RKI Instruments AirLink 6940NXP Operator's Manual
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RKI Instruments AirLink 6940NXP Operator's Manual

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AirLink 6940NXP
Operator's Manual
Part Number: 71-0591
Revision: P1
Released: 4/14/22
RKI Instruments, Inc.
www.rkiinstruments.com

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  • Page 1 AirLink 6940NXP Operator’s Manual Part Number: 71-0591 Revision: P1 Released: 4/14/22 RKI Instruments, Inc. www.rkiinstruments.com...
  • Page 2 Frequency of calibration depends upon the type of use you have and the sensor types. For most applications, typical calibration frequencies are between 3 and 6 months but can be more often or less often based on your usage. AirLink 6940NXP Operator’s Manual • 2...
  • Page 3 Product Warranty RKI Instruments, Inc. warrants gas alarm equipment sold by us to be free from defects in materials, workmanship, and performance for a period of one year from date of shipment from RKI Instruments, Inc. Any parts found defective within that period will be repaired or replaced, at our option, free of charge.
  • Page 4 Danger Statements DANGER: The RKI Instruments Inc. AirLink 6940NXP is an ambient air Hazardous gas sensor assembly and only monitors in the immediate vicinity of the sensor housing. A site survey is required in order to determine the best placement and quantity of sensor assemblies. Improper installation can lead to an undetectable gas leak which could result in personal injury or loss of life.

  • Page 5: Table Of Contents

    Mounting the AirLink 6940NXP ........
  • Page 6 Parts List ............69 AirLink 6940NXP Operator’s Manual • 6...

  • Page 7: Overview

    Background Gas set-point. This set-point is adjustable (per sensor) to account for sites with a constant, low-level of gas, allowing the AirLink 6940NXP to maintain a long battery life (when not operating on AC power). When the gas level passes below or above (for O ) every sensor’s set-point, the reporting rate will return to once every minute.

  • Page 8: Specifications

    Specifications Table 1 lists specifications for the AirLink 6940NXP. Table 1: Specifications Alarm Points Target Gas Detection Range Increment Haz. Loc. (1 / 2 / 3 / 4)* Ammonia (NH 0-100 ppm 1 ppm Cl. 1 Div. 2 12 / 25 / 50 / 100 ppm...
  • Page 9 0 - 100 ppm 0.01 ppm Cl. 1 Div. 1 10 / 15 / 15 / 100 ppm Alarms are only programmable at a controller and do not affect operation of the AirLink 6940NXP. Diffusion Sampling Method Enclosure Ratings • Explosion/Flame-Proof •...
  • Page 10 Weight 5 lbs. WARNING: When using the AirLink 6940NXP, you must follow the instructions and warnings in this manual to assure proper and safe operation of the AirLink 6940NXP and to minimize the risk of personal injury. Be sure to maintain and periodically calibrate the AirLink 6940NXP as described in this manual.

  • Page 11: External Description

    External Description Figure 1: AirLink 6940NXP External Component Locations Radio antenna - 900 MHz or 2.4 GHz ADD magnet switch location Mounting feet MENU magnet switch location Door latch ADD push button BACK magnet switch location MENU push button SUB magnet switch location...

  • Page 12: Internal Description

    Backup battery pack Antenna fitting connector Battery pack restraining strap Radio module Sensor connector (Up to 4) Battery pack plug Sensor connector cable (Up to 4) Antenna fitting Control board assembly AC power supply AirLink 6940NXP Operator’s Manual Internal Description • 12...

  • Page 13: Remote-Mounted Kit

    • The unit should be placed greater than 6.5 feet/2 meters away from a monitor in order to ensure reliable communications. • Select a site where the AirLink 6940NXP is not likely to be bumped or disturbed. Make sure there is sufficient room to perform start-up, maintenance, and calibration procedures.
  • Page 14 Use a maximum 1/4” diameter bolt or screw, flat washers, Grade 5 material (minimum), and corrosion protection (paint, galvanization, or zinc plating). Figure 3: AirLink 6940NXP Dimensions AirLink 6940NXP Operator’s Manual Installation • 14...
  • Page 15 3. For a remote-mounted kit, install the detector junction box at the monitoring environment using techniques appropriate for the local electrical code. 4.54 Ø 0.20 3.29 Figure 4: Remote-Mounted Kit’s Detector Junction Box Dimensions 15 • Installation AirLink 6940NXP Operator’s Manual...

