MSA MultiGard 5000 User manual

3103-1001 Rev. 0
MULTIGARD®5000 GAS SAMPLING SYSTEM
DOCUMENTATION PACKAGE
Description
Section
Ultima X Series Gas Monitor, Product Information CD, P/N 10042446
1
MULTIGARD 5000 SYSTEM CONFIGURATION DATA
MultiGard System Configuration
User Configured Outputs Planning Matrix
2
MULTIGARD 5000 SYSTEM OPERATION AND MAINTENANCE
MANUAL
Custom Functions and Feature Descriptions
3103-1001 Rev. 0
3
SENSOR / ANALYZER MANUALS
Ultima® X Gas Series Gas Monitor, P/N 10036101
Ultima/Ultima X Series Controller and Calibrator, P/N 813379
ChemGard Manual P/N 10031540
4
MULTIGARD 5000 SYSTEM SUPPORT DOCUMENTS
Safe Handling of Compressed Gasses in the Laboratory and Plant
Matheson BR-11
Replacement Parts Form

Section 1
MULTIGARD®5000 SYSTEM
CONFIGURATION DATA
Instrument Division 1-800-MSA-INST or FAX [phone]
MSA International [phone] or FAX [phone]
In Canada 1-800-267-0672 or FAX [phone]
Manufactured by
MSA North America
1000 Craberry Woods Drive Cranberry Township, PA 16066

MSA CORPORATE CENTER
1000 Cranberry Woods Drive
Cranberry Township, Pennsylvania 16066
MultiGard®5000
System Configuration Data
Contents
1. Custom System Definition
2. Factory Configured Parameters
3. User Configured Parameters
4. User Configured Outputs Planning Matrix - Option # 1
5. User Configured Outputs Planning Matrix - Option # 2

MultiGard Custom System Definition
System Serial Number:
H17-400913267-11-001 & H17-400913267-11-002
End User:
Thermal Equipment Corp
Job Number:
400913267
ATO:
A-MG5000-C-B-A-B-0-0-A-A-A-B-C
Model:
Single 32
Processor Version:
3102-20 Rev 0
Display Version:
3102-21 Rev 0
System A
System B
Calibration Gases
Zero
Instrument Air
Comb
Propane .6% Span Value 20
CO
CO 60 PPM
Nominal Sensor Flow Rate
3 SCFH +/- .5 SCFH
Minimum Sensor Flow Rate
2 SCFH +/- .5 SCFH
Minimum Sample Line Flow Rate
8 SCFH +/- .5 SCFH
UCO Option # 1
X
Not Installed
(User Configured Outputs)
Form C Relays
Solid State Outputs
UCO Option # 2
X
Not Installed
(User Configured Outputs)
Form C Relays
Solid State Outputs
System Drawings
Drawing Number
DSK3103-
1045
Notes:
System is configured for BACNet
WAN side admin IP is 192.168.1.110:8080
LAN 10.10.79.103 BACNet, Processor 10.10.79.102, Display 10.10.79.101, Router 10.10.79.1
Panelview Plus 7, V9.0

MultiGard Factory Configured Parameters
Sensor 1
Sensor 2
Sensor 3
Sensor 4
Sensor Type (5 characters max)
Comb
CO
NA
NA
Engineering Units
%LEL
PPM
Low Engineering Unit
0
0
High Engineering Unit
100
100
Analog Signal Interface Type
Current
Current
Analog Input Signal Maximum
20
20
Analog Input Signal Minimum
4
4
Warning Direction
Increasing
Increasing
Alarm Direction
Increasing
Increasing
Auto Standardize
Disabled
Disabled
ASTD Tolerance in EGU's, Low
NA
NA
ASTD Tolerance in EGU's, High
NA
NA
Synthetic Span Gas in Use
No
No
Combustible Sensor?
Yes
No
Warning & Alarm Limit in %LEL
60
NA
Purge Operation (comb. sensor)
Yes
No
Purge valve selection (none,
Zero
NA
zero,span1,span2)
Purge Set Point in %LEL
30
NA
Zero
Span 1
Span 2
Sample Purge
Auto Standardize Duration
NA
NA
NA
NA
Auto Standardize Duration System B
NA
NA
NA
NA
Purge Duration (sec.)
30
Purge Duration, System B (sec.)
NA
Manual Control of Span 1 Valve
Yes
Manual Control of Span 2 Valve
Yes
System B Control of Span 1 Valve
NA
System B Control of Span 2 Valve
NA
PIR Ready Enabled
No
PIR Ready Enabled System B
NA

