SOMMER SPA-2, Руководство пользователя

Страница: 55 / 111

Option Description
Interval (default) Measurements are initiated in a specified interval.
TRIG input Measurements are triggered by the positive edge of a DC-voltage signal
applied to the TRIG input (low: 0 ... 0.6 V, high: 2.2 ... 28 V, min. pulse width:
30 ms)
SDI-12/RS-485 Measurements are externally triggered by commands via RS-485 or SDI-12
from ,e.g. a data logger.
all allowed Measurement is triggered by all options mentioned above.
Measurement Interval
A measurement interval between 20 sec and 3 hours can be selected.
Output protocol (OP)
The type of the serial output protocol. The following options are available:
Option Description
Sommer (default) Sommer protocol; data values are returned with an index starting at 1
Standard Standard protocol; data values are returned without an index
MODBUS Modbus protocol
OP, information
The main measurement values are always included in the data output string. Additionally, special
and analysis values can be included. See
Which data do I get? for details.
10.4.2 Calibration of SPA-2-ribbon-sensors
The SPA-ribbon-sensors are calibrated by measuring the complex capacities in dry air (zero) and
with an attached reference plate that simulates a certain water content (span). Sommer Mess-
technik only ships calibrated SPA-ribbon sensors and generally, a regular zero-check of the sensors
is sufficient. If required, the reference plate can be obtained from Sommer Messtechnik.
10
C
o
n
fig
u
ra
ti
o
n
Manual 55