  • Page 16: Remote-Mounted Kit Wiring

    Connecting AC Power It is recommended that the AirLink 6940NXP be connected to AC Power (115-220 VAC 0.35A) as its primary power source. Before using the instrument, ensure that the unit’s AC power cord is securely plugged into the power source.

  • Page 17: Connecting The Battery

    Connecting the Battery While the AirLink 6940NXP is primarily connected to AC Power, the instrument can also be powered by an internal 3.6V/76AH lithium-thionyl battery pack. This backup battery pack is already installed upon shipment but with the wiring disconnected.

  • Page 18: Start Up

    3. Verify that the controller is on and operating properly. Refer to the controller operator’s manual. 4. Press and hold ADD for approximately 6 seconds to turn the AirLink 6940NXP on. The unit enters a 1-minute startup period (3.5 minutes for LEL).
  • Page 19 Sulfur Dioxide (SO VOCs 10 minutes 7. The AirLink 6940NXP is factory-calibrated before shipping from RKI. If a full calibration is desired at startup, see page 34. NOTE: The user interface will be slow to respond until the AirLink 6940NXP establishes a connection with the controller.

  • Page 20: Operation

    (page 43). When the reading surpasses the background setting, the reading is sent back to the controller in 5-second intervals. NOTE: The user interface will be slow to respond until the AirLink 6940NXP establishes a connection with the controller.

  • Page 21: Magnetic Buttons

    Magnetic Buttons Use the provided magnet tool to actuate the AirLink 6940NXP’s buttons without having to open the enclosure door. Touch the magnet to the outer edge of the junction box in the spot indicated for the button you want to press. Tapping the junction box is the same as pressing and releasing the button.

  • Page 22: Faults

    Normal Operating Mode and the affected channel’s units reappear. For a list of the fault codes and warning symbols of the AirLink 6940NXP and their associated meanings, see page 50. Above Background Display Behavior...

  • Page 23: Accessing The Settings Menus

    Sensor housing numbers indicated in Figure 1 on page 11. NOTE: After 5 minutes of no interaction with the device, the unit will automatically return to Normal Operating Mode. 23 • Operation AirLink 6940NXP Operator’s Manual...

  • Page 24: Global Settings And Configuration

    Global Settings and Configuration The AirLink 6940NXP’s settings allow the end-user to tailor the device settings to meet their required specifications and/or site conditions. To access the instrument’s Product Settings and Configuration Menus, press and hold MENU for approximately 6 seconds.

  • Page 25: Network Id

    • There are 78 networks available with the 2.4 GHz radio. The controller and AirLink 6940NXP must have the same Network ID in order to communicate. 1. If necessary, enter the Product Settings and Configuration menu by pressing and holding MENU for 6 seconds.

  • Page 26: Unit Information

    • The radio In Range Status • The number of missed radio transmissions to the controller • The battery voltage of the AirLink 6940NXP • The date of manufacture of the sensor assembly • The serial number of the sensor assembly This screen is for informational purposes only.

  • Page 27: Display Screen Contrast Setting

    Due to varying external elements, such as extreme sunlight, the brightness of the display screen may need to be adjusted for optimum viewing. The contrast setting on the AirLink 6940NXP ranges from 0 to 255. The instrument’s factory default setting is 150, approximately 58% of the contrast scale.

  • Page 28: Return To Factory Default Settings

    Return to Factory Default Settings Returning the AirLink 6940NXP to its factory default settings will reset all customization of the device, including the zero and calibration settings of the sensor element. A factory default does not change the gas type.

  • Page 29: Exiting The Global Settings Menu

    Global Settings menu. Pressing MENU or BACK will also return the instrument to the Global Settings menu. 6. If “Yes” is selected, the screen will indicate the AirLink 6940NXP’s completion of the reset to factory default settings. Press MENU or BACK to return to the Global Settings menu.

  • Page 30: Sensor Settings And Calibration

    Sensor Settings and Calibration The AirLink 6940NXP’s sensor settings allows the four sensors to independently calibrated and adjusted. To access these menus, press and hold MENU until the Product Settings and Configuration menu screen appears on the display. Press ADD or SUB to switch between Global Settings and all four sensor setting menus.

