OMNI-4000 Manual
ENMET Corporation
PO Box 979
Ann Arbor, MI 48106-0979
OMNI – 4000
S/N 6705 and Above
Operation and Maintenance
Manual
80006-019
August 1999
MCN-231, 03/31/00
MCN-262, 07/15/02
MCN-283, 11/12/02
MCN-297, 04/16/03
MCN-319, 07/06/04
Table of Contents
INTRODUCTION............................................................................................................................................................. 1
Organization of the Manual .....................................................................................................................................................1
Using the Manual ................................................................................................................................................................1
To Use the Instrument Immediately .....................................................................................................................................1
Illustrations ..............................................................................................................................................................................1
Upon Receipt, Unpack.............................................................................................................................................................2
Check Order.............................................................................................................................................................................2
Serial Numbers ........................................................................................................................................................................2
1.0 GENERAL DESCRIPTION ......................................................................................................................................... 4
1.1 General Characteristics ......................................................................................................................................................4
1.2 Main Components..............................................................................................................................................................4
1.3 Operating the OMNI-4000: In the Field ............................................................................................................................4
1.4 Programming .....................................................................................................................................................................4
1.5 Gas Detection.....................................................................................................................................................................5
1.6 Sensor Readings.................................................................................................................................................................6
1.6.1 Enabled and Disabled Channels.................................................................................................................................7
1.6.2 Memorized Readings...................................................................................................................................................7
1.7 Alarms ...............................................................................................................................................................................7
1.7.1 Gas Alarms .................................................................................................................................................................8
1.7.2 Fault Alarms ...............................................................................................................................................................8
1.7.3 Acknowledging Alarms .............................................................................................................................................10
1.8 Memorization of Readings-Histograms ...........................................................................................................................10
1.9 Data Stored ......................................................................................................................................................................10
1.9.1 Memory Capacity......................................................................................................................................................10
1.9.2 Data Available ..........................................................................................................................................................11
1.9.3 Length of Data Storage.............................................................................................................................................11
1.9.4 Clearing the Stored Data ..........................................................................................................................................11
1.10 Printer or Computer Connection....................................................................................................................................11
1.11 Batteries .........................................................................................................................................................................12
1.12 Smart Block Sensor Assemblies ....................................................................................................................................13
1.13 Intrinsic Safety...............................................................................................................................................................13
2.0 OPERATION ......................................................................................................................................................... 15
2.1 Using the OMNI-4000 .....................................................................................................................................................15
2.1.1 Positioning the Instrument........................................................................................................................................15
2.1.2 Use With a Sampling Probe......................................................................................................................................15
2.1.3 Use with an Integral Sampling Pump .......................................................................................................................15
2.1.4 Use the OMNI-4000 as a Hand-Held or Stationary Beacon ...................................................................................17
2.2 Starting Up.......................................................................................................................................................................17
2.2.1 Standard Start-Up.....................................................................................................................................................18
2.2.2 Start-Up with Selection of Reference Explosive Gas or Vapor.................................................................................18
2.2.3 Selection of Reference Explosive Gas or Vapor .......................................................................................................18
2.2.4 Start-Up with Auto Set ..............................................................................................................................................19
2.2.5 Readings ...................................................................................................................................................................20
2.3 Lighting ...........................................................................................................................................................................20
2.3.1 Displaying the Instantaneous Readings ....................................................................................................................20
2.3.2 Automatic Switching to the "0-100% GAS" Range ...................................................................................................21
2.4 Display of Supplementary Data .......................................................................................................................................22
2.4.1 Date and Time...........................................................................................................................................................22
2.4.2 Battery Charge Condition.........................................................................................................................................22
2.4.3 Minimum-Maximum..................................................................................................................................................22
2.4.5 STEL and TWA..........................................................................................................................................................23
2.4.6 Returning to the Operational Mode ..........................................................................................................................23
2.5 Alarms .............................................................................................................................................................................24
2.5.1 Continuous Sound Alarm ..........................................................................................................................................24
2.5.2 Intermittent Audio Alarm ..........................................................................................................................................26
2.6 Turning the OMNI-4000 Off ...........................................................................................................................................28
2.7 Recharging the Battery ....................................................................................................................................................28
2.8 Printing the Histograms ...................................................................................................................................................30
2.9 Interference Gas Response...............................................................................................................................................33
3.0 MAINTENANCE ..................................................................................................................................................... 35
3.1 Scheduling OMNI-4000 Maintenance .............................................................................................................................35
3.2 The Maintenance Menu ...................................................................................................................................................35
3.2.1 Accessing the Maintenance Menu.............................................................................................................................35
3.2.2 Overview: Program a Sensor Menu..........................................................................................................................35
3.2.3 Overview: Calibrate a Sensor Menu.........................................................................................................................36
3.2.4 Overview: Replace the Explosive Gas Sensor Menu ................................................................................................36
3.2.5 Overview: Set Date and Time Menu .........................................................................................................................36
3.2.6 Detail: Program a Sensor Menu...............................................................................................................................36
3.3 Setting an Alarm Threshold .............................................................................................................................................40
3.3.1 For an Explosive Gas Channel .................................................................................................................................40
3.3.2 For an Oxygen Channel: ..........................................................................................................................................40
3.3.3 For a Toxic Gas Channel..........................................................................................................................................41
3.4 Detail: Calibrate a Sensor Menu ......................................................................................................................................41
3.5 Selecting the Channel for Calibration..............................................................................................................................43
3.5.1 Calibration of the Explosive Gas Channel................................................................................................................43
3.5.2 Calibration of an Oxygen Channel ...........................................................................................................................45
3.5.3 Calibration of a Toxic Gas Channel .........................................................................................................................46
3.6 Replacing the Explosive Gas Sensor ...............................................................................................................................48
3.7 Replacing the Oxygen Sensor..........................................................................................................................................53
3.8 Replacing a Toxic Gas Sensor .........................................................................................................................................54
3.9 Changing the Date and Time ...........................................................................................................................................55
3.9 Replacing the Lithium Battery.........................................................................................................................................56
4.0 APPENDIXES ........................................................................................................................................................ 57
4.1 Technical Characteristics .................................................................................................................................................57
5.0 WARRANTY...................................................................................................................................................... 60
ADDENDUM: CALIBRATION WITH PUMP MODULE ......................................................................................................... 61
ADDENDUM: CALIBRATION OF OZONE ........................................................................................................................ 61
List of Figures and Tables
Figure 1-1: Exterior Features of OMNI-4000..............................................................................................................................3
Figure 1-2: Features of the OMNI-4000 Control Panel ...............................................................................................................3
Figure 1-3: Switches for Operation and Programming ................................................................................................................3
Figure 1-3: Switches for Operation and Programming ................................................................................................................5
Figure 1-4: Location of Openings for Gas Sensors......................................................................................................................5
Figure 1-5: Channel Information Quadrants................................................................................................................................6
Figure 1-6: Example of Alternating Display................................................................................................................................7
Figure 1-7: Examples of Display with Disabled Channels ..........................................................................................................7
Figure 1-8: Alarm Light Locations ..............................................................................................................................................7
Figure 1-9: Examples of FAULT and a TWA Alarm Display.....................................................................................................8
Figure 1-10: Examples Of Fault Information. .............................................................................................................................8
Figure 1-11: ENTER Switch, Used to Acknowledge an Audio Alarm........................................................................................9
Figure 1-12: Example of a Histogram .........................................................................................................................................9
Figure 1-13. Display of the Clear Data Request Following Printout .........................................................................................11
Figure 1-14: PC Compatible Serial Printer, Used for Printing the Histograms .........................................................................11
Figure 1-15: The removable Ni-Cad Battery Pack ....................................................................................................................12
Figure 1-16: The Lithium Battery Location Inside the Instrument ............................................................................................12
Figure 1-17 Sensor locations Inside the Instrument...................................................................................................................13
Figure 2-1: OMNI-4000 On a Shoulder Strap ...........................................................................................................................14
Figure 2-2: Attachments for Remote Sampling .........................................................................................................................14
Figure 2-2: Attachments for Remote Sampling .........................................................................................................................16
Figure 2-2A: OMNI-4000 with BP-4000 Pump and Battery Pack ............................................................................................16
Figure 2-3: Position of OMNI-4000 in Stationary Beacon Mode..............................................................................................17
Figure 2-4: Location of General Alarm Light............................................................................................................................17
Figure 2-5: Start-up Display ......................................................................................................................................................18
Figure 2-6: Gas Symbols alternation with Units of Measure (% or ppm) .................................................................................18
Figure 2-7: Example of Changing Reference Gas, ....................................................................................................................19
Figure 2-8: The Quadrants of the Display, Corresponding with Four Channels of Gas Detection............................................20
Figure 2-9: Example of Alternating Display..............................................................................................................................21
Figure 2-10: The 0 – 100% GAS by volume option for the Explosive Gas Channel ................................................................21
Figure 2-11: Location of Over Range Indicator Lamp ..............................................................................................................21
Figure 2-12: Example of Date and Time Display ......................................................................................................................22
Figure 2-13: Example of the Battery Voltage Level and Warning Display ...............................................................................22
Figure 2-14: Example Minimum – Maximum Menu.................................................................................................................22
Figure 2-15: Example of Display of the STEL ..........................................................................................................................23
Figure 2-16: Location of Alarm Indicator Lights ......................................................................................................................24
Figure 2-17: Explosive Gas Alarm Features..............................................................................................................................26
Figure 2-18: Oxygen Alarm Features ........................................................................................................................................26
Figure 2-19: Toxic Gas Alarm Features ....................................................................................................................................26
Figure 2-20: Removal of Battery Pack ......................................................................................................................................29
Figure 2-21: Wiring of Connectors for Serial Printer or PC RS 232C Link ..............................................................................31
Figure 2-22: 9 Pin Sub D Receptacle, Left 25 Pin Sub D Plug, Right.......................................................................................31
Figure 2-23: Connection to a Serial Printer ...............................................................................................................................31
Figure 2-24A: Data Readout, Chart ...........................................................................................................................................32
Figure 2-24B: Data Readout, Graph ..........................................................................................................................................32
Table 2-1: Compatibility of Smart Block Sensors .....................................................................................................................33
Figure 3-1: Accessing the Maintenance Menu ..........................................................................................................................34
Figure 3-2: Diagram of Maintenance Menu Loop .....................................................................................................................34
Figure 3-3: Position of DIN Plug...............................................................................................................................................37
Figure 3-4: Table of Gases, Associated Parameters and Coefficients .......................................................................................38
Figure 3-5: Position of DIN Plug...............................................................................................................................................42
Figure 3-6: Calibration Gas Equipment Arrangement ...............................................................................................................43
Figure 3-7: Calibration of an Oxygen Cannel............................................................................................................................45
Figure 3-8: Calibration Gas Equipment Arrangement ...............................................................................................................46
Figure 3-9: Location of the Explosive Gas Sensor ....................................................................................................................48
Figure 3-10: Position of Maintenance Switch............................................................................................................................49
Figure 3-11: Location of Explosive Gas Channel Zero Potentiometer ......................................................................................50
Figure 3.12: Calibration Gas Equipment Arrangement .............................................................................................................50
Figure 3-13: Location of Explosive Gas Channel Sensitivity Potentiometer.............................................................................51
Figure 3-10: Position of Maintenance Switch............................................................................................................................52
Figure 3-14: Acceptable Locations of Oxygen and Toxic Sensors............................................................................................53
Figure 3-14: Acceptable Locations of Oxygen and Toxic Sensors............................................................................................54
Figure 3-15: Location of Lithium Battery..................................................................................................................................55
Figure 4-1: Characteristics of OMNI-4000 Sensors ..................................................................................................................57
Table 4-2: OMNI-4000 Battery Life for Configuration.............................................................................................................60
Figure A-1: Calibration with Pump Module ..............................................................................................................................61
OMNI-4000 S/N 6705 and above
ENMET Corporation
Introduction
This manual has been written to facilitate the rapid and effective use of the OMNI-4000 gas detector.
Organization of the Manual
This manual describes all the operations for which the OMNI-4000 can be used. They have been grouped in four sections:
♦
Section One:
The physical description of the instrument
♦
Section Two:
Description of the use of the OMNI-4000 in the field
♦
Section Three: Maintenance, adjustment, replacement of sensors, & calibration, etc.
♦
Section Four:
Detailed description of the technical characteristics of the OMNI-4000
Using the Manual
We recommend that the complete manual be read by the user. This manual has been written to provide information which
is essential to each phase of use.
To Use the Instrument Immediately
We recommend that the manual be read in its' entirety, prior to activation of the OMNI-4000. If so desired, to activate the
OMNI-4000 immediately, activate it in conjunction with this manual, refer to pages 4 to 8. This will enable you to become
familiar with the device and the features before actual use in the field.
CAUTION: Never start the calibration procedure unless the corresponding cylinder of gas is
available. Scrolling through the calibration menu without applying corresponding
gas will cause the installed sensor to be out of calibration and showing a Fault
condition.
If instrument is new or otherwise in proper working order, this problem can only be
corrected by performing the complete calibration procedure with proper calibration gas.
Do Not Neglect To Read The Complete Manual Before Engaging In Field Use
Of This Instrument.
