Vega EL 11 - Adjustment with HART-handheld

36 Capacitive electrodes EL 4 … 20 mA - compact
4.4 Adjustment with HART
®
-
handheld
The capacitive electrodes EL with oscillator
CAP E32 H Ex are suitable for HART
®
-protocols
and can be adjusted with a HART
®
-handheld.
All relevant sensor functions can be carried out
with the HART
®
-standard menus. A
manufacturer specific DDD (Data-Device-
Description) is not necessary.
Connect the HART
®
-handheld to the signal line
after you have connected the sensor to the
supply voltage.
4
3
2
1
+ - + -
mA
250 Ω
HART
®
-handheld
With this function you can start a new
connection. This function can also be activated
with key F8.
Modem
This window enables the adjustments for data
transmission with a modem. This function can
also be activated with key F7.
No special requirements necessary for the
modem used.
Note
When the resistor of the supply voltage is less
than 250␣ Ω, a resistor must be looped into the
signal/connection line during adjustment. The
digital adjustment and communication signals
would be shortcircuited via too small resistors
e.g. of the current source or the processing
system so that the sensor communication
would no more be ensured. The easiest way
would be to connect the required resistor in
parallel to the socket of the HART
®
-handheld
(see fig. 1, page 38).
Set-up
Multidrop-operation
With the HART
®
-handheld the Multidrop-
operation can be chosen.
Hence several HART
®
-sensors can be
composed on one two-wire line.
The sensor provides beside the 4 … 20 mA-
signal also a digital (HART
®
) level signal.
• When you enter address 0 (factory setting),
the sensors takes a level independent 4 …
20 mA-current and delivers a digital (HART
®
)
level signal. In this line e.g. also an indicating
instrument (4 … 20 mA) can be looped.
• When you enter an address from 1 to 15, the
sensor takes permanently a current of 4 mA
and delivers a digital (HART
®
) level signal.
Burst-operation
Normally the sensor signals the measured
values to the processing unit only on request.
When you switch on Burst-operation, the sensor
signals the measured values without request.