  • Page 31: Turning The Sensor On/Off

    The AirLink 6940NXP is shipped with the sensors configured as below: • 2 Gas AirLink 6940NXP – Sensors 1 and 2 turned ON, Sensors 3 and 4 turned OFF • 3 Gas AirLink 6940NXP – Sensors 1, 2, and 3 turned ON, Sensor 4 turned OFF •...

  • Page 32: Zeroing The Sensor

    2. Press and release ADD until the Zero menu item appears. Non-O Sensor Sensor 3. Press MENU to select the menu item. 4. Press ADD to begin the zero process. AirLink 6940NXP Operator’s Manual Sensor Settings and Calibration • 32...
  • Page 33 Unscrew and remove the sensor housing cap. b. Install the calibration cup to the AirLink 6940NXP’s sensor housing base. c. Screw the regulator into the zero air calibration cylinder (100% N cylinder if zeroing a sensor).

  • Page 34: Calibrating The Sensor (Manual Cal)

    37 to calibrate the sensor element. NOTE: LEL and CO - LEL and CO versions of the AirLink 6940NXP can only be calibrated using Auto Cal (see page 37). HCl - It is recommended that the HCl version only be calibrated using Auto Cal, but Manual Cal can be used if desired.
  • Page 35 4. Press MENU to select the Calibration menu item. 5. Unscrew and remove the sensor housing cap. 6. Install the calibration cup to the AirLink 6940NXP’s sensor housing base. 7. Use the sample tubing to connect the regulator to the calibration cup.
  • Page 36 NOTE: Even if the reading does not need adjustment to match the calibration cylinder’s concentration, you must adjust it up and then back down to reset the Cal field in the Zero/Calibration Timer Information screen. AirLink 6940NXP Operator’s Manual Sensor Settings and Calibration • 36...

  • Page 37: Calibrating The Sensor (Auto Cal)

    NOTE: LEL and CO - LEL and CO versions of the AirLink 6940NXP can only be calibrated using Auto Cal (see the next section). HCl - It is recommended that the HCl version only be calibrated using Auto Cal, but Manual Cal can be used if desired.
  • Page 38 4. Press ADD to proceed to the Auto Calibration confirmation screen. To cancel calibration and return to the Sensor Settings menu, press SUB. Pressing MENU or BACK will also return the instrument to the Sensor Settings menu. AirLink 6940NXP Operator’s Manual Sensor Settings and Calibration • 38...
  • Page 39 7. Press MENU to save the gas concentration setting and advance to the calibration start screen. 8. Unscrew and remove the sensor housing cap from the assembly. 9. Install the calibration cup to the AirLink 6940NXP’s sensor housing base. 10. Use the sample tubing to connect the regulator to the calibration cup.
  • Page 40 14. Turn the regulator knob clockwise to close the regulator. 15. Press MENU or BACK to return to the Sensor Settings menu. AirLink 6940NXP Operator’s Manual Sensor Settings and Calibration • 40...

  • Page 41: Sensor Radio Address

    Sensor Radio Address The AirLink 6940NXP sensor radio addresses are adjustable from 1 to 255. Each of sensor that is turned on has its own radio address, and the address for each sensor must be set to a different value.

  • Page 42: Sensor Alarm Test

    The test can also be used to simulate emergency/safety drills onsite. NOTE: Triggering AirLink 6940NXP relays will also simulate Alarm 1 and Alarm 2 relays at the controller. Controllers cannot distinguish between real and simulated data received.

  • Page 43: Sensor Background Setting

    MENU to select the menu. 2. Press and release ADD until the Background (Background High for O versions) menu item appears. Press MENU to select the Background menu item. Non-O sensor sensor 43 • Sensor Settings and Calibration AirLink 6940NXP Operator’s Manual...
  • Page 44 Press MENU or BACK to save the setting(s) and return to the Sensor Settings menu. 5. Press MENU or BACK to save the setting and return to the Sensor Settings menu. AirLink 6940NXP Operator’s Manual Sensor Settings and Calibration • 44...

  • Page 45: Calibration Method

    2. Press and release ADD until the Cal Method menu item appears. Press MENU to select the “Cal Method” menu item. 3. Use the ADD and SUB buttons to cycle between manual calibration and auto calibration. 45 • Sensor Settings and Calibration AirLink 6940NXP Operator’s Manual...

