Bosch Appliances DS422I Final Check, Alarm response time, Other Information Alignment Lights

Receiver's Line-of-Sight

Transmitted Beam

Transmitted Beam strength is

strongest along this path Transmitted Beam weakens farther from its center

Figure H - Beam Strength Area

•Set the meter to read 3 to 5 VDC.

•Fine peak the transmitter. Connect the meter to the receiver’s test

terminals (see Figure J).

	3
2	4

+ -	5
1
LEVEL	RESPONSE
	TIME

RECEIVER

NOTE: Observe the Polarity due to DC voltage.

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.

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.

•Adjust the transmitter’s Vertical Fine Tuning screw slightly until maximum meter readings have again been achieved.

•With the transmitter’s optical module fine-tuned, repeat this exact process with the receiver.

7.0 Final Check

•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.

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.

7.1Alarm 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).

Response Time
Control	3
2	4
+ -	5
1

LEVEL	RESPONSE
	TIME
RECEIVER

Figure L1 - Response Time Control

SETTING	RESPONSE	RESPONSE	CATCH
	TIME (ms)	SPEED	EXAMPLE
1	50±25%	23 ft./s (7 m/s)	running
2	210±25%	4 ft./s (1.2 m/s)	jogging
3	380±25%	2.3 ft./s (0.7 m/s)	quick walk
4	540±25%	1.6 ft./s (0.5 m/s)	walking
5	700±25%	1 ft./s (0.3 m/s)	slow walk

Table L2 - Response Settings

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.

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.

•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).

•The system should alarm

during each crossing of the beam. If not, re-check alignment or trigger

response time.	Figure M - Walk testing the
• Replace the covers.	system

NOTE: If a tamper circuit

has been installed, it should be tested now by lifting up the appropriate covers.

• Secure the covers by tightening each cover mounting screw.

8.0Other Information

8.1Alignment 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.

DS422i/426i Installation Instructions © 2004 Bosch Security Systems Page 3