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25
DPF20 Frequency, rate, total or period counter
Instruction Manual
Option
AO
Output type
analog output
Output signals
4/20
mA active
4/20
mA passive
0/10
Vdc
Max. signal output
22
mA, 10.5
Vdc
Min. signal output
0
mA, -50
mVdc
Scaling
related to the instruments reading
direct or inverse slope
Vexc (terminal A)
+13.8
Vdc ± 0.4
Vdc (max. 25
mA)
protected against short circuit
Load impedances
≤350
Ohms (in 4/20
mA active)
≤800
Ohms (in 4/20
mA passive)
(with a
24 Vdc external Vexc) (maximum 27 Vdc
between terminals ‘B’ and ‘C’)
≥10
KOhms (in 0/10
Vdc)
Accuracy (at 25
ºC)
<0.1
% FS
Thermal stability
60
ppm/ºC in mA mode
50
ppm/ºC in Vdc mode
Step response
<75
mS meter step response
(0% to 99% signal)
Isolation
1000 Vdc
Warm-up
15 minutes
Type of terminal
plug-in screw terminal
pitch 5.08 mm
Installation allowed at
‘Opt.1’, ‘Opt.2’, ‘Opt.3’
Rear view DPF20
Power
Opt.2
Opt.1
Op
t.3
A B C
A B C
Signal
A B C
MV
MV
M
V
Module AO provides 1 analog output configurable as 4/20 mA or
0/10 Vdc, to install in DPF20 digital panel meters.
Configuration is performed from the frontal keypad of the meter, by
setting the parameters at the options configuration menu (‘Opt.1’,
‘Opt.2’ or ‘Opt.3’ depending on the position the module is installed).
The output signal is proportional to the instrument reading, and it
can be fully scaled with direct (positive) or inverted (negative) slopes.
The mA output can be configured as an active loop (the instrument
provides the excitation for the loop ) or as a passive loop (the loop is
externally powered).
Up to a maximum of 3 analog output modules can be installed in a
single instrument, all outputs isolated between them and isolated
from all other circuits.
Modules AO can be ordered pre-installed into a DPF20 digital panel
meter, or standalone for delayed installation, as they do not require
soldering or special configuration.
Module
Connections
Module AO - Analog output
Terminal A
Vexc
Terminal B
Signal (mA or Vdc)
Terminal C
GND
Jumper M
closed for ‘mA’
Jumper V
closed for ‘Vdc’
Table 8 - Connection terminals
Output 4/20
mA active
The current loop is pow
-
ered from the ‘AO’ mod
-
ule
Jumper ‘M’
closed
Signal
Vexc.
A B C
M V
Output 4/20
mA passive
The current loop is pow
-
ered from an external
equipment
Signal-
Jumper ‘M’
closed
A B C
M V
Output 0/10 Vdc
Jumper ‘V’
closed
Com.
Signal
A B C
M V
Table 9 - Connections for each output mode
2.2 Module AO