TO 31S9-4-31-1 Chg 1
Section I. GENERAL
a. This manual is for your use in utilizing and
Support Command, ATTN: AMSTS-MPP, 4300
maintaining the Balanced Magnetic Switch SA- 1955(
Goodfellow Blvd., St. Louis, MO 63120. A reply will be
)/FSS-9(V), an integral part of the Joint- Services
furnished direct to you.
Interior Intrusion Detection System (J- SIIDS). Detailed
information on each of the other major system
b. For Air Force personnel, reporting of errors,
components is available in the applicable technical
omissions and recommendations for improving these
manuals listed in appendix A.
publications should be submitted on AFTO Form 22 and
forwarded to HQ, SAAMA/MM- STR, Kelly AFB, Texas
b. This manual contains equipment description and
data; organizational, direct support, and general support
maintenance instructions for preventive maintenance,
c. For Navy personnel, reporting of errors,
troubleshooting, and corrective maintenance; and repair
omissions and recommendations for improving this
parts. There are no operating instructions for the unit
publication should be submitted on Technical Manual
since there are no operator controls.
User Activity Comment Sheet and forwarded to Naval
Electronic Systems Command, National Center Building
1, ATTN: ELEX-4903, Washington, D. C. 20360.
technical manuals, and other publications applicable to
the balanced magnetic switch.
1-5. Destruction of Army Materiel to Prevent Enemy
d. Appendix B contains the maintenance allocation
Instructions covering the destruction of Army materiel to
e. Appendix C contains an illustrated parts lists
prevent enemy use are contained in TM 750-244-3.
that will aid in the identification of authorized repair
1-2. Maintenance Forms and Records
TM 740-90-1 contains
Department of the Army forms and procedures used for
equipment maintenance will be those prescribed by TM
There are no calibration procedures for this equipment.
1-3. Equipment Serviceability Criteria (ESC).
2028-2 (Recommended Changes to Equipment
Technical Manuals) located in the back of the manual
and mail the form direct to Commander, US Army Troop
Section II. DESCRIPTION AND DATA
1-8. Purpose and Use
a.The balanced magnetic switch (BMS) is one of a
window or door (or other type of entrance) is opened into
series of sensors used to detect an intrusion into a
an area which is secured.
secure area. The BMS detects an intrusion whenever a
b. The BMS (fig. 1-1) consists of two major
components: a magnetic switch assembly (switch