MSA Chillgard LS User manual

Chillgard® LS
Refrigerant Monitor
Instruction 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 the product
are voided if the product is not 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.
IN NORTH AMERICA: 1-800-MSA-INST. or FAX [phone]
IN CANADA: 1-800-267-0672 or FAX [phone]
MSA INTERNATIONAL [phone] or FAX [phone]
© MINE SAFETY APPLIANCES COMPANY 2009 - All Rights Reserved
This manual is available on the internet at www.msanet.com
Manufactured by
MSA NORTH AMERICA
P.O. Box 427, Pittsburgh, Pennsylvania 15230
(L) Rev 7 10035164
"WARNING

i
Chillgard LS Diffusion Refrigerant Monitor
Chillgard LS Pumped Refrigerant Monitor

MSA Permanent Instrument Warranty
1. Warranty- Seller warrants that this product will be free from
mechanical defect or faulty workmanship for a period of two years
from date of shipment, provided it is maintained and used in
accordance with Seller's instructions and/or recommendations. This
warranty does not apply to expendable or consumable parts whose
normal life expectancy is less than one (1) year such as, but not
limited to, non-rechargeable batteries, filament units, filter, lamps,
fuses etc. The Seller shall be released from all obligations under
this warranty in the event repairs or modifications are made by
persons other than its own or authorized service personnel or if the
warranty claim results from physical abuse or misuse of the
product. No agent, employee or representative of the Seller has
any authority to bind the Seller to any affirmation, representation or
warranty concerning the goods sold under this contract. Seller
makes no warranty concerning components or accessories not
manufactured by the Seller, but will pass on to the Purchaser all
warranties of manufacturers of such components.
THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES,
EXPRESSED, IMPLIED OR STATUTORY, AND IS STRICTLY
LIMITED TO THE TERMS HEREOF. SELLER SPECIFICALLY
DISCLAIMS ANY WARRANTY OF MERCHANT ABILITY OR OF
FITNESS FOR A PARTICULAR PURPOSE.
2. Exclusive Remedy- It is expressly agreed that Purchaser's sole
and exclusive remedy for breach of the above warranty, for any
tortious conduct of Seller, or for any other cause of action, shall be
the repair and/or replacement at Seller's option, of any equipment
or parts thereof, which after examination by Seller is proven to be
defective. Replacement equipment and/or parts will be provided at
no cost to Purchaser, F.O.B. Seller's Plant. Failure of Seller to
successfully repair any non-conforming product shall not cause the
remedy established hereby to fail of its essential purpose.
3. Exclusion of Consequential Damage- Purchaser specifically
understands and agrees that under no circumstances will seller be
liable to purchaser for economic, special, incidental or
consequential damages or losses of any kind whatsoever, including
but not limited to, loss of anticipated profits and any other loss
caused by reason of non-operation of the goods. This exclusion is
applicable to claims for breach of warranty, tortious conduct or any
other cause of action against seller.
ii

1. Each instrument described in this manual must be installed,
operated, and maintained in strict accordance with its labels,
cautions, warnings, instructions, and within the limitations stated.
2. These monitors must not be installed in outdoor areas or in areas
or locations where explosive concentrations of combustible gases
or vapors might occur in the atmosphere: Class 1, Group A, B, C,
and D areas as defined by the NEC. Because the monitors are not
explosion-proof, they must be located in non-hazardous areas.
3. The Chillgard LS Refrigerant Monitor is designed to detect
refrigerant gases in the air. It cannot measure the concentration of
these gases in a steam type atmosphere.
4. As with all gas detection instruments of this type, high levels of or
long exposure to certain compounds in the tested atmosphere
contaminate the sensor. In atmospheres where the monitor may be
exposed to such materials, calibration must be performed
frequently to ensure that system operation is dependable and its
indications accurate.
5. The Chillgard LS Refrigerant Monitor must not be painted.
Painting will interfere with the sampling process of the instrument.
If painting is being done in an area where the instrument is located,
care must be exercised to insure that paint is not put or splashed
on the instrument.
6. The only absolute method to assure the proper overall operation
of a gas detection instrument is to check it with a known
concentration of the gas for which it has been calibrated.
Consequently, a calibration check must be included as part of
the routine inspection of the system.
7. The sensor is a sealed unit. Do not attempt to modify or adjust the
sensing cell.
8. Use only genuine MSA replacement parts when performing any
maintenance procedures provided in this manual. Failure to do so
may seriously impair instrument performance. Repair or alteration
of the Chillgard LS Refrigerant Monitor, beyond the scope of these
maintenance instructions or by anyone other then an authorized
MSA service person, could cause the product to fail to perform as
designed, and persons who rely on this product for their safety
could sustain serious personal injury or death.
9. Ensure that the Chillgard LS Refrigerant Monitor is installed in a
clean and dry area as possible.Install splash or rain shields on the
instrument to keep water and other contaminants away from the
instrument. If you fail to follow this warning, equipment damage
can occur.
iii
"! WARNINGS