MultiGard Default User Parameters
Password
1
(Open System)
Sensor 1
Sensor 2
Sensor 3
Sensor 4
Trouble Set Points
-5
-5
(all points)
Warning Set Points
20
20
(all points)
Alarm Set Points
30
30
(all points)
Extended Analysis
100
100
(time rate trigger, inc. & dec.)
Extended Analysis
100
100
(increasing level trigger)
Extended Analysis
-100
-100
(decreasing level trigger)
Hysteresis
2
2
(in sensor EGU units)
Analysis Time (sec.)
90
Extended Analysis Time (sec.)
30
(based on slowest sensor)
Analysis Time System B
NA
Extended Analysis Time Sys. B
NA
(based on slowest sensor)
Trouble Relay
Warning Relay
Alarm Relay
Horn Relay
Latched/Non-latched
Latched
Non-Latched
Non-Latched
NA
Fail Safe/Non-Fail Safe
Fail-Safe
Non-Fail Safe
Non-Fail Safe
NA
On Delay (sec.)
0
0
0
0
Off Delay (sec.)
0
0
0
0
System B Latched/Non-latched
NA
NA
NA
NA
System B Fail Safe/Non-Fail Safe
NA
NA
NA
NA
System B On Delay (sec.)
NA
NA
NA
NA
System B Off Delay (sec.)
NA
NA
NA
NA
Days
Hours
Minutes
Timed Auto Standardize # 1
NA
NA
NA
Timed Auto Standardize # 2
NA
NA
NA
Timed Auto Standardize # 3
NA
NA
NA

3103-1001 Rev. 0 1
Section 2
MULTIGARD®5000 SYSTEM
OPERATION AND MAINTENANCE MANUAL
THIS MANUAL MUST BE CAREFULLY READ BY ALL
INDIVIDUALS WHO HAVE OR WILL HAVE THE
RESPONSIBILITY FOR USING OR SERVICING THE
PRODUCT. Like any piece of complex equipment, this instrument
will perform as designed only if it is used and serviced in
accordance with the manufacturer’s instructions. OTHERWISE
IT COULD FAIL TO PERFORM AS DESIGNED AND PERSONS
WHO RELY ON THIS PRODUCT FOR THEIR SAFETY
COULD SUSTAIN SEVERE PERSONAL INJURY OR DEATH.
The warranties made by Mine Safety Appliances Company with respect
to this product are voided if the product is not installed, used and
serviced in accordance with the instructions in this manual. Please
protect yourself and others by following them. We encourage our
customers to write or call regarding this equipment prior to use or for
any additional information relative to use or repairs.
WARNING

3103-1001 Rev. 0 2
MultiGard®5000 System Instruction Manual Outline
1. General Information
1.1 Introduction
1.2 General Operating Specifications
1.3 Terminology
2. Installation
2.1 Receiving
2.2 Unpacking
2.3 Instrument Location Guidelines
2.4 Wiring
2.5 Plumbing
2.5.1 Sample Line Leak Checking
3. System Start-up / Set-up
3.1 Power-Up Sequence
3.2 Sensor/Analyzer Flow Adjustment, Flow Switch Adjustment
3.3 Sample Transport Time
3.4 Dwell Time Parameters
3.5 Actual Dwell Time
3.6 Auto Standardize Mode
4. Operator Interface
4.1 Operational Screens- Open Access
4.1.1 Overview
4.1.2 Gas Levels (and Alarming Status)
4.1.3 Flow Status (Sample and Bypass)
4.1.4 Auto Standardization
4.1.5 Manual Calibration
4.1.6 Sequencer Control (and Point Bypass Status)
4.1.7 Actual Point Pattern
4.1.8 About MultiGard 5000 System and Security Check
4.2 System Set-up Screens- Secure Access
4.2.1 Numerical Data Entry Screen
4.2.2 System Set-up Menu
4.2.3 Set points
4.2.4 User Configured Outputs (UCO) Option
4.2.5 UCO Enables
4.2.6 Extended Set-Up and Sample Transport Times
4.2.7 Sequencer Point Bypass
4.2.8 Sequencer Point Order
4.2.9 Diagnostics
4.2.10 SD Card Access, Password Change and Clock Set

