Universal Laser Systems ULR 250 Use and care manual

®
ULR 250 Watt/ULCR 500 Watt
OEM CO2 LASER
Integration Manual
Universal Laser Systems, Inc.
16008 North 81st Street
Scottsdale, AZ 85260
Phone: [phone]
Fax: [phone]
September 2016

2
Notice
This publication and its contents are proprietary to Universal Laser Systems, Inc. (ULS), and
are intended solely for the contractual use of ULS, Inc. customers.
While reasonable efforts have been made to assure the accuracy of this manual, ULS shall
not be liable for errors contained herein or for incidental or consequential damage in
connection with the furnishing, performance, or use of this material.
ULS reserves the right to revise this manual and make changes from time to time without
obligation by ULS to notify any person of such revision or changes.
ULS does not assume any liability arising out of the application or use of any products,
circuits, or software described herein. Neither does it convey a license under its patent rights
nor the patent rights of others.
This publication and its contents may not be reproduced, copied, transmitted, or distributed in
any form, or by any means, radio, electronic, mechanical, photocopying, scanning, facsimile,
or otherwise, or for any other purpose, without the prior written permission of ULS.
Intended use of this product must be followed within the guidelines of this manual. In no
event will ULS be liable for any damages caused, in whole or in part, by customer, or for any
economic loss, physical injury, lost revenue, lost profits, lost savings or other indirect,
incidental, special or consequential damages incurred by any person, even if ULS has been
advised of the possibility of such damages or claims.
WARNING: Universal Laser Systems products are not designed, tested, intended or
authorized for use in any medical applications, surgical applications, medical device
manufacturing, or any similar procedure or process requiring approval, testing, or
certification by the United States Food and Drug Administration or other similar
governmental entities.
The product described herein is covered under one or more of U.S. Patents 5,661,746;
5,754,575; 5,867,517; 5,881,087; 5,894,493; 5,901,167; 5,982,803; 6,181,719; 6,983,001;
7,415,051; 7,469,000; 7,715,454; 8,599,898.
© Universal Laser Systems Inc., 2016
All Rights Reserved

3
Contents
NOTICE ................................................................................................................................................................ 2
CONTENTS .......................................................................................................................................................... 3
1.0 INTRODUCTION .......................................................................................................................................... 4
2.0 SPECIFICATIONS ........................................................................................................................................ 5
2.1 250 ULR OEM LASERS ................................................................................................................................ 5
2.2 ULCR 500 OEM COMBO LASERS ................................................................................................................ 7
3.0 SAFETY ISSUES............................................................................................................................................ 9
3.1 LASER SAFETY.............................................................................................................................................. 9
3.2 ELECTRICAL SAFETY .................................................................................................................................... 9
3.3 ELECTROMAGNETIC INTERFERENCE ........................................................................................................... 10
3.4 CONTACTS FOR SAFETY INFORMATION....................................................................................................... 10
4.0 A BRIEF DESCRIPTION OF THE LASER ............................................................................................. 11
4.1 ULR OEM LASERS ..................................................................................................................................... 11
4.2 ULCR OEM COMBO LASERS ..................................................................................................................... 11
5.0 OEM LASER INSTALLATION AND OPERATION .............................................................................. 12
5.1 LASER MOUNTING ...................................................................................................................................... 12
5.2 POWER REQUIREMENTS AND CONNECTIONS............................................................................................... 12
5.3 COMMUNICATIONS CONNECTIONS, ULR/ULCR LASERS ........................................................................... 13
5.4 INTERLOCK CIRCUIT ................................................................................................................................... 15
5.5 LASER MODULATION .................................................................................................................................. 15
5.6 LASER OPERATIONAL SIGNALS................................................................................................................... 17
6.0 AIR COOLING ............................................................................................................................................ 18
6.1 PROPER AIRFLOW ........................................................................................................................................ 18
6.2 AMBIENT TEMPERATURE ............................................................................................................................ 18
7.0 LASER TROUBLESHOOTING GUIDE, ULR LASERS ........................................................................ 19
8.0 SHIPPING LASERS BACK FOR REPAIR OR REFILL ....................................................................... 21
9.0 RECYCLING ................................................................................................................................................ 21
APPENDIX A: ULR250/ULCR500 (UL-10 RF POWER SUPPLY) LASER SERIAL
COMMUNICATIONS PROTOCOL ............................................................................................................... 22

4
1.0 Introduction
Thank you for choosing a Universal Laser Systems CO2 laser for your application. ULS is
committed to providing the marketplace with low cost CO2 lasers, which take advantage of
our patented technology to provide compact size, ease of integration and high performance.
This integration manual will guide you through the process of integrating a ULS laser into
your equipment and provide you with the information you need to operate the laser. Please
read this entire manual and familiarize yourself with its contents. If you need help please feel
free to call Universal Laser Systems and we will be happy to provide you with assistance.

5
2.0 Specifications
2.1 250 ULR OEM Lasers
Specifications for all 250 ULR OEM CO2 Lasers are summarized below.
Parameter
*
Model
ULR
-
2
50
Rated Pow
er
**
2
5
0
Watts
Wavelength
10.6 m
Power Stability
 5% after 15 minutes of CW operation
M
2
1.2  .1
Beam Size (Near Field)****
8 1 mm
Beam Divergence (Full Angle)
4  1 mr
Polarization
Linear (See Figure 1 for orientation)
Pointing Stability
200 R
Optical Pulse Rise or Fall Time
120  40 S
Duty Cycle
0
-
100%
Modulation Signal Type
5 volt logic
Cooling
Integrated
Air
Weight (
Integrated
Air
-
Cooled)
100 Lb. [45
kg]
Environmental
Ambient Temperature
***
50-95 F [10-35 C]
Relative Humidity
<
90% (non
-
condensing)
Power Requirements
DC Input Voltage
48.0 VDC
RMS Current (CW, including fan)
8
0 A
Inrush Current
1
50 A
* The above specifications are subject to change without notice.
** Output power is guaranteed to exceed this level for the duration of the warranty,
regardless of run-time.
*** At temperatures below 50 F [10 C] operation may be intermittent and there is a
potential for damage to the power supply and optics.
**** Near field is approximately 150mm from output-coupler.

6
Figure 1 – Dimensional Specifications – ULR-250

7
2.2 ULCR 500 OEM Combo Lasers
Specifications for all 500 ULCR OEM CO2 Combo Lasers are summarized below.
Parameter
*
Model
ULCR
-
5
00
Rated Power
**
5
00
W
atts
Wavelength
10.6 m
Power Stability
 5% after 15 minutes of CW operation
M
2
1.2  .1
Beam Size (Near Field)****
8 1 mm
Beam Divergence (Full Angle)
4  1 mr
Polarization
Cross Polarized
Pointing Stability
200 R
Optical Pulse Rise or Fall Time
140  40 S
Optical Modulation
0
-
100%
Modulation Sig
nal Type
5 volt logic
Cooling
Integrated Air
Weight (
Integrated
Air
-
Cooled)
200
Lb. [
90.4
kg]
Environmental
Ambient Temperature
***
50-95 F [10-35 C]
Relative Humidity
< 90% (non
-
condensing)
Power Requirements
DC Input Voltage
48.0 VDC
RMS Curre
nt (CW, including fan)
1
6
0 A
Inrush Current
300
A
* The above specifications are subject to change without notice.
** Output power is guaranteed to exceed this level for the duration of the warranty,
regardless of run-time.
*** At temperatures below 50 F [10 C] operation may be intermittent and there is a
potential for damage to the power supply and optics.
**** Near field is approximately 150mm from output-window.

8
Figure 2 – Dimensional Specifications – ULCR-500

9
3.0 Safety Issues
3.1 Laser Safety
ULS OEM lasers are sold as components and therefore are not required to conform to U.S. or
European safety regulations. It is the responsibility of the buyer to design and certify any
equipment incorporating a ULS OEM laser to meet all local safety regulations prior to sale to
the public. The texts of these regulations are available from the respective governing bodies
of the countries the equipment is to be sold into.
Any personnel working with or around open lasers must be aware of the following:
 Exposure to the laser beam may cause physical burns and can cause severe eye
damage. Proper eye protection should be used at all times. All eye protection should
be appropriate for the radiation wavelength generated by the laser in use.
 Exposure to the laser beam may cause ignition of volatile or combustible
materials. Do not use lasers in the presence of these types of materials.
 Never look directly into the laser output port.
 Interlock all rooms in which open beams may be present and post appropriate
warnings on or near the doors. Access to these rooms should be limited to properly
trained technicians when lasers are in use.
 Use appropriate protective coverings over all beam paths whenever possible.
 Lasers and optical elements should be positioned to keep the beam and
reflections below eye level.
Notice: For more information on EMI standards, refer to local EMI safety regulations.
3.2 Electrical Safety
ULS lasers operate at 48 VDC, which is below the voltage limit that is considered dangerous
by most safety standards. However, the lasers draw large amounts of current and the power
supplies needed to provide the 48 VDC usually require 90-240 VAC to operate. For these
reasons, proper safety precautions should be taken with every portion of the electrical
system.
Notice: For more information on EMI standards, refer to local EMI safety regulations.

10
3.3 Electromagnetic Interference
ULS OEM lasers are sold as components and therefore are not required to conform to all
U.S. or European safety regulations regarding EMI. It is the responsibility of the customer to
design and certify any equipment incorporating a ULS OEM laser to meet all local safety
regulations prior to sale to the public. However, testing by ULS has demonstrated that with a
properly selected power supply and line filtering all ULS OEM lasers will pass the relevant
U.S. and European EMI standards for Class A equipment. See Section 5.3 for more
information.
Notice: For more information on EMI standards, refer to local EMI safety regulations.
3.4 Contacts for Safety Information
It is the responsibility of the integrator to meet all applicable safety standards required
by the authorities of the region that the unit will be operating in. Below is a list of useful
contacts for information on safety regulations in the U.S. Canada, and Europe:
United States
Food and Drug Administration - Center for Devices and
Radiological Health (CDRH), 1-800-638-2041.
Federal Communications Commission (FCC), (301)362-
3000.
Underwriters Laboratories Inc. (UL), Illinois (708)272-
8800, New York [phone], California
[phone].
Laser Safety Institute of America, [phone].
Occupational Safety and Health Administration, (202)693-
2300.
Canada
Canadian Standards Association (CSA), [phone].
Europe
European Committee for Electrotechnical Standardization
(Cenelec), rue de Stassart 35, B-1050 Brussels
International Organization for Standardization (ISO), 1 rue
de Varembé, Case postale 56, CH-1211 Genève 20
Switzerland

11
4.0 A Brief Description of the Laser
4.1 ULR OEM Lasers
The ULR-250/ULCR-500 OEM CO2 gas lasers use a sealed, RF excited, slab design
incorporating an unstable resonator. Each laser consists of a plasma tube, with mirrors at
each end forming an optical resonator, and an integrated RF power supply incorporated into
the laser chassis which includes an integrated cooling fan. Convenient mounting provisions
are provided in the laser-baseplate.
The plasma tube consists of two opposing electrodes in a slab configuration meaning the
cross-section of the gap between the electrodes is rectangular instead of square. This allows
for an unstable resonator using the full width of the rectangular electrode gap to produce the
required laser power output. The advantage of this is a powerful laser beam from a relatively
compact package.
The unstable optical resonator is formed by a system of two mirrors, one in the back and one
in the front. The curvature of the rear mirror is such that some laser energy from the
resonator leaks past the front mirror forming the external laser beam. A window located to
the side of the front mirror allows the laser beam from the unstable resonator to exit the tube.
Each electrode is attached to the RF power supply through a matching network that allows
the impedance of the tube to be tuned to match the impedance of the RF power supply. The
RF power supply operates at approximately 40 MHz. Power control of the laser output is
provided through pulse width modulation of the RF by an external 5 volt logic signal
provided by the user.
4.2 ULCR OEM Combo Lasers
The ULCR-500 OEM CO2 gas laser takes advantage of the linear polarization of the laser
beams from two standard ULR-250 lasers to optically combine the beams. The two lasers are
mounted together in a rigid housing and optically aligned so that the beams are collinear
creating a new laser product with double the power output of our standard single tube lasers.
To combine the beams, the polarization vector of one laser is rotated ninety degrees to that of
the other and then both beams are directed through a combining element. This results in a
highly symmetric combined beam that is cross polarized. The combo lasers include
integrated fans for air cooling.