10.Ensure that the Chillgard LS Refrigerant Monitor and the area the
instrument is monitoring is at the same temperature before
operation of the instrument; otherwise, condensation will form and
possibly clog or fill the gas sensor in the instrument rendering the
instrument inoperable.
11. Protect the Monitor from vibration and heating; otherwise, improper
operation may result, which can result in personal injury or death.
FAILURE TO FOLLOW THE ABOVE WARNINGS CAN RESULT IN SERIOUS
PERSONAL INJURY OR DEATH.
iv

v
Table of Contents
Chapter 1
General Information . . . . . . . . . . . . . . . . . . . .1-1
Figure 1-1. Identification Label Location . . . . . . . . .1-1
Terminology Used in this Manual . . . . . . . . . . . . . . . . . .1-2
General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3
Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3
Table 1-1. General Operating Specifications
for all Models . . . . . . . . . . . . . . . . . . . . . . . . .1-4
Table 1-2. Typical Chillgard LS / R-11
Cross-Sensitivity Response Data . . . . . . . . . .1-5
Table 1-3. Typical Chillgard LS / R-12
Cross-Sensitivity Response Data . . . . . . . . . .1-5
Table 1-4. Typical Chillgard LS / R-22
Cross-Sensitivity Response Data . . . . . . . . . .1-6
Table 1-5. Typical Chillgard LS / R-123
Cross-Sensitivity Response Data . . . . . . . . . .1-6
Table 1-6. Typical Chillgard LS / R-134 A
Cross-Sensitivity Response Data . . . . . . . . . .1-7
Chapter 2
Installation and Set-up . . . . . . . . . . . . . . . . . .2-1
Unpacking the System . . . . . . . . . . . . . . . . . . . . . . . . . .2-1
Initial Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1
Sensor Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1
Pumped Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1
Diffusion Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2
"CAUTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2
Mounting the Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-3
Five rules for proper mounting . . . . . . . . . . . . . . . . . . .2-3
Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-3
"WARNING . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-3
Figure 2-1. Diffusion Style Mounting Dimensions . .2-4
Figure 2-2. Four-Point Pumped Style
Mounting Dimensions . . . . . . . . . . . . . . . . . . .2-5

Wiring Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-6
Opening the Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-6
Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-6
"CAUTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-6
"CAUTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-6
Figure 2-3. Diffusion Style Electrical Connections . .2-7
Figure 2-4. Four-Point Pumped Style
Electrical Connections . . . . . . . . . . . . . . . . . .2-7
For 24 V DC or AC Wiring . . . . . . . . . . . . . . . . . . . . . .2-8
For 110/220 VAC Wiring . . . . . . . . . . . . . . . . . . . . . . .2-8
Figure 2-5. Sensor Board Connections . . . . . . . . . .2-8
Analog Signal Output Wiring . . . . . . . . . . . . . . . . . . . .2-9
Chapter 3
Start-up and Initial Adjustments . . . . . . . . . .3-1
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1
Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1
General Calibration (All Models) . . . . . . . . . . . . . . . . .3-1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1
Chapter 4
Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1
Figure 4-1. Calibration Equipment . . . . . . . . . . . . . .4-1
"WARNING . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1
Diffusion Version Calibration . . . . . . . . . . . . . . . . . . . . .4-1
Calibration Equipment - (FIGURE 4-1) . . . . . . . . . . . .4-1
Initial Calibration Procedures . . . . . . . . . . . . . . . . . . . .4-2
Preparation for Calibration . . . . . . . . . . . . . . . . . . . . . .4-2
Initial Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-2
"CAUTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-2
"CAUTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-2
Figure 4-2. Applying Calibration Gas
to the Chillgard LS Refrigerant Monitor . . . . .4-3
Calibration Guidelines . . . . . . . . . . . . . . . . . . . . . . . . .4-4
Calibration Equipment . . . . . . . . . . . . . . . . . . . . . . . . .4-4
Calibration Check Procedure . . . . . . . . . . . . . . . . . . . .4-5
Applying Calibration Gases to the Instrument . . . . . . .4-5
vi

"CAUTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-5
Four-Point Pumped Version Calibration . . . . . . . . . . . . .4-6
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-6
Calibration Equipment . . . . . . . . . . . . . . . . . . . . . . . . .4-6
"CAUTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-6
Figure 4-3. Kit Components . . . . . . . . . . . . . . . . . . .4-7
"CAUTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-7
Table 4-1. RP Calibration Gases . . . . . . . . . . . . . .4-8
Calibration Procedures . . . . . . . . . . . . . . . . . . . . . . . .4-8
Preparation for Calibration . . . . . . . . . . . . . . . . . . . . . .4-8
"CAUTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-8
"WARNING . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-8
"CAUTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-8
Initial Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-9
Calibration Guidelines . . . . . . . . . . . . . . . . . . . . . . . . .4-9
Calibration Equipment . . . . . . . . . . . . . . . . . . . . . . . .4-10
Calibration Check Procedure . . . . . . . . . . . . . . . . . . .4-10
Zeroing the Monitor . . . . . . . . . . . . . . . . . . . . . . . . . .4-10
"WARNING . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-10
Figure 4-4. Using Zero Scrubber
for Zero Calibration . . . . . . . . . . . . . . . . . . . .4-11
Figure 4-5. Using Zero Gas Cylinder
for Zero Calibration . . . . . . . . . . . . . . . . . . . .4-11
Figure 4-6. Span Calibration . . . . . . . . . . . . . . . . .4-12
"CAUTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-12
"CAUTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-13
Chapter 5
Service and Replacement Parts . . . . . . . . . .5-1
Troubleshooting Guidelines . . . . . . . . . . . . . . . . . . . . . .5-1
Table 5-1.Troubleshooting Guidelines . . . . . . . . . .5-1
Table 5-2. Calibration Accessories Parts List . . . . .5-2
Table 5-3. Replacement Parts List . . . . . . . . . . . . .5-3
Service and Assistance . . . . . . . . . . . . . . . . . . . . . . . . .5-4
vii

Appendix A
Installation Outline Drawings . . . . . . . . . . . .A-1
Figure A-1. Diffusion Style Chillgard LS
Installation Drawing . . . . . . . . . . . . . . . . . . . .A-1
Appendix B
RS-485 Output . . . . . . . . . . . . . . . . . . . . . . . .B-1
Table B-1. Dip Switch Positions . . . . . . . . . . . . . . .B-1
Table B-2. Sensor Unit Register Addresses . . . . .B-2
viii

1-1
Chapter 1
General Information
The Chillgard LS Refrigerant Monitor provides a continuous indication of
a refrigerant concentration in air. It is capable of monitoring a refrigerant
from 0 to 1000 parts per million (ppm). Each instrument is factory-
calibrated to a certain full-scale value of a specific refrigerant.
All Chillgard LS Refrigerant Monitors use infrared photo-acoustic
sensors. These sensors give an indication of refrigerant levels without
requiring oxygen to be present. Also, the sensors are not poisoned or
degraded in the presence of most silicon or sulfur compounds.
Each Chillgard LS Refrigerant Monitor is placed in an area where a
refrigerant is anticipated or must be controlled. The Monitor operates in
either the Diffusion style (gas diffuses into the sensor through the
opening located at the bottom of the unit) or the Pumped style (an
internal pump draws the sample into the sensor from a remote location).
The gas sensor determines the refrigerant concentration and outputs an
electrical analog signal proportionate to the concentration.
The Chillgard LS Refrigerant Monitor contains all components
necessary to properly sample an area or duct for a refrigerant.
This manual describes all of the various Chillgard LS Refrigerant
Monitors, although your monitor may not be equipped with all of the
options available.
To help determine what options are on your unit, see the identification
label on the side of the instrument (FIGURE1-1).
Figure 1-1. Identification Label Location

