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15. Re-check the alignment one final time using
the alignment tool and adjust as needed.
16. Remove the Alignment Tool and re-install the
brow.
17. Bypass all external gas alarm devices that
are connected to the receiver outputs, and
then apply 24 Vdc power to the modules.
18.
Upon completion of warm-up mode
(approximately two minutes or less), the receiver
should produce a 4 mA output signal and a
green LED indication. If not, the required zero
calibration step below may resolve this issue.
19. For installations with module separation
distances between 5 and 40 meters, install
the aperture as described in the “Aperture Kit
for Short Range Applications” section.
20.Perform a zero calibration. (Refer to “Zero
Calibration” in the “Calibration” section of this
manual.) Any faults that may be present as
a result of the alignment process should be
cleared.
NOTE
The LS2000 transmitter lamp output intensity
is automatically optimized during the zero
calibration process if the communication link
wires are attached between transmitter and
receiver. If no communication link is installed,
the transmitter lamp output can be adjusted
via Modbus or HART connection to the
transmitter. This adjustment is rarely needed.
(See “Transmitter Lamp Voltage” section for
more information.)
21. Proper operation should be confirmed by
bypassing all system alarms, then placing
an optical test film (sold separately) into the
light beam and checking for the appropriate
4–20 mA output level or relay actuation.
The LS2000 test film packet consists of five
separate test films.
Table 7 shows the response of the different
LS2000 gas settings to each of the five
test films for ISO and IEC calibration gas
concentrations. Products with “A” and “B”
type approvals are factory calibrated to
ISO gas concentrations. Products with “E”
approval are factory calibrated to IEC gas
concentrations. Alarm conditions, if present,
should clear when the test film is removed
from the beam. See LS2000 Model Matrix
(Pg. 36) for Type approvals.
22. Confirm proper operation by completely
blocking the light beam with a solid object
such as a piece of cardboard until a beam
block fault is signaled by the appropriate
4-20 mA output level or relay action (default
delay is 60 seconds). The fault should clear
when the blocking device is removed from
the beam.
23. When Basic Alignment and Zero Calibration
have been successfully completed, a green
LED should be displayed on the receiver
module and the analog signal output level
should be 4.0 milliamperes.
POSITION A = ORIGINAL ALIGNMENT
POSITION B = CROSS HAIR POSITION AFTER ROTATING SCOPE 180°
POSITION C = MIDWAY BETWEEN POSITION A AND B
STEP 1: CENTER CROSS HAIRS ON TARGET USING
ADJUSTMENT BOLTS ON MOUNTING PLATE
(POSITION A).
STEP 2: ROTATE SCOPE 180°. ALIGNMENT
ERROR CAUSES CROSS HAIRS TO
MOVE TO POSITION B.
STEP 3: ADJUST ALIGNMENT SCREWS ON SCOPE
TO PLACE CROSS HAIRS AT POSITION C.
STEP 4: ROTATE SCOPE 180° TO ORIGINAL POSITION.
STEP 5: REPEAT STEPS 1 TO 4 UNTIL THE UNIT IS
CORRECTLY ALIGNED.
A2314
Figure 27—LS2000 Alignment Using the Telescope Alignment Tool