RKI Instruments AirLink 6940XP User manual

RKI Instruments, Inc.
www.rkiinstruments.com
AirLink 6940XP
Operator’s Manual
Part Number: 71-0584
Revision: P1
Released: 4/14/22

AirLink 6940XP Operator’s Manual • 2
WARNING
Read and understand this instruction manual before operating
detector. Improper use of the detector could result in bodily harm or
death.
Periodic calibration and maintenance of the detector is essential for
proper operation and correct readings. Please calibrate and maintain
this detector regularly! 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.

3• AirLink 6940XP Operator’s Manual
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. This warranty does not apply to those items which by their nature are
subject to deterioration or consumption in normal service, and which must be cleaned, repaired, or
replaced on a routine basis. Examples of such items are:
• Absorbent cartridges
•Fuses
• Pump diaphragms and valves
•Batteries
• Filter elements
Warranty is voided by abuse including mechanical damage, alteration, rough handling, or repair
procedures not in accordance with the operator’s manual. This warranty indicates the full extent
of our liability, and we are not responsible for removal or replacement costs, local repair costs,
transportation costs, or contingent expenses incurred without our prior approval.
THIS WARRANTY IS EXPRESSLY IN LIEU OF ANY AND ALL OTHER WARRANTIES AND
REPRESENTATIONS, EXPRESSED OR IMPLIED, AND ALL OTHER OBLIGATIONS OR LIABILITIES
ON THE PART OF RKI INSTRUMENTS, INC. INCLUDING BUT NOT LIMITED TO, THE WARRANTY
OF MERCHANTABILITY OR FITNESS FOR APARTICULAR PURPOSE. INNO EVENT SHALL RKI
INSTRUMENTS, INC. BE LIABLE FOR INDIRECT, INCIDENTAL, OR CONSEQUENTIAL LOSS OR
DAMAGE OF ANY KIND CONNECTED WITH THE USE OF ITS PRODUCTS OR FAILURE OF ITS
PRODUCTS TO FUNCTION OR OPERATE PROPERLY.
This warranty covers instruments and parts sold to users by authorized distributors, dealers, and
representatives as appointed by RKI Instruments, Inc.
We do not assume indemnification for any accident or damage caused by the operation of this gas
monitor, and our warranty is limited to the replacement of parts or our complete goods.

AirLink 6940XP Operator’s Manual • 4
Caution Statements
WARNING: EXPLOSION HAZARD - SUBSTITUTION OF COMPONENTS MAY IMPAIR
SUITABILITY FOR CLASS I, DIVISION 1, or equivalent as stated in user
manual.
AVERTISSEMENT: RISQUE D'EXPLOSION-LA SUBSTITUTION DE COMPOSANTS
PEUT RENDURE CE MATERIEL INACCEPTABLE POUR LES
EMPLACEMENTS DE CLASSE I, DIVISION I.
CAUTION: For safety reasons, this equipment must be operated and serviced by qualified
personnel only. Read and understand the instruction manual completely before
operating or servicing.
ATTENTION: POUR DES RAISONS DE SECURITE, CET ÉQUIPEMENT DOIT ETRE
UTILISE ENTRETENU ET REPARER UNIQUEMENT PAR UN PERSONNEL QUALIFIE.
ETUDIER LE MANUEL D' INSTRUCTIONS EN ENTIER AVANT D' UTILISER, D'
ENTERETENIR OU DE RÉPARER L' ÉQUIPEMENT.
CAUTION: THIS AREA MUST BE FREE OF FLAMMABLE GASES DURING CALIBRATION.
ATTENTION: CETTE ZONE DOIT ETRE EXEMPTE DE GAZ INFLAMMABLES
PENDANT L'ETALONNAGE.
CAUTION: TO PREVENT IGNITION OF EXPLOSIVE ATMOSPHERES, remove from
explosive atmosphere BEFORE SERVICING.
WARNING: A conduit seal must be used within 18 inches of the enclosure wall to comply with
the hazardous location rating of this product.
Danger Statements
DANGER: The RKI Instruments Inc. AirLink 6940XP 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.

5• AirLink 6940XP Operator’s Manual
Table of Contents
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
External Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Internal Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Exploded Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Remote-Mounted Kit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Mounting the AirLink 6940XP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Remote-Mounted Kit Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Connecting the Batteries. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Closing the Enclosure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Normal Operating Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Magnetic Buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Powering the Device. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Faults. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Above Background Display Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Accessing the Settings Menus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Global Settings and Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Global Settings Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Network ID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Unit Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Display Screen Contrast Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Return to Factory Default Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Exiting the Global Settings Menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Sensor Settings and Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
Sensor Settings Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