12
5.0 OEM Laser Installation and Operation
5.1 Laser Mounting
There are threaded holes used for mounting located in the mounting pads in the bottom of the
both the ULR-250 and ULCR-500 OEM lasers, as shown in the figures in Section 2. The
laser can be mounted in any orientation including vertical. The ULR-250 watt laser has one
fixed mounting pad and one floating mounting pad that accommodates thermal expansion
during operation without binding and warping. The ULCR-500 watt laser has an intermediate
plate mounted to the mounting pads of the two ULR-250 laser tubes that make up the
optically combined laser. Mounting surfaces for both ULR-250 and ULCR -500 watt lasers
should be flat to within 0.02” (0.5 mm) between mounting points. ULR-250 and ULCR-500
lasers will expand a maximum of .040in (1.0 mm) over the thermal operating range of the
lasers. Provision should be made to allow for this expansion when designing these lasers into
laser systems.
5.2 Power Requirements and Connections
A good quality 48 volt DC power supply should be used to power the laser. Nominal output
should not exceed 48 volts and regulation should be within .5% under 100% load. The power
supply should have good transient response characteristics to handle the fluctuating current
requirements caused by modulation of the laser. Careful attention should be paid to power
entry filtering when designing to meet Class A conducted EMI regulations. In order to meet
Class A emitted EMI regulations, it is important that the 48 volt power wires be no more than
3 feet (1 meter) in length and that the 48 volt power supply and laser chassis be attached to a
common earth ground through very low induction connections.
48 volt power connections are made through a dedicated 48 volt connector (2 connectors for
ULCR-500 lasers) and a grounding screw (provided). A matting connector is supplied for the
48 volt connection and wire can be crimped or soldered to the connector. A 0.25” (M6) ring
terminal is needed for the grounding screw.
Recommended wire gauges are as follows:
MODEL WIRE SIZE
ULR-250 6 AWG
ULCR-500 6 AWG x 2
NOTE: When connecting +48V the power plug, insert until a click is heard. If inserted
properly, the user should not be able to pull the plug out. To remove the plug, the user must
push the plug further into the receptacle, then pull it out.

13
5.3 Communications Connections, ULR/ULCR Lasers
All communication connections for the laser are made through one 12-pin communications
connector located on the back of the laser. The mating connector will accommodate up 22
AWG [0.33 mm2] wire. Figure 3 details the connector pin diagram. Figure 4 details the
signals for each pin. All input, output, interlock, and RS485 communications are fully
optically isolated and are all referenced to the same shared “GNDIO” signal. (Signals and
“GNDIO” are not connected to DC power supply GND, nor are they connected to chassis.)
Figure 3 – Laser Connector Pin Diagram
Pin Number
Input Name
Laser Input/Output
Wire Size
Description
1 RS485_D+ Optically isolated I/O,
Half Duplex
2
4
-
28
AWG
[0.20 –
0.081mm2]
Optically isolated RS485+
data
line, referenced to “GNDIO.”
Half- duplex communication
port. Use twisted-pair with pin 2.
2 RS485_D- Optically isolated I/O,
Half Duplex
2
4
-
28
AWG
[0.20 –
0.081mm2]
Optically isolated RS485
-
data
line, referenced to “GNDIO.”
Half- duplex communication
port. Use twisted-pair with pin 1.
3 Modulation
Input Optically isolated input
24-28
AWG
[0.20 –
0.081mm2]
HIGH signal (2.4V to 5V)
between pin 3 & 4 will
continuously fire the CO2 laser
when interlock is also closed.
LOW signal is < 0.4V
Recommend twisted-pair with
pin 4.
Laser power control is achieved
by PWM control on this pin.
4 GNDIO Optically isolated return
signal “GNDIO”
2
4
-
28
AWG
[0.20 –
0.081mm2]
Optically isolated return signal
intended for “Modulation Input”
(pin 3).
See note 1

