protecting function can be opened.
The first protection is that,using double password setting of senders and receivers,only

when both of the passwords are input respectively,can the data parameters be set(as if there

are two software keys).
The second complete protection is that,once one of them reveals the password or one password

is stolen in other ways,it still can bring about a problem of illegal data

modifying.Therefore incident record function can be opened,so that if any parameter is

modified(saved confirmed),the incidents can be recorded including the time and counts,and

this record can never be deleted by users.Then after both sides assure the incidents count

record,and the count is not admitted by both sides,it can be sure that someone has illegally

set the data,and the modifying time can be searched.
2,When meter for trading settlement is off electricity or on error,it can bring about lose

of flow data.Therefore most of manufacturers home and abroad have set record function of

flowmeter totalizer when off electricity of its own body,which makes sure that the meters

are just and fair.But for attended flow transmitter off electricity or offline,the function

can't recognize this,and the history record during this time is zero.This is deemed to be

normal in uncontinual flow using occation.However,the record function of flowmeters off

electricity or on error can correctly judge the two situations of the zero flow,and it also

can find out if the zero flow is caused by flow transmitter on error,and takes records of

the time when this happens and when it recovers.This record can't be deleted forever by

users either.
3,In the flow measurement system,compensation meter has the same important status as

flowmeter.If compensation pressure or temperature meter goes wrong,not handled in time,even

though the flow measurement show nornally,there would be some difference in data calculated

by the totalizer,and it could be several times more serious.
The auto recognizing and rescuing function of compensation meters on error is that:Once

there's some problem with the compensation meter,the display meter can judge and cut off the

data automatically in time,and use a fixed value to work,meanwhile send alarm to remind the users

to deal with it as soon as possible(the value can be disccussed by the two sides),so that

the difference which is caused by a normal flowmeter but a wrong compensation meter can be

avoided.