ASHE VZ-70 Panduan Pengoperasian - Halaman 2
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Halaman CetakSINGLE CHANNEL DATA LOGGER
[
MICRO-SD CARD INTERFACE]
WITH
MODEL: VZ-70
DESCRIPTION
The VZ-70 is a micro-controller based Digital process Indicator with data logging feature,
offered in a highly compact, rugged and reliable execution. The instrument has three keys
on the front panel, with which the operator can set the parameters and configure the
instrument as desired. A four-digit red LED digital display is provided on the front panel
which indicates the process value in real time. The display can indicate any scale range
between –999 to +9999 units. A Micro-SD Card slot to insert or removed SD Card.
The instrument has non-volatile memory (i.e., in case of power failure, the set points and
other settings are retained in memory and the indication and control actions resume after
power is restored).
The instrument accepts a standard analog current loop signal of 4 to 20 mA DC and
displays the process value with Periodic data logging into Micro SD Card as well as in
Microcontroller memory(Limited 4000 logs) the set points of which may be configured
through the Membrane Keypad on the front panel. Data Logging will always start when
process value crosses this set point.
The process display is factory calibrated to the desired operating range of the input
through the instrument software and may be changed whenever desired.
The input signal is suitably isolated and conditioned by the micro-controller, which
displays the actual process value in real time on the digital display.
The micro-controller based process Indicating and data logger Model: VZ-70 is therefore
an ideal instrument for process measurement applications because of it's versatility and
inherent accuracy in process measurement , besides other superior characteristics such
as total immunity to shocks, dust, ambient temperatures, and humidity. It is available in
standard DIN Rail enclosures. It operates on 24 V DC power supply.
Further, the instrument is manufactured using selected high-grade components which
guarantee it's functionality and long operational life. The instrument carries a performance
guarantee against manufacturing defects and workmanship defects.
INSTALLATION
All interconnections to the instrument should be made with strong multi-strand wire of the
order of 2.5 sq.mm. The ends of the wires should be properly ferruled and suitable lugs
must be used for effective termination.
The cables carrying the input signal should be routed separately and properly isolated
from any power line cables in the vicinity, to prevent any electromagnetic interference in
the input signal readings from the mains power line. Use of shielded twisted pair cable is
recommended for input signals. The shield must be connected to Earth only at the
instrument end.