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Ultrasonic Heatmeter
Operation Manual
20
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.
5.11. SD Card Operation
5.1.1. 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.
5.1.2. 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:
Attention:
Do not remove the SD card from the reader while actively working with the data. Data should
be saved and stored in a separate location on the PC, and then processed form that file
location. Processing the data directly from the SD card file location on the PC could result in
losing or destroying data if the SD card is removed while still being processed.