THERMO ELECTRON CORP
SC 13D/A, 1998-06-01
MEASURING & CONTROLLING DEVICES, NEC
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                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13D

                    Under the Securities Exchange Act of 1934

                                (Amendment No. 4)

                               Thermo Sentron Inc.

                                (Name of Issuer)

                     Common Stock, par value $.01 per share

                         (Title of Class of Securities)

                                   883593 10 5
                                 (CUSIP Number)


 Seth H. Hoogasian, Esq.                           Thermo Electron Corporation
     General Counsel                                        81 Wyman Street
     (781) 622-1000                                     Waltham, MA 02254-9046
- -------------------------------------------------------------------------------
 (Name, Address and Telephone Number of Person Authorized to Receive Notices 
                              and Communications)


                                  April 9, 1998
- -------------------------------------------------------------------------------
             (Date of Event which Requires Filing of this Statement)

If the filing person has previously  filed a statement on Schedule 13G to report
the  acquisition  which is the subject of this  Schedule 13D, and is filing this
schedule because of Rule 13d-1(b) (3) or (4), check the following box [ ].

- -------------------------------------------------------------------------------
* The remainder of this cover page shall be filled out for a reporting  person's
initial filing on this form with respect to the subject class of securities, and
for any  subsequent  amendment  containing  information  which  would  alter the
disclosures provided in a prior cover page.

- -------------------------------------------------------------------------------
The information required in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the  Securities  Exchange  Act of
1934 ("Act") or otherwise  subject to the liabilities of that section of the Act
but  shall be  subject  to all other  provisions  of the Act  (however,  see the
Notes).

<PAGE>


- --------------------------------------- ---------------------------------------
 1             NAME OF REPORTING PERSON
               S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
               Thermo Electron Corporation
               IRS No. 04-2209186

- --------------------------------------- ---------------------------------------
 2             CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

                                                                (a)  [   ]
                                                                (b)  [ x ]
- -------------------------------------------------------------------------------
 3             SEC USE ONLY
- -------------------------------------------------------------------------------

 4             SOURCE OF FUNDS*


               WC

- -------------------------------------------------------------------------------
 5             CHECK BOX IF DISCLOSURE OF 
               LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
               ITEMS 2(d) or 2(e)                                   [   ]

- -------------------------------------------------------------------------------

 6             CITIZENSHIP OR PLACE OF ORGANIZATION

               State of Delaware
- -------------------------------------------------------------------------------

NUMBER OF                       7       SOLE VOTING POWER
SHARES                        
BENEFICIALLY                            7,813,600
OWNED BY EACH
REPORTING 
PERSON WITH                         
- --------------------------- ----------- ---------------------------------------
                                8       SHARED VOTING POWER


                                        0
- --------------------------- ----------- ---------------------------------------

                                9       SOLE DISPOSITIVE POWER


                                        7,813,600
- --------------------------- ----------- ---------------------------------------

                                10      SHARED DISPOSITIVE POWER


                                        0
- --------------------------- ----------- ---------------------------------------

<PAGE>


- --------------------------------------- ---------------------------------------
 11             AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                7,813,600

- -------------------------------------------------------------------------------
12             CHECK BOX IF THE AGGREGATE AMOUNT IN
               ROW (11) EXCLUDES CERTAIN SHARES*                          [   ]
- -------------------------------------------------------------------------------

 13             PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11


                79.3%
- -------------------------------------------------------------------------------
14              TYPE OF REPORTING PERSON *

                CO
- -------------------------------------------------------------------------------


<PAGE>


         Thermo Electron Corporation hereby amends its statement on Schedule 13D
relating to the shares (the "Shares") of common stock, par value $.01 per share,
of Thermo Sentron Inc. (the "Issuer"), as set forth below.

Item 2.  Identity and Background

         Item 2 is hereby amended and restated in its entirety as follows:

     This  Amendment  is  being  filed  by  Thermo  Electron   Corporation  (the
"Reporting  Person"),  pursuant  to Rule  13d-2,  to reflect an  increase in the
Reporting  Person's holdings of the Issuer's Shares since the Reporting Person's
last filing on Schedule  13D, in December  1997,  of more than one percent.  The
Reporting  Person  holds the Shares of the Issuer  that are the  subject of this
Amendment  through one or more controlled  subsidiaries.  As of the date of this
Amendment,  7,000,000  Shares were held by  Thermedics  Inc.  ("Thermedics"),  a
majority-owned subsidiary of the Reporting Person.

