Fuji Electric Time Delta-C FSV-2 User Manual

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4.11.11. How to set the detailed setting
Description

The data required for time difference measurement can be set as follows.

This parameter is intended for our service personnel.

Do not change the setting by yourself. Otherwise measurement may be disabled.

Make the detailed setting only when a problem should arise in flow rate measurement with factory default settings, and
instructed to do so by a trained factory representative. Setting need not be made in other cases.

Setting items
Item Input method Function, range or menu
Transmission
count Select
The number of transmission of ultrasonic signals per flow rate signal output
*1
. (Factory-set
value: 128)
When standard mode is selected for the operation mode:

8, 16, 32, 64, 128, 256
When high speed response mode is selected for the operation mode:

4, 8, 16, 32, 64, 128
Trigger control
Select
Numeric value
Control method setting of the trigger level (detection point) of ultrasonic signals. (Factory-set
value: AUTO)

AUTO

MANUAL
Select the detection point according to the rate against the peak of receiving wave
regarded as 100%.

Trigger level: 10% to 90%.
Window control
Select
Numeric value
Numeric value
Setting of control method of measurement window that takes in signals (Factory-set value:
AUTO)

AUTO

MANUAL
Set the time of starting taking in signals (period from the start of transmission until the
startup of window signals)

U: open time: 1μs to 16383μs

D: open time: 1μs to 16383μs
Note) U: forward direction, D: reverse direction
In case of MANUAL, set U and D.
Saturation (level)
Numeric value
The number of times that the amplitude of received signals fluctuates and exceeds ±1.0V
(saturation) per 1 flow rate signal output. Used as the threshold value for judging the error
status of signals. A signal error occurs if the specified number of times is exceeded.
(Factory-set value: 128) Refer to diagram *1) in the next page.

0 to 256
Measurement
method Select
Setting of measurement method for measuring transit time. (Factory-set value: method 2)

Method 1: Strong against interference

Method 2: Controls triggers on the plus side of the direction of voltage of received signals.

Method 3: Controls triggers on the minus side of the direction of voltage of received
signals.
Signal balance
Numeric value
Setting of threshold value used for judging the existence of transit time. A signal error occurs
if the specified value is exceeded. (Factory-set value: 25%)

0% to 100%
Note) Set to 50% or higher for Method 1.
Transmission
pattern Select
Setting of transmission pattern of ultrasonic signals (Factory-set value: Burst 3)

Select from BURST 1, BURST 2, BURST 3, BURST 4, BURST 5, CHIRP 4 and CHIRP 8.
AGC gain
Select
Numeric value
Numeric value
Setting of control method of signal AGC gain (Factory-set value: AUTO)
Signal peak is controlled to be kept at 1.5V
PP
.

AUTO

MANUAL
Make the setting so that the signal peak in both forward and reverse directions is kept at
1.5V
PP
.

Forward gain: 1.00% to 99.00%

Reverse gain: 1.00% to 99.00%
Signal peak
Select
Setting of signal peak threshold value per 1 flow rate signal output *1). Used as the
threshold value for judging the error status of signals. A signal error occurs if the value
becomes lower than the specified value. (Factory-set value: 3072)

0.5V(4096) : Equivalent to 0.5V
0P

0.375V(3072) : Equivalent to 0.375V
0P

0.25V(2048) : Equivalent to 0.25V
0P

0.125V(1024) : Equivalent to 0.125V
0P
Transmission
wait time
Numeric value Transmission interval of ultrasonic signals. (Factory-set value: 5msec)

5msec to 30msec
For actual keying, refer to the typical operation indicated below. Set the protection to OFF beforehand. (See Section 4.4.1.)
CAUTION

Fuji Electric Time Delta-C FSV-2 Specifications

General

Brand	Fuji Electric
Model	Time Delta-C FSV-2
Category	Measuring Instruments
Language	English