Longrun LRF-3300S, Руководство пользователя

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LRF-3300S Ultrasonic Transit-time Flow meter
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Use and to switch calibrate the current loop 4mA output. Use an ammeter to measure the output
current of current loop and adjust the displayed numbers at the same time. Watch the ammeter until it reads 4.00.
Stop at this point, the 4mA has been calibrated.
Use and to switch calibrate the current loop 20mA output. The method is the same as 4mA
calibration.
The results are automatically saved in EEPROM and won’t lose when power off.
4.12. SD Card Operation
4.12.1 Specifications
Data collection interval: any interval settings from 1 to 3600 seconds are OK according to the requirement.
Data content: date and time, flow rate, flow velocity, total flow, positive totalizer, negative totalizer.
Data storage format:
a=2017-11-16,16:21:12
b=+2.00 m3/h
c=+9.380460E-02 m/s
d=+3.02 m3
e=+3.02 m3
f=+0.00 m3
g=+0.00 GJ/h
h=+0.00 GJ
i=+0.00 GJ
j=+0.00`C
k=+0.00`CFile
system format: FAT16.
File type: plain text file (.TXT).
File number: maximum 512pcs.
It can save 120 bytes of data each time. If it is set to save once in per 5 seconds, the capacity of storing file in 24
hours is 120*3600/5*24
＝
2073600byte≈2.1Mbyte, therefore, 1Gbyte SD card can store for days: 1024/2.1=
487.6≈487 days. When the capacity of the SD card is full, the new data will override the earliest files
automatically.
4.12.2 Install or Remove the SD card while the meter is powered on
If the operator desires to insert the SD card with power on, please remove the power with power off. The
following operation is to be used: