10 Signal outputs
10 Signal outputs
10.1 Analog and pulse outputs
If the S452 is purchased with the output option of analog and pulse
signals, it provides 2 analog outputs and 1 pulse output. All signals are
electrically isolated.
10.1.1 Analog output
The analog output can be used as an active output (current is sourced
through the positive connection pin) or passive output. In the passive
configuration a current signal is modulated into the external signal
voltage.
Active
:
4 to 20mA, RL < 400 Ω
Passive
:
4 to 20mA, supply voltage 18... 30 VDC, RL < 500 Ω
For HART
:
RL ≥ 250 Ω
Uncertainty :
< 0.3 % of reading
Resolution :
0.005 mA
10.1.2 Pulse output
No switch, no polarity required, galv. Isolate
Max. rating :
30 VDC, 200 mA
Pulse width :
10 ... 100 msec (depending on flow rate)
The maximum number of pulse per second is limited to 45 pulse per
second. As a result depending on the flow rate and the selected
consumption unit the maximum flow rate is limited to the values in the
table below.
18
