Pulsar Ultra 4 - Page 25

PULSAR MEASUREMENT
25
Relay Outputs
All four of the relays can be programmed for a variety of alarms, pump
control, or other process functions. Three relays have contacts rated at 5A at
240V AC. The fourth is a low power solid state SPNO isolated relay, intended
to be suitable for pulse counter functions.
All connections should be fused or protected such that the short circuit
capacity of the circuits to which they are connected is limited so that they do
not exceed the relay rating.
Current Output
This is an isolated (floating) mA output (to 150 V), of 4 - 20mA or 0 - 20mA,
and the load should not exceed 500

.
RS2323 Serial Interface
If required, you can connect to the serial interface to operate your Ultra 4
remotely.
Wire/cable ratings & sizes (Copper conductors)
CONNECTOR
RATING
WIRE SIZE
(MIN)
WIRE SIZE
(MAX)
Power, AC
120V / 240V 2A min
0.5mm
2
/20 AWG
2.5mm
2
/ 12
AWG
Power, DC
30V 2A min.
0.5mm
2
/20 AWG
Relays 1-3
For max. rated 5A rms
use 1mm2 / 18AWG min.
Depends on
load.
Relay 4, SSR
30V 0A2 min.
0.2mm
2
/30 AWG
Transducer
30V 0A2 min. Pulsar
cable is 0.5mm2 /
20AWG.
0.2mm2 /
30AWG.
mA out
30V 0A2 min
Depends on
distance.
Comms.
150V 0A2 min.
0.2mm2 /
30AWG
Gateway RS232
30V 0A2 min
0.2mm2 /
30AWG
1.5mm
2
/ 12
AWG