Illustrations
The illustrations within this manual are intended to familiarize the user with the features of the OMNI-4000 and to provide
the user with the knowledge to operate the device in a safe environment.
NOTE: All specifications stated in this manual may change without notice.
NOTE: [important information about use of instrument – if not followed may have to redo some steps.]
CAUTION: [affects equipment – if not followed may cause damage to instrument, sensor etc…]
WARNING: [affects personnel safety – if not followed may cause bodily injury or death.]
1
ENMET Corporation
OMNI-4000 S/N 6705 and above
Upon Receipt, Unpack
Unpack the OMNI-4000 and examine it for shipping damage. If such damage is observed, notify both ENMET
customer service personnel and the commercial carrier involved immediately.
Regarding Damaged Shipments
NOTE: It is your responsibility to follow these instructions. If they are not followed, the carrier will
not honor any claims for damage.
‰
‰
‰
This shipment was carefully inspected, verified and properly packaged at our company and delivered to the
carrier in good condition.
When it was picked up by the carrier at ENMET, it legally became your company’s property.
If your shipment arrives damaged:
•
Keep the items, packing material, and carton “As Is.” Within 5 days of receipt, notify the carrier’s local
office and request immediate inspection of the carton and the contents.
•
‰
‰
After the inspection and after you have received written acknowledgment of the damage from the carrier,
contact ENMET Customer Service for return authorization and further instructions. Have your Purchase
Order and Sales Order numbers available.
ENMET either repairs or replaces damaged equipment and invoices the carrier to the extent of the liability
coverage, usually $100.00. Repair or replacement charges above that value are your company’s responsibility.
The shipping company may offer optional insurance coverage. ENMET only insures shipments with the
shipping company when asked to do so in writing by our customer. If you need your shipments insured, please
forward a written request to ENMET Customer Service.
Regarding Shortages
If there are any shortages or questions regarding this shipment, please notify ENMET Customer Service within 5 days
of receipt at the following address:
ENMET Corporation
680 Fairfield Court
Ann Arbor, MI 48108
734-761-1270 734-761-3220 Fax
Check Order
Check, the contents of the shipment against the purchase order. Verify that the OMNI-4000 is received as ordered.
Each OMNI-4000 is labeled with its target gas. If there are accessories on the order, ascertain that they are present.
Check the contents of calibration kits. Notify ENMET customer service personnel of any discrepancy immediately.
Serial Numbers
Each OMNI-4000 is serialized. These numbers are on tags on the equipment and are on record in an ENMET
database.
2
OMNI-4000 S/N 6705 and above
ENMET Corporation
Removable
Battery Pack
Sensor Opening
(one of four)
Earphone
Socket
Control Panel
See figure 1-2
RS232C
Connector
Figure 1-1: Exterior Features of OMNI-4000
Explosive Gas
Alarm Light
Over Range Indicator
Toxic or
oxygen Alarm
Lights
Toxic or Oxygen
Alarm light
General
Alarm Light
Display
On/Off switch
ENTER switch
MENU switch
BACKLIGHT switch
Figure 1-2: Features of the OMNI-4000 Control Panel
On/Off Switch
ENTER Switch
BACKLIGHT Switch
MENU Switch
Figure 1-3: Switches for Operation and Programming
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ENMET Corporation
OMNI-4000 S/N 6705 and above
1.0 General Description
OVERVIEW: In this section the OMNI-4000 and its components are described by means of a number of diagrams.
The OMNI-4000: The OMNI-4000 is a portable multi-gas detector. It can simultaneously detect the presence of up to
four gases by means of special sensors for each type of gas to be detected. Included are explosive gases (methane, propane,
butane, etc.), toxic gases (carbon monoxide, hydrogen sulfide, chlorine, etc.), and the oxygen content of the air.
1.1 General Characteristics
These are presented below. Complete specifications and sensor characteristics are presented in Section 4.
•
Simultaneous detection of up to 4 gases
•
Interchangeable factory-set sensors
•
Automatic switchover between "explosive gas %" and "volume %" scales, optional
•
Storage of events
•
Instantaneous STEL and TWA alarms
•
RS232C port for direct connection to a serial printer or compatible personal computer
•
Intrinsic Safety Approval
1.2 Main Components
These are those operated by the user. They are shown in Figures 1-1, 1-2, and 1-3. A detailed description of each main
component is given in the next chapter.
OPERATION OF THE DEVICE
The OMNI-4000 is a gas detector which can be used with up to four sensors, each one for a different type of gas. Thus,
depending on the number and type of sensors installed, the OMNI-4000 detects the presence of the corresponding gases in
the immediate environment. Sensors can be easily removed and replaced by other available sensors for different gases.
When fitted with a pump system and a calibration cover, the OMNI-4000 can be used to measure the concentrations of
gases in difficult-to-reach areas or before entry into confined spaces.
When the instrument is on and not in alarm, a confidence beep is emitted and the general alarm indicator light blinks every
30 seconds, showing that the device is operating correctly. The OMNI-4000 has received intrinsic safety approval for the
European equivalent of Class 1, Div. I, Groups A, B, C and D hazardous areas.
1.3 Operating the OMNI-4000: In the Field
Control is by means of the four touch-sensitive switches on the front panel. See Figure 1-3 in which these switches are
named. These switches are used:
•
To turn the device on and off
•
To acknowledge the gas audio alarm
•
To turn on the backlighting system for the LCD display, which automatically turns off after approximately 15 seconds
•
To select the menus during operation
1.4 Programming
Access for programming is obtained by inserting the programming plug into the appropriate socket or after opening
the instrument. The same touch sensitive switches on the OMNI-4000, shown in Figure 1-3, then enable:
•
The device to be turned on and off
•
The programming choice to be entered
•
Scrolling in a menu
•
The selection of a menu
4
OMNI-4000 S/N 6705 and above
ENMET Corporation
The names associated with the operational mode of these switches are also used for the programming mode.
The programming functions of the BACKLIGHT and MENU switches are indicated by arrows on the control
panel, which are used in certain statements on the display.
1.5 Gas Detection
The OMNI-4000 can be fitted with four of many available gas sensors. See Figure 1-4. Channel No. 1 is reserved for a
sensor for the detection of explosive gases. If an infrared CO2 smart block is used, it must be installed in Channel No. 2
Channels No. 2, 3 and 4 can be a selection of smart block sensor assemblies which are sensitive to oxygen or specific toxic
gases, such as CO, H2S, HCL, Cl2, etc. Sensor characteristics are given in Figure 4-1.
A channel can be programmed as "Enabled" or "Disabled" as desired by means of the keys on the device.
There is an option which allows the automatic changeover from the explosive gas measurement in the "0-100% LEL"
range to the "0-100% Gas" by volume range. This option can be implemented only when that the device has both an
explosive gas sensor and an oxygen sensor.
On/Off Switch
ENTER Switch
Sensor Openings
BACKLIGHT Switch
MENU Switch
Figure 1-3: Switches for Operation and
Programming
Explosive Gas Sensor
Location
Figure 1-4: Location of Openings for Gas
Sensors
5
ENMET Corporation
OMNI-4000 S/N 6705 and above
1.6 Sensor Readings
Instantaneous Readings
The gas content measured by each of the enabled sensors can be seen on the alphanumeric display. This is divided into
four independent quadrants, each corresponding to a sensor or "Channel." See Figure 1-5.
It is therefore possible to see a maximum of four readings at the same time. The amount of available useful data is greater
than the display capacity of each quadrant, so the measurements are displayed alternately as follows:
• Reading:
Sensor gas
• Reading:
Unit of measurement
Thus the operator alternately sees displayed:
• The quantity and chemical description of the gases that can be detected
• The quantity and unit of measurement of the gases that can be detected
1
2
3
4
Figure 1-5: Channel Information Quadrants
6
OMNI-4000 S/N 6705 and above
ENMET Corporation
Type of gas – unit of measurement, showing the alternation information displayed to the operator.
For example: The values for the concentration of methane gas
example: of oxygen (20.9% O2) are clearly visible.
(0% LEL CH4), of CO (10 ppm CO), of NO2 (0.0 ppm NO2).
0 CH4 10 CO
0.0 NO2
20.9 O2
Alternating with
0 LEL 10 ppm
0.0 ppm
20.9 %
Figure 1-6: Example of Alternating Display
1.6.1 Enabled and Disabled Channels
The enabled channels and those disabled, either by programming or because a sensor is not installed in a channel, are
clearly displayed, as in the following example:
The top section of Figure 1-7 shows an OMNI-4000 with an explosive gas sensor installed; the other three channels are
either disabled or without sensors. The bottom section of Figure 1-7 shows an OMNI-4000 with three toxic gas sensors
installed, and with the explosive gas channel disabled or without a sensor.
0 LEL
Disabled
Disabled
Disabled
Disabled
0.0 NO2
10 CO
0.0 SO2
Figure 1-7: Examples of Display with Disabled Channels
1.6.2 Memorized Readings
When in use the OMNI-4000 continually stores the readings. These can then be displayed later as histograms of the stored
readings. Data obtained during operations is stored when the device is turned off.
1.7 Alarms
These are both visual (indicator lamps and display) and audible alarms. See Figure 1-8.
Channel 1 Explosive Gas
Alarm Light
Channel 2
Alarm Light
Explosive Gas Over
Range Indicator Light
Channel 4
Alarm Light
Channel 3
Alarm Light
General Alarm Light
Figure 1-8: Alarm Light Locations
7
ENMET Corporation
OMNI-4000 S/N 6705 and above
1.7.1 Gas Alarms
According to the programming and the type of gas, the gas alarms can be triggered when a value is exceeded:
• Instantaneous value, on all four channels
• Both deficiency and enrichment values on an oxygen channel
• Short Term Exposure Limit (STEL), corresponding to a sliding mean over 15 minutes, for each channel with a toxic
sensor installed
• Time Weighted Average (TWA), corresponding to a sliding mean over 8 hours, for each channel with a toxic sensor
installed
As soon as at least one channel exceeds one of these preset alarm thresholds, the OMNI-4000 emits a shrill intermittent
audible signal, and the general alarm lights blinks. At the same time, the indicator lamp for the involved channel blinks and
an alarm message appears on the display (ALARM, TWA, STEL, Min, etc.), alternately with the readings in the active
quadrants.
FAULT
0.0 ppm
TWA AL
20.9
Figure 1-9: Examples of FAULT and a TWA Alarm Display
1.7.2 Fault Alarms
There are two categories of faults:
• Those concerning the sensors (Over Range, Sensor used, New calibration requested - after a major divergence
during the self-adjustment). These generate individual messages which are displayed in the appropriate
quadrant of the display, as well as visual and audible alarm signals. See Figure 1-10, top.
• Faults affecting the device itself, such as low batteries or an electronic failure. The corresponding fault message
appears on the display. It has priority over all other messages concerning the sensors. See Figure 1-10, bottom.
OUT.RNAGE
0.0 NO2
FAULT
20.9 O2
Recharge
Battery
Figure 1-10: Examples Of Fault Information.
8
OMNI-4000 S/N 6705 and above
ENMET Corporation
ENTER switch
Figure 1-11: ENTER Switch, Used to Acknowledge an Audio Alarm
Figure 1-12: Example of a Histogram
9
ENMET Corporation
OMNI-4000 S/N 6705 and above
1.7.3 Acknowledging Alarms
Acknowledging Gas Alarms
• This means canceling only the audio alarm, not the entire gas alarm. When a channel is in alarm and the ENTER
switch shown in Fig. 1-11 is pressed, the audio alarm stops, but the both the general and channel alarm lamps
continue blinking until the reading is below the programmed alarm threshold level. As soon as the reading is within
the preset limits, the alarm lamps automatically go out. This applies equally for the instantaneous alarms and the
TWA and STEL alarms.
Acknowledging Fault Alarms
• A fault alarm can be acknowledged only after the fault has been cleared from the channel.
1.8 Memorization of Readings-Histograms
The OMNI-4000 can store the readings taken for later printout or display on a computer screen, in the form of
histograms. See Figure 1-12.
The histogram function enables the printout and/or display on a personal computer or work-station of the readings and
events stored in the OMNI-4000 during the period of operation.
Clearing the memory can only be performed during the printout procedure. The OMNI-4000 can be turned off
without affecting the data stored in it.
Operating Principles
In order to make maximum use of the data printed out as charts, the principles underlying the memorization of data are
described below.
1.9 Data Stored
The OMNI-4000 stores groups of data as soon as it is switched on and then cyclically. Each of these groups has the
same structure and content:
• The average reading of concentrations for each enabled sensor over a period of one minute, at a rate of one sampling
operation per second
• The events on each channel:
] Resetting
] Faults
] Instantaneous and average alarms
] Types of maintenance requested (programming, calibration, sensor replacement)
] The date and time
] The low battery condition
] The self-adjustment request
] The maintenance function request
1.9.1 Memory Capacity
The number of readings which can be stored is limited by the size of the memory of the OMNI-4000. The recording
capacity is 48 hours, with a limit of 8 events per channel per each 24 hours.
If the quantity of data to be stored exceeds the storage capacity of the OMNI-4000, the oldest data are lost (FIFO First In, First Out - procedure). The lost data are replaced by the new data.