1-2
This label contains:
• model number
• the refrigerant that the unit will detect
• information concerning proper voltages and frequency
required to power the unit
Terminology Used in this Manual
FLOW RATE:
Volume of gas drawn through the sample line per minute.
EXHAUST GAS:
Sample gas after it passes through the sensor.
FRESH AIR:
Air that has no possibility of containing refrigerant gas. Contamination
with refrigerant gas would interfere with the calibration and the flushing
of the instrument.
ZERO:
A zero (0) output usually indicates ambient air present or no refrigerant
gases present.
SCRUBBER:
An activated carbon filter which removes and cleans the span gas in the
calibration operation prior to exhausting excess gas to ambient air.
ZEROING:
The process of placing a zero indication on the output of the instrument.
SPAN:
A full-scale or up-scale reading on the output of the instrument.
SPANNING:
The process of placing a full-scale or up-scale output of the instrument.

SPAN GAS VALUE:
The gas “concentration” that gives the instrument a full-scale or up-
scale output; this value is usually printed on the gas cylinder.
General Description
The Chillgard LS Refrigerant Monitor:
• provides a continuous indication of a refrigerant
gas concentration
• operates on the photo acoustic principle, and measures the
concentration of a refrigerant in a complex mixture of
background gases.
In the photo acoustic principle, sample gas is delivered to an
enclosed chamber which is periodically bombarded with infrared
(IR) radiation. If the target gas is present, it absorbs IR with each
pulse of light. These pulses are miniature sound waves which are
picked up by a microphone. The sound level is directly proportional
to the target gas concentration present in the gas chamber.
• is capable of measuring a refrigerant 0 to 1000 ppm full scale
• is housed in a rugged plastic enclosure
• has a standard 4 to 20 mA and RS-485 output
• has five LEDs to indicate power, fault and alarm conditions
• is highly selective to enable operation in areas with varying
humidity or in areas containing other contaminants. It may be used
for applications requiring long-term stability and low maintenance.
Applications
The Chillgard LS Refrigerant Monitor is factory-calibrated for a
refrigerant and can be used for applications such as:
• ventilation control
• ambient air monitoring for health and safety purposes.
1-3

Table 1-1. General Operating Specifications for all Models
PERFORMANCE SPECIFICATIONS
LINEARITY 20 to 100 ppm +5 ppm
100 to 1000 ppm +6% of reading
REPEATABILITY +8 ppm
WARM-UP TIME 10 minutes
RESPONSE TIME 50% of a step-change in < 70 seconds
OPERATING TEMP. 0 to 40oC (32 to 104oF)
TEMP. EFFECT < 4% / 10oC
RELATIVE HUMIDITY 0 to 95%, RH non-condensing
RH EFFECT R11: less than 3% full scale
Other refrigerants: less than 1.5% full scale
OPERATING SPECIFICATIONS
POWER REQUIREMENTS 24 VDC, +10%, -0%, .85A
24 VAC, +10%, 50/60 Hz, .80A
100 to 240 VAC, 50/60, Hz, .3A
ANALOG OUTPUT 4 to 20 mA, non-isolated, sourcing
DEFAULT ALARM VALUES R123: 50, 150, 300 ppm
Other applications: 50, 150, 1000 ppm
MAX. OUTPUT SIGNAL LOAD 500 ohms
DIMENSIONS 7.1" high x 10" wide x 4.25" deep
DIFFUSION VERSION (188 mm high x 110 mm wide x 70 mm deep)
DIMENSIONS 14.7" high x 11.2" wide x 5" deep
PUMPED VERSION (373 mm high x 284 mm wide x 127 mm deep)
WEIGHT DIFFUSION VERSION 3.7 pounds (1.678 kg.)
WEIGHT PUMPED VERSION 9.5 pounds (4.308 kg.)
SAMPLE FLOW RATE Typically 1.5 LPM; .
PUMPED VERSION .75 LPM with maximum tubing length
MAX. SAMPLE TUBING LENGTH PUMPED VERSION 300 feet with 1/8" ID tubing
MAX. EXHAUST TUBING LENGTH PUMPED VERSION 30 feet with 1/4" ID tubing
TRANSPORT AND STORAGE CONDITIONS
TEMP. -40 to 60oCentigrade (-40 to 140oF)
HUMIDITY 0 to 99% relative humidity
POLLUTION DEGREE AND INSTALLATION CATEGORY 2
ALTITUDE 2000 meters maximum
1-4

