Sigma AM-255 User Manual
ALARM MONITOR
MODEL AM-255
OPERATING AND SERVICE MANUAL
Version 1.01z
December 20,2004
AM-255
TABLE OF CONTENTS
1. INTRODUCTION.....................................................................................................................1
1.1. SCOPE AND PURPOSE OF MANUAL....................................................................1
1.2. GENERAL DESCRIPTION.......................................................................................1
1.3. SAFETY PRECAUTIONS.........................................................................................1
1.4. SPECIFICATIONS.....................................................................................................2
2. INSPECTION AND SETUP ....................................................................................................3
2.1. INSPECTION..............................................................................................................3
2.2. SET-UP PROCEDURES ............................................................................................4
2.3. WIRING INSTRUCTIONS........................................................................................5
2.4. INITIAL SETUP CHECKLIST..................................................................................8
3. OPERATING INSTRUCTIONS.............................................................................................9
3.1. CONTROLS AND INDICATORS.............................................................................9
3.2. SUMMARY OF ALARM INDICATIONS..............................................................10
3.3. OPERATION............................................................................................................11
4. THEORY OF OPERATION..................................................................................................12
4.1. UNIT OPERATION..................................................................................................12
4.2. COMPONENTS........................................................................................................ 13
5. MAINTENANCE....................................................................................................................14
5.1. MAINTENANCE PROCEDURES ..........................................................................14
5.2. PERFORMANCE VERIFICATION CHECKLIST .................................................15
6. TROUBLESHOOTING .........................................................................................................16
6.1. COMPONENT ACCESS..........................................................................................16
6.2. TROUBLESHOOTING GUIDE ..............................................................................17
6.3. TROUBLESHOOTING............................................................................................18
APPENDIX..................................................................................................................................19
A. WARRANTY..........................................................................................................................19
B. GLOSSARY............................................................................................................................20
C. FORMULAS...........................................................................................................................22
C.1. ACTIVITY FROM COUNTS..................................................................................22
C.2. EFFICIENCY...........................................................................................................22
C.3. N*SIGMA ALARM LEVEL ...................................................................................22
C.4. RELIABLE DETECTABLE ACTIVITY (RDA) FORMULA................................23
C.5. SIGNAL TO BACKGROUND RATIO...................................................................23
C.6. VARIANCE..............................................................................................................24
D. CONFIGURATION TRACKING SHEET..........................................................................25
E. PARTS.....................................................................................................................................26
E.1. RECOMMENDED SPARE PARTS........................................................................26
E.2. SPARE PARTS ORDERING INFORMATION......................................................26
F. DRAWINGS............................................................................................................................27
1. INTRODUCTION page 1
1. INTRODUCTION
1.1. SCOPE AND PURPOSE OF MANUAL
This manual is designed to enable operating and service personnel to properly operate and care
for the AM-255. Since applications are necessarily site-specific, operation procedures are given
in general terms. Service and repair are covered to the board level. Anything more complex
than this requires that the instrument or assembly be returned to TSA.
1.2. GENERAL DESCRIPTION
The TSA Model AM-255 Alarm Monitor is a self-contained unit designed for use with TSA’s
personnel and vehicle portal monitors. The AM-255 provides both audible and visual alarm
indication for radiation level, high and low background, low power and tamper conditions. In
addition, output relays are provided to integrate the AM-255 into existing alarm systems.
The AM-255 is a dual input instrument, which will monitor two sets of pillars, or two master
pillars. It has two complete sets of front panel lamps, as well as two input and two output
connectors. The two systems are totally independent.
1.3. SAFETY PRECAUTIONS
WARNINGS:
The AM-255 uses 90 to 250Vac for the battery charger. Service should only be performed by
qualified technical personnel.
The maximum voltage and current being switched by the relays must not exceed 0.6 amp
at 120Vac.
CAUTIONS:
As with any sensitive electronic instrument, the AM-255 should not be dropped or subjected to
severe mechanical shock.
Model AM-255
1. INTRODUCTION page 2
1.4. SPECIFICATIONS
Display: 4 alarm indicator LEDs per pillar being monitored;
One systems ready LED, one power on LED
Power: Internal: 12 volt, 7Ah sealed lead-acid battery pack
Relay Power: Maximum 0.6 amp at 120Vac
Battery life: More than 24 hours of normal operation
Controls: Momentary contact alarm acknowledge switch, key lock switch,
and lamp test switch
Connectors:
Input: One 4 pin, quick connect type terminal strip per system
Output: One 12 pin, quick connect type terminal strip per system
Dimensions: 7.5"h x 8.375"w x 8"d (19 x 21.3 x 20.3cm)
Weight: ≈15lb (6.8kg)
Environmental:
Temperature: 32˚ to 120˚F (0˚ to 50˚C)
Humidity: Up to 95% non-condensing
Model AM-255
2. INSPECTION AND SET-UP page 3
2. INSPECTION AND SETUP
The following procedures should allow on-site personnel to correctly install and set up the
AM-255 for normal operation. Follow the procedures in the order given. It is recommended that
a copy of the Initial Installation Set-Up Checklist (section 2.4.). be filled out after initial
installation and whenever the AM-255 is put into service after prolonged storage.
