Gossen MetraWatt SIRAX V 644 Mode D'emploi page 24

Measuring output
Output signals A1 and A2
The output signals can be either load-independent DC currents
I or DC voltages U . The desired mode is set on DIP switches
A A
and the setting range is programmed on a PC. A1 and A2 are
not DC isolated and the same value is available at both
outputs.
Standard ranges for I : 0...20 mA or 4...20 mA
A
External resistance I : R max. [kΩ] =
A1 ext
resp. =
I = Full-scale output current value
AN
External resistance I : R max. [kΩ] =
A2 ext
Standard ranges
for U : 0...5, 1...5, 0...10 or 2...10 V
A
Load capacity
[kΩ] ≥
U / U : R
A1 A2 ext
Power supply H
AC/DC power pack (DC and 45...400 Hz)
Table 2: Rated voltages and tolerances
Rated voltage Fuse
U
N
24... 60 V
T 250 mA
DC / AC
85...230 V 1
T 100 mA
DC / AC
24... 60 V
T 160 mA
DC / AC
85...230 V
T 80 mA ± 15%
AC
85...110 V
T 80 mA – 15...+ 10%
DC
Power consumption: < 1.4 W resp. < 2.7 VA
Output contact K
The output contact can be used:
a) as an additional means of signalling operation of the
open-circuit sensor supervision when the transmitter
is used in conjunction with resistance thermometers,
thermo-couples, resistance sensors and potentio-
meters.
b) to monitor the measured variable in relation to a limit
or its rate-of-change where an additional means of
signalling operation of the open-circuit sensor super-
vision (see "a") is considered unnecessary.
c) to monitor the measured variable in relation to a limit
or its rate-of-change when measuring a DC voltage or
a current.
Note on a): The relay has to be activated by programming its
operating mode as "energised" or "de-
energised".
Available operating modes are:
"Output at last value, relay energised"
"Output at last value, relay de-energised"
"Output at setting, relay energised"
"Output at setting, relay de-energised"
24
15 V
I [mA]
AN
– 12 V
I [mA]
AN
0.3 V
I [mA]
AN
U [V]
A
20 mA
Tolerances Instrument
version
DC – 15...+ 33%
Standard
AC ± 15%
(Non-Ex)
DC – 15...+ 33%
Type of
AC ± 15%
protection
intrinsically
safety
[EEx ia] IIC
Relay pick-up/reset threshold:
1 to 15 kΩ, acc. to measuring mode and range
Note on b): The relay must be activated by programming:
"Output corr. to input variable, relay inactive"
The limit must also be programmed (see Section
"Limit")
Note on c): It is only necessary to program the limit (see
remarks on "b)" above)
Limit value GW
Limit value type: Programmable
– for monitoring the input variable
in relation to a lower or upper limit
between – 10 and +110%
left side of Fig. 3)
or
– for monitoring the rate-of-change
of the input variable
Slope =
between ± 1 and ± 50%/s
right side of Fig. 3)
Hysteresis: Programmable from
0.5 to 100%
resp.
1 to 100%/s
Operating and
resetting delays: Programmable from
1 to 60 s
Input variable
limit
Lower Upper
G S
GW
H
H
GW
S G
H hysteresis, GW limit value, G operation area, S failure area
Fig. 3. Switching function according to limit monitored.
Light emitting diodes
( (
Table 3: Red LED ( , , Fig. 2)
Operating modes
( (
Open-circuit sensor
or lead
Above or below limit 3
1
Caution! Observe note in Section 7.3.
2 In relation to analogue output spans A1 resp. A2.
3
Only applies when the output contact K is used for monitoring the
input variable in relation to a limit.
2
(see
∆ measured variable
∆ t
2 (see
2
2
Rate-of-change
of input variable
Slope
S
H
G
Time
Red LED
lit
lit /not lit
(acc. to programming)