3103-1001 Rev. 0 3
4.2.11 Auto Standardization Set-up
4.2.12 Common Alarming Setup
5. Common Alarming
5.1 Alarm
5.2 Warning
5.3 Trouble
5.4 Horn / Local Buzzer
6. Maintenance
6.1 General Maintenance
6.2 Trouble Shooting
6.3 Replacement Parts
7. User Configured Outputs Option
7.1 Planning Matrix
7.1.1 Output Trigger
7.1.2 Output Characteristics
7.2 Data Entry
7.3 Functionality Testing
8. MultiGard 5000 System Configuration Parameters
8.1 MultiGard 5000 System Factory Configured Parameters
8.2 MultiGard 5000 System User Configured Parameters
9. MultiGard 5000 System Remote Data Display (RDD) Option
9.1 Introduction
9.2 Installation
9.3 Operation
9.3.1 Overview
9.3.2 Gas Levels (and Alarming Status)
9.3.3 Flow Status (Sample & Bypass)
9.3.4 Auto Standardization
9.3.5 Sequencer Control (and Point Bypass Status)
9.3.6 Actual Point Pattern
9.3.7 About MultiGard 5000 System
10. Event Log
10.1 Introduction
10.2 Retrieving Event Log
10.3 Viewing Event Logs
11. Modbus TCP/BACNet IP Configuration
10.1 Introduction
10.2 PC Configuration
10.3 Router Configuration

3103-1001 Rev. 0 4
Sample text related to the dual MultiGard 5000 Systems.
This information can be ignored by users of single MultiGard 5000 Systems.
1. General Information
1.1 Introduction
The MultiGard 5000 Gas Sampling System family consists of six distinct configurations; four
single system configurations (an 8 point system, a 16 point system, a 24 point system and a
32 point system) and two dual system configurations [a dual 8 (“D8”) point system and a dual
16 (“D16”) point system]. A dual system system uses a single operator interface to run two
otherwise independent flow systems identified as System A and System B.
Dual system systems may require additional explanation and therefore, in the appropriate
section, the information provided will be visually distinguished by the text box style as shown
below.
The MultiGard 5000 Gas Sampling System draws gas samples from multiple sample points, and
then passes the gas across up to four sensors/analyzers. The sensors/analyzers may be any variety of
sensors/analyzers manufactured by MSA. Depending on the quantity and type of sensors/analyzers,
they may be mounted internally or externally. At the same time the unit is drawing gas from a
sample point, it is also drawing gas from the next sample point to be sampled. This is decrease the
sample time necessary to achieve an accurate sample reading.
The controller for the MultiGard 5000 Gas Sampling System is the Allen Bradley CompactLogix
L24ER controller. It performs all the necessary tasks associated with sequencing, alarming, fault
conditions, etc.
The user interface is a 10.4” LCD display screen with touch-screen entry. It allows for operator
control of the system. This includes but is not limited to, the entry of user controlled parameters,
silencing the horn and acknowledge alarms.
This manual refers to the standard Installation Drawing, Flow Diagram and Field Wiring Diagram of
the system. Refer to the MultiGard 5000 Custom System Definition data sheet in Section 1 for a
detailed list of the specific drawing numbers that apply to your system.
This manual covers the operation of the MultiGard 5000 Gas Sampling System. Refer to the
appropriate manuals in Section 3 for the operation of the individual sensors/analyzers that are a part
of the system.

3103-1001 Rev. 0 5
1.2 General Operating Specifications
Table 1.1: MultiGard 5000 System Enclosure Specifications
Area Classification
General Purpose for Non-Hazardous Areas
System Configuration
MultiGard
5000
8/16
MultiGard
5000
24/32
MultiGard 5000
Dual 8/Dual 16
Rating
NEMA 1
NEMA 1
NEMA 1
Dimensions*
in (mm)
Width
24 (610)
30 (762)
30 (762)
Height
30 (762)
30 (762)
30 (762)
Depth
12 (305)
12 (305)
12 (305)
Weight, lbs (kg)
150 (68)
150 (68)
175 (80)
*dimensions less options
Operator Interface:
MultiGard 5000 8 / 16 / 24 / 32 / D8 / D16 - 10.4" Diagonal Color TFT LCD Display
Power Requirements:
MultiGard 5000 8 / 16 / 24 / 32 / D8 / D16 - 15 Amp. @ 115 VAC, 60 Hz
Outputs:
Common Alarms - Form C contacts (SPDT), 250 VAC,
Contact Rating
8 Amp. Resistive Load
6 Amp Inductive Load
Optional User Configurable Output (“UCO”) Discrete Alarms - Form C contacts (SPDT), 250 VAC
Contact Rating
10 Amp. Resistive Load
7.5 Amp Inductive Load
Optional User Configurable Output (“UCO”) Solid State Outputs - 100 mA @ 24 Volts DC, Sinking
(Requires external 24 VDC power supply)

