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6.3
APERTURE KIT FOR SHORT RANGE
APPLICATIONS
The Short Range Aperture Kit enables
successful application of the LS2000 gas
detector at short separation distances (5–15
meters for the short range model and 30–40
meters for the long range model). The aperture
is made of aluminum and is included with the
LS2000 transmitter.
Procedure for System Commissioning
Using the Aperture
1. Align the LS2000 system using the Basic
Alignment procedure. At the completion
of this alignment, the output signal at the
receiver may indicate a fault condition
as a result of signal saturation. (See the
“Gain Level Check” section for additional
information on signal strength checks.)
2. Attach the aperture to the front of the LS2000
transmitter
module using the captive screws
provided. For best weather protection, the
aperture hole should be located at the top of
the unit.
3. Perform a zero calibration. After performing the
zero calibration, the receiver module should
display a normal condition (green LED) and a
steady 4 mA output.
NOTE
If the receiver continues to indicate a fault
condition as a result of signal saturation,
rotate the aperture 90 degrees and repeat
step 3 above.
RECOMMENDATIONS FOR USING THE
HART FIELD COMMUNICATOR
WARNING
The LS2000 does not use Intrinsically
Safe circuitry for connection to the HART
475 Communicator. Connecting a HART
475 Communicator to the LS2000 may
invalidate the Intrinsic Safety circuits of the
HART 475 Communicator.
• The HART communication device must
include the LS2000 device descriptor
(DD) software menu. The use of HART
communication devices without the proper
DDs may establish generic mode HART
communication, but will not enable proper
operation with LS2000. Refer to the HART
Appendix for additional information.
• A minimum level of understanding with regard
to the operation and navigation of the HART
communicator is required. Please refer to the
appropriate HART communicator instruction
manual for basic operating instructions if
required. Additional information on the use of
the HART communicator is provided within the
HART Appendix in this document.
• For proper HART communication to occur, it is
required that a 250-500 ohm resistive load be
present in the LS2000 analog 4–20 mA signal
loop output. See “Wiring Procedure” in the
“Installation” section.
Table 7—Typical System Response in LFL-M (% Full Scale) Using Gas Test Films
Number of
Test Films
Methane
Propane
Butane
Calibration Gas Concentration
ISO
IEC
ISO
IEC
ISO
IEC
1
0.6
(13%)
0.7
(15%)
1.2
(25%)
1.4
(28%)
1.1
(23%)
1.4
(28%)
2
1.5
(29%)
1.7
(34%)
2.6
(51%)
3.0
(60%)
2.3
(47%)
3.0
(60%)
3
2.5
(50%)
3.0
(60%)
3.9
(79%)
4.7
(94%)
3.6
(72%)
4.7
(94%)
4
3.7
(74%)
4.6
(91%)
5.4
(108%)
6.0
(120%)
4.9
(98%)
6.0
(120%)
5
5.0
(100%)
5.9
(119%)
6.0
(120%)
6.0
(120%)
6.0
(120%)
6.0
(120%)
Notes:
1
A HART handheld device is needed to read over-range values
2
Accuracy of Test Films = +/- 15% LFL-M