Wika CPH6300 Manual do Utilizador descarregar pdf (Página 20)

6 Commissioning, Operation

20 WIKA Operating Instruction, Model CPH6300

14043054.01 07/2012 GB/D

6.4.5 CALC: Pressure change per time dP/dt

(only for sensor 1)

The CALC function “dPdt” allows displaying pressure changes per time directly. The corresponding

measuring intervals (t.int) can be freely chosen. The device automatically saves pressure values

during this period and calculates the pressure change rate (pressure change / time) from the

current measuring value and historical data.

TARE-button: Historical data is deleted, calculation restarts.

Example: Tightness testing for sewage ducts with requirements less than -3 mbar/min in a

5 minutes test duration at a test pressure of 250 mbar.

Equipment/presetting:

■ Sealing bladder and pressure pump

■ Sensor: CPT6200 (measuring range 0 … 1 bar)

■ bASE= Pet.n (minutes) time unit for pressure change rate

■ t.int = 1:00 (1 minutes) test duration, for which the pressure change rate is calculated

■ Logger: Cycl, 5 sek

Realising:

■ Connect all parts, arrange all necessary sealings

■ Start logger

■ Charge with pressure, wait for sufficient time

■ Restart calculation with button “TARE”

■ Current pressure value is displayed, button “SET” changes to dP:dt display

■ The display can give some preliminary information about the test result

(will it fail the test?)

■ Release pressure after 5 minutes

■ Stop logger

Evaluation:

Read out data logger with GSOFT, input at register “comment”:

Client, place of inspection, date, time, address / duct number, as-built data (duct type,

nominal size, etc), test instructions, pressures, tolerances, etc. as well as test result.

Therefore a comment sample can be prepared as file, company logo etc. can be added for

printing.

t.int- setting: If there are set high values the displayed values can be easily

misinterpreted, because the displayed value responds very slowly.

The displayed value is calculated: P(T

current

) – P(T

current

-t.int) / T.int

If there are no data for the whole t.int-period yet the values are extrapolated with the

already available data.

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 59 60

Comentários a estes Manuais

Sem comentários

Wika CPH6300 Manual do Utilizador Página 20

Comentários a estes Manuais

Manuais e produtos relacionados com Instrumentos de medida Wika CPH6300