3103-1001 Rev. 0 6
Flow System:
Flow Scheme –“Look-Ahead Bypass”
Connection size and thread:
Sample Inlets and Exhausts - 1/8" NPTF
Drain - 1/8" NPTF
Sample Line Tubing - 500' max, with 0.250" OD, 0.175 ID tubing
Sample Line Flow Rate:
20 SCFH typical, No Load
10 SCFH typical, Full Load
Temperature:
Operating- 35 to 95oF (0 to 35oC)
Non-Operating- 14 to 140oF (-10 to 60oC)
Sample- 0 to 140oF (-17 to 60oC)
Humidity:
5 to 85% RH non-condensing
*** Sensors / Analyzers are not reflected in above specifications. ***

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3103-1001 Rev. 0
1.3 Terminology
The following terminology is used throughout this manual. Read and become familiar with the
definitions.
ACTUAL DWELL TIME - The actual time sample is being drawn from a specific sample line and
applied to the sensor(s)/analyzer(s). This value is a function of the dwell time parameters.
ALARM - The indication that a preset alarm level has been exceeded.
ALARMING - The indication of a WARNING, ALARM, or TROUBLE by the MultiGard 5000
unit.
ANALYSIS TIME –the amount of time that a gas sample from the sample location is run past the
sensors independent of any associated transport times. This time is dictated by the slowest
responding sensor on the common sample path.
BYPASS EXHAUST - In this look-ahead system, the bypass gas volume is drawn from the next
area to be sampled and vented.
BYPASS (VALVE, MANIFOLD, PUMP HEAD, FLOW SWITCH) - The plumbing required to
draw on the next point to be sampled.
CALIBRATION - The process of zeroing and spanning a sensor/analyzer.
COALESCER - A filter designed to eliminate condensate from the sample stream.
CONDITION ACKNOWLEDGE - Eliminating a Latched alarming condition indicated by the
MultiGard 5000 unit by depressing the “Condition Acknowledge”button on the Overview screen
after the condition has cleared.
CORRELATION FACTOR - A sensor’s response to a synthetic span-gas in units of sensor reading
per concentration of synthetic span gas.
DEFAULTS FORCED - A condition resulting from the loss of the program memory requiring a
back-up from flash memory. In this state, the MultiGard 5000 unit reverts to functioning as
configured by MSA and all user modifications are nullified.
DRAIN - The volume of sample gas that continuously bypasses the sensor(s) to eliminate
condensate from the sample stream.
DWELL TIME PARAMETERS - The parameters that are used to determine the actual dwell time
of the system on a sample line; analysis time, extended analysis time, sample transport time and
internal transport time.
END OF LINE FILTER - A filter used at the sample entry point to eliminate particulates from the
sample stream.