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OMNI-4000 S/N 6705 and above
ENMET Corporation
1.9.2 Data Available
The device computes, for each channel in use and at a rate of once per second, an average on a period of one minute.
The averaged data is stored in the memory. The following data can be read from the OMNI-4000 serial port:
• A personal computer with the COM4000 Communications software can be used to display the average readings
per minute.
• A serial printer can be used to printout the data relating to the average for each quarter of an hour. Thus, a printout shows the average reading over a period of 15 minutes; this new average is calculated by the OMNI-4000
during the printing.
1.9.3 Length of Data Storage
The data stored by the OMNI-4000 are held even if the device is left unused for a long period. The storage duration
is 3 to 5 years and is dependent on the life of the internal lithium battery.
1.9.4 Clearing the Stored Data
To clear the data, touch the ENTER switch; to retain the data, touch the BACKLIGHT switch.
This is performed by means of a request on the display after the printout of the stored data. Displayed alternately are:
To Clear
Memory
Accept:
Cancel: ¨
ENTER
Figure 1-13. Display of the Clear Data Request Following Printout
1.10 Printer or Computer Connection
These must be PC compatible and fitted with a serial RS 232C interface. See Figure 1-14. It is configured as follows:
ƒ 9600 bauds
ƒ 8 bits
ƒ Even parity
ƒ 1 Stop bit
ƒ XON/XOFF protocol
ƒ IBM Emulation
Figure 1-14: PC Compatible Serial Printer, Used for Printing the Histograms
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ENMET Corporation
OMNI-4000 S/N 6705 and above
1.11 Batteries
The OMNI-4000 is fitted with two batteries:
• One NI-CAD battery pack, rechargeable. See Figure 1-15. The operating life depends upon the use and ambient
temperature. CO2 and BRH smart blocks reduce operation life. Operating life with versions pump and smart block
combinations is given in Table 4-2, in section 4 appendix.
• A lithium battery, non-rechargeable, for the storage of the data in the OMNI-4000, in particular while the
OMNI-4000 is non-operational. The life of this battery is between 3 and 5 years. See Figure 1-16 for the
location of the lithium battery.
WARNING: Substitution of batteries or other components may compromise the intrinsic safety
of the instrument.
Lithium Battery
Figure 1-16: The Lithium Battery Location
Inside the Instrument
Removable
Battery Pack
Figure 1-15: The removable Ni-Cad
Battery Pack
12
OMNI-4000 S/N 6705 and above
ENMET Corporation
1.12 Smart Block Sensor Assemblies
These sensor assemblies for the OMNI-4000 must be handled with extreme care. Impact, excess temperatures or
penetration of water can negatively affect the readings or in extreme cases destroy the sensors. See Figure 1-17 for
sensor locations.
The toxic, CO2, BRH and oxygen smart block sensor assemblies contain electronic components. One of these
components is a memory (EEPROM) in which the manufacturer has stored the characteristics of the sensor: reading
range, sundry corrective coefficients, TWA and STEL alarms, date of manufacture, serial number, etc. Also, "rate of
wear" information enables the OMNI-4000 to automatically signal the optimum moment for the replacement of a
sensor assembly.
No calibration adjustments are necessary to enact a change of smart block sensors from one gas to another. In the
interest of safety, we recommend a test with gas to check its correct operation - it is possible that the sensor was
damaged in transit and is not sensitive enough, and this can only be assessed with a gas check.
1.13 Intrinsic Safety
The OMNI-4000 has been tested and approved for intrinsic safety, which allows it to be used in hazardous
atmospheres. Opening of the instrument enclosure in a hazardous area is not allowed. The OMNI-4000 has been
passed EEX ia llc T4.
The OMNI-4000 has also been tested and certified by the Canadian Standards Association to CSA Standard C22.2
No. 152-M1984, Combustible Gas Detection Instruments. Under this standard, the performance of the combustible
gas detection channel, only is evaluated.
CO2 Sensor
(if needed)
Toxic Gas or
Oxygen Sensor
Locations
Explosive Gas
Sensor
Figure 1-17 Sensor locations Inside the Instrument
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ENMET Corporation
OMNI-4000 S/N 6705 and above
Figure 2-1: OMNI-4000 On a Shoulder Strap
Calibration
Cover
Captive
Screw
Hose
Figure 2-2: Attachments for Remote Sampling
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OMNI-4000 S/N 6705 and above
ENMET Corporation
2.0 Operation
2.1 Using the OMNI-4000
This Chapter deals with the positioning of the OMNI-4000 for taking readings and the use of the remote sampling
system.
2.1.1 Positioning the Instrument
The operator can:
• Work while the OMNI-4000 monitors the atmosphere
• Or, take readings using a sampling system
In order to monitor the atmosphere correctly, the openings for the sensors of the OMNI-4000 must always be
unrestricted. A blocked sensor opening results in a reduced evaluation of the gas concentration, which may prove fatal
for the operator.
Carrying the OMNI-4000 with a Shoulder Strap
A shoulder strap allows the OMNI-4000 to be carried by the operator. See Figure 2-1. The device is designed so that
the sensors are facing away from the clothing. Thus, the gas exchange openings can be seen, and are unrestricted in
use, and the display can be clearly seen.
2.1.2 Use With a Sampling Probe
The OMNI-4000 can be connected to a sampling system, enabling readings to be taken in inaccessible areas or prior to
entering a confined space.
Setting-Up the Sampling System
• Position the calibration cover on the OMNI-4000 body. See Figure 2-2. Fasten it in place with the captive screw.
• Connect the vinyl hose between the cover nipple and the inlet to the squeeze pump or to the motorized sampling
pump.
• Ensure that pumping direction is correct by checking the flow of air into the sensors during pumping.
Pumping and Readings
• When using the squeeze bulb, squeeze the bulb rapidly and continuously for 2 seconds for each foot of hose
before looking at the reading.
• Wait until the readings have stabilized before confirming them. They may be over estimated (explosive gases) or
under estimated (oxygen) during pumping as a result of the movement of air.
Dismantling the Pumping System
• Always remove the calibration cover after using the probe. Failure to do so may lead to an underestimation in
the readings which may be fatal for the operator.
2.1.3 Use with an Integral Sampling Pump
The instrument may be purchased with an integral sampling pump, the BP-4000, or such a pump may be added in the
field. The pump replaces the instrument battery pack, and includes a battery pack of larger capacity, sufficient to power
both the instrument and the pump. The integral pump adds about 2 inches to the length of the instrument. Note that the
instrument battery pack and the integral pump battery pack require two different chargers. See battery life table 4-2 in
section 4.
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ENMET Corporation
OMNI-4000 S/N 6705 and above
To Replace the Instrument Battery Pack with the Integral Pump and Battery Pack
• Release the instrument battery pack captive screw. See Figure 2-2.
• Push the battery pack out with your hand. It comes out on the circuit board side, opposite the gas sensor openings.
• Push the integral pump and battery pack in from the circuit board side.
• Tighten the captive screw, securing the integral pump and battery pack into place.
Captive
Screw
Calibration
Cover
Hose
Figure 2-2: Attachments for Remote Sampling
To Use the Pump
Connect the sample tubing, or wand to the pump inlet. Use the small length of special pipe to connect the pump outlet
to the inlet of the calibration cover, which is positioned on the OMNI-4000 chassis as in Figure 2-2A. Turn on the
pump by means of the pump switch. If the flow rate decreases below a specified level, the instrument common alarm
activates and a message is displayed.
Captive
Screw
Calibration
Cover
Connecting
Pipe
Caution: The pump on/off switch does not turn off the
instrument and the instrument on/off switch does
not turn off the pump. Failure to turn off both
sections can damage the battery pack.
Pump Inlet
Pump
Module
Pump On/Off
Switch
See Caution
Integral
Battery Pack
Figure 2-2A: OMNI-4000 with BP-4000 Pump and Battery Pack
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OMNI-4000 S/N 6705 and above
ENMET Corporation
2.1.4 Use the OMNI-4000 as a Hand-Held or Stationary Beacon
The location of the instrument may be changed to detect various gases. When used as a stationary beacon, the OMNI4000 should be vertical with the battery pack acting as the base. See Figure 2-3. Depending on the type of gas to be
detected or liable to be present, the device is located:
General
Alarm Light
• At ground level for heavy gases, such as H2S
• At mid-height (approximately 1.5 meter) or at the
outlet of an air vent for the general detection of
gases and the monitoring of the oxygen and CO
• At height for the detection of light gases, such as
methane, hydrogen, or ammonia
Battery
Pack
Figure 2-3: Position of OMNI-4000 in
Stationary Beacon Mode
Although there is an audio alarm, it is essential that the operator must be able to see the general alarm indicator lamp in
a noisy environment. See Figure 2-4. There is an earphone socket on the device.
General Alarm Light
Figure 2-4: Location of General Alarm Light
2.2 Starting Up
There is a choice of three procedures when the device is turned on:
• A standard procedure, suitable for most cases
• A procedure enabling the choice of the reference explosive gas, useful when searching for a known specific
explosive gas
• A procedure known as "self-adjustment" which allows the automatic reset of the explosive gas sensor and the
toxic gas sensors to zero and the setting of the oxygen sensor to 20.9%. This procedure must be used regularly.
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ENMET Corporation
OMNI-4000 S/N 6705 and above
2.2.1 Standard Start-Up
• Press the ON/OFF switch lightly
• The device performs a series of tests for a number seconds, displaying:
Test in progress
Version:
USA 1
Figure 2-5: Start-up Display
• If the internal battery, sensor, electronics, etc. tests are successful, the readings from the sensors are displayed.
Example:
0 CH4 10 CO
0.0 NO2
20.9 O2
0 LEL 10 ppm
0.0 ppm
20.9 %
Figure 2-6: Gas Symbols alternation with Units of Measure (% or ppm)
• If the tests are incorrect, the device triggers an alarm (rapid beeping, general alarm and affected channel alarm indicator
lamps blink). Refer to the section on "Alarms.
2.2.2 Start-Up with Selection of Reference Explosive Gas or Vapor
Selection of mode
• Hold down the BACKLIGHT switch, and
• Turn on the device by pressing ON/OFF switch
• Release both switches
• The display shows:
Test in progress
Version:
USA 1
• Then:
Type of gas
Methane
2.2.3 Selection of Reference Explosive Gas or Vapor
• A different reference gas is displayed each time the MENU switch is pressed. There are twenty-seven (27) preset
reference gases, in the "0-100% LEL" range. A twenty-eighth (28) choice allows the selection of an "Other" gas
corresponding to a special need; the data for this gas must be input, as explained in Section 3. The display starts with the
gas currently selected.
• Confirming the choice: When the desired gas is displayed, press the ENTER switch. The display reads: "Test in
progress," prior to beginning the working phase. The reference explosive gas is now the selected gas.
• Aborting the procedure: Press the BACKLIGHT switch or the ON/OFF switch. The reference gas remains the same as
when the device was turned on. NOTE: If the operator does not enter any data for a period of approximately 10
seconds, the OMNI-4000 goes into test mode and normal reading mode without changing the reference gas, the same as
aborting the procedure.
• If the tests are invalid, the device triggers an alarm (rapid beeping and blinking of the alarm indicator lamp).
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OMNI-4000 S/N 6705 and above
ENMET Corporation
The device is now ready for use.
0 CH4 10 CO
0.0 NO2
20.9 O2
0 BUT 10 CO
0.0 NO2
20.9 O2
Figure 2-7: Example of Changing Reference Gas,
%LEL CH4 (top) to, %LEL Butane (bottom)
2.2.4 Start-Up with Auto Set
Selecting the Mode
• Make sure that the device is in an area where there is no explosive or toxic gas, and with a normal oxygen
concentration, such as a well-ventilated or outside area.
• Hold down the ENTER switch
• Turn the device on by pressing the ON/OFF switch
• Release both switches
The display shows:
Then:
Auto set
In progress
Tests
In progress
Wait for display
To stabilize
Prior to displaying the actual reading for each operational sensor, for instance:
0 CH4 CO
Disabled
20.9 O2
• When the readings have stabilized, press ENTER.
If the auto set procedure has been satisfactorily performed, the display shows:
Auto set:
Cancel: ¨
ENTER
• Press ENTER again, and the following is displayed momentarily:
Auto set:
Done
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ENMET Corporation
OMNI-4000 S/N 6705 and above
Auto Set Not Possible
If the ambient temperature is below 0°C or above 45°C or if the batteries are too low, the self-adjustment procedure
cannot be performed. The display shows:
Auto set
Not possible
Auto Set Performed
• With the exception of the oxygen reading set at 20.9%, the other readings are automatically set at a useful value:
0 LEL
0 ppm
0 ppm
20.9
• If the tests are negative, the device triggers an alarm, the rapid beeping and blinking of alarm indicator lamps.
Otherwise, the device is ready for use.
NOTE: The auto set procedure is not time limited, i.e. the operator must exit it, one way or the other.
2.2.5 Readings
This paragraph describes the operations performed in the gas reading mode.
2.3 Lighting
Reading in poorly lit areas is facilitated by pressing the BACKLIGHT switch. The backlighting of the display allows
the data to be seen clearly. It is automatically turned off after fifteen (15) seconds.
The backlight can be used in hazardous environments, those containing explosive gases, as the OMNI-4000 has the
required Intrinsic Safety Approval.
2.3.1 Displaying the Instantaneous Readings
In automatic operation, all instantaneous readings concerning the gases are constantly displayed.
The display is divided into four independent quadrants, each of which corresponds to a sensor or "channel."
Quadrant no. 1
1
Channel no. 1
1
2
Quadrant no. 2
Channel no. 2
2
0 LEL
Quadrant no. 3
Channel no. 3
3
Quadrant no. 4
Channel no. 4
4
0.0 ppm
3
10 ppm
20.9%
4
Figure 2-8: The Quadrants of the Display, Corresponding with Four Channels of Gas Detection
The display capacity is limited in each quadrant, therefore the readings are displayed alternately as follows:
• Reading: Sensor gas symbol
• Reading: Unit of measurement
Thus the operator sees alternately displayed:
• The quantity and chemical description of the gases that can be detected
• The quantity and unit of measurement of the gases that can be detected
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OMNI-4000 S/N 6705 and above
ENMET Corporation
0 CH4 10 CO
0.0 NO2
20.9 O2
0 LEL 10 ppm
0.0 ppm
20.9%
Figure 2-9: Example of Alternating Display
Showing the Display of usnits of Measurement and th Type of Sensors connected
2.3.2 Automatic Switching to the "0-100% GAS" Range
An option allows the automatic switching from the measurement of explosive gas in the "0-100% LEL" range to the
"0-100% GAS" by volume range whenever the reading is above 100% LEL of the selected reference gas. This reading
can only be taken with a device which has both an explosive gas sensor and an oxygen sensor installed. If the
instrument is equipped with explosive gas sensor and an oxygen sensor from the factory, the option is active.
During an actual reading the orange Over Range indictor lamp lights. See Figure 2-11. The reading is displayed
alternately as follows:
25%
0 ppm
0.0 ppm
15.6%
25 gas
0.0 NO2
0 CO
15.6 O2
Figure 2-10: The 0 – 100% GAS by volume option for the Explosive Gas Channel
The display shows, for channel no. 1, alternately the symbol "%" and then the word "GAS." The Over Range indicator
lamp lights.
Explosive Gas Over Range Indicator Lamp
Figure 2-11: Location of Over Range Indicator Lamp
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ENMET Corporation
OMNI-4000 S/N 6705 and above
2.4 Display of Supplementary Data
When the device is operating normally, the operator can access a variety of information concerning gases and a
number of internal variables of the instrument (battery voltage, date and time).
This information can be displayed by repeatedly pressing the MENU switch. The data stored in the device is then
displayed. Starting from the display of instantaneous readings,
2.4.1 Date and Time
This information is shown as "DD-MM-YY" (day-month-year) and "hr-min-sec (hours-minutes-seconds).
Date:
Time:
06/26/99
08:50 AM
Figure 2-12: Example of Date and Time Display
2.4.2 Battery Charge Condition
This is in volts (Figure 2-13, left) and by bargraph. A gradual reduction in available energy ultimately leads to the
message in Figure 2-13, right. Voltage below 6.4 V automatically disconnects the battery and the display goes off.
Please recharge
Battery
Battery: 7316v
++++++
Figure 2-13: Example of the Battery Voltage Level and Warning Display
2.4.3 Minimum-Maximum
General information concerning each channel (unit of measurement, type of gas and the min. and max. values) is then
displayed. Each time the MENU switch is pressed, the data for the next operational channel is displayed.
Sensor:
CH4 LEL:
Min 1
Max 15
MENU
Sensor:
O2 %:
Min 20.0
Max 20.9
MENU
Sensor:
CO:
Min 0
Max 8
Figure 2-14: Example Minimum – Maximum Menu
The information is displayed in turn as the MENU switch is pressed.
The Min and Max values are those encountered during the last time period that the instrument has been on. If a
channel is disabled, it is so indicated.
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OMNI-4000 S/N 6705 and above
ENMET Corporation
2.4.5 STEL and TWA
This information, programmed by the manufacturer and contained in the internal memory of the sensor and the
instrument, is available whenever at least one toxic sensor is connected and operational, and the instrument is ON:
•
•
The STEL data (Short Term Exposure Limit) for each toxic channel (STEL symbol, type of gas, reading and
unit of measurement) is displayed each time the MENU switch is pressed. Press it again to display the next
operational channel. The STEL values are only displayed after the device has been on for at least fifteen
minutes.
The TWA (Time Weighted Average) for each toxic channel (TWA symbol, type of gas, reading and unit of
measurement) is displayed each time the MENU switch is pressed. Press it again to display the next operational
channel. The TWA values are only displayed after the device has been on for at least two minutes.
STEL CO
Measure:
200 ppm
22 ppm
Figure 2-15: Example of Display of the STEL
The procedure is identical to the Min/Max procedure.
2.4.6 Returning to the Operational Mode
This occurs immediately after the last information on the STEL/TWA values on an OMNI-4000 with at least one toxic
sensor installed, or after the min.-max. values for an OMNI-4000 with no toxic sensor installed.
Return to the instantaneous readings at any time can be obtained:
• Immediately, by pressing the BACKLIGHT switch
• Automatically after a 30 second delay
NOTE: Other displays are also available with this procedure. However, they can only be accessed after connection of a
printer or computer.
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ENMET Corporation
OMNI-4000 S/N 6705 and above
2.5 Alarms
To warn the operator of a hazard, such as the presence of gas, lack of oxygen, STEL/TWA thresholds exceeded and/or
internal faults, the OMNI-4000 triggers:
• An audible alarm consisting of a rapid intermittent sound, the gas alarm, or continuous sound, the battery alarm
• A visual alarm consisting of the general alarm indicator lamp and the indicator lamp for the appropriate channel
• The display of information messages concerning the alarm
As the operator becomes aware of the alarm through the audible and visual alarm signals, the exact type of alarm is
indicated on the display.
2.5.1 Continuous Sound Alarm
Cause - This occurs when:
• The OMNI-4000 battery is low, and
• At least one reading has exceeded the maximum permissible value.
Alarms Triggered
• Continuous sound alarm,
• general alarm indicator lamp and appropriate channel indicator lamp lit.
• Display of one of the following messages:
ƒ
ƒ
ƒ
ƒ
See Figure 2-16.
"Battery low"
"> 100 LEL"
"Over range"
"New Cal."
Channel 1
Explosive Gas
Over Range
Indicator Lamp
Channel 2 Alarm
Indicator Lamp
Channel 3 Alarm
Indicator Lamp
Channel 4 Alarm
Indicator Lamp
General Alarm Indicator Lamp
Figure 2-16: Location of Alarm Indicator Lights
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OMNI-4000 S/N 6705 and above
ENMET Corporation
The action to be taken depends upon the MESSAGE displayed.
MESSAGE: Battery low
ƒ
ƒ
ƒ
MESSAGE: >100LEL
ƒ
ƒ
ƒ
ƒ
ƒ
ƒ
ƒ
Recharge the batteries
There is approximately 20 minutes of operating time left, after which the device
stops operating.
This alarm cannot be acknowledged; pressing ENTER has no effect.
Only concerns the explosive gas channel
Effect:
Latching of the display quadrant concerned
Continuous audible alarm which cannot be acknowledged
Explosive gas channel and general alarm indicator lamps are lit
Return to normal operation by turning OFF and restarting the OMNI-4000
Proceed with care in the area as there is a concentration of explosive gas above the
LEL
NOTE: This alarm occurs only when the "0-100% GAS" option has not been selected. If the OMNI-4000 is
programmed with this option, the reading goes directly to the "0-100% GAS" range; an instrument programmed with
this option must include an oxygen sensor to be operational.
MESSAGE: Over range
ƒ
ƒ
ƒ
ƒ
ƒ
Only concerns the toxic gas channels
Effect:
Continuous audible alarm which cannot be acknowledged
Toxic channel and general alarm indicator lamps are lit
Leave the area immediately as there is an excessive concentration of toxic gas
MESSAGE: New Cal
ƒ
Automatic zero reset (auto set) cannot be performed because, for instance, there is
an excessive drift from zero of a sensor
Replace the affected sensor. See Section 3.
ƒ
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ENMET Corporation
OMNI-4000 S/N 6705 and above
2.5.2 Intermittent Audio Alarm
Cause
• The alarm threshold of at least one operational channel has been exceeded.
Display
Indicator Lights
0%
0 ppm
0.0 ppm
20.9
General Alarm Indicator Lamp
ENTER Switch
Figure 2-17: Explosive Gas Alarm Features
Display
0%
0 ppm
20.9
0.0 ppm
Alarm Indicator Light
ENTER Switch
General Alarm Indicator Lamp
Figure 2-18: Oxygen Alarm Features
Display
Channel 4 Shown as an Oxygen Channel
Alarm
Indicator Light
0%
0 ppm
0.0 ppm
20.9
General Alarm Indicator Lamp
ENTER Switch
Figure 2-19: Toxic Gas Alarm Features
Channels 2 and 3 are Toxic Gas Channels
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OMNI-4000 S/N 6705 and above
ENMET Corporation
Alarms Triggered
• Intermittent audible alarm
• General alarm indicator lamp blinking
• One or more alarm indicator lamps blinking
• Display of an explanatory message in the appropriate display quadrant
• The reading of the channel in alarm is frozen at the maximum recorded value
Action
• Find out which channel or channels are in alarm by means of the channel alarm indicator lamps.
See Figures 217, 2-18, and 2-19. The corresponding quadrant alternately displays "ALARM", the reading and the type of gas.
• Refer to the paragraph below concerning the type of gas:
ƒ "LEL Alarm" paragraph for an explosive gas channel (%LEL)
ƒ "Oxygen Alarm" paragraph for an oxygen channel
ƒ "Toxic Gas Alarm" paragraph for a toxic gas channel
LEL ALARM
(Figure 2-17)
OMNI-4000 without oxygen sensor
• Be careful, explosive gas present
• Press ENTER to acknowledge the buzzer and reactivate the display
OMNI-4000 with oxygen sensor and Over Range option
• Be careful, explosive gas present
• Press ENTER to:
ƒ Attempt to acknowledge the buzzer. Acknowledgement is possible if
ƒ he reading is below 10%LEL.
ƒ And reactivate the display
OXYGEN ALARM (Figure 2-18)
The oxygen reading must be between the two thresholds for oxygen abundance and oxygen deficiency. The alarm is
triggered whenever the reading is not between the High Alarm and Low Alarm thresholds.
• Leave the area as quickly as possible. Excess and lack of oxygen are both dangerous
• Press ENTER to acknowledge the buzzer and reactivate the display
TOXIC GAS ALARM (Figure 2-19)
Three types of reading can trigger the toxic gas alarm:
• Exceeding of the maximum instantaneous permissible value
• Exceeding of the permissible TWA (Time Weighted Average)
• Exceeding of the permissible STEL (Short Term Exposure Limit)
In each of these cases, a specific message cyclically replaces the reading in the appropriate channel:
ƒ "ALARM" whenever the maximum permissible instantaneous value has been exceeded. The reading is frozen in
order that the operator can see the maximum value recorded.
ƒ "STEL AL" when the Short Term Exposure Limit has been exceeded (sliding mean of 15 minutes)
ƒ "TWA AL" when the Time Weighted Average has been exceeded (sliding mean over 8 hours)
Proceed as follows:
ƒ Leave the area as quickly as possible. High instantaneous or accumulated excesses (STEL or TWA) are equally
dangerous
ƒ Press ENTER to acknowledge the buzzer and reactivate the display
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ENMET Corporation
OMNI-4000 S/N 6705 and above
2.6 Turning the OMNI-4000 Off
To turn the OMNI-4000 off, press the ON/OFF switch for three seconds. The display shows the countdown as
follows before turning off:
Example of Display countdown:
OFF
HOLD for 3 sec 3
OFF
HOLD for 3 sec 2
OFF
HOLD for 3 sec 1
When the device is turned off, the stored values (sensor setting values, alarm thresholds, histograms, etc.) are not lost.
The data can be stored for between 3 and 5 years, depending on the life of the lithium battery.
When the device is returned from the field, the batteries may be recharged and the exposure histograms printed, as
explained below.
2.7 Recharging the Battery
The following applies to both the standard OMNI-4000 instrument and the OMNI-4000 with the
BP-4000 pump. See section 4, table 4-2 for expected battery life.
The battery can be charged either while attached to or removed from the instrument. To remove the battery pack,
release the captive screw; see figure 2-20. Push the pack out; it slides toward the circuit board side, opposite the gas
sensor openings.
Two different chargers are available. One is a standard single rate charger; the other is a dual rate charger.
To charge with the standard single rate charger:
ƒ Plug the charger into 110 VAC.
ƒ Plug the charger into the battery pack. The connectors are polarized.
ƒ The red charge indication lamp lights.
ƒ Leave the battery on charge for 12-14 hours. Never charge longer than 72 hours with the standard charger
Fully charged instruments without BRH Smart blocks should not be left idle longer than one months without recharge;
those with BRH Smart blocks should be recharged every week when not in use, when using the standard charger.
CAUTION: Failure to do so can damage the battery pack
To charge with the dual rate charger:
ƒ Plug the charger into 110 VAC.
ƒ Plug the charger into the battery pack. The connectors are polarized.