         The Reporting Person develops,  manufactures and markets environmental,
analytical and process control instruments,  cogeneration and alternative-energy
power  plants,   low-emission  combustion  systems,  paper  and  waste-recycling
equipment,  and biomedical products.  The Reporting Person also provides a range
of services  including  environmental  remediation  and  consulting,  laboratory
analysis, and metals fabrication and processing, as well as research and product
development  in  unconventional  imaging,  adaptive  optics,  and direct  energy
conversion.

         The  principal  business  address and principal  office  address of the
Reporting  Person,  a  Delaware  corporation,   is  81  Wyman  Street,  Waltham,
Massachusetts 02254-9046.

         Appendix A attached to this  Amendment  sets forth with respect to each
executive  officer and director of the Reporting Person his or her (a) name; (b)
residence or business address;  (c) present  principal  occupation or employment
and the  name,  principal  business  and  address  of any  corporation  or other
organization in which such employment is conducted; and (d) citizenship.  To the
knowledge of the Reporting Person,  there is no person who may be deemed to be a
controlling person of the Reporting Person.

         During the last five years,  neither the  Reporting  Person nor (to the
knowledge  of the  Reporting  Person) any  executive  officer or director of the
Reporting Person has been convicted in a criminal proceeding  (excluding traffic
violations and similar misdemeanors).

         During the last five years,  neither the  Reporting  Person nor (to the
knowledge  of the  Reporting  Person) any  executive  officer or director of the
Reporting  Person  has  been a party  to a civil  proceeding  of a  judicial  or
administrative  body of competent  jurisdiction  which  resulted in a judgement,
decree or final order (i) enjoining  future  violations  of, or  prohibiting  or
mandating  activities  subject  to,  federal  or state  securities  laws or (ii)
finding a violation with respect to such laws.



<PAGE>


Item 3.  Source and Amount of Funds or Other Consideration.

         Item 3 is hereby amended and restated in its entirety as follows:

         The Reporting Person has expended  approximately $994,700 in purchasing
Shares of the Issuer  since the date of its last filing on Schedule  13D.  These
funds were paid out of the Reporting Person's working capital.

Item 4.  Purpose of Transaction

         Item 4 is hereby amended and restated in its entirety as follows:

         The Reporting  Person may make purchases of Shares or other  securities
of the  Issuer  in  such  manner  and in such  amounts  as it  determines  to be
appropriate  in order to maintain  at least 50%  ownership  of the  Issuer.  The
Reporting  Person  may  also  make  additional  purchases  of  Shares  or  other
securities  of the Issuer in such manner and in such amounts as it determines to
be appropriate  for other  purposes.  In determining  whether to do so for other
purposes, the Reporting Person will consider various relevant factors, including
its  evaluation of the Issuer's  business,  prospects  and financial  condition,
amounts and prices of  available  securities  of the Issuer,  the market for the
Issuer's securities,  other opportunities  available to the Reporting Person and
general market and economic conditions. Purchases may be made either on the open
market or directly from the Issuer.

         Except as set forth in this Item 4 and Item 6,  neither  the  Reporting
Person nor, to the Reporting Person's  knowledge,  any of the executive officers
or directors of the Reporting  Person has any current  plans or proposals  which
relate to or would result in any of the actions specified in clauses (a) through
(j) of Item 4 of Schedule  13D,  although  the  Reporting  Person and such other
persons do not rule out the  possibility  of  effecting or seeking to effect any
such actions in the future.

Item 5.  Interest in Securities of the Issuer.

         Items 5 (a) - (c) are hereby  amended and restated in their entirety as
follows:

         (a)  The  Shares  beneficially  owned by the Reporting  Person
include 813,600 Shares, or approximately 8.3% of the outstanding  Shares,  owned
directly by the Reporting Person and 7,000,000  Shares,  or approximately 71% of
the outstanding Shares,  owned by Thermedics.  To the knowledge of the Reporting
Person,   the  executive   officers  and  directors  of  the  Reporting   Person
beneficially  own an aggregate of 141,848  Shares or  approximately  1.4% of the
outstanding  Shares.  To the  knowledge  of the  Reporting  Person,  the  Shares
beneficially  owned by all  executive  officers and  directors of the  Reporting
Person include 105,500 Shares that such persons have the right to acquire within
60 days through the exercise of stock options.  Ownership  information  for each
executive  officer and director of the  Reporting  Person who owns Shares is set
forth below.



