SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549

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


                                    FORM 8-K


                                 CURRENT REPORT

                       Pursuant to Section 13 or 15(d) of
                       the Securities Exchange Act of 1934



                                 Date of Report
                       (Date of earliest event reported):

                                 March 30, 2000

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


                               THERMO SENTRON INC.
             (Exact name of Registrant as specified in its charter)


Delaware                         1-14254                              41-1827303
(State or other                (Commission                      (I.R.S. Employer
jurisdiction of                 File Number)              Identification Number)
incorporation or
organization)


501 90th Avenue NW
Minneapolis, Minnesota                                                     55433
 (Address of principal executive offices)                             (Zip Code)


                                 (781) 622-1000
                         (Registrant's telephone number
                              including area code)



<PAGE>


This Form 8-K contains forward-looking statements that involve a number of risks
and  uncertainties.  Important factors that could cause actual results to differ
materially from those indicated by such forward-looking statements include those
set forth under the heading  "Forward-looking  Statements"  in Exhibit 13 to the
company's  annual report on Form 10-K for the year ended January 1, 2000.  These
include  risks  and  uncertainties   relating  to:   international   operations,
government  regulation and  approvals,  competition,  the company's  acquisition
strategy,  the  impact  of  technological  change  and new  products,  potential
fluctuation  in  quarterly  performance,   and  the  company's  cash  management
arrangement with Thermo Electron.

Item 5.     Other Events

      On March 31, 2000, the Registrant issued a press release,  attached hereto
as Exhibit 99, regarding the previously announced tender offer for its shares of
common stock,  $.01 par value per share, by its parent  corporation,  Thermedics
Inc.

Item 7.     Financial Statements, Pro Forma Financial Information and Exhibits

      (a)   Financial Statements of Business Acquired: not applicable.

      (b)   Pro Forma Financial Information: not applicable.

      (c)   Exhibits

            99 Press Release dated March 31, 2000.


<PAGE>


                                    SIGNATURE



      Pursuant to the  requirements of the Securities  Exchange Act of 1934, the
Registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned, thereunto duly authorized, on this 31st day of March, 2000.



                                        THERMO SENTRON INC.



                                        By:  /s/ Theo Melas-Kyriazi
                                             ------------------------------
                                             Theo Melas-Kyriazi
                                             Chief Financial Officer



<PAGE>



                                                                      Exhibit 99

Investor Contact: 781-622-1111
Media Contact: 781-622-1252

                Cash Tender Offer for Thermo Sentron Completed

MINNEAPOLIS,  Minn.,  March 31, 2000 - Thermo Sentron Inc.  (ASE-TSR),  a Thermo
Electron  company,  announced  today that its parent  company,  Thermedics  Inc.
(ASE-TMD),  has successfully completed its cash tender offer of $15.50 per share
for any and all outstanding shares of Thermo Sentron common stock.

      The offer and withdrawal rights expired at midnight on Thursday, March 30,
2000. Based on the preliminary report of the depositary for the offer,  American
Stock Transfer & Trust Company,  approximately  1,144,000  Thermo Sentron shares
were tendered.  This brings  Thermedics' and Thermo  Electron's  combined equity
ownership in Thermo Sentron to approximately 98.6 percent. Thermedics expects to
complete the spin-in of Thermo Sentron by Tuesday, April 4, through a short-form
merger.  The  short-form  merger  does  not  require  Thermo  Sentron  board  or
shareholder approval.

      Shareholders  who  tendered  their shares in the tender offer will receive
payment for their shares shortly.  Shareholders  who did not tender their shares
will  also  receive  $15.50  per  share in the  short-form  merger.  Information
outlining  what steps  these  Thermo  Sentron  shareholders  must take to obtain
payment will be mailed within a week to 10 days.

     The complete  terms and conditions of the tender offer are set forth in the
offer to purchase,  letter of transmittal,  and other related  materials,  which
were filed with the Securities and Exchange Commission on March 3, 2000.

      Thermo  Sentron  Inc.  develops,   manufactures,  and  markets  high-speed
precision-weighing  and  inspection  equipment for packaging  lines in the food,
pharmaceutical,  mail order,  and other  industries,  as well as for  industries
using bulk  materials.  The  company's  products for the  packaged-goods  market
include checkweighers and metal detectors. Thermo Sentron is a public subsidiary
of Thermedics  Inc.,  another  Thermo  Electron  company.  More  information  is
available on the Internet at http://www.thermo.com/subsid/tsr1.html.