ƒ There is a pre-charge interval of from 3 - 23 minutes; the battery is trickle charged while the charger
microprocessor acquires and evaluates the battery. During this time the green charge light is on and may flash.
ƒ The battery is then charged at full rate for 5 to 6 hours
ƒ When the battery is fully charged, the green light flashes. The battery is ready for use.
ƒ Leave the battery on charge when not in use. The green light is on and flashing, indicating a periodic trickle
charge.
When an instrument battery is discharged to the low battery alarm point, discontinue use and charge the battery as
soon as possible. When the instrument is idle for a period, continuously charge the battery with the dual rate charger.
The battery is periodically trickle charged to compensate for leakage and passive use. This is particularly important
with instruments which have BRH Smartblocks aboard.
When a battery is discharged to the low battery condition or beyond, the dual rate charger microprocessor may have
difficulty acquiring the battery, and the full rate charge cycle is not initiated. In this case, the charger indicates a false
full charge, with the green light continuing to flash. After the 23 minute maximum acquisition time, disconnect the
charger from the battery for a minute and then reconnect it.
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OMNI-4000 S/N 6705 and above
ENMET Corporation
Circuitboard Side
of Enclosure
Captive
Screw
Battery
Pack
Figure 2-20: Removal of Battery Pack
WARNING: Substitution of batteries or other components may compromise the intrinsic safety
of the instrument.
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2.8 Printing the Histograms
The Histograms function enables printout or transfer to a personal computer of the values and events stored by the
OMNI-4000. This data is stored during the normal operation of the device. Clearing of the information in the memory
can be performed only during the printing procedure.
Connection to a Printer
NOTE: This must be PC compatible and fitted with an RS 232C interface configured as follows:
ƒ 9600 bauds
ƒ 8 bits
ƒ Even parity
ƒ 1 Stop bit
ƒ XON/XOFF protocol
ƒ IBM Emulation
The Connecting Cable
This can be supplied as an option. You can also make your own using Figure 2-21. The programming plug, which has
pins 2 and 4 connected, can be used as a part of the connecting cable if desired.
Connections
• Connect the DIN plug of the connecting cable, shown on the left side of Figure 2-22, to the OMNI-4000.
• Connect the 25 pin plug of the connecting cable, shown on the right side of Figure 2-22, to the serial port of the
printer.
• Check the configuration of the switches in the printer and position the switches on the front of this to "ON" and
"ON-LINE." Refer to the printer instruction manual.
Connection to a Compatible Personal Computer
This requires software known as COM4000. Refer to the manual for this software to install it on the PC. The cable is
shown schematically in Figure 2-21.
Review of the Histograms
The histograms can only be reviewed only after the OMNI-4000 has been in operation for at least:
• Fifteen minutes for printing
• One minute for display on a PC
Choice of Printing Procedure
•
•
•
Connect the cable between the OMNI-4000 and the printer or computer. See Figure 2-23
Turn the OMNI-4000 on by pressing the ON/OFF switch
Press and release the Menu Selection switch until the display alternately shows:
To print
History
•
•
Accept:
ENTER
Cancel: ¨
Pressing the ENTER switch starts the printing
Pressing any other switch returns the OMNI-4000 to the main menu without altering the data
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OMNI-4000 S/N 6705 and above
ENMET Corporation
9-Pin DCE Sub D
Receptacle
Rear View
OMNI / PC Link
OMNI DIN Plug
Rear View
25-Pin DTE Sub D Plug
Rear View
OMNI / Serial Printer
Figure 2-21: Wiring of Connectors for Serial Printer or PC RS 232C Link
Figure 2-23: Connection to a Serial Printer
Figure 2-22: 9 Pin Sub D Receptacle, Left
25 Pin Sub D Plug, Right
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ENMET Corporation
OMNI-4000 S/N 6705 and above
Review of Data
This concerns the OMNI-4000 whether connected to a serial printer or the serial port of a compatible personal
computer.
During the printing, the OMNI-4000 automatically chooses one of two displays:
• If the data storage time is less than 15 minutes, the data is presented in the form of charts, as in Figure 2-24A.
• If the data storage time is at least 16 minutes, the data is presented in the form of graphs, as in Figure 2-24B.
Figure 2-24B: Data Readout, Graph
Figure 2-24A: Data Readout, Chart
Optional Clearing of the Memory
At the end of the printing procedure, the display shows:
To clear
Memory
Accept:
ENTER
Cancel: ¨
The operator has the choice of:
• Canceling all the data still stored (clear the memory) and just reviewed, prior to putting the OMNI-4000 back
into operation. This choice is implemented by pressing the ENTER switch.
• Saving the data and putting the OMNI-4000 back into operation.
This choice is implemented by pressing the
BACKLIGHT switch.
Return to Normal Mode
This is automatic after pressing a switch, per the above procedure. Remove the printer cable.
32
OMNI-4000 S/N 6705 and above
ENMET Corporation
2.9 Interference Gas Response
Often electrochemical gas detection cells respond to gases other than those they are designed to be specific to. H2, for
example, commonly causes a response in CO cells. This response is called "interference." In the OMNI-4000,
compensating circuitry is employed to null out interference signals. On the whole, this compensating circuitry works
well, but it does work better for some combinations of cells than others. The Table 2-1 indicates what can be expected
from exposure of the instrument to possible interfering gases.
Table 2-1: Compatibility of Smart Block Sensors
Interfering Gas Concentration in ppm
Channel
O2
CO
300
CO
50
CO
25
H2S
25
H2S
10
O2
CO
H2S
SO2
NO
NO2
H2
Cl2
HCN
HCL
NH3
ETO
O3
ClO2
PH3
COCl2
BRH
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
+/–20
*
*
In PPM
/
/
/
*
/
/
/
Incom1
+/–10
*
/
/
/
+/–2
*
/
/
/
+/–2
*
/
/
/
+/–2
*
/
/
/
*
/
/
/
Incom1
*
*
*
*
*
+/–10
*
+/–10 +/–10
*
Incom1 Incom1 Incom1 Incom1 Incom1
*
*
*
*
*
/
/
Incom2 +/–1
/
/
/
/
/
/
Incom1 Incom1
+/–8 +/–3
Incom1 +/–5
SO2
25
NO
50
NO
25
NO2
10
H2
1000
CL2
10
HCN
10
HCL
30
NH3
100
*
*
*
*
*
*
*
*
*
*
/
/
/
/
/
/
/
/
/
*
*
*
*
*
*
*
+/–5 +/–5 +/–5 +/–10 Incom1 +/–6
/
+/–4
+/–3
Incom1
/
/
/
/
+/–2
+/–4 Incom1
/
/
/
+/–8
+/–2
/
/
/
/
/
/
/
Incom1
/
+/–10 +/–10
/
/
/
/
/
/
/
Incom1
/
/
+/–5
Incom1
/
/
/
/
+/–1
*
*
*
*
*
*
+/–10 +/–6 +/–6 +/–5 +/–5 +/–7 +/–4
+/–4
*
*
*
*
0
*
*
*
*
Incom1
Incom2
*
/
/
Incom1
/
Incom1
*
*
/
/
/
Incom1
*
*
/
/
/
+/–2 +/–10
+/–1 +/–5
*
/
*
*
*
/
/
/
*
*
*
/
/
/
/
ETO Ethanol
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
Incom1
*
*
*
*
*
* = Not tested
Incom1 = Incompatibility type 1: for the stated concentration, the interference is too high to produce accurate readings.
Incom2 = Incompatibility type 2: for the stated concentration, the interference is too negative to produce accurate
readings.
+/–10 = Some Interference on the indicated channel; Maximum range in ppm given
/ = Limited Interference less than 2% of the interfering gas concentration
For example: If 25 ppm SO2 is applied to a CO channel, it will cause a maximum signal
equivalent to plus or minus 5 ppm CO.
If the same gas is applied to an H2S channel, it will cause a larger interference signal.
If the same gas is applied to a NO2 channel, it will cause a maximum interference signal of 2% of 25
ppm, which is 0.5 ppm.
33
ENMET Corporation
OMNI-4000 S/N 6705 and above
DIN Plug
Maintenance Switch
Left Position: Operation
Right Position: Maintenance
Figure 3-1: Accessing the Maintenance Menu
Program
A Sensor
ENTER
Switch
Programming
Sub-Menu
ENTER
Switch
Calibration
Sub-Menu
ENTER
Switch
Change expl. gas
Sensor sub-menu
ENTER
Switch
Date and Time
Sub-menu
MENU
Switch
Calibrate
A Sensor
MENU
Switch
Replace
Comb Sensor
MENU
Switch
Set date
and time
MENU
Switch
Figure 3-2: Diagram of Maintenance Menu Loop
34
OMNI-4000 S/N 6705 and above
ENMET Corporation
3.0 Maintenance
3.1 Scheduling OMNI-4000 Maintenance
The sensor responses of an OMNI-4000 should be checked at least every thirty days, by exposing the sensors to
appropriate gases and monitoring for expected instrument response. It is recommended that all MOS block and
combustible LEL sensors of a OMNI-4000 instrument be completely recalibrated at least every ninety days, and the
Smart Block toxic sensors every six months, utilizing the procedures given in this manual. Good practice dictates
more frequent checking and calibration under particularly dangerous conditions and conditions of heavy usage. Some
instrument users check sensor responses at the beginning of every period of usage, such as every shift. National, state,
local, or company specifications may dictate minimum calibration intervals.
3.2 The Maintenance Menu
3.2.1 Accessing the Maintenance Menu
When the device is ON, the main menu can be accessed in either one of two ways:
ƒ After opening the enclosure on the circuit board side and positioning the switch towards the center of the device.
See Figure 3-1, right side.
ƒ Without opening the enclosure by inserting the special plug in the DIN socket located on the side of the enclosure.
See Figure 3-1, left side.
This description is given for the purposes of information only. It is recommended that the detailed instructions given
in the following chapters on maintenance be followed carefully. It is often safer not to open the enclosure and thus to
avoid any possibility of incorrectly handling any of the components.
When one of these two actions has been performed, the display shows "Programming a channel" to signal that the
Main Maintenance Menu has been accessed.
NOTE: Insufficient battery voltage prevents access to the main menu. The operator is warned with a "Maintenance
impossible" message. It is possible to continue by connecting the charger or by changing the battery pack.
Sub-Menus
Once the Maintenance Menu appears, the first of the four menus available is displayed: "Program a sensor." Then, the
following menus are available, by using the MENU switch.
ƒ Calibrate a sensor
ƒ Replacing the explosive gas sensor
ƒ Set Date and Time
The structure of the Maintenance Menu as a flow-chart is shown in Figure 3-2. Each time that the MENU switch is
pressed, the next item is displayed; this forms a loop. To select a menu, press the ENTER switch.
3.2.2 Overview: Program a Sensor Menu
This menu is used for:
• Selecting the channel for programming
• Enabling or disabling the selected channel
• Informing the operator of the sensor type and measurement range
• For an explosive gasth channel, selecting the reference gas from amongst the 27 preset gas types or entering the
coefficient for a 28 gas
• For an oxygen channel, programming the low and high alarm thresholds
• For toxic channels, programming the instantaneous alarm levels
35
ENMET Corporation
OMNI-4000 S/N 6705 and above
3.2.3 Overview: Calibrate a Sensor Menu
This menu is used for:
• Selecting the channel for programming
• Calibrating the zero point and sensitivity of the sensor assemblies using a calibration gas.
An oxygen sensor only
require its sensitivity to be adjusted using pure air.
CAUTION: Never start the calibration procedure unless the corresponding cylinder of gas is
available. Scrolling through the calibration menu without applying corresponding
gas will cause the installed sensor to be out of calibration and showing a Fault
condition.
If instrument is new or otherwise in proper working order, this problem can only be
corrected by performing the complete calibration procedure with proper calibration gas.
3.2.4 Overview: Replace the Explosive Gas Sensor Menu
This menu is used for:
• Selecting the channel for programming
• Calibrating the zero point and sensitivity of the explosive gas sensor using a calibration mixture (methane)
NOTE: There are no menus for the toxic and oxygen smart block sensors as these are factory set. The data for each of
these is contained in the built-in memory of the sensor.
3.2.5 Overview: Set Date and Time Menu
This menu is used to update the internal calendar and clock of the OMNI-4000. This data is used for the time scales,
specifically for the printing or down-loading of the stored readings (min, max, STEL, TWA) to an external computer.
3.2.6 Detail: Program a Sensor Menu
This menu is used for:
• Selecting the channel (sensor) for programming
• Enabling or disabling the selected channel
• Informing the Operator of the sensor type and measurement range,
• For explosive gas sensors, selecting the reference gas from amongst the 27 preset gas types or inputting the
coefficient for the 28nd gas
• For an oxygen channel, programming the low and high alarm thresholds.
