Installation Instructions
DS422i and DS426i Dual Beam Photoelectric
Intrusion Detection Systems
Wire Entrance
Response
Adjustment
Power LED
GOOD LEVEL ALARM
POWER
Alignment
Voltage
Jacks
1.0 Specifications
ACTIVE INFRARED SENSOR
ACTIVE INFRARED SENSOR
• Range:
Indoors
Outdoors
Vertical
Fine Tuning
Screw
DS422i
DS426i
300 ft. (90 m)
600 ft. (180 m)
100 ft. (30 m)
200 ft. (60 m)
• Dimensions (HxWxD): 6.75 in. x 3.25 in. x 3.5 in.
Alignment
Tool
171 mm x 82 mm x 87 mm
• Voltage:
• Current:
12 to 28 VDC. Non-Polarized.
Note:
Tool
may be in
any of four
positions
Transmitter
15 mA
Receiver
25 mA
DS422i
DS426i
30 mA
25 mA
Optical Module
Cover Screws
• Standby:
• Relay:
Intended for connection to DC power
supplies capable of supplying power if
primary power fails.
Receiver
Transmitter
Alarm activated Form “C” with dry
contacts rated at 0.5 amps max. @
30 VAC and DC.
Figure A - Location of the system’s major items.
• Place the provided template onto the mounting surface and mark
the holes for its two mounting screws (supplied).
• Tamper:
Normally Closed with cover in place.
NOTE: Be sure all wiring is unpowered before routing.
• Pointability:
The optical module can be adjusted
±90° horizontally or ±24° vertically.
• Route wiring (for wire size see Section 4.0) through the transmitter’s
wire entrance, leaving enough to properly wire the transmitter.
• Temperature:
-13°F to +130°F (-25°C to +55°C).
• Mount the transmitter to the mounting surface. Firmly tighten the
screws.
• Trigger Response Time:50 to 700 milliseconds, selectable.
• Repeat this complete mounting procedure for the receiver. Be sure
to mount the receiver in direct line-of-sight with the transmitter.
2.0 Installation Considerations
• Stay within the listed maximum range.
3.2 Pole Mounting
• Install the system with a clear line-of-sight between the transmitter
and receiver. If installed outdoors, make sure trees, weeds, plants,
etc. will not interfere with the beams.
NOTE: The recommended mounting height is 3 feet (1 m). However,
mounting height will change depending on the anticipated
intruder catch area.
• Use care when installing near reflective surfaces (i.e. glossy walls
or floors). Care should be taken during alignment to ensure beams
are line-of-sight aimed and are not reflecting off surfaces.
NOTE: Use optional MB series poles or equivalent.
• Choose the appropriate mounting location. Install the poles with a
clear line-of-sight between the transmitter and receiver.
• Do not install the units where they may be immersed in water or
subject to corrosive liquids or sprays.
• Remove the transmitter’s cover by loosening the Cover Screw (see
Figure A).
• Do not install the receivers where they will be facing an intense
source of light (e.g. a rising or setting sun). If the sun can not be
avoided, mount the receiver slightly higher than the transmitter. Aim
the receiver down at the transmitter.
• Firmly attach a mounting plate and U-clamp to the pole (see Figure
B) with the screws supplied. Make sure they are line-of-sight aimed
so the transmitter and receiver will be aligned.
• Do not install the receivers where sunlight could be reflected directly
into the receiver optics.
Wiring Entrance
• Do not install either unit on movable surfaces or surfaces subject to
strong vibrations.
3.0 Mounting
U-clamp
3.1 Surface Mounting
NOTE: The recommended mounting height is 3 feet (1 m). However,
mounting height will change depending on the anticipated
intruder catch area.
Figure B - Pole assembly
• Choose the appropriate mounting locations. They should be rigid
and provide a clear line-of-sight between the transmitter and receiver.
• Remove the transmitter’s cover by loosening the cover mounting
screw (see Figure A).
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7.1 Alarm response time
The system’s sensitivity to alarms is manually adjusted by the
RESPONSE TIME Control on the receiver (see Figure L1 and Table
L2).
Receiver's Line-of-Sight
Response Time
Control
3
4
2
-
+
1
5
Transmitted Beam
RESPONSE
TIME
LEVEL
R
ECE
I
VER
Transmitted Beam strength is
strongest along this path
Transmitted Beam weakens
farther from its center
Figure L1 - Response Time Control
RESPONSE
TIME (ms)
RESPONSE
SPEED
CATCH
EXAMPLE
Figure H - Beam Strength Area
• Set the meter to read 3 to 5 VDC.
SETTING
1
2
3
4
5
50±25%
210±25%
380±25%
540±25%
700±25%
23 ft./s (7 m/s)
4 ft./s (1.2 m/s)
2.3 ft./s (0.7 m/s)
1.6 ft./s (0.5 m/s)
1 ft./s (0.3 m/s)
running
jogging
• Fine peak the transmitter. Connect the meter to the receiver’s test
terminals (see Figure J).
3
4
2
quick walk
walking
-
+
1
5
RESPONSE
TIME
LEVEL
R
ECE
IV
ER
slow walk
Table L2 - Response Settings
NOTE: Observe the Polarity
A setting near 1 will alarm if a person runs through the beam while a
setting near 5 will alarm for objects moving very slowly through the
beam. The setting should be adjusted lower where birds, debris,
etc., may interrupt the beam path. Be careful not to adjust the setting
too low, or it will not trigger an alarm.
due to DC voltage.