The following constitutes a "Safe Harbor" statement under the Private Securities
Litigation  Reform Act of 1995:  This  press  release  contains  forward-looking
statements that involve a number of risks and  uncertainties.  Important factors
that could cause actual  results to differ  materially  from those  indicated by
such  forward-looking  statements  include  those  set forth  under the  heading
"Forward-looking  Statements"  in Exhibit 13 to the  company's  annual report on
Form  10-K  for the  year  ended  January  1,  2000.  These  include  risks  and
uncertainties relating to: international  operations,  government regulation and
approvals, competition, acquisition strategy, the impact of technological change
and new  products,  potential  fluctuation  in  quarterly  performance,  and the
company's cash management arrangement with Thermo Electron.
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SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549

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

                                    FORM 8-K

                                 CURRENT REPORT

                       Pursuant to Section 13 or 15(d) of
                       the Securities Exchange Act of 1934

                                 Date of Report
                       (Date of earliest event reported):

                                 March 30, 2000

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

                               THERMO SENTRON INC.
             (Exact name of Registrant as specified in its charter)

Delaware                         1-14254                              41-1827303
(State or other                (Commission                      (I.R.S. Employer
jurisdiction of                 File Number)              Identification Number)
incorporation or
organization)

501 90th Avenue NW
Minneapolis, Minnesota                                                     55433
 (Address of principal executive offices)                             (Zip Code)

                                 (781) 622-1000
                         (Registrant's telephone number
                              including area code)
This Form 8-K contains forward-looking statements that involve a number of risks
and  uncertainties.  Important factors that could cause actual results to differ
materially from those indicated by such forward-looking statements include those
set forth under the heading  "Forward-looking  Statements"  in Exhibit 13 to the
company's  annual report on Form 10-K for the year ended January 1, 2000.  These
include  risks  and  uncertainties   relating  to:   international   operations,
government  regulation and  approvals,  competition,  the company's  acquisition
strategy,  the  impact  of  technological  change  and new  products,  potential
fluctuation  in  quarterly  performance,   and  the  company's  cash  management
arrangement with Thermo Electron.

Item 5.     Other Events

      On March 31, 2000, the Registrant issued a press release,  attached hereto
as Exhibit 99, regarding the previously announced tender offer for its shares of
common stock,  $.01 par value per share, by its parent  corporation,  Thermedics
Inc.

Item 7.     Financial Statements, Pro Forma Financial Information and Exhibits

      (a)   Financial Statements of Business Acquired: not applicable.

      (b)   Pro Forma Financial Information: not applicable.

      (c)   Exhibits

            99 Press Release dated March 31, 2000.
SIGNATURE

      Pursuant to the  requirements of the Securities  Exchange Act of 1934, the
Registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned, thereunto duly authorized, on this 31st day of March, 2000.

                                        THERMO SENTRON INC.

                                        By:  /s/ Theo Melas-Kyriazi
                                             ------------------------------
                                             Theo Melas-Kyriazi
                                             Chief Financial Officer
Exhibit 99

Investor Contact: 781-622-1111
Media Contact: 781-622-1252

                Cash Tender Offer for Thermo Sentron Completed

MINNEAPOLIS,  Minn.,  March 31, 2000 - Thermo Sentron Inc.  (ASE-TSR),  a Thermo
Electron  company,  announced  today that its parent  company,  Thermedics  Inc.
(ASE-TMD),  has successfully completed its cash tender offer of $15.50 per share
for any and all outstanding shares of Thermo Sentron common stock.

      The offer and withdrawal rights expired at midnight on Thursday, March 30,
2000. Based on the preliminary report of the depositary for the offer,  American
Stock Transfer & Trust Company,  approximately  1,144,000  Thermo Sentron shares
were tendered.  This brings  Thermedics' and Thermo  Electron's  combined equity
ownership in Thermo Sentron to approximately 98.6 percent. Thermedics expects to
complete the spin-in of Thermo Sentron by Tuesday, April 4, through a short-form
merger.  The  short-form  merger  does  not  require  Thermo  Sentron  board  or
shareholder approval.

      Shareholders  who  tendered  their shares in the tender offer will receive
payment for their shares shortly.  Shareholders  who did not tender their shares
will  also  receive  $15.50  per  share in the  short-form  merger.  Information
outlining  what steps  these  Thermo  Sentron  shareholders  must take to obtain
payment will be mailed within a week to 10 days.

     The complete  terms and conditions of the tender offer are set forth in the
offer to purchase,  letter of transmittal,  and other related  materials,  which
were filed with the Securities and Exchange Commission on March 3, 2000.

      Thermo  Sentron  Inc.  develops,   manufactures,  and  markets  high-speed
precision-weighing  and  inspection  equipment for packaging  lines in the food,
pharmaceutical,  mail order,  and other  industries,  as well as for  industries
using bulk  materials.  The  company's  products for the  packaged-goods  market
include checkweighers and metal detectors. Thermo Sentron is a public subsidiary
of Thermedics  Inc.,  another  Thermo  Electron  company.  More  information  is
available on the Internet at http://www.thermo.com/subsid/tsr1.html.

The following constitutes a "Safe Harbor" statement under the Private Securities
Litigation  Reform Act of 1995:  This  press  release  contains  forward-looking
statements that involve a number of risks and  uncertainties.  Important factors
that could cause actual  results to differ  materially  from those  indicated by
such  forward-looking  statements  include  those  set forth  under the  heading
"Forward-looking  Statements"  in Exhibit 13 to the  company's  annual report on
Form  10-K  for the  year  ended  January  1,  2000.  These  include  risks  and
uncertainties relating to: international  operations,  government regulation and
approvals, competition, acquisition strategy, the impact of technological change
and new  products,  potential  fluctuation  in  quarterly  performance,  and the
company's cash management arrangement with Thermo Electron.