• For toxic channels, programming the instantaneous alarm levels
Error Display
It is not possible to program a channel without a sensor installed. When the data is entered (erroneous entry), the
display momentarily shows the following:
Bad or absent
cell block
36
OMNI-4000 S/N 6705 and above
ENMET Corporation
Selecting the Maintenance Menu
After inserting the special plug into the DIN connector located on the side of the enclosure, as shown in Figure 3-3; the
display shows "Program a Sensor" to signal access to the main maintenance menu. Press the ENTER switch to access
the programming menu. The display shows:
Select
Sensor:
CH4
DIN Plug
Figure 3-3: Position of DIN Plug
Channel 1 is always the explosive gas channel. If CO2 smart block is used, it is installed in channel 2 only. Channels
(2, 3 and 4) can be fitted with any other oxygen or toxic gas sensor assembly:
• Press the MENU switch to increment the channels in sequence
• Press the ENTER switch to select the desired channel appears
Selecting the Channel Status
A channel can be either enabled or disabled. A channel which is enabled allows the gas readings to be taken with the
sensor installed in the channel.
NOTE: When a sensor is removed from a channel, that channel must be disabled.
Proceed as follows given that a channel is selected with the ENTER switch, as described above:
• Each time the MENU switch is pressed either "Enabled" or "Disabled" is displayed.
Press the ENTER switch to
select the status of the channel.
Choosing "Disabled" for any channel leads directly to the "Confirming Data" paragraph. Choosing "Enabled" allows
the programming to continue as described below.
37
ENMET Corporation
OMNI-4000 S/N 6705 and above
Selecting the Type of Gas for the Explosive Gas Channel, Channel 1.
Twenty-seven (27) explosive gases are preprogrammed and can be selected and displayed. See the FIGURE 3-4.
Also, a gas known as "Other" can be given a multiplier coefficient by the operator. Proceed as follows:
• After Enable is selected, the present gas is displayed
• Press the MENU switch repeatedly to view the list of 27 gases presented one-by-one on the display
• If the desired gas is not the "Other" gas, press the ENTER switch to select the gas and go to the "Setting An Alarm
Threshold for the Explosive Gas Channel".
Figure 3-4: Table of Gases, Associated Parameters and Coefficients
List of pre-programmed gases and vapors. The coefficients are given relative to methane.
Gas
Ethyl acetate
Acetone
Acetylene
Butane
1,3 – Butadiene
2 – Butanone
Dimethylether
Ethanol
Ethylene
Natural gas
Hexane
Hydrogen
Isobutane
Isopropanol
Methane
Ethylene oxide
Propylene oxide
Pentane
Propane
Propylene
Gasoline, 95 octane
Toluene
Xylene
Diesel
Methanol
Kerosene(JP4)
Octane
LEL
UEL
2.1%
2.15%
1.5%
1.5%
1.4%
1.8%
3.0%
3.3%
2.7%
5.0%
1.2%
4.0%
1.5%
2.15%
5.0%
2.6%
2.3%
1.4%
2.0%
2.0%
1.1%
1.2%
1.0%
0.6%
5.5%
0.7%
1.0%
11.5%
13%
100%
8.5%
16.3%
11.5%
27.0%
19.0%
37.0%
15.0%
7.4%
75.6%
≅ 1.5%
13.5%
15.0%
100%
?
8.0%
9.5%
11.7%
≅ 6%
7.0%
7.6%
≅ 6.0
44.0%
5.0%
6.0%
38
Vapor
Density
3.0
2.1
0.9
2.0
1.85
2.5
1.6
1.6
0.98
0.55
3.0
0.069
2.0
2.1
0.55%
1.5
2.0
2.5
1.6
1.5
3 to 4
3.1
3.7
>4
1.1
>4
3.9
Coefficient CH4
1.35
1.25
1.1
1.60
1.25
1.5
1.55
1.1
1.2
1.05
1.6
0.55
1.6
1.6
1.0
2.1
2.0
1.7
1.3
1.1
2.4
2.2
2.6
5.0
0.8
7.5
1.7
OMNI-4000 S/N 6705 and above
ENMET Corporation
• If the chosen gas is the "Other" gas, a multiplier coefficient must be entered.
If the coefficient associated with the gas
of interest is not known, contact ENMET customer service personnel. Proceed as follows:
• The displayed message reads:
Coef: Other
0.0
• Select the coefficient units to display by pressing the MENU switch.
When the desired value is reached, press
• Select the tenths of a unit by repeatedly pressing the MENU switch.
When the desired value is reached, press
BACKLIGHT switch
BACKLIGHT switch
• Select the hundredths of a unit by repeatedly pressing the MENU switch.
When the desired value is reached, press
ENTER switch
The complete coefficient is then stored. The maximum allowable values for the coefficient are between 0.50 and 9.99.
For an Oxygen Sensor.
When a channel with an oxygen sensor installed is selected, and enabled: the display reads:
Type of gas
OXYGEN
• Press ENTER switch to display:
Scale
30.0% O2
Once ENTER has been pressed, go to the "Setting an Alarm Threshold" paragraph. The memory of each smart block
sensor assembly is factory programmed with the characteristic value of the sensor. The operator cannot modify this
data. The OMNI-4000 recognizes automatically the type of sensor connected.
For a Toxic Gas Sensor
The display for an enabled channel reads, for instance:
Type of gas
CARBON MONOXIDE
• Press ENTER switch to display:
Scale
1,000 ppm CO
Once ENTER has been pressed, go to the "Setting an Alarm Threshold" paragraph. The memory of each smart block
sensor assembly is factory programmed with the characteristic values of the sensor. The operator cannot modify this
data. The OMNI-4000 automatically recognizes the type of sensor connected.
39
ENMET Corporation
OMNI-4000 S/N 6705 and above
3.3 Setting an Alarm Threshold
3.3.1 For an Explosive Gas Channel
For all explosive gases except "Methane - Range 0-5%"
• A message is displayed, for instance:
Comb. Alarm:
20LEL
CH4
To modify the alarm threshold, proceed as follows: The allowable alarm values are between 0 and 60% LEL:
• Select the tenths by repeatedly pressing the MENU switch. When the desired value is displayed, press
BACKLIGHT switch.
• Select the units by repeatedly pressing the MENU switch. When the desired value is displayed, press the ENTER
switch.
For Methane - Range 0-5% only.
• A message is displayed, for instance:
Comb. Alarm:
1.1%
CH4
To modify the alarm threshold, proceed as follows; the allowable alarm values are between 0 and 3.0% CH4:
• Select the units by repeatedly pressing the MENU switch. When the desired value is displayed, press
BACKLIGHT switch.
• Select the tenths by repeatedly pressing the MENU switch. When the desired value is displayed, press the
ENTER switch.
3.3.2 For an Oxygen Channel:
There are two alarm values to be programmed, the High Alarm and Low Alarm values:
• The maximum permissible high alarm value is the upper value on the sensor measurement scale.
• The minimum permissible low alarm value is the lower value on the sensor measurement scale. The maximum
lower alarm value is the high value of the sensor measurement scale.
Entering the High Alarm Value
The device displays, for instance:
Alarm high
23.5%
O2
• Press the ENTER switch to confirm the choice. Go to the "Confirming Data Entries" paragraph, below.
• Press MENU switch to reset the alarm value to 00.0% O2.
• Press MENU switch to modify the alarm value displayed, as follows:
ƒ Select the tens by repeatedly pressing the MENU switch. When the desired value is displayed, press
BACKLIGHT switch.
ƒ Select the units by repeatedly pressing the MENU switch. When the desired value is displayed, press
BACKLIGHT switch.
ƒ Select the tenths by repeatedly pressing the MENU switch key. When the desired value is displayed, press
ENTER switch and this leads into the data entry procedure for the low alarm value.
Entering the Low Alarm Value
The procedure is the same as for "Entering the High Alarm Value." Pressing the ENTER switch completes the
process.
40
OMNI-4000 S/N 6705 and above
ENMET Corporation
3.3.3 For a Toxic Gas Channel
There is only one alarm threshold to program. The display reads, for instance:
Alarm
0030 ppm CO
• Press the ENTER switch to confirm the choice. See the "Confirming Data Entries" paragraph.
• Press the MENU switch to reset the alarm value to 0000 ppm.
• Press the MENU switch to modify the alarm value displayed, as follows:
ƒ Select the value to the far left by repeatedly pressing the MENU switch. When the desired value is
displayed, press the BACKLIGHT switch.
ƒ Continue the procedure until the right-hand numbers are complete. When the desired value is displayed,
press the ENTER switch and this leads into the data entry confirmation procedure.
NOTE: The number of figures making up the alarm value depends upon the type of sensor. This alarm value can
therefore be situated between 1,000 ppm and 0.1 ppm, depending upon the type of sensor installed.
Confirming the Data Entries
The data has been memorized by the OMNI-4000 but not yet confirmed. This procedure enables them to be
confirmed. The display reads:
Accept:
ENTER
Cancel: ¨
• The above data which was entered is memorized when the ENTER switch is pressed, or
• The above data is lost and the data existing prior to this procedure is preserved, when any other switch than
ENTER is pressed.
• In either case, the main menu is displayed when a switch is pressed.
Return to Operator Mode
• Remove the programming plug
• The OMNI-4000 is now ready for use
3.4 Detail: Calibrate a Sensor Menu
This sub-menu is used after changing a sensor or the appearance of the "OUTSIDE RANGE" message, which signals a
significant drift in measurements. It enables:
• The selection of the channel aid program
• The automatic adjustment, without using a screwdriver, of the zero and sensitivity of the selected sensor by means
of a calibration gas cylinder. The oxygen sensor only requires adjustment of its sensitivity with pure air.
CAUTION: Never start the calibration procedure unless the corresponding cylinder of gas is
available. Scrolling through the calibration menu without applying corresponding
gas will cause the installed sensor to be out of calibration and showing a Fault
condition.
If instrument is new or otherwise in proper working order, this problem can only be
corrected by performing the complete calibration procedure with proper calibration gas.
General
It is not possible to program a channel which does not contain a sensor assembly. When the entered data (erroneous
entry) is confirmed, the display momentarily indicates:
Bad or absent
cell block
41
ENMET Corporation
OMNI-4000 S/N 6705 and above
Selecting the Maintenance Menu
With the device turned on, plug in the DIN plug. See Figure 3-5. The display reads "Program a sensor" signaling
access to the main maintenance menu.
DIN Plug
Figure 3-5: Position of DIN Plug
NOTE: Insufficient battery voltage prevents access to the main menu. The operator is warned with a "Maintenance
impossible" message. Maintenance operations can be continued either by connecting the charger or by changing the
battery pack.
Selecting the Calibration Menu
• The display reads:
Program a
sensor
• Press once the MENU switch. The display now reads:
Calibrate a
sensor
• Confirm the choice by pressing the ENTER switch. The display reads; for example:
Select
sensor:
H2S
42
OMNI-4000 S/N 6705 and above
ENMET Corporation
3.5 Selecting the Channel for Calibration
There is a channel for each sensor. Channel 1 is reserved for the explosive gas sensor. If a CO2 smart block is used, it
is installed in channel 2.
• To change the channel, press the MENU switch
• To confirm the choice and proceed with the calibration of the displayed channel, press the ENTER switch
3.5.1 Calibration of the Explosive Gas Channel
‰ The
calibration cover
vinyl hose, approximately 1 meter long
‰ A cylinder of calibration gas of known content, 20%LEL methane, for example
Preparing the OMNI-4000
‰A
• Attach the calibration cover,
• Connect the calibration gas cylinder to the injection cover with the vinyl hose; See Figure 3-6
• The channel has been selected. If not, refer to the "Selecting the Channel for Calibration" paragraph, above.
Regulator
Gas Cylinder
Calibration
cover
Figure 3-6: Calibration Gas Equipment Arrangement
43
ENMET Corporation
OMNI-4000 S/N 6705 and above
Inputting the Calibration Gas Value
This procedure defines the content of the calibration gas to be applied to the explosive gas channel sensor. The
maximum permissible content is 100% LEL.
The display reads:
Cal gas
100%LEL
CH4
To modify this value:
• Select the units by repeatedly pressing the MENU switch. When the desired value appears, press BACKLIGHT
switch.
• Select the tenths of a unit by repeatedly pressing the MENU switch. When the desired value appears, press
BACKLIGHT switch.
• Select the hundredths of a unit by repeatedly pressing the MENU switch. The units and tenths can be accessed
again by pressing the BACKLIGHT switch. When the calibration gas value is complete, press the ENTER
switch.
The value of the calibration gas to be applied is memorized.
Calibrating the Zero Point
This must be performed in an area that is free of gas contamination. The display reads, for instance:
Zero value
001 LEL
CH4
• Press the ENTER switch. The zero is set automatically by the OMNI-4000 electronics for future internal
calculations.
Calibrating the Sensitivity
The display shows the offset value obtained during the zero calibration phase, for example:
Span value
001 LEL
CH4
The value is always stated in % LEL CH4. Do not press a switch.
• Apply the calibration gas. You must be able to just hear the gas. The flow rate must be approximately 1 l/min.
• When the readings have stabilized, press the ENTER switch. The display shows:
Accept:
ENTER
Cancel: ¨
Press: • The ENTER switch to confirm the reading. The return to the initial "Calibrate a Sensor" menu is automatic
unless there is a problem (See "Problems" paragraph). It is now possible to calibrate another channel by
pressing ENTER. It should be noted that the channel has automatically been incremented. If there are not
further channels to calibrate, go to the "Return to The Operator Mode" paragraph.
• Pressing any other switch results in the return to the initial "Calibrate a Sensor" menu without memorizing the
value entered during the above calibration procedure.
