Bosch Power Tools DS240, DS241 specifications Preliminary Alignment, Sensitivity Adjustment

-If the LED is off, check for the presence of power and proper polarity on Terminals 1 (–) & 2 (+).

-A steady green LED indicates a faulty transmitter, and the unit should be returned to the factory.

•Check the three receiver LEDs (see Figure 9).

	Trouble/Yellow
Red/Alarm	Green/Normal

Figure 9 - Receiver's LEDs

-It is normal for all of them to be on at this time, with the green indicator either flashing or constantly on.

-If all are off, check for the presence of power and proper polarity on Terminals 8 (–) & 9 (+).

•Mount an AL240 strobe aiming light or equivalent (such as a Faraday 5508) as close to the receiver as possible (preferably on top of the receiver).

-Point it at the transmitter as your guide for aiming (an aiming light may not be necessary for short distance separations).

7.1 Preliminary Alignment

Each optical module is equipped with two alignment mirrors (one on each side) for initial alignment (see Figure 10).

FRONT VIEW SIDE VIEW

HORIZONTAL

FINE TUNE

VERTICAL

FINE TUNE

	FRONT BORE SIGHT
ALIGNMENT		ALIGNMENT
		MIRROR
MIRRORS	REAR BORE SIGHTS

Figure 10 - The Optical Module

To initially align an optical module, look into either mirror from a side angle at least 2 ft (61 cm) from the module. The optical module is pointed at objects seen in the mirror when the orange colored front bore sight is in the center of the rear bore sights (see Figure 11).

Front Bore Sight

Rear Bore Sights

Figure 11 - View of the Alignment Mirror

with Bore Sights Aligned Properly.

HINT: Use alignment sights like aiming a gun.

•Rotate the transmitter's optical module left or right until the image of the aiming light (or receiver image, if aiming light is not used) can be seen in the mirror.

-If initially aimed too high or low, adjust the Vertical Fine Tuning adjustment allen screw (with supplied allen wrench) slightly up or down until the image is found.

•Use the Vertical Fine Tuning adjustment screw and the Horizontal Fine Tuning adjustment screw to fine tune the image to the center of the mirror (in-line with the front and rear bore sights).

•Replace and secure the transmitter's cover when this alignment procedure is complete.

•Check the transmitter's green LED. It should be flashing.

•Replace and secure the transmitter's access door.

•Align the receiver to the image of the transmitter using the above preliminary alignment procedure.

•Check the receiver's green LED. It should be flashing. This indicates that the preliminary alignment is complete.

- If the receiver’s green LED is not flashing, repeat the prelimi- nary alignment procedure for the receiver.

7.2 Sensitivity Adjustment

Use the chart below (Figure 12) to aid in the sensitivity adjustment.

Recommended Settings

Switch	Sensitivity	Alarm	Beam Length
Setting		Response
0	30%	5 sec	30-100 ft (9-31 m)
1	60%	5 sec	100-350 ft. 31-107 m)
2	20%	30 sec	30-50 ft (9 -15 m)
3	30%	30 sec	45-75 ft. 14-23 m)
4	40%	30 sec	70-100 ft (21-31 m)
5	50%	30 sec	90-140 ft. 27-43 m)
6	60%	30 sec	120-180 ft (37-55 m)
7	70%	30 sec	160-350 ft (49-107 m)

Figure 12 - Recommended Settings Chart

NOTE: Positions 8 and 9 are not valid positions. They are not to be used.

•Select the appropriate sensitivity setting from the above chart based on the distance between the transmitter and receiver.

•Set the receiver’s Sensitivity switch at this setting.

•The Sensitivity switch is located just to the right of the optical module on the receiver. The indicator or pointer marking runs along the side of the switches' shaft (seeFigure 13).

0

Figure 13 - Sensitivity Switch

•The recommended settings chart lists distances with some settings that overlap. For more sensitive detection, select the lower number setting. For better immunity to false alarms, select the higher number setting.

DS240/DS241 Installation Instructions © 2004 Bosch P/N: 22066P Page 5