NOTE: In order to comply with the requirements in UL 639, Intrusion
Detection Units, an object passing through the beams at a
speed of 8.8 feet per second (2.7 m/s) must trigger an alarm.
Figure J - Meter connection
• Rotate the transmitter’s optical module very slightly to the right and
left until a maximum meter reading has been achieved. If you cannot
obtain a reading greater than 2.3 VDC, the Transmitter and Receiver
must be realigned using the procedure in section 5.0.
• Walk through the beams after the desired setting has been chosen.
Be sure the system alarms at the desired pace.
• Walk through the beams in several locations between the units
(see Figure M).
NOTE: To aid in fine-tuning the system, the red LEVEL LED gets
brighter as the units get fine-tuned and the green GOOD
LED will be on when the meter readings reach a peak.
• The system should alarm
during each crossing of the
beam. If not, re-check
alignment or trigger
• Adjust the transmitter’s Vertical Fine Tuning screw slightly until
maximum meter readings have again been achieved.
response time.
• With the transmitter’s optical module fine-tuned, repeat this exact
process with the receiver.
Figure M - Walk testing the
• Replace the covers.
system
NOTE: If a tamper circuit
7.0 Final Check
has been installed, it should be tested now by lifting up the
appropriate covers.
• Completely block the upper beam on the transmitter. Neither the
ALARM LED nor the LEVEL LED should come on. If either does
come on, the beams are incorrectly aligned (see Figure K) and
should be re-aligned.
• Secure the covers by tightening each cover mounting screw.
8.0 Other Information
8.1 Alignment Lights
Alignment may be made easier by using a flashing high intensity
light placed in front of the units. This makes a very distinct target
when looking at the other unit through the viewing port. A
recommended light source is model AL402.
8.2 Maintenance
At least once a year the front covers should be cleaned. Use a clean
cloth and a common window cleaner.
On a daily basis, the end user should walk through the beams before
arming. This will verify operation.
Figure K - Mis-aligned beams
• Completely block the lower beam of the transmitter. Again, neither
the ALARM LED nor the LEVEL LED should come on.
• If necessary, re-align and fine-tune each unit.
DS422i/426i Installation Instructions
© 2004 Bosch Security Systems
Page 3
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9.2 Perimeter Protection
9.0 Application Tips
When protecting the interior of an installation, a good technique is to
mount the units at 90° angles around the coverage area (see Figure
R).
When using photoelectric detectors for motion detection, there are a
few installation techniques that will make the system more versatile.
9.1 Beam Stacking
R4
T2
Beam stacking gives a wall
of protection by stacking
several units at different
T1
R1
R1
T1
heights and providing an
alarm activation on the
blockage of only one pair of
beams (see Figure N for the
correct set-up technique).
Note that the system is
installed with alternating
transmitters and receivers at
each end. This eliminates the
possibility of a receiver being
covered by more than one
transmitter.
S
T2
R2
D
Figure N - Beam stack method
R3
T3
The maximum spacing between receivers (S) can be calculated by
dividing the distance between the transmitter and its receivers (D) by
20.
R2
T4
Figure R- Perimeter protection
Therefore, if the distance between a transmitter and receiver is 100
ft. (30 m), the maximum spacing between receivers would be 100 ft.
(30 m) ÷ 20, or 5 ft. (1.5 m)
Note that the beams are mounted so they cross each other. This way,
an intruder can not enter the area by walking between the units.
When installing multiple transmitters and receivers, test with all the
receivers powered-up, but with only one transmitter powered-up at a
time. A transmitter should set up only its receiver.
S = D/20 S = 100 ft. (30 m)/20 S = 5 ft. (1.5 m)
A potential problem when installing systems in a beam stack is “Near
Field Reflection.” Near field reflection is caused when a reflective
object is placed in the line-of-sight of the detectors and causes the
transmitted signal to be reflected to the wrong receiver (see Figure
P).
Receivers physically too close to a different system’s transmitters
may be set up even if the transmitter is not pointed at them (see
Figure T).
R1
T1
Figure T - Close proximity field problem
If a receiver is being set up by the wrong transmitter, the signals can
usually be eliminated by masking the sides of the transmitter and
receiver. Use electrician’s tape or duct tape inside each enclosure’s
window.
T2
R2
When installing these systems, remember that the infrared signal may
reflect off objects (e.g. glossy walls or floors) in the coverage area and
still set up the receiver.
Figure P - Near field reflection
It may be desirable to have more than two sets of beams to create
taller stacks. This can be accomplished by adding receivers as shown
in Figure Q). Note that the beam from each transmitter is covering
two receivers.
A thorough walk test performed at several different points within the
coverage area will catch this problem. Re-aligning the units should
solve this problem.
The only way to insure proper continual protection is to perform
regular walk tests of the desired coverage area.
T1
R3
R4
R1
R2
T2
Figure Q - Multi-system stack
© 2004 Bosch Security Systems
130 Perinton Parkway, Fairport, New York, USA 14450-9199
Customer Service: (800) 289-0096; Technical Support: (888) 886-6189
03/04
DS422i/DS426i Installation Instructions
P/N: 44974D Page 4
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