14
5 Laser Diode
Pointer Input Optically isolated input
24-28
AWG
[0.20 –
0.081mm2]
HIGH signal (2.4V to 5V)
between pin 5 & 6 will turn on
the red laser pointer (if ordered
with pointer option).
LOW signal is < 0.4V
6 GNDIO Optically isolated return
signal “GNDIO”
2
4
-
28
AWG
[0.20 –
0.081mm2]
Optically isolated return signal
intended for “Laser Diode
Pointer Input” (pin 5).
See note 1
7 Interlock12V
Source
Isolated 12 volt source
(only use for interlock)
24-28
AWG
[0.20 –
0.081mm2]
Connect safety switches
between pins 7 and 8 to enable
laser. Do not use this pin as a
power source for other
purposes. 50mA max source for
interlock loop. GND reference
of this supply is tied to GNDIO.
See Note 2
8 Interlock Input
Optically isolated
Interlock Input (12V
signal level)
24-28
AWG
[0.20 –
0.081mm2]
See description for Pin
7
. User
may connect safety switches
between pins 7 & 8; or
alternatively, user may supply
external +12V through safety
switches to pin 8, and connect
user power supply GND to
“GNDIO”
Pin 8 is referenced internally
to “GNDIO”
9 OC Status Out
Open-Collector
Optoisolator Output
from laser.
24-28
AWG
[0.20 –
0.081mm2]
Open
-
Collector Open = Fault
Open-Collector Closed =
Normal
(Unplugged, unpowered laser,
or laser fault will all appear as
OPEN)
See note 3,4
10
OC
Temperature
Warning
Open-Collector
Optoisolator Output
from laser.
2
4
-
28
AWG
[0.20 –
0.081mm2]
Open-Collector Open = Normal
Open-Collector Closed = Fault
See note 3,4

15
11 N/C No internal connection
12 N/C No internal connection
Notes:
1. Pins 4 & 6 are internally connected to “GNDIO”. The “GNDIO” signal should be
connected on the driving electronics side. This shared signal is used as the return
signal for all I/O. The “GNDIO” signal is optically isolated and NOT connected to
the laser’s chassis or DC GND.
2. 50mA is available for the interlock and key circuits. This current is shared between
the two circuits and it is not recommended that external loads be placed inline that
would reduce this voltage below 10V.
3. When closed, MOCD207M open-collector output will conduct up to 8mA through 330 ohm
series resistor to GNDIO. We recommend operating Open-Collector at 1mA or less to minimize
Vce on MOCD207 phototransistor, so logic “low” will be closer to 0.4V. (Recommend 4.3K
external pullup for 5V logic, or 3K external pullup for 3.3V logic)
4. We recommend not using these pins to reduce wire harness complexity, and instead poll this
information over RS485.
Figure 4 – Laser Interconnect Schematic
5.4 Interlock Circuit
An interlock circuit is incorporated into the laser, which can be combined with external
switches to satisfy safety requirements when designing Class 1 laser equipment. At least two
redundant switches must be used for each panel providing access to a Class 1 enclosure.
Please refer to the appropriate safety regulations for more information on Class 1 laser
equipment design.
The interlock circuit is self-sourced using a 12 volt output supplied by the laser. The
interlock is closed by connecting the “Interlock 12V Source” pin to the “Interlock input”.
This allows the laser to operate. Any break in this connection will cause the laser to stop
operating. Switches can be placed in series with these pins to create a safety interlock circuit.
5.5 Laser Modulation
A 5 volt logic compatible signal must be provided to the “Modulation Input” pin to drive the
laser (with “GNDIO” being the return). Average laser output power can be controlled from 0
to 100% (CW Mode) by pulse width modulation of the input signal.
As with all CO2 lasers, delays are inherent in the response of the laser beam output to the
input signal. A typical laser will have response characteristics similar to those detailed in the

16
oscilloscope traces in figures 5 and 6 below. These figures show a 5 volt logic signal and
corresponding laser power output.
Figure 5 – Oscilloscope trace of typical rise time for a laser
Figure 6 – Oscilloscope trace of typical fall time for a laser

17
5.6 Laser Operational Signals
A "laser status" signal is provided on pin 9 for diagnostic purposes (pin 11 is the return).
During a fault, the laser will not operate. Possible detected faults include: Interlock circuit
open; Over-temperature; Under-temperature; Failure in the internal power circuit. We
recommend not using this pin to save wire harness complexity, and instead poll results over
RS485.
A "temperature warning" signal is also provided on pin 10 (pin 11 is the return). When tube
temperature approaches over-temperature or approaches under-temperature, this signal will
be asserted, but the laser will continue to operate unless tube temperature exceeds the over or
under temperature limit. We recommend not using this pin to save wire harness complexity,
and instead poll results over RS485.
Connections for both laser status and temperature warning must be made according to Fig 4
and Fig 4 notes.
This laser is also equipped with RS-485 communications for control and diagnostic purposes.
Please refer to Appendix A Communication Protocol.

