Bronkhorst CORI-FLOW User Manual download pdf (Page 18)

BRONKHORST CORI-TECH B.V.

3.3 Zeroing

3.3.1 Zeroing with the Micro-switch

Before using the instrument zeroing is required.

• Set process conditions

After warm-up, pressure up the system and fill the CORI-FLOW according to

the process conditions

• Stop flow

Make sure no flow is going through the instrument by closing valves near the

instrument (for types M52, M53 and M54 two valves (one before and one after)

the instrument are required).

• Press and hold, Until

With no flow, use the push-button switch (#) on the right side of the instrument

to start the zero adjustment procedure.

Press the push-button (#) and hold it, after a short time the red LED will go ON

and OFF then the green LED will go ON. At that moment release the push-

button (#).

• Zeroing

The zeroing procedure will start at that moment and the green LED will blink

fast. The zeroing procedure waits for a stable signal and saves the zero. If the

signal is not stable zeroing will take long and the nearest point to zero is

accepted. The procedure will take approx. 10 sec.

So make always sure that there is going no flow through the instrument when

performing the zeroing procedure.

• Ready

When indication is showing 0% signal and the green indication LED is burning

continuously again, then zero has been performed well.

3.3.2 Zeroing through the digital communication

It is also possible to start the automatic zero adjustment procedure through the FLOW-BUS, using a E-7000

readout/control unit or a software program on a PC, connected to a FLOW-BUS interface module.

The following parameters must be used for zeroing an instrument:

Initreset

[unsigned char, RW,0...255, DDEpar. = 7, Proces/par. = 0/10]

Cntrlmode

[unsigned char, RW,0...255, DDEpar. = 12, Proces/par. = 1/4]

CalMode

[unsigned char, RW,0...255, DDEpar. = 58, Proces/par. = 115/1]

• Set process conditions

Warm-up, pressure up the system and fill the instrument according to the process conditions.

• Stop flow

Make sure no flow is going through the instrument by closing valves near the instrument.

• Send parameters

Send the following values to the parameters in this sequence.

Initreset 64

Cntrlmode 9

Calmode 255

Calmode 0

Calmode 9

• Zeroing

The zeroing procedure will start at that moment and the green LED will blink fast. The zeroing

procedure waits for a stable signal and saves the zero. If the signal is not stable zeroing will take

long and the nearest point to zero is accepted. The procedure will take approx. 10 sec.

So make always sure that there is going no flow through the instrument when performing the zeroing

procedure.

• Ready

When indication is showing 0% signal and the green indication LED is burning continuously again,

then zero has been performed well. Also parameter Cntrlmode goes back to zero.

As last send 0 to parameter Initreset.

ATTENTION

Zero instrument

before use

Press and

hold

Until

Zeroing

Ready

Stop flow

PROCEDURE

Set process conditions

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Bronkhorst CORI-FLOW User Manual Page 18

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