AirLink 6940XP Operator’s Manual • 6
Turning the Sensor On/Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Zeroing the Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Calibrating the Sensor (Manual Cal) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Calibrating the Sensor (Auto Cal) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Sensor Radio Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Sensor Alarm Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Sensor Background Setting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Calibration Method. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Sensor Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Last Zero/Cal Times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Reset Sensor Zero/Cal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Exiting the Sensor Settings Menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Replacing the Desiccant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Replacing the Batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Cleaning the 10.0 eV or 10.6 eV PID Lamp. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Replacing the PID Lamp. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Replacing the PID Electrode Stack. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Replacing the Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .74

7• Overview AirLink 6940XP Operator’s Manual
Overview
The RKI Instruments, Inc. AirLink 6940XP explosion-proof ambient air hazardous gas detector is
designed to detect up to 4 different types of toxic gases in potentially hazardous environments.
This product is UL certified as Class I, Division 1, Groups B, C, and D. The AirLink 6940XP
features non-intrusive magnetic switches that allow for complete system configuration, regular
calibration, and product maintenance to be performed in the field, without opening the enclosure
and breaking the seal of the enclosure, thereby compromising the explosion-proof rating of the
device. Non-intrusive interface with the AirLink 6940XP is made possible by use of the magnetic
tool included in the purchase of the device.
In this manual, the instructions reference the use of push-buttons, located on the front panel of the
device. In certain environments, the activation of the non-intrusive magnetic switches, through
the use of the magnetic tool, will replace the directive of the button-press actions. To apply the
magnetic tool, hold the tool to the side of the device enclosure adjacent to the push-button that
you wish to activate. When the magnetic switch is toggled, an on-screen indicator will appear on
the display screen, signifying that a connection was made.
The AirLink 6940XP continuously monitors the gas level of the surrounding environment and
reports once every minute. The reporting rate will increase to once every five seconds when the
detected gas is above the 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 6940XP to maintain a
long battery life. When the gas level passes below or above (for O2) every sensor’s set-point, the
reporting rate will return to once every minute. The AirLink 6940XP display will always show the
present concentration of gas being detected by the sensor assembly.
This document is an operation manual containing diagrams and step-by-step instructions for the
proper and safe installation, start-up, configuration, normal operation, and product maintenance
of the AirLink 6940XP.
NOTE: This document should be read in its entirety before the initial operation of the product.

AirLink 6940XP Operator’s Manual Specifications • 8
Specifications
Table 1 lists specifications for the AirLink 6940XP.
Table 1: Specifications
Target Gas Detection Range Increment Haz. Loc. Alarm Points
(1 / 2 / 3 / 4)*
Ammonia (NH3) 0-100 ppm 1 ppm Cl. 1 Div. 2 12 / 25 / 50 / 100 ppm
0-1,000 ppm 35 / 300 / 300 / 1,000 ppm
Arsine (AsH3) 0-1.00 ppm 0.01 ppm 0.2 / 0.5 / 1.0 / 1.0 ppm
Carbon Dioxide (CO2) 0-5.0% volume 0.1% volume Cl. 1 Div. 1 0.5 / 3.0 / 3.0 / 5.0 % volume
Carbon Monoxide (CO) 0-1,000 ppm 1 ppm 1,000 / 1,000 / 1,000 / 1,000
ppm
Chlorine (Cl2) 0-10.0 ppm 0.1 ppm Cl. 1 Div. 2 1 / 3 / 5 / 10 ppm
Chlorine Dioxide (ClO2) 0-1.00 ppm 0.01 ppm 0.1 / 0.3 / 0.3 / 1.0 ppm
Combustible Gas 0-100% LEL 1% LEL Cl. 1 Div. 1 10 / 20 / 50 / 100% LEL
0-100% volume 1% vol. 100 / 100 / 100 / 100%
Ethylene Oxide (EtO) 0-10.0 ppm 1.0 ppm Cl. 1 Div. 2 1 / 3 / 5 / 10 ppm
Formaldehyde (CH2O) 0-10.00 ppm 0.01 ppm 0.5 / 2 / 5 / 10 ppm
Hydrogen 0 - 100% LEL 1% LEL Cl. 1 Div. 1 10 / 20 / 50 / 100% LEL
Hydrogen Chloride (HCl) 0-20 ppm 1 ppm Cl. 1 Div. 2 5 / 10 / 10 / 20 ppm
0-100 ppm 5 / 10 / 30 / 100 ppm
Hydrogen Cyanide (HCn) 0-50 ppm Cl. 1 Div. 1 5 / 10 / 15 / 50 ppm
Hydrogen Fluoride (HF) 0-10.0 ppm 0.1 ppm Cl. 1 Div. 2 3 / 6 / 6 / 10 ppm
Hydrogen Sulfide (H2S) 0-10.0 ppm 0.1 ppm Cl. 1 Div. 1 1 / 5 / 10 / 10 ppm
0-25 ppm 1 ppm 5 / 10 / 10 / 25 ppm
0-50 ppm 5 / 10 / 10 / 50 ppm
0-100 ppm 10 / 50 / 75 / 100 ppm
0-500 ppm 100 / 200 / 200 / 500 ppm
0-2,000 ppm 100 / 200 / 200 / 2,000 ppm
Nitric Oxide (NO) 0-250 ppm Cl. 1 Div. 2 25 / 50 / 100 / 250 ppm
Nitrogen Dioxide (NO2) 0-20.0 ppm 0.1 ppm Cl. 1 Div. 2 5 / 10 / 10 / 20 ppm