18
6.0 Air Cooling
6.1 Proper airflow
Careful attention should be paid to proper airflow through the laser when integrating it into
equipment. Any restriction of airflow will result in reduced power output and can cause
permanent power loss or failure over extended periods of time. Ambient air should be
directed to the laser’s intake vents on the front end of the laser, and exhaust air from the back
end of the laser should be directed out of equipment with as little restriction as possible. If
the laser is placed in an enclosure it may be necessary to provide additional fans to draw
exhaust air out of the enclosure to reduce a rise in temperature inside the enclosure, which
can affect laser output power. A general guideline to determine adequate airflow is shown in
the following table. If exhaust air temperatures are significantly above those listed, that is an
indication of inadequate air flow.
LASER MODEL EXHAUST AIRTEMPERATURE
ULR-250 < 50 ºC
ULR-500 < 50 ºC
Finally, ambient air should be filtered before entering the laser to prevent a build up of dust
and debris on the cooling fins which can reduce cooling efficiency, however, care should be
taken when selecting a filter media to ensure that the filter does not restrict air flow. For
relatively clean environments a low restriction filter media (45 pores per inch for example)
might be adequate but for dirtier environments a heavier filter media might be required.
6.2 Ambient temperature
Air cooled lasers by nature are sensitive to ambient temperatures. Hotter ambient
temperatures will reduce power output and cooler ambient temperatures will increase power
output. An ambient temperature range of 50-95 F [10-35C] should be observed to
guarantee proper laser operation. At temperatures below 50 F [10 C] operation may be
intermittent and there is a potential for damage to the power supply and optics. At
temperatures above 95 F [35 C] ULS lasers are not guaranteed to provide the rated power
output. Lasers can safely be operated at ambient temperatures above 95 F [35 C] however
power output will diminish as ambient temperature rises and longevity can be significantly
reduced.

19
7.0 Laser Troubleshooting Guide, ULR Lasers
(Rev 1.0 October 19th, 2006)
Use the following chart to troubleshoot the laser
SYMPTOM PROBABLE CAUSE
1. Laser emission LED does not turn on a. Check the following:
i. Power is turned on to the laser
ii. Interlocks are closed
If all of the above items are correct and the
emission light still does not turn on then go to
step (b)
b. Measure the signal voltage on “LASER
STATUS OUT” pin(s) with respect to Chassis
/ DC power supply return.:
i. If it reads 4.5V or greater then call the
factory. Either the emission ready
LED has malfunctioned or the RF
electronics has malfunctioned. Please
call the factory for further trouble
shooting guidance.
ii. If it reads lower than 1V then go to
step (c).
c. Measure the signal voltage
on”TEMPERATURE WARNING” pin with
respect to Chassis / DC power supply return.:
i. If it reads 4.5V or greater then call the
factory for further trouble shooting
guidance.
If it reads lower than 1V then the laser has
encountered a temperature error. When
the laser encounters a temperature error it
will normally reset it self when its
temperature falls within the operating
limits. The laser can be brought to within
its operating limits if the ambient
temperature is held between 15 Celsius
and 45 Celsius. If the laser has been at the
rated ambient temperature for an hour and

20
if the emission LED does not turn on go to
step call the factory.
2. Laser emission LED is on but the
laser does not fire
a. Check if your modulation signal is
connected to MODULATION(+) pin(s) and
the signal return is connected to
MODULATION(-) pin(s).
i. If your connections are correct then go
to step (b).
b. Disconnect the interlocks.
i. Is the emission LED on? If it is then
you have a shorted Power FET. Please
call the factory to rectify your
situation.
ii. Else go to step (c).
c. The laser’s control electronics is emission
ready, but it may or may not be gating the
modulation signal through to the laser.
i. Please call the factory for resolving
your problem.
3. Fan does not turn on a. Check the following:
i. Power is turned on to the laser
ii. Voltage supplied is 48V +/-.5V.
If this does not resolve your problem call the
factory.
4. The laser stopped emitting even
though the modulation signal is on
a. Is the emission LED on?
i. If it is off, then the laser detected a
fault.
ii. Else go to step (b)
b. If the emission LED is on then the laser’s
control electronics is emission ready and the
problem may lie in the modulation gating
signal section. Please call the factory for
further advice.