8
3103-1001 Rev. 0
EXHAUST GAS - Sample gas after it passes across the sensor(s).
EXTENDED ANALYSIS TIME - An increase in analysis time triggered by exceeding a preset
level or rate of change.
FLOW RATE - Volume of gas drawn through the sample line per unit of time.
FRESH AIR - Air that has no possibility of containing gas.
HORN ACKNOWLEDGE - Silencing the operation of the horn and local buzzer by depressing the
horn acknowledge button on the overview screen or an optional remote horn acknowledge switch.
HYSTERESIS - A dead band factor introduced into the warning, alarm and trouble functions to
eliminate the relay from responding to small variations in gas level readings in the proximity of its
actuation set point.
LOOK-AHEAD BYPASS FLOW SCHEME - A sample flow scheme that draws on the current
line being sampled and the next line to be sampled.
MULTIGARD 5000 DUAL SYSTEM –An MSA gas sampling system that uses one MultiGard
5000 controller (PLC) and one MultiGard 5000 operator interface (HMI) to operate two otherwise
independent flow systems.
NORMALLY DE-ENERGIZED / NON FAIL-SAFE - A relay that is open when de-energized,
and closed when energized due to a warning, alarm, or fault. This style relay will NOT alert the user
to a loss of power or a failure in the system wiring.
NORMALLY ENERGIZED / FAIL-SAFE - A relay that is open when energized, and closed
when de-energized due to a warning, alarm, fault, or loss of power. This style relay will alert the
operator when there is a loss of power, or a failure in the system wiring.
NORMAL OPERATING STATE - The absence of any alarming indication.
POINT BYPASS - Removing a point/line number from the sampling sequence.
PURGING (FLOW SYSTEM) -The process of flushing the flow system of residual gas after an
auto standardization has occurred or after an indication of possible sensor saturation on a
combustible sensor.
RELATIVE HUMIDITY –The percentage of total water saturation in the air for a given
temperature.
SAMPLE POINT - The location or area from which a gas sample is drawn. Up to 32 areas
(depending on system configuration), sequentially numbered, can be monitored. In dual systems,
System A and System B may each have up to 16 points (depending on system configuration),
sequentially numbered.

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3103-1001 Rev. 0
SAMPLE TRANSPORT TIME - The duration of time required to deliver a fresh sample from the
sample entry point to the MultiGard 5000 unit.
SENSOR/ANALYZER - A device that generates an electrical signal proportional to the
concentration of the specific gas it was calibrated to detect.
SPAN - Full-scale or up-scale reading on the meter display.
SPAN DRIFT - The deviation of sensor output from actual gas concentration applied.
SPAN GAS VALUE - The gas concentration that gives the instrument a full-scale or up-scale value.
This value is printed on the cylinder containing the calibration gas.
SPANNING - The process of applying span gas to a sensor/analyzer and placing a full-scale or span
gas indication on the unit during calibration.
STANDARDIZATION - The process of compensating for zero-drift and/or span-drift without re-
calibrating the sensor.
STANDARDIZATION HIGH TOLERANCE - The amount of correction to sensor output (in
sensor engineering units) that will result in a trouble condition indication by the MultiGard 5000 unit
and a disabling of the alarm functions.
STANDARDIZATION LOW TOLERANCE - The amount of correction to sensor output (in
sensor engineering units) that will result in a trouble condition indication by the MultiGard 5000 unit
while continuing to operate.
SYNTHETIC SPAN GAS - A gas that causes an up-scale reading used in place of the original span
gas for which the sensor/analyzer was calibrated.
TROUBLE - The indication that a fault condition has occurred.
USER CONFIGURED OUTPUT (UCO) - An output in the form of a solid state output or form C
relay contacts whose functionality may be defined by the end user.
WARNING - The indication that a preset warning level has been exceeded.
ZERO - A zero (0) indication on the meter display usually indicates fresh air (no gas present).
ZERO DRIFT - The deviation of sensor output when zero gas is applied.
ZEROING - The process of applying zero gas to a sensor/analyzer and placing a zero gas indication
on the unit during calibration.

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3103-1001 Rev. 0
2. Installation
2.1 Receiving
Upon receipt of the unit, inspect the shipping cartons for signs of visible damage. Report any damage
to the carrier and note it on the receipt. The unit must be stored in a dry, secure place prior to its
installation and use. Store the unit in its original shipping carton.
2.2 Unpacking
To unpack the equipment, carefully remove the unit from its shipping container(s) in order to prevent
damage to sensitive electrical components. DO NOT use the coalescing filter assembly to lift the
unit as damage may occur. If any damage is found, report it to the shipper immediately. Search
through all packing material and containers to avoid inadvertently discarding usable or valuable
items. Report any item shortages immediately to MSA.
Using a screwdriver, open the door by turning 1/4 turn latches on the front of the door counter
clockwise (see Installation Drawing). Remove any packing material that may be found inside the
unit. Carefully inspect components and assemblies inside the unit. If damage or item shortage is
evident, advise the carrier. Remove the coalescing filter plug
2.3 Instrument Location Guidelines
The instrument’s performance is dependent on its location. Follow the guidelines below when
mounting the unit.
1. Acquire the appropriate hardware and locate the unit where personnel will see the display before
they enter the area being monitored.
2. Always mount the unit vertically with the display at eye level.
3. Do not mount the unit to structures subject to vibration and/or shock.
4. Do not locate the unit near an excessive heat source or in wet or damp locations.
5. Do not mount the unit in direct sunlight.
6. For proper cooling, allow at least six inches of clearance around all surfaces of the unit. Insure
that the cooling intakes on the base of the unit are free from obstructions that could block the flow of
air. The cooling exhaust hood on the top of the unit should be unobstructed and positioned off the
mounting surface as far as feasible for the installation.
7. Allow for unimpeded operation of the front door (see Installation Drawing) to allow access for
service and calibration.