<PAGE>




Name                                                       Number of Shares(1)
- ----                                                       -------------------
John M. Albertine                                                        1,000
Peter O. Crisp                                                           1,500
Elias P. Gyftopoulos                                                     1,000
George N. Hatsopoulos                                                   17,000
John N. Hatsopoulos                                                     41,900
Frank Jungers                                                            1,000
Paul F. Kelleher                                                         5,000
Robert A. McCabe                                                         3,000
Frank E. Morris                                                          1,000
Donald E. Noble                                                         17,448
Hutham S. Olayan                                                         1,000
Peter G. Pantazelos                                                      2,000
William A. Rainville                                                     7,000
Arvin H. Smith                                                           7,000
Roger D. Wellington                                                      1,000
John W. Wood Jr.                                                        34,000
All directors and current executive officers as a group (17 persons)   141,848

     (1) Shares reported as beneficially owned by Dr. Albertine,  Mr. Crisp, Dr.
Gyftopoulos,  Dr. G. Hatsopoulos, Mr. J. Hatsopoulos, Mr. Jungers, Mr. Kelleher,
Mr. McCabe, Dr. Morris,  Mr. Noble, Ms. Olayan,  Mr. Pantazelos,  Mr. Rainville,
Mr. Smith, Mr. Wellington,  Mr. Wood and all directors and executive officers as
a group include 1,000, 1,500, 1,000, 15,000, 15,000, 1,000, 5,000, 1,000, 1,000,
15,000,   1,000,   2,000,  7,000,  7,000,  1,000,  31,000  and  105,500  Shares,
respectively, that such person or members of the group have the right to acquire
within 60 days.

While certain directors and executive  officers of the Reporting Person are also
directors  and  officers of the Issuer,  all such  persons  disclaim  beneficial
ownership of the Shares owned by the Reporting Person.

(b) The  Reporting  Person  and the  executive  officers  and  directors  of the
Reporting Person have the sole power to vote and dispose of the Shares each such
person owns.



<PAGE>


     (c) The  Reporting  Person has effected  the  following  transactions  with
respect to the Shares during the past 60 days:

Date           Amount          Price Per Share             Transfer Type
- ------------------------------------------------------------------------------ 
04/09/98       10,000           $12.06                     Open Market Purchase
04/09/98       23,900           $12.00                     Open Market Purchase
04/13/98        2,800           $12.00                     Open Market Purchase
04/14/98        2,800           $12.00                     Open Market Purchase
04/15/98       34,600           $12.00                     Open Market Purchase
04/16/98        2,800           $12.13                     Open Market Purchase


To the knowledge of the Reporting Person,  the executive  officers and directors
of the Reporting  Person have effected no transactions in the Shares in the past
60 days.

Item 6. Contracts, Arrangements, Understandings or Relationships with respect to
Securities of the Issuer.

         The first  paragraph  of Item 6 is hereby  amended and  restated in its
entirety as follows:

         Of the 7,813,600  Shares  beneficially  owned by the Reporting  Person,
116,950  Shares are  subject to options to acquire  such  Shares  granted by the
Reporting  Person pursuant to its director and employee stock option plans.  The
executive  officers  and  directors  of the  Reporting  Person  have the  right,
pursuant to such options,  to acquire 23,000 Shares. In addition,  the following
executive  officers  and  directors  of the  Reporting  Person have the right to
acquire  shares from the Issuer  pursuant to the Issuer's  director and employee
stock option plans:  Dr. G.  Hatsopoulos  has the right to acquire 15,000 Shares
within 60 days; Mr. J. Hatsopoulos has the right to acquire 15,000 Shares within
60 days; Mr.  Kelleher has the right to acquire 5,000 Shares within 60 days; Mr.
Noble has the right to acquire  15,000 Shares  within 60 days;  and Mr. Wood has
the right to acquire 31,000 Shares within 60 days.



<PAGE>


Signature

         After  reasonable  inquiry and to the best of its knowledge and belief,
the Reporting  Person certifies that the information set forth in this statement
is true, complete and correct.


