TechnipFMC Smith Meter MMRT, Технические характеристики / Установка / Эксплуатация

Страница: 9 / 10

9 Bulletin SS09040 Issue/Rev. 0.2 (10/14) Bulletin SS09040 Issue/Rev. 0.2 (10/14)
Rate Scaler
Calculating the Rate Scale Factor
This 1/Tau rate meter calculates rate by measuring the time
interval between input pulses, converting to a frequency
(F = 1/Tau), and multiplying the product by the rate scaler.
The rate scaler is user-programmed to convert the count
input frequency into the desired rate units for display
(gallons/minute, gallons/hour, liters/minute, cubic meters/
hour, etc.).
Rate Scaler Range: 0.001 to 9999
Rate Scaler (RS) formula:
where:
SEC is the number of seconds in the rate time unit (items/
second = 1, items/minute = 60, items/hour = 3600, etc.).
DPF is the decimal point factor corresponding to the
desired decimal point location on the run mode screen:
Display DPF
XXXX 1
XXX.X 10
XX.XX 100
X.XXX 1000
PPI is the number of pulses per item from the sensor.
Example 1: A transmitter produces 50 pulses per
gallon of product. Display rate in whole gallons per
minute (XXXX).
Example 2: A flow sensor produces 15,800 pulses per cubic
meter. Display flow rate in tenths of liters per hour.
RS = for R x 10
Sec x DPF
PPI x 10
RS = = 1.200
60 X 1
50
RS = = 2.278
3600 x 10
15,800
Programming Rate Scale Factor
The third program mode screen allows you to enter the rate
scale factor.
The lower case "d" appears on the right of the display when
it is time to enter the decimal point position for the rate
scaler.
Note: This decimal point is used for the rate scaler only and
will not appear on the rate meter screen.
Press the key to change the first digit to the correct
value. Press the key to select the next digit to
be changed. Repeat this process until all the digits are
correct. When the "d" appears, press the key until
the decimal point is in the desired location.
Ratemeter Decimal Point
The fourth program mode screen is used to enter the
decimal point position for the rate meter run-mode display.
The display will show the screen number (4) and four zeros.
Press the key until the decimal point is in the
correct position.