gen2 OTIS OI-6940-NXP Series User manual

CAUTION
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.
DANGER
DANGER: OTIS INSTRUMENTS INC. OI-6940-X-X-NXP-X IS AN AMBIENT AIR TOXIC GAS
SENSOR ASSEMBLY AND ONLY MONITORS IN THE IMMEDIATE VICINITY OF THE
SENSOR HOUSINGS. 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.

TABLE OF CONTENTS
OI-6940-X-X-NXP OPS_GUIDE_REV 1.0 i
TABLE OF CONTENTS
1PRODUCT OVERVIEW..........................................................................................................................................1
1.1 INTRODUCTION ....................................................................................................................................................1
1.2 PRODUCT SPECIFICATIONS ...............................................................................................................................2
1.3 SYSTEM DIAGRAMS.............................................................................................................................................3
1.3.1 EXTERNAL SYSTEM DIAGRAM ...........................................................................................................................3
1.3.2 INTERNAL SYSTEM DIAGRAM.............................................................................................................................4
2INSTALLATION AND START-UP..........................................................................................................................5
2.1 PRODUCT PLACEMENT .......................................................................................................................................5
2.2 PRODUCT MOUNTING .........................................................................................................................................6
2.3 WIRING CONFIGURATIONS.................................................................................................................................6
2.3.1 OPENING THE ENCLOSURE................................................................................................................................6
2.3.2 CONNECTING AC POWER ...................................................................................................................................7
2.3.3 CONNECTING THE BATTERY PACK ...................................................................................................................8
2.3.4 CLOSING THE ENCLOSURE ................................................................................................................................8
2.4 SYSTEM START-UP ..............................................................................................................................................9
2.5 NORMAL OPERATING MODE.............................................................................................................................10
3PRODUCT SETTINGS AND CONFIGURATION .................................................................................................11
3.1 GLOBAL SETTINGS ............................................................................................................................................12
3.1.1 NETWORK ID.......................................................................................................................................................12
3.1.2 UNIT INFORMATION ...........................................................................................................................................13
3.1.3 DISPLAY SCREEN CONTRAST SETTING .........................................................................................................14
3.1.4 RETURN TO FACTORY DEFAULT SETTINGS ..................................................................................................15
3.1.5 BACK MENU ........................................................................................................................................................16
3.2 SENSOR SETTINGS............................................................................................................................................17
3.2.1 TURN SENSOR ON/OFF .....................................................................................................................................17
3.2.2 NULLING THE SENSOR (AUTO NULL) ..............................................................................................................18
3.2.3 CALIBRATING THE SENSOR (MANUAL CAL) ...................................................................................................20
3.2.4 CALIBRATING THE SENSOR (AUTO CAL) ........................................................................................................21
3.2.5 SENSOR RADIO ADDRESS................................................................................................................................24
3.2.6 SENSOR RELAY TEST........................................................................................................................................25
3.2.7 SENSOR BACKGROUND SETTING ...................................................................................................................26
3.2.8 SENSOR BACKGROUND HIGH SETTING .........................................................................................................27
3.2.9 SENSOR BACKGROUND LOW SETTING ..........................................................................................................28
3.2.10 CALIBRATION METHOD .....................................................................................................................................29
3.2.11 SENSOR INFORMATION ....................................................................................................................................30
3.2.12 NULL-CALIBRATION TIMER INFORMATION .....................................................................................................31
3.2.13 RESET SENSOR NULL/CAL................................................................................................................................32
3.2.14 BACK MENU ........................................................................................................................................................33
4OPERATION SETTINGS .....................................................................................................................................34
4.1 POWERING THE DEVICE ...................................................................................................................................34
4.1.1 POWERING ON ...................................................................................................................................................34
4.1.2 POWERING OFF..................................................................................................................................................34
4.2 DISPLAY BEHAVIOR ABOVE BACKGROUND ...................................................................................................35

TABLE OF CONTENTS
ii OI-6940-X-X-NXP OPS_GUIDE_REV 1.0
5PRODUCT MAINTENANCE.................................................................................................................................36
5.1 SCHEDULED MAINTENANCE.............................................................................................................................36
5.2SENSOR REPLACEMENT...................................................................................................................................37
5.3 BACKUP BATTERY REPLACEMENT..................................................................................................................38
5.4 PRODUCT FAULT CODES..................................................................................................................................39
5.5 PRODUCT REPLACEMENT PARTS AND ACCESORIES ..................................................................................40
APPENDIX A: PRODUCT WARRANTY STATEMENT.............................................................................................................42
APPENDIX B: INFORMATION ABOUT RMA SERVICE REPAIRS .........................................................................................44
APPENDIX C: INFORMATION ABOUT RMA RETURNS FOR CREDIT..................................................................................46

INSTALLATION AND START-UP
OI-6940-X-X-NXP OPS_GUIDE_REV 1.0 1
1 PRODUCT OVERVIEW
1.1 INTRODUCTION
The Otis Instruments, Inc. (Otis) GEN II Model OI-6940-X-X-NXP-X (OI-6940) Non-Explosion-Proof Ambient Air
Quad Toxic Gas Detector is designed to detect a wide range of toxic gases in many environments. The OI-6940
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 lid and breaking the seal of the enclosure. Non-
intrusive interface with the OI-6940 is made possible by use of the Otis Magnetic Tool included in the purchase of
the device.
The OI-6940 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 that may have a constant low level of gas always
present allowing the OI-6940 to maintain a long battery life (when not operating on AC power). When the gas level
drops below the set-point, for all sensors, the reporting rate will return to once every minute. The OI-6940 display
screen will always show the present concentration of gas being detected by the sensor assembly. More information
about the Background Gas Set-point is found later in this manual.
This document is an operation manual containing diagrams and step-by-step instructions for the proper and safe
installation, start-up, configuration and settings, normal operation, and product maintenance of the OI-6940.
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 Otis Magnetic Tool, will
replace the directive of the button-press actions. To apply the Otis 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.
NOTICE
This document should be read in its entirety before the initial operation of the product.
Should a question arise during the use of the product, this document will serve as a first reference for the end-user.
For inquiries beyond the information and instructions provided within this manual, contact the sales representative
of this product for assistance.

INSTALLATION AND START-UP
2 OI-6940-X-X-NXP OPS_GUIDE_REV 1.0
1.2 PRODUCT SPECIFICATIONS
System Specifications
Operating Voltage
100-240 VAC 0.35A Power Supply Input
3.3 VDC Power Supply Output
Battery Life
Up to 6 months, 45 days Max with VOC sensor installed (When used as primary power source)
Operating Temperature
Range
-40⁰C to +54⁰C
Humidity Range
0% to 98% Relative Humidity, Noncondensing
Measurement Range
Varies based on gas type
Response Time
Varies based on gas type
WireFree Option
GEN II 900 MHz –52 Networks, 255 Sensors per Network
GEN II 2.4 GHz –78 Networks, 255 Sensors per Network
RF Connection
N-Female Radio Frequency (RF) Connector
Display
Transflective (sunlight-readable)
160 X 104 LCD Screen
LED Back-Light
Interface
4 Push-Buttons (MENU, ADD, SUB, BACK)
4 Magnetic Switches for Non-Intrusive Calibration
Mechanical Specifications
Enclosure Materials
Fiberglass Device Enclosure with Clear Lid
Sensor Housing Material
Black Polypropylene Plastic with Stainless Steel Mesh Screen (Up to 4)
Product Dimensions
5" D x 10.5" W x 20" T (Max Dimensions w/ Antenna)

INSTALLATION AND START-UP
OI-6940-X-X-NXP OPS_GUIDE_REV 1.0 3
1.3 SYSTEM DIAGRAMS
Refer to the following diagrams for identification of the external and internal system components that may be referred
to in this manual.
1.3.1 EXTERNAL SYSTEM DIAGRAM
11 ADD Magnet Button Location
12 MENU Magnet Button Location
13 ADD Push Button
14 MENU Push Button
15 BACK Push Button
16 SUB Push Button
17 Front Panel Thumbscrew (2X)
18 Display Screen
19 Enclosure Lid (Clear)
20 Magnetic Tool
1Radio Antenna –900 MHz or 2.4 GHz
2Enclosure Mounting Foot (4X)
3Enclosure Latch (2X)
4BACK Magnet Button Location
5SUB Magnet Button Location
6AC Power Cord
7Sensor Housing Number 4
8Sensor Housing Number 3
9Sensor Housing Number 2
10 Sensor Housing Number 1

INSTALLATION AND START-UP
4 OI-6940-X-X-NXP OPS_GUIDE_REV 1.0
1.3.2 INTERNAL SYSTEM DIAGRAM
1Enclosure Lid (Clear)
2Front Panel
3Antenna Fitting Connector
4Radio Module –900Mhz or 2.4 GHz
5Backup Battery Pack Plug
6External Antenna Fitting
7AC Power Supply
8Terminal Board Assembly
9Backup Battery Pack
10 Battery Pack Restraining Strap
11 Sensor Housing Interface Boards –Up to 4
12 Sensor Housing Connector –Up to 4
13 Control Board Assembly