Date:    May 29, 1998                           THERMO ELECTRON CORPORATION

                                                By:      /s/ Melissa F. Riordan
                                                             Melissa F. Riordan
                                                             Treasurer


<PAGE>







         Appendix A is hereby amended and restated in its entirety as follows:

                                   APPENDIX A

         The following individuals are executive officers or directors of Thermo
Electron  Corporation  ("Thermo  Electron").  Unless  otherwise  noted, all such
individuals  are citizens of the United  States.  Unless  otherwise  noted,  the
business  address  of each  executive  officer  of Thermo  Electron  is 81 Wyman
Street, Waltham, Massachusetts 02254-9046.

John M. Albertine:

Director, Thermo Electron

         Dr.  Albertine is Chairman of the Board and Chief Executive  Officer of
Albertine Enterprises,  Inc., an economic and public policy consulting firm. His
business  address is Albertine  Enterprises,  Inc., 1156 15th Street N.W., Suite
505, Washington, DC 20005.

Peter O. Crisp:

Director, Thermo Electron

     Mr.  Crisp was,  until 1997,  a General  Partner of Venrock  Associates,  a
venture capital  investment  firm. His address is 103 Horseshoe Road, Mill Neck,
New York 11765-1005

Elias P. Gyftopoulos:

Director, Thermo Electron

     Dr.  Gyftopoulos is Professor  Emeritus of the  Massachusetts  Institute of
Technology. His business address is Massachusetts Institute of Technology,  Room
24-109, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139.

Frank Jungers:

Director, Thermo Electron

     Mr.  Jungers is a consultant on business and energy  matters.  His business
address is 822 NW Murray, Suite 242, Portland, Oregon 97229.

Robert A. McCabe:

Director, Thermo Electron

     Mr. McCabe is President of Pilot Capital  Corporation,  a firm specializing
in private  investment and acquisition  services.  His business address is Pilot
Capital Corporation, 444 Madison Avenue, Suite 2103, New York, New York 10022.

Frank E. Morris:

Director, Thermo Electron

     Dr. Morris  served as President of the Federal  Reserve Bank of Boston from
1968 until he retired  in 1988.  Dr.  Morris  also  served as the Peter  Drucker
Professor of Management  at Boston  College from 1989 to 1994.  His  residential
address is P.O. Box 825, 24 Sugarhouse Road, New London, New Hampshire 03257.

Donald E. Noble:

Director, Thermo Electron

     For more than 20 years,  from 1959 to 1980,  Mr.  Noble served as the Chief
Executive Officer of Rubbermaid, Incorporated, first with the title of President
and  then  as  Chairman  of  the  Board.  His  business  address  is  Rubbermaid
Incorporated, 1147 Akron Road, Wooster, Ohio 44691.

Hutham S. Olayan:

Director, Thermo Electron

     Ms. Olayan is the President and a director of Olayan America Corporation, a
member of the Olayan  Group that is engaged in  advisory  services  and  private
investments, including real estate. Her business address is Suite 1100, 505 Park
Avenue, New York, New York 10022. Ms. Olayan is a citizen of Saudi Arabia.

Richard F. Syron:

Director, Thermo Electron

     Mr.  Syron has served as the Chairman  and Chief  Executive  Officer of the
American Stock Exchange since 1994. Mr. Syron was President and Chief  Executive
Officer of the Federal  Reserve  Bank of Boston from 1989 to 1994.  His business
address is 86 Trinity Place, New York, New York 10006.

Roger D. Wellington:

Director, Thermo Electron

     Mr.  Wellington is the President and Chief Executive  Officer of Wellington
Consultants,  Inc. and of Wellington  Associates,  Inc.,  international business
consulting firms. His address is P.O. Box 8186, Longboat Key, Florida 34228.

George N. Hatsopoulos:             Director, Chairman of the Board and Chief 
                                   Executive Officer, Thermo Electron

John N. Hatsopoulos:               Director, President and Chief Financial 
                                   Officer, Thermo Electron

Peter G. Pantazelos:               Executive Vice President, Corporate 
                                   Development, Thermo Electron

Arvin H. Smith:                    Eecutive Vice President, Thermo Electron

William A. Rainville:              Senior Vice President, Thermo Electron

John W. Wood Jr.:                  Senior Vice President, Thermo Electron
     
Paul F. Kelleher:                  Senior Vice President, Finance & 
                                   Administration and Chief Accounting Officer, 
                                   Thermo Electron


<PAGE>







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