44
OMNI-4000 S/N 6705 and above
ENMET Corporation
Problems
As soon as ENTER has been pressed after the sensitivity measurement, the display may show:
• "Excessive zero offset": Check the local atmosphere (gas present) and recalibrate. If the fault persists, change the
sensor.
• "Scale Exceeded": A discrepancy exists between the injected calibration gas value and that set in the "Inputting
the Calibration Gas Value." Perform the calibration procedure again. If the fault persists, change the sensor.
• "Cell used": A possible discrepancy exists between the applied calibration gas values and that set in the "Inputting the
Calibration Gas Value," or calibration was attempted without the gas. Perform the whole calibration procedure again.
If the fault persists, change the sensor.
3.5.2 Calibration of an Oxygen Channel
Equipment Required: None
Preparing the OMNI-4000
• The OMNI-4000 calibration cover must not be in place. See Figure 3-7.
• The "Oxygen" channel must be selected; if not refer to the "Selecting the Channel for Calibration" paragraph.
The Injection Cover is Not Required
Figure 3-7: Calibration of an Oxygen Cannel
Calibrating the Sensitivity
The display shows a value, for instance:
Span value:
20.6%
O2
• As soon as the reading has stabilized, press the ENTER switch. The OMNI-4000 adjusts the oxygen reading to
20.9% O2 later. The display shows:
Accept:
ENTER
Cancel: ¨
• As soon as ENTER has been pressed, the return to the initial menu ("Calibrate a Sensor") is automatic. It is now
possible to calibrate another channel by pressing ENTER. It should be noted that the channel has automatically
been incremented. If there are no further channels to calibrate, go to the "Return to The Operator Mode"
paragraph, below.
Problems
As soon as ENTER is pressed after the sensitivity measurement, the display may show "Sensor used." The sensor
should then be replaced.
45
ENMET Corporation
OMNI-4000 S/N 6705 and above
3.5.3 Calibration of a Toxic Gas Channel
Equipment Required
‰ The calibration cover
‰ A calibration adapter for the type of gas to be calibrated:
ƒ For reactive gases, 8” Teflon lined tubing, cylinder regulator and reactive gases (ex. H2S, NH3, SO2, HC1 etc…)
ƒ For non-reactive gases, Tubing and cylinder regulator
‰ A cylinder of calibration gas with a known content and corresponding to the type of sensor to be calibrated
Preparing the OMNI-4000
• Attach the OMNI-4000 calibration cover. See Figure 3-8
• Connect the calibration gas cylinder to the calibration cover with a vinyl hose
• If the channel has not been selected refer to the "Selecting the Channel for Calibration" paragraph
Use:
Cylinder Regulator 02506-004 with 17 liter cylinder
Tubing – Teflon lined
Regulator
Cylinder Regulator 02506-002 with 34 liter cylinder
(ex. H2S, NH3, HCL etc.)
Cylinder Regulator 02506-005 with 103 liter cylinder
(ex. CO2 )
Gas Cylinder
Calibration Cover
Calibration Arrangement for the Majority of Gasses
Humidifier
Humidifier
Used with BRH Sensor
Fill humidifier bowl 1/3 full with clean, tap water. The tube
should NOT go under the water line. No bubbles should be
visible when gas is flowing
Cylinder regulator part number 03700-005.
Regulator
Preset @ 0.5 lpm
Top View of Humidifier
From Regulator Î
Calibration Cover
Í To Sensor
Gas Cylinder
Note: In this application, the direction of gas flow is the
opposite of the indicator arrow on the humidifier
assembly.
Calibration Arrangement for BRH Gases
Figure 3-8: Calibration Gas Equipment Arrangement
46
OMNI-4000 S/N 6705 and above
ENMET Corporation
Inputting the Calibration Value
• This procedure defines the content of the calibration gas which will be applied into the toxic sensor. The
maximum permissible content is the maximum value of the sensor range. The display shows a message such as:
Cal gas:
0300 ppm
CO
To modify this value:
• Move to the digit to change in the number by repeatedly pressing the BACKLIGHT switch.
• Display the desired number by repeatedly pressing the MENU switch.
• Continue as above until the desired number (calibration gas value) has been obtained, then press the ENTER
switch. The value of the calibration gas to be used is memorized.
Calibrating Zero
This operation must be carried out in an environment which is free of gas contamination.
The display shows, for example:
Zero
005 ppm
CO
• Press ENTER. The value is automatically reset to zero by the OMNI-4000.
Calibrating the Sensitivity
The display shows the offset value as memorized when the zero was set. Do not press a switch.
Span Value
005 ppm
CO
• Apply the calibration gas. You must be able to just hear the gas. The flow rate must be approximately 1 l/min.
Warning: This operation is performed using a toxic gas!
• When the reading has stabilized, press ENTER. The display shows:
Accept:
ENTER
Cancel: ¨
• Press:
• ENTER to confirm the data entry and allow the return to the initial "Calibrate a Sensor" menu. It is now possible
to calibrate another channel by pressing ENTER. It should be noted that the channel number has automatically
been incremented. If there are no further channels to calibrate, go to the "Return to the Operator Mode"
paragraph.
• Pressing any other switch results in return to the initial "Calibrate a sensor" menu without memorizing the value
entered during the above calibration procedure.
Problems
As soon as ENTER has been pressed after the sensitivity calibration, the display may show:
• "Excessive zero offset": Check the local atmosphere (gas or cigarette smoke present during calibration of a CO
channel) and recalibrate. If the fault persists, change the sensor.
• "Scale Exceeded": A discrepancy exists between the content of the calibration gas and that set in the "Inputting
the Calibration Gas Value" procedure. Perform the calibration procedure again. If the fault persists, change the
sensor.
• "Sensor used": A possible discrepancy exists between the applied calibration gas value and that set during the
"Inputting the Calibration Gas Value" operation, or the calibration was attempted but gas was not used. Perform
the calibration procedure again. If the fault persists, change the sensor.
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ENMET Corporation
OMNI-4000 S/N 6705 and above
Returning to Operator Mode
• Remove the calibration cover
• Remove the programming plug
• The OMNI-4000 is now ready for use
3.6 Replacing the Explosive Gas Sensor
This sub-menu is used to configure the OMNI-4000 following the installation of a new explosive gas sensor. It also
allows the zero point and the sensitivity of the explosive gas sensor to be set by means of a calibration mixture
(methane).
CAUTION: Never start this procedure unless the corresponding cylinder of gas is available.
Equipment Required
‰ A small phillips head screwdriver
‰ A new explosive gas sensor
‰ The calibration cover
‰ A vinyl hose, approximately 1 m.
‰ A cylinder of calibration gas of known contents (for instance, or 20% LEL methane)
‰ A precision screwdriver
Preparing the OMNI-4000
• Use the screwdriver to remove both covers of the enclosure
Replacing the Explosive Gas Sensor
• Remove the old explosive gas sensor. See Figure 3-9
• Install the new explosive gas sensor. There is a groove to ensure correct positioning.
• Put the cover which protects the sensors back into place and secure it.
Explosive Gas
Sensor
Figure 3-9: Location of the Explosive Gas Sensor
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OMNI-4000 S/N 6705 and above
ENMET Corporation
Selecting the Maintenance Menu
Turn the device On and position the maintenance switch towards the center of the instrument. See Figure 3-10.
Maintenance Switch
Slide Right for Maintenance
Figure 3-10: Position of Maintenance Switch
Replacement of Explosive Gas Sensor
The display shows: "Program a Sensor" to signal access to the Main Maintenance Menu.
NOTE: Insufficient battery voltage prevents access to the main menu. The operator is warned with a "Maintenance
impossible" message. It is possible to continue by connecting the charger or by changing the battery pack.
Selecting The "Replacing an Explosive Gas Sensor" Menu
• The display shows:
Program
a sensor
• Press the MENU switch twice. The display shows:
Change
comb. sensor
• Confirm the selection by pressing ENTER. The display shows:
Calibration gas
20% LEL
CH4
Inputting the Calibration Gas Value
This procedure defines the content of the gas to be applied to the sensor during the calibration operation. The
maximum permissible concentration is 100% LEL CH4.
The display currently shows: "Calibration gas." To change the displayed value:
• Select the units by repeatedly pressing the MENU switch. When the desired number is displayed, press
BACKLIGHT switch.
• Select the tenths by repeatedly pressing MENU switch. When the desired number is displayed, press
BACKLIGHT switch.
• Select the hundredths by repeatedly pressing MENU switch. To return to the units or tenths of a unit, press
BACKLIGHT switch. When the complete number is displayed, press ENTER.
The value of the calibration gas to be applied is memorized.
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ENMET Corporation
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Setting the Zero
The display shows alternately:
Please wait for
stabilization
Then set
zero
• Press ENTER to display the zero value. The display shows, for example:
Zero
5%LEL
CH4
• Set the zero point using the zero potentiometer; see Figure 3-11. Turn the potentiometer clockwise to increase the
displayed value.
The display must show a value close to zero:
Zero
10.0%
CH4
In case of problems with the setting, replace the
sensor.
• Press ENTER when the smallest possible value
has been obtained.
Setting the Sensitivity
Preparing the Equipment:
Zero Potentiometer
• Attach the calibration cover; see Figure 3-12.
Figure 3-11: Location of Explosive Gas
Channel Zero Potentiometer
• Connect the calibration gas cylinder to the
calibration cover using the vinyl hose.
Calibration
cover
Hose
Gas Cylinder
Regulator
Figure 3.12: Calibration Gas Equipment Arrangement
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OMNI-4000 S/N 6705 and above
ENMET Corporation
Starting the Setting Procedure:
The display shows alternately:
Please wait for
stabilization
Then set
zero
• Press ENTER to display the sensitivity reading. The display shows, for example:
Sensitivity
20%LEL
CH4
• Apply the calibration gas. You must just be able to hear the gas. The flow rate must be approximately 1 l/min.
• When the reading has stabilized, adjust the value by turning the sensitivity potentiometer. See Figure 3-13. The
value is increased by turning it clockwise.
Sensitivity
Potentiometer
Figure 3-13: Location of Explosive Gas Channel Sensitivity Potentiometer
• When a value corresponding, or as near as possible, to the calibration gas value has been reached, press ENTER.
The display shows:
Accept:
ENTER
Cancel: ¨
• If no errors are detected and when ENTER is pressed, the display shows:
Program a
sensor
Problems
As soon as ENTER has been pressed after the sensitivity calibration, the display may show:
• "Zero incorrectly set": Check the local atmosphere (gas present) and recalibrate. If the fault persists, change the
sensor.
• "Sensitivity incorrectly set": A discrepancy exists between the injected calibration gas content and that set in the
"Inputting the Calibration Gas Value" procedure. Restart the calibration procedure. If the fault persists, change
the sensor.
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ENMET Corporation
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Returning to Operator Mode
• Slide the maintenance switch to the left; refer to Figure 3-10
• Replace the circuit board cover
• Remove the calibration cover
Maintenance Switch
Slide Right for Maintenance
Figure 3-10: Position of Maintenance Switch
Replacement of Explosive Gas Sensor
The OMNI-4000 is now ready for use
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OMNI-4000 S/N 6705 and above
ENMET Corporation
3.7 Replacing the Oxygen Sensor
This procedure is used when a new oxygen sensor is installed.
Equipment Required
‰ A small phillips head screwdriver
‰ A new oxygen sensor
Replacing the Oxygen Sensor
• Use the screwdriver to remove the cover which contains the sensor openings. See Figure 3-14
• Remove the old oxygen sensor
• Install the new sensor. The connector ensures a correct fitting. Be careful not to damage the male part of the
connector.
• Put the cover protecting the sensors back into place
CO2 Sensor
(if needed)
Toxic Gas or
Oxygen Sensor
Locations
Explosive Gas
Sensor
Figure 3-14: Acceptable Locations of Oxygen and Toxic Sensors
Possible locations of the oxygen sensor are channels 2, 3, and 4. See Figure 3-14.
Checking the Oxygen Sensor
In the interests of safety, check the sensor by:
• Pressing the ON/OFF switch
• Checking that the displayed reading is 20.9%, in a normally ventilated environment. If it is not, attempt on autozero or calibration. If this doesn't work, replace the sensor.
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ENMET Corporation
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3.8 Replacing a Toxic Gas Sensor
This procedure is used for the installation of a new toxic gas sensor.
Equipment Required
‰ A small phillips head screwdriver
‰ A new toxic gas sensor
Replacing the Toxic Gas Sensor
• Use the screwdriver to remove the cover which contains the sensor openings
• Remove the old toxic gas sensor
• Install the new toxic gas sensor. The connector ensures a correct fitting. Be careful not to damage the male part
of the connector.
• Put the cover protecting the sensors back into place
Possible locations of toxic sensors are channels 2, 3, and 4. See Figure 3-14.
CO2 Sensor
(if needed)
Toxic Gas or
Oxygen Sensor
Locations
Explosive Gas
Sensor
Figure 3-14: Acceptable Locations of Oxygen and Toxic Sensors
Checking the Toxic Gas Sensor
In the interests of safety, check the toxic gas sensor by applying a calibration gas of known contents. To do this:
• Turn the OMNI-4000 on by pressing the ON/OFF switch
• Using the calibration cover, apply the gas as during a calibration
• Check that the concentration of the calibration gas from the cylinder corresponds to the display for the appropriate
channel
• Remove the gas and the calibration cover
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OMNI-4000 S/N 6705 and above
ENMET Corporation
3.9 Changing the Date and Time
This sub-program is used to update the OMNI-4000 internal calendar and clock. This data is used to define the time
scales for the printing and down-loading to a computer of stored data.
Selecting the Maintenance Menu
Turn the instrument ON, and insert the programming plug into the DIN connector located on the side of the unit. See
Figure 3-15.
Lithium Battery
Figure 3-15: Location of Lithium Battery
N.B.: Insufficient battery voltage prevents access to the main menu. The operator is warned with a "Maintenance
Impossible" message. It is possible to continue by connecting the charger or by changing the battery pack.
Selecting the "Setting Time and Date" Menu
• The display shows:
Program a
sensor
• Press the MENU switch three times. The display shows:
Set Date
and time
• Confirm the selection by pressing ENTER
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ENMET Corporation
OMNI-4000 S/N 6705 and above
Changing the Date
The display reads, for instance:
Date
06:10:99
• Move to the desired position in the date by pressing the BACKLIGHT switch.
• Display the desired value by repeatedly pressing the MENU switch
• Repeat these steps until the date is correct and then press ENTER
Changing the Time
The time is not incremented during the display. The display shows, from left to right, hours, minutes and seconds, e.g.:
Time
PM 04:23:03
• Move to the desired time in hours by repeatedly pressing the BACKLIGHT switch
• Display the desired value by repeatedly pressing the MENU switch
• Repeat these steps until the time is correct, and then press ENTER
Confirming the Date and Time
The following message is displayed:
Accept:
ENTER
Cancel: ¨
• Press:
• ENTER to confirm and memorize the data, and to return to the Main Menu
• Any other switch: the data entered during the above operation is lost and the initial values remain. The display
returns to the Main Menu.
Returning to the Operator Menu
• Remove the programming plug
• The OMNI-4000 is now ready for use
3.9 Replacing the Lithium Battery
When the OMNI-4000 is turned off, the electronic circuits for the date and time are powered by an independent
lithium battery with a life expectancy of 3 to 5 years. The battery must be replaced at the end of this period, or when a
drift in time or difficulty in memorizing the date is observed. Proceed as follows:
• Remove the battery pack
• Remove the cover protecting the sensors and remove the sensors
• Remove the second cover over the circuit board
• Remove the flat connector (keyboard-printer circuit board link)
• Remove the screws securing the circuit board
• Carefully remove the circuit board vertically. The lithium battery can now be seen. See Figure 3-15
• Remove the old and insert the new lithium battery: the connections are soldered. Do not attempt to recharge the
lithium battery.
• Replace the circuit board, the securing screws, the connector, the sensors, the two covers and put the battery pack
back in place.
• Reset the date and time as described in the preceding section
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OMNI-4000 S/N 6705 and above
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4.0 Appendixes
4.1 Technical Characteristics
NOTE: All specifications stated in this manual may change without notice.
Model:
OMNI-4000
Configuration:
One hot wire explosive gas sensor
One to three other electrochemical, semi-conductor(BRH) or infra-red(CO2) sensors
Gases Detected:
See table of characteristics of sensors
Figure 4-1: Characteristics of OMNI-4000 Sensors
Expl
O2
O3
CL2 CLO2 CO
Standard range 100% 30.0% 1.00 10.00 3.00
BRH
H2
H2S HCL HCN NH3
NO
NO2 ETO SO2
HF
1000
500
2000
100
30.0
10.0
100
300
30.0
30.0
30.0
10.0
AsH3 SiH4 CO2
1.00
50
5%
(1)
LEL
Response time
(5)
< 20
< 20
< 60
< 60
< 60
< 30
< 60
< 70
< 60
< 90
< 60
< 60
< 30
< 30
< 70
< 25 < 120 < 120 < 120 < 30
Temperature
range (6)
-30
+75
-10
+40
-10
+40
-10
+40
-10
+40
-10
+40
-10
+50
-10
+40
-10
+40
-10
+40
-10
+40
-10
+40
-10
+40
-10
+40
-10
+40
-10
+40
-10
+40
-10
+40
-10
+40
-10
+40
Sensor life (7)
24
18
18
30
18
30
30
30
30
18
18
10
30
30
24
30
18
24
24
30
Guaranteed (8)
12
12
12
12
12
12
12
12
12
12
12
6
12
12
12
12
12
12
12
12
(1) In ppm except for flammable gasses, oxygen and CO2.
(5) In seconds to 90% of final value.
(6) In °C
(7) Average life in months.
(8) In months.
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ENMET Corporation
Measurements:
OMNI-4000 S/N 6705 and above
Continuous for all operational sensors
Sensors; Electrochemical:
Interchangeable preset units
Automatic recognition by device (EEPROM)
Display:
Alphanumeric LCD, 2 lines of 16 characters
Plain messages
Display Backlight:
Timed
Optional Switchover of Explosive Gas Detection Ranges:
Automatic for "% Gas" scale to "% Volume" scale; must have an oxygen sensor installed
Sensor Failure
Identification by individual indicator lamps
Plain language messages
Corresponding display "frozen." Other channels operational
Continuous audio and general visual alarm
NI-CAD Battery Failure
Plain language display
Continuous audio and general visual alarm
Operational Checks
Automatic calibration on request (optional)
Self-test on start-up
Audio and visual signals every 30 seconds
Readings displayed plainly
Alarms
Explosive Gas: One instantaneous threshold adjustable over the 0-50% LEL range.
Oxygen: Two instantaneous thresholds adjustable over the full measurement scale of the
sensor (oxygen depletion and abundance)
Toxic (per sensor):
ƒ One instantaneous alarm threshold adjustable over the full measurement scale
ƒ One TWA threshold
ƒ One STEL threshold
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OMNI-4000 S/N 6705 and above
ENMET Corporation
Alarm Information
General audio and visual alarm (display, indicator lamp)
Individual channel alarms (alarm or fault)
Explosive Gas range switchover indicator (% Gas - % Volume)
Plain language display on fault or alarm per channel
Outputs
Optional
OMNI-4000 /serial printer connector. Optional interface for parallel printer
OMNI-4000 /PC compatible link
Associated Software
Maintenance and monitoring software for LOTUS, EXCEL, etc. data bases
Power Supply
NI-CAD battery pack, replaceable in hazardous atmosphere
Lithium battery for data storage
Recharging Time
NI-CAD battery pack only:
12-14 hours with standard charger.
5 -6 hours with dual rate charger.
Tightness:
IP 64
Weight:
Approximately 1 kg
Dimensions:
194 x 119 x 58 mm
Approval:
EEX ia IIC T4
CSA 22.2 152-M1984
Accessories:
110 Vac, 220 VAC, or 12 VDC standard charger
110 VAC dual rate charger
Earphones for noisy environments
Automatic sampling pump
Manual sampling pump
Aspirators with and without probe
Calibration kits
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ENMET Corporation
OMNI-4000 S/N 6705 and above
Table 4-2: OMNI-4000 Battery Life for Configuration
OMNI-4000 Configuration
Battery Life in Hours
Combustible sensor + CO2 + Other toxic sensors
12
Combustible sensor + toxic sensors
45
Combustible sensor + CO2 + BRH + other toxic sensors
8
Combustible sensor + BRH + toxic sensors
16
Combustible sensor + CO2 + other toxic sensors + BP21(pump)
8
Combustible sensor + toxic sensors + BP21(pump)
12
Combustible sensor + CO2 + BRH + toxic sensors + BP21(pump)
6
Combustible sensor + BRH + toxic sensors + BP21(pump)
9
5.0 WARRANTY
ENMET warrants new instruments to be free from defects in workmanship and material under normal use for a period
of one year from date of shipment from ENMET. The warranty covers both parts and labor excluding instrument
calibration and expendable parts such as calibration gas, filters, batteries, etc... Equipment believed to be defective
should be returned to ENMET within the warranty period (transportation prepaid) for inspection. If the evaluation by
ENMET confirms that the product is defective, it will be repaired or replaced at no charge, within the stated
limitations, and returned prepaid to any location in the United States by the most economical means, e.g. Surface
UPS/RPS. If an expedient means of transportation is requested during the warranty period, the customer is responsible
for the difference between the most economical means and the expedient mode. ENMET shall not be liable for any
loss or damage caused by the improper use of the product. The purchaser indemnifies and saves harmless the
company with respect to any loss or damages that may arise through the use by the purchaser or others of this
equipment.
This warranty is expressly given in lieu of all other warranties, either expressed or implied, including that of
merchantability, and all other obligations or liabilities of ENMET, which may arise in connection with this equipment.
ENMET neither assumes nor authorizes any representative or other person to assume for it any obligation or liability
other than that, which is set forth herein.
NOTE: When returning an instrument to the factory for service:
ƒ Be sure to include paperwork.
ƒ A purchase order, return address and telephone number will assist in the expedient repair and return of your unit.
ƒ Include any specific instructions.
ƒ For warranty service, include date of purchase
ƒ If you require an estimate, please contact ENMET Corporation.
There is Return for Repair Instructions and Form on the last pages of this manual. This form can be copied or used as
needed.
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OMNI-4000 S/N 6705 and above
ENMET Corporation
Addendum: Calibration with Pump Module
It is highly recommended that all calibrations be done with the pump module in operation. This requires special
cylinder adapters called Flow Demand Regulators. They are available from ENMET Corp. under part number:
ƒ 03510-001 for 17 liter cylinders
ƒ 03510-002 for 34 liter cylinders.
The calibration procedures are the same as for standard ambient monitoring devices.
Tubing to
Pump Module
Gas Cylinder
Flow Demand
Regulator
Figure A-1: Calibration with Pump Module
Addendum: Calibration of Ozone
Ozone sensors have cross sensitivity to some other gasses such as chlorine and NO2. The sensitivity of the ozone
sensor is much greater than these other gasses. If calibration gas levels of gasses such as Chlorine and NO2 are
applied while the ozone sensor is installed it will cause sever over reaction on the ozone sensor. If an ozone sensor is
to be calibrated it should be removed during all other sensor calibrations. The ozone sensor should be reinstalled and
then calibrated only after all other sensors have been calibrated.
The above factors should also be considered when monitoring relatively high concentration of other gases
For accurate detection of O3, channels with installed NO2 or Cl2 smart blocks, should be disabled. See section 1.6.1.
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ENMET Corporation
OMNI-4000 S/N 6705 and above
Notes:
62
PO Box 979
680 Fairfield Court
Ann Arbor, Michigan 48106-0979
734.761.1270 Fax 734.761.3220
Returning an Instrument for Repair
ENMET instruments may be returned to the factory or any one of our Field Service Centers for
regular repair service or calibration. The ENMET Repair Department and Field Service Centers
also perform warranty service work.
When returning an instrument to the factory or service center for service, paperwork must be
included which contains the following information:
¾
A purchase order number or reference number.
¾
A contact name with return address, telephone and fax numbers
¾
Specific instructions regarding desired service or description
of the problems being encountered.
¾
Date of original purchase and copy of packing slip or invoice
for warranty consideration.
If a price estimate is required, please note it accordingly and be
sure to include a fax number.
Providing the above information assists in the expedient repair and return of your unit.
¾
Failure to provide this information can result in processing delays.
ENMET charges a one hour minimum billing for all approved repairs with additional time billed
to the closest tenth of an hour. All instruments sent to ENMET are subject to a minimum $30
evaluation fee, even if returned unrepaired. Unclaimed instruments that ENMET has received
without appropriate paperwork or attempts to advise repair costs that have been unanswered,
after a period of 60 days, may be disposed of or returned unrepaired COD with the evaluation
fee.
Service centers may have different rates or terms. Be sure to contact them for this information.
Repaired instruments are returned by UPS/FedEx Ground and are not insured unless
otherwise specified. If expedited shipping methods or insurance is required, it must be
stated in your paperwork.
Note: Warranty of customer installed components.
If a component is purchased and installed in the field, and fails within the warranty term,
it can be returned to ENMET and will be replaced, free of charge, per ENMET’s returned
goods procedure.
If the entire instrument is returned to ENMET Corporation with the defective item
installed, the item will be replaced at no cost, but the instrument will be subject to labor
charges at half of the standard rate.
Repair Return Form
Mailing Address:
ENMET Corporation
PO Box 979
Ann Arbor, Michigan 48106
Phone Number:
FAX Number:
Shipping Address:
ENMET Corporation
Attn: Repair Department
680 Fairfield Court
Ann Arbor, Michigan 48108
734.761.1270
734.761.3220
Your Mailing Address:
Your Shipping Address:
Contact Name: __________________________
Your Phone: _______________________
Your PO/Reference Number: _______________ Your FAX:
Payment Terms:
(Check one)
_______________________
T COD
T VISA / MasterCard______________________
Card number
________
Expiration
Return Shipping Method:
T UPS: T Ground
T 3 Day Select
T Next Day Air T ND Air Saver T 2-Day Air
T Federal Express:
T Ground T Express Saver
T P-1 T Standard T 2-Day Air
T FedEx Account number: ________________________
Would you like ENMET to insure the return shipment?
T No
T Yes
Insurance Amount: $_________________
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