  • Page 46: Sensor Information

    2. Press and release ADD until the “Sensor Info” menu item appears. Press MENU to select the “Sensor Info” menu item. 3. Review the information displayed. 4. Press MENU or BACK to return to the Sensor Settings menu. AirLink 6940NXP Operator’s Manual Sensor Settings and Calibration • 46...

  • Page 47: Last Zero/Cal Times

    2. Press and release ADD until the “Last Time Zero/Cal” menu item appears. Press MENU to select the “Last Time Zero/Cal” menu item. 3. Review the information displayed. 4. Press MENU or BACK to return to the Sensor Settings menu. 47 • Sensor Settings and Calibration AirLink 6940NXP Operator’s Manual...

  • Page 48: Reset Sensor Zero/Cal

    Calibration values. To return to the Sensor Settings menu without reseting the Zero and Calibration Values, press SUB. Pressing MENU or BACK also returns the instrument to the Sensor Settings menu. AirLink 6940NXP Operator’s Manual Sensor Settings and Calibration • 48...

  • Page 49: Exiting The Sensor Settings Menu

    Zero and calibration settings to their defaults. 6. Press MENU or BACK to return to the Sensor Settings menu. NOTE: If the AirLink 6940NXP’s stored Zero and Calibration values are reset, the device MUST be zeroed and calibrated again for proper and safe operation of the device.

  • Page 50: Maintenance

    The AirLink 6940NXP may be adversely affected by the exposure to certain airborne substances. Loss of sensitivity or corrosion may be gradual if such materials are present in sufficient concentrations.
  • Page 51 (if the battery pack is being used as the primary power source). System faults will activate the fault terminal on the device. ** When replacing the sensor element, the detector must be nulled and calibrated. AirLink 6940NXP Warning Symbols (for LEL Type Only) Problem Cause(s) Solution(s) The sensor is undergoing a rapid 1.

  • Page 52: Replacing The Desiccant

    Replacing the Desiccant Each AirLink 6940NXP comes with a desiccant bag installed in the junction box. The contents are blue when it is dry. As the desiccant absorbs moisture, it turns amber. Periodically check the desiccant and replace it if it has turned amber.
  • Page 53 10 minutes Carbon Dioxide Carbon Monoxide Chlorine Chlorine Dioxide Combustible Gas Ethylene Oxide Formaldehyde 10 minutes Hydrogen Chloride Hydrogen Cyanide Hydrogen Fluoride Hydrogen Sulfide Nitric Oxide Nitrogen Dioxide Oxygen Ozone Phosphine Sulfur Dioxide VOCs 53 • Maintenance AirLink 6940NXP Operator’s Manual...

  • Page 54: Cleaning The 10.0 Ev Or 10.6 Ev Pid Lamp

    13. Zero and calibrate the AirLink 6940NXP’s sensors as described on page 30. 14. Close and latch the enclosure door. Cleaning the 10.0 eV or 10.6 eV PID Lamp CAUTION: The internal components can be static sensitive. Use caution when opening the enclosure and handling internal components.
  • Page 55 PID sensor near the face. Figure 6: Using Removal Tool 7. Squeeze the removal tool to push the tabs into the sensor slots until the electrode stack and lamp are released. 55 • Maintenance AirLink 6940NXP Operator’s Manual...
  • Page 56 15. Ensure the lamp is completely dry and any visible signs of contamination are removed before reinstalling. AirLink 6940NXP Operator’s Manual Maintenance • 56...
  • Page 57 20. Plug the sensor element into the sensor housing board. Ensure that the pins on the sensing element align with the sockets on the sensor housing board. 57 • Maintenance AirLink 6940NXP Operator’s Manual...