Table 1-2. Typical Chillgard LS / R-11 Cross-Sensitivity Response Data
GAS CONCENTRATION (PPM) EQUIVALENT PPM R-11
Acetone 100 14
Methyl Ethyl Ketone 100 32
Methanol 1000 130
iso-Propanol 500 400
Methylene Chloride 100 0
Xylene 100 0
Ammonia 50 0
R-113 100 25
R-11 100 100
R-22 100 30
R-12 983 490
R-134 A 100 20
R-123 100 3
Propane 0.6% 18
Ethylene 500 20
TEST CONDITIONS: Calibrated 0-1000 PPM R-11 in N2; Temperature: 25OC
Table 1-3. Typical Chillgard LS / R-12 Cross-Sensitivity Response Data
GAS CONCENTRATION (PPM) EQUIVALENT PPM R-12
Acetone 100 3
Methyl Ethyl Ketone 1000 25
Methanol 1000 2
Methylene Chloride 1000 14
Trichloroethylene 1000 167
Ethyl Acetate 1000 22
Xylene (ortho-Xylene) 1000 5
R-113 100 35
R-11 100 5
R-22 100 1
R-12 100 100
R-134 A 100 2
R-114 100 45
TEST CONDITIONS: Calibrated 0-1000 PPM R-12 in N2; Temperature: 25OC
1-5

Table 1-4. Typical Chillgard LS / R-22 Cross-Sensitivity Response Data
GAS CONCENTRATION (PPM) EQUIVALENT PPM R-22
Acetone 100 <1
R-11 100 16
R-123 100 35
R-134 A 100 25
R-132 A 100 40
R-22 100 100
R-113 100 39
TEST CONDITIONS: Calibrated 0-1000 PPM R-22 in N2; Temperature: 25OC
Table 1-5. Typical Chillgard LS / R-123 Cross-Sensitivity Response Data
GAS CONCENTRATION (PPM) EQUIVALENT PPM R-123
Acetone 100 22
Methyl Ethyl Ketone 500 48
Methanol 100 2
iso-Propanol 100 5
Methylene Chloride 1000 14
Trichloroethylene 1000 4
Ethyl Acetate 100 42
Xylene (ortho-Xylene) 1000 5
Ammonia 910 7
Natural Gas 1000 5
R-113 100 80
R-11 100 <1
R-22 100 4
R12 100 8
R-134 A 100 140
R-123 100 100
TEST CONDITIONS: Calibrated 0-1000 PPM R-123 in N2; Temperature: 25OC
1-6

Table 1-6. Typical Chillgard LS / R-134 A Cross-Sensitivity Response Data
GAS CONCENTRATION (PPM) EQUIVALENT PPM R-134 A
Acetone 100 15
Methyl Ethyl Ketone 500 30
Methanol 100 1
iso-Propanol 100 3
Methylene Chloride 1000 10
Trichloroethylene 1000 3
Ethyl Acetate 100 28
Xylene (ortho-Xylene) 1000 3
Ammonia 910 5
Natural Gas 1000 3
R-113 100 55
R-11 100 <1
R-22 100 3
R12 100 6
R-134 A 100 100
R-123 100 70
TEST CONDITIONS: Calibrated 0-1000 PPM R-134 A in N2; Temperature: 25OC
1-7

Chapter 2
Installation and Set-up
Unpacking the System
To unpack the Chillgard LS Refrigerant Monitor:
• Carefully remove the unit from its shipping container(s) to prevent
damage to sensitive electrical and gas sensing components.
• Search through packing material and inside of the containers to
prevent inadvertently discarding usable or valuable parts.
• Remove the plastic screws holding the cover to the enclosure.
• Remove the front cover from the Chillgard LS Refrigerant Monitor
to expose the electrical printed circuit board.
Initial Inspection
With the front cover open, carefully inspect the components and
assemblies inside the enclosure. If damage or shortage is noted,
promptly make the proper claim with the carrier.
Sensor Location
Pumped Units
Pumped units use an internal sample pump to pull refrigerant gas from
a remote location(s). The visual indication for the unit is located on the
front of the unit. Other outputs are available on the device which can be
used to provide indication of gas concentration, alarm status, and
instrument status.
Refrigerants concentrate near the floor. In typical mechanical equipment
room applications, sampling 12-18 inches above the floor is sufficient
for early warning and to provide adequate protection for someone
working close to the floor. If it is expected that an occupant's breathing
zone may be less than 12-18 inches off the floor, locate the sampling
point accordingly.
NOTE: Select sampling locations that result in the shortest possible line
length in order to reduce transport time.
Consider the following guidelines when selecting the location for the
sampling point(s).
2-1