9• Specifications AirLink 6940XP Operator’s Manual
Oxygen (O2) 0-25.0% volume 0.1% volume Cl. 1 Div. 1 19.5% dec. / 23.5% inc. /
17.0% dec. / 25.0% inc.
Ozone (O3) 0-5.0 ppm 0.1 ppm Cl. 1 Div. 2 1 / 3 / 5 / 5 ppm
0-100 ppm 1 ppm 10 / 15 / 15 / 100 ppm
Phosphine (PH3) 0-5.0 ppm 0.1 ppm Cl. 1 Div. 1 0.3 / 1.0 / 1.0 / 5.0 ppm
Sulfur Dioxide (SO2) 0-20 ppm 1 ppm 2 / 5 / 5 / 20 ppm
Volatile organic com-
pounds (VOCs), benzene
calibration standard
10.0 eV Lamp
0 - 10 ppm 0.01 ppm Cl. 1 Div. 1 1 / 1.5 / 1.5 / 10 ppm
0 - 20 ppm 2 / 3 / 3 / 20 ppm
0 - 50 ppm 5 / 7.5 / 7.5 / 50 ppm
0 - 100 ppm 1 ppm 10 / 15 / 15 / 100 ppm
Volatile organic com-
pounds (VOCs), isobuty-
lene calibration standard
Low Range 10.6 eV Lamp
0 - 10.00 ppm 0.01 ppm Cl. 1 Div. 1 1 / 1.5 / 1.5 / 10 ppm
0 - 20.00 ppm 2 / 3 / 3 / 20 ppm
0 - 50.00 ppm 5 / 7.5 / 7.5 / 50 ppm
High Range 10.6 eV Lamp
0 - 100 ppm 1 ppm Cl. 1 Div. 1 10 / 15 / 15 / 100 ppm
0 - 200 ppm 20 / 30 / 30 / 200 ppm
0 - 500 ppm 50 / 75 / 75 / 500 ppm
0 - 1,000 ppm 100 / 150 / 150 / 1,000 ppm
0 - 2,000 ppm 200 / 300 / 300 / 2,000 ppm
11.7 eV Lamp
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 6940XP.
Sampling Method Diffusion
Enclosure Ratings Explosion/Flame-Proof
Table 1: Specifications
Target Gas Detection Range Increment Haz. Loc. Alarm Points
(1 / 2 / 3 / 4)*

AirLink 6940XP Operator’s Manual Specifications • 10
Junction Box
Hazardous Location
Certification
ATEX: II 2 G Ex d IIB+H2 Gb;
II 2 D Ex tb IIIC Db IP66
cUL/UL: Class I Groups B, C, and D;
Class II Groups E, F, and G;
Class III
IECEx: Ex D IIB + H2 Gb
Ex tb IIIC Db IP66
Tamb -34°C to +100°C
Sensor Housing
Hazardous Location
Certification
Class I, Division 1 (or Division 2), Groups B, C, D
Ex db IIB Gb
Tamb -40°C to +60°C
NOTE: Certification only applies to some gases. Toxic
gases not certified for Div. 1 locations are suitable for
Div. 2 applications but have no third party approval.
Battery Type Lithium-thionyl (Li-SOCl2) battery pack, 3.6 VDC 76 Ah
Battery Life
6 months (45 days for versions with PID)
NOTE: When the battery indicator is blank, approximately 2 weeks of battery life remain.
Operating
Temperature Range
-40°C to +60°C (-40°F to +140°F)
Humidity Range 0 - 98% relative humidity, non-condensing
Radio Output
• 900 MHz - 52 networks, 255 sensors per network
OR
• 2.4 GHz - 78 networks, 255 sensors per network
RF Connection N-female radio frequency (RF) connector
Display
Transreflective (sunlight-readable)
160 x 104 LCD screen
LED back-light
Max Cable Length for
Remote-Mounted
Antenna
100 feet
Enclosure Material Aluminum
Sensor Housing
Material
303 Stainless steel
Max Cable Length for
Remote-Mounted
Sensor Kit
• Electrochemical (EC): 250 feet
• Infrared (IR): 40 feet
• PID: 35 feet
Dimensions 7” D x 11” W x 24” H
Weight 25 lbs.