MSA IR5500 Instruction sheet

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Installation Guidelines—
IR5500 Open Path Gas Detector
qLocation
Factors to consider when selecting locations:
• It is recommended to install the detector on a solid foundation not prone to future ground settling.
• The system should be accessible for occasional response checks.
• The Receiver and Source should be mounted so that the display is visible to aid in alignment.
• Install in low trac areas—the line of sight between the Source and Receiver should be free from obstructions such as:
- Parked vehicles or moveable machinery
- Frequent operator trac or animal crossings
• Although the Source and Receiver are designed to resist radio frequency interferences, they should not be mounted close
to radio sources, near strong magnetic elds or around concentrated sources of heat (i.e. boiler, engine).
• There should be a 3 ft clearance around both the Source and Receiver free from piping, the ground etc.
• Highly reective surfaces can interfere with units placed in close enough proximity.
• Although the IR5500 is FM 6325 approved, which ensures vibration tolerance, it is recommended to mount away from sources
of excessive vibration and away from high voltage/high current power lines.
• Avoid process areas that release vented gas or steam.
wPower & Wiring Requirements
Power Requirements
The IR5500 Open Path Gas Detector is powered
by 24 VDC ± 10% operating.
Cable Requirements
Customers must derive the distance from power supply to device based on cable specications, expected maximum ambient
temperature and cable temperature rise, estimated connection losses, allowances for error in distance measurement, and other
variables particular to the customer installation.
Sample distances from power supply to Source and Receiver:
Terminal Type Push Screw
MAX WIRE SIZE 16 AWG
1.5 mm2
14 AWG
2.5 mm2
TYPICAL RESISTANCE 5.00 ohms/1,000 ft
16.0 ohms/1,000 m
3.00 ohms/1,000 ft
9.00 ohms/1,000 m
SOURCE 625 ft
195 m
1,040 ft
347 m
RECEIVER 800 ft
250 m
1330 ft
444 m
Source Receiver
OPERATING 0.64 A maximum
at 20 VDC input voltage
0.50 A maximum
at 20 VDC input voltage
INRUSH* 1.66 A maximum
at 36 VDC
1.3 A maximum
at 36 VDC
AWG Ohms/1,000 ft Feet Meters
#20 11 4550 1,390
#18 7 7140 2,180
#16 5 10,000 3,050
Electrical Recommendations
INPUT POWER 20–36 VDC range
SOURCE 24 VDC @ 12 W (max.)
RECEIVER W/RELAYS 24 VDC @ 10 W (max.)
Sample distances from Receiver to analog output load:
If the units do not receive adequate power, this can aect unit
performance and have the potential to cause erroneous behavior.
* In-Rush refers to the instantaneous input current drawn by the device when rst turned on
Failure to use shielded cable
or poor earth grounding will result
in poor product performance.

MSAsafety.com/detection
Note: This Bulletin contains only a general
description of the products shown. While uses
and performance capabilities are described,
under no circumstances shall the products be
used by untrained or unqualified individuals
and not until the product instructions
including any warnings or cautions provided
have been thoroughly read and understood.
Only they contain the complete and detailed
information concerning proper
use and care of these products.
Specifications subject to change
without notice.
ID 1465-017-MC / August 2017
© MSA 2017 Printed in U.S.A.
Corporate Headquarters:
MSA – The Safety Company
1000 Cranberry Woods Drive
Cranberry Township, PA 16066
United States
[phone]
[e-mail]
Design Center:
General Monitors
26776 Simpatica Circle
Lake Forest, CA 92630
United States
[phone]
[e-mail]
Additional locations can be found on our web site:
www.MSAsafety.com
eEnvironmental Considerations
• Heaters are installed on the windows to prevent condensation—
the heater is not designed to keep ice o the lenses.
rStart Up & Warm Up Procedure
• After the initial application of power and warm-up, verify that all signal outputs
to and from devices and modules are within specication.
• Initial alignment, alignment checking and testing should be performed.
tAlignment
Once the units are installed, it is important to have proper alignment between the Source and Receiver.
1. Measure the distance between the Source and Receiver. This will be required during alignment.
2. It is recommended that two people are involved in aligning the unit to speed up the process.
One person should be at the Source and one person should be at the Receiver.
Did you know...
MSA has an experienced and
dedicated service team that can
be hired to commission new
installations to ensure optimum
performance of your gas detection
system. Contact us at
[e-mail]
for more information.
Figure 1—Correct Placement Figure 2—Incorrect Placement
For additional guidance on alignment, please refer to the Alignment Guideline document.