1. Most refrigerants are heavier than air and sink to the floor or
accumulate in low areas.
2. Place the end of the sampling line in an area that provides the
instrument with a representative sample; ventilation Smoke Tubes
(P/N 458480) are useful in determining air flow patterns in ambient
sampling areas.
3. Properly exhaust the instrument to a safe area or to outside
atmosphere.
4. Ensure the sampling area is free of particulate matter and
condensing moisture; ensure sample lines will not draw moisture
up into the line.
NOTE: The sample gas must be adequately filtered before
entering the instrument. End-of-sample-line filters must be
used with the unit. These filters must be installed at the
end of all sample lines.
5. Ensure the end of the sampling line is unobstructed to allow the
sample to flow freely to the instrument.
6. Keep sample lines as short as possible to reduce transport time.
Ensure that tubing radii are wide enough to prevent kinking
or bending. Otherwise, an obstruction may occur, preventing
the instrument from sampling the intended area.
7. DO NOT:
• back-pressure the exhaust line or
• connect it to a vacuum source or
• install a flow meter in the exhaust line.
ALWAYS :
connect an exhaust line that is vented to a safe area or
an outside atmosphere.
Diffusion Units
Diffusion units sample the refrigerant gas located at the base of the
refrigerant monitor. The visual indication for the unit is located on the
front of the unit. Other outputs are on the device can be used to provide
gas concentration, alarm status, and instrument status indications.
Consider the following guidelines when selecting the location for the
sampling point(s):
"CAUTION
2-2

1. Most refrigerants are heavier than air and sink to the floor or
accumulate in low areas.
2. Place the instrument in an area that provides it with a
representative sample; ventilation Smoke Tubes (P/N 458480) are
useful in determining air flow patterns in ambient sampling areas.
3. Ensure that the area around the instrument is unobstructed to
allow the sample to flow freely to the instrument.
4. If the unit’s visual indication is used to alert workers of potential
gas hazards, mount the instrument in a clearly visible location.
NOTE: The diffusion unit is appropriate for applications where the
indication panel is clearly visible with the unit mounted 12-18
inches off the floor; otherwise, a pumped unit located at eye
level with sensor points located 12-18 inches off the floor may
be more appropriate.
Mounting the Unit
Five Rules for Proper Mounting
1. Do not mount the unit to structures subject to vibration and shock.
2. Do not locate the unit near an excessive heat source.
3. For proper cooling, allow at least three inches of clearance around
all surfaces, except for the mounting surface.
4. Do not mount the unit where it will be exposed to direct solar
heating, rain and splashing water.
5. Mount the unit where it is accessible for maintenance.
Mounting
Do not mount more than one pumped unit to the same mounting
structure. Mechanical vibration produced from one unit can cause
improper gas readings on another unit.
Do not locate these units in an area that may contain a flammable mixture
of gas and air; otherwise, an explosion may occur.
Install the Chillgard LS Refrigerant Infrared Monitor in the area where a
refrigerant is anticipated or control of the gas is desired.
Ventilation Smoke Tubes (P/N 458480) are useful in determining air flow
patterns in ambient sampling areas.
"WARNING
2-3

1. Open the unit by removing the plastic screws securing the lid to the
enclosure.
2. Using #10 mounting screws or bolts (FIGURES 2-1 and 2-2),
securely mount the Chillgard LS Refrigerant Monitor to a wall or
flat mounting surface via the four holes that run through the
enclosure base.
3. When applying an external sample line to the pumped unit, use the
fittings provided at the bottom of the enclosure. Do not place any
restriction on the exhaust port located on the right side of the
enclosure. Do not place greater than 30 feet of tubing on the
exhaust port located on the bottom right of the enclosure.
4. Reinstall the cover to the unit.
Figure 2-1. Diffusion Style Mounting Dimensions
2-4