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3103-1001 Rev. 0
2.4 Wiring
All wiring to the MultiGard 5000 unit should be made via the plate at the bottom of the unit. Wire
120 VAC, 60 Hz single phase power to the MultiGard 5000 input terminals (see Field Wiring
Diagram) using a minimum of #16 AWG wire. A separate dedicated power source is recommended
to ensure that the unit remains powered when other circuits are shut down for servicing or routine
maintenance. The power source should be a “ground neutral” system. When a step down transformer
is used, an ungrounded or floating system can result. If an isolation transformer is used, the neutral
side of the secondary transformer should be grounded. Always conform to NEMA and NEC
standards pertaining to installations of this type.
Refer to the wiring diagram showing interconnecting wire between the unit and any other devices.
Relay wiring should be separate from power wiring. Each relay has contacts for normally open,
normally closed and common terminals. Wire to the trouble relays normally closed contact (contact
closed due to loss of power) to provide for fail-safe relay activation on loss of power.
WARNING
Wire Trouble Relay to operate an externally powered device (horn,
beacon, computer, PLC, etc.) using the common and normally closed
contacts for fail-safe operation on loss of power. The Trouble Relay
is an important safety device and failure to wire as specified will
result in no indication should gas detection system malfunction
and/or become disabled.
The horn and local buzzer can be silenced by pressing the HORN ACKNOWLEDGE button on the
Overview screen or through an optional remote horn acknowledge switch (see Field Wiring
Diagram).
CAUTION
Do not connect any system controlled process shut down circuits
until the system has been function checked, calibrated and is ready
for normal operation. False alarms may occur if this connection is
done before full system startup is completed.

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3103-1001 Rev. 0
2.5 Plumbing
NOTE: This section specifically applies to the standard MultiGard 5000 system look-ahead bypass
flow scheme. Refer to Section 1 if your system employs a custom flow scheme.
Remove all shipping plugs from sample point inlets, exhausts and drain.
Sample point supply lines should be 0.250" OD, 0.175" ID, with a maximum sample line length of
500 ft. As a general rule, sample lines should be kept as short as possible to reduce sample transport
time.
Sample point tube entries should be placed in areas that provide the unit with the best representative
gas sample to be detected. In large areas where multiple sample point entries are located, air flow
patterns must be taken into considered. Ventilation smoke tubes (P.N. 458480) are useful in
determining air flow patterns in ambient sampling areas.
The samples must be adequately filtered and free of any liquid contamination before entering the
system. End of line particulate filters must be installed at all sample point tube entries (see Flow
Diagram). The sample point tube entries must be unobstructed to allow the gas sample to flow freely
to the system. Use only materials that are compatible with the gases in the sample flow system to
ensure an accurate gas sample is delivered to the system. Ensure that all tubing bends are wide
enough to prevent kinking or restriction in sample flow.
When connecting fittings to the sample point inlets, exhaust, and/or drain ports, be sure to not over-
tighten the fittings. Overtightening the fittings may cause damage to the sample point manifold.
Exhaust and drain gas flow should be properly vented to a safe area. When exhausting outdoors,
make sure that rain or water sources cannot enter the exhaust lines. Do not combine any
sensor/analyzer exhausts or drain lines. Increase exhaust line diameter by a minimum of 1/8" per 20
ft. of exhaust line. Do not back pressure the exhaust lines by restricting flow. Exhaust lines should
also be checked for obstructions. Also, do not connect exhaust lines to a vacuum source.
2.5.1 Sample Line Leak Checking
WARNING
Leak-check all sample lines at start up and regularly thereafter.
Leaking sample lines will cause sample dilution and lead to
erroneous lower than actual readings. Failure to leak-check the
sample lines may result in a hazardous condition.