  • Page 58: Replacing The Pid Lamp

    2. See the table below for replacement lamp part numbers based on your sensor’s part number. Table 5: PID Sensor Replacement Lamp Part Number Sensor Part Replacement Lamp Number Part Number 61-0302 51-1503 61-0303 61-0304 61-0305 51-1504 AirLink 6940NXP Operator’s Manual Maintenance • 58...
  • Page 59 Remove the spacer from the sensor and screw it back into the sensor housing cap. 3. Gently unplug the sensor element from the sensor housing board. 4. Place the PID sensor face down on a flat clean working surface. 59 • Maintenance AirLink 6940NXP Operator’s Manual...
  • Page 60 The lamp should be supported by the O-ring. 12. Continuing to hold the electrode stack between your forefinger and thumb, carefully insert the lamp into the lamp cavity in the sensor ensuring that the lamp remains in position. AirLink 6940NXP Operator’s Manual Maintenance • 60...
  • Page 61 16. Press ADD to initiate the 1-minute startup (3.5 minutes for LEL versions). 17. Wait 10 minutes and then zero and calibrate the detector as described on page 32. 61 • Maintenance AirLink 6940NXP Operator’s Manual...

  • Page 62: Replacing The Pid Electrode Stack

    DO NOT use any metal objects or tools to remove the sensor. The electrode stack can last for the life of the PID sensor if the AirLink 6940NXP is used in a very clean, controlled environment. When used in a heavily contaminated or dirty environment, the electrode stack may only last a month.
  • Page 63 8. If the spring in the lamp cavity comes out, place it back into the lamp cavity. 9. Discard the old electrode stack. 63 • Maintenance AirLink 6940NXP Operator’s Manual...
  • Page 64 14. Plug the sensor element into the sensor housing board. Ensure that the pins on the sensing element align with the sockets on the sensor housing board. AirLink 6940NXP Operator’s Manual Maintenance • 64...

  • Page 65: Replacing The Sensor

    Keep the sensor housing cap and enclosure lid tightly closed during operation. 1. Press and hold SUB for approximately 6 seconds until “OFF” shows on the display screen. 65 • Maintenance AirLink 6940NXP Operator’s Manual...
  • Page 66 NOTE: A black spacer may be attached to the sensor after you remove the sensor housing cap. Remove the spacer from the sensor and screw it back into the sensor housing cap. 3. Gently unplug the sensor element from the sensor housing board. AirLink 6940NXP Operator’s Manual Maintenance • 66...
  • Page 67 5. Screw the sensor housing cap back onto the sensor housing base, ensuring that the sensor housing cap is only tightened hand tight. 6. Press ADD to initiate the 1-minute startup (3.5 minutes for LEL versions). 67 • Maintenance AirLink 6940NXP Operator’s Manual...
  • Page 68 Nitric Oxide (NO) 12 hours Nitrogen Dioxide (NO 2 hours Oxygen (O Ozone (O Phosphine (PH Sulfur Dioxide (SO VOCs 10 minutes 8. Zero and calibrate the detector as described on page 32. AirLink 6940NXP Operator’s Manual Maintenance • 68...

  • Page 69: Parts List

    ), for up to 100 ppm full scale 66-0006L-1 Sensor, ammonia (NH ), for up to 100 ppm full scale, long life/low humidity 66-0006-2 Sensor, ammonia (NH ), for 200 to 1,000 ppm full scale 69 • Parts List AirLink 6940NXP Operator’s Manual...
  • Page 70 ), LPIR type, 5.0% volume full scale 66-0068 Sensor, arsine (AsH ), 1.00 ppm full scale 71-0591 AirLink 6940NXP Operator’s Manual (this document) 81-0002RK-01 Calibration cylinder, 50% LEL hydrogen in air, 34 liter steel 81-0002RK-03 Calibration cylinder, 50% LEL hydrogen in air, 103 liter...
  • Page 71 81-0176RK-04 Calibration cylinder, 25 ppm NH in nitrogen, 34 liter aluminum 81-0180RK-02 Calibration cylinder, 10 ppm NO in nitrogen, 58 liter 81-0180RK-04 Calibration cylinder, 10 ppm NO in nitrogen, 34 liter aluminum 71 • Parts List AirLink 6940NXP Operator’s Manual...
  • Page 72 Calibration cylinder, 5 ppm EtO in air, 34 liter aluminum 82-0003RK Electrode stack removal tool 82-0101RK Magnetic wand 82-0300RK Aluminum oxide powder PID lamp cleaning kit, with electrode stack removal tool, for 10.0 eV and 10.6 eV PID sensors’ lamps ONLY AirLink 6940NXP Operator’s Manual Parts List • 72...

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