If necessary, consult TSA Systems for assistance in case of unusual site conditions or special
requirements.
2.1. INSPECTION
2.1.1. Incoming Inspection:
Immediately inspect the instrument for mechanical damage, scratches, dents or other defects. It
should be examined for evidence of concealed, as well as external damage.
2.1.2. Damage Claims;
If the instrument is damaged in transit or fails to meet specifications upon receipt, notify the
carrier and TSA Systems immediately. Shipping cartons, packing materials, waybills and other
such documentation should be preserved for the carrier’s inspection. TSA will assist in
providing replacement or repair of the instrument if necessary.
2.1.3. Storage;
If the instrument is to be stored for any length of time, first disconnect power to the instrument
and remove and store any batteries separately in a cool place. If batteries are to be stored for
any length of time, they should be inspected and charged if necessary at least once a month.
Care should always be taken to avoid subjecting the instrument to severe mechanical or
environmental shock. The instrument should be stored in a dry, temperature constant location.
Model AM-255
2. INSPECTION AND SET-UP page 4
2.1.4. Shipping:
Before returning the instrument for any reason, notify TSA Systems of the difficulty
encountered, giving the model and serial numbers of the equipment. TSA will furnish specific
shipping instructions.
2.2. SET-UP PROCEDURES
An Initial Setup Checklist is included at the end of this section. It is recommended that a copy
of this be filled out when the AM-255 is first installed, and whenever it is put into service after
prolonged storage.
Input and output connections are located on the AM-255 board. There are two 5 pin terminal
strips for alarm input connections from the portal Monitors. There are also two 12 pin terminal
strips to provide connections to an external alarm system.
To install the AM-255, use the following procedure.
NOTE: Due to varying site requirements, the cable between the AM-255 and the system to be
monitored is not shipped with the AM-255. Any commercial quality, five conductor, 22 ga,
signal cable may be used.
2.2.1. Connect the Cables:
Connect the cables from the portal monitor to the alarm input connections. Information
on portal monitor alarm connections can be found in the Operating and Service Manual for that
monitor. Next loosen the two screws at the bottom corners of the front panel and open the panel.
2.2.2. Connect the Alarm Output Cables:
Connect the alarm output cables as required. The AM-255 will operate properly with or without
these connected.
Model AM-255
2. INSPECTION AND SET-UP page 5
2.2.3. Connect the Positive Battery Cable:
The positive battery cable is disconnected for shipping, and must be connected to the positive
battery terminal.
2.2.4. Power:
Plug the power cord into a standard 90 to 250Vac outlet.
2.2.5. Toggle Power Switch:
There is a toggle power switch on the circuit board. This switch must be turned on (away from
the connector edge of the board). The green power LED on the front panel will be illuminated
to indicate that the battery is charged and connected, and the power switch is in the on position.
2.2.6. Jumper:
There is a jumper on the AM-255 board to select blinking or steady alarm lamps. The board will
be jumped for blinking when the unit is shipped. If steady lamps are preferred, move the jumper
to the steady position.
2.3. WIRING INSTRUCTIONS
Four strain reliefs are provided in the back panel of the enclosure to accommodate The cables
from the portal system(s) and the relay outputs to the site’s alarm system. Remove the cap by
unscrewing it, remove the plastic washer and rubber weather seal. Feed the cables through the
nut, washer, seal, and into the enclosure.
NOTE: There is a nylon tool for the terminal strips supplied with the AM-255. It is shipped on
the key ring along with the keys for the key switch.
Model AM-255
2. INSPECTION AND SET-UP page 6
Connect the wires to the appropriate connections on the terminal strips. The following tables
outline the connections.
SYSTEM #1
INPUT SIGNALS RELAY OUTPUTS
Signal Terminal Strip, Pin Signal Terminal Strip, Pin
Radiation Alarm J3-1 Radiation, C J4-1
High Background J3-2 Radiation, NC J4-2
Low Background J3-3 Radiation, NO J4-3
Tamper J3-4* High Background, C J4-4
Common J3-5 High Background, NC J4-5
High Background, NO J4-6
Low Background, C J4-7
Low Background, NC J4-8
Low Background, NO J4-9
Tamper, C J4-10
Tamper, NC J4-11
Tamper, NO J4-12
Model AM-255
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