipment from RKI Instruments, Inc. This includes the instrument and the original sensor. Replacement parts are warranted for 1 year from the date of their shipment from RKI Instruments, Inc.

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