VorTek SonoPro S36 Series, Instruction Manual

Page: 38 / 107

Series S36 Instruction Manual Chapter 2 Installation
800120 2-26
+
24 VDC Out
- 24 VDC Out
AC units only
Meter provided DC Power
Freq. Out +
Freq. Out -
Freq. Out voltage = +24 VDC
Figure 2-34. Iso. Freq. Output Using Meter Provided Power Supply
Alarm Output Connections
Two alarm outputs (Alarm 1 and Alarm 2) are included on the standard
SonoPro
® Professional Series Ultrasonic flow meter. The alarm output
requires a separate 5 to 36 VDC power supply. The alarm output optical
relay is a normally open single-pole relay. The relay can conduct a cur-
rent up to 40 mA. It is isolated from the meter electronics and power sup-
ply. Additionally, the relay has no polarity. Safely connect the input
wires (and resistor) to either terminal. When the alarm relay is closed, the
current draw will be constant. Make sure to size R
load
appropriately.
There are two connection options for the alarm output
– the first with a
separate power supply (Figure 2-34) and the second with the meter pro-
vided power supply (Figure 2-35). Use the first option with a separate
power supply (5 to 36 VDC) if a specific voltage is needed for the alarm
output. Use the second configuration if a 24 VDC, 100 mA Max, power
supply is acceptable for the alarm output. In either case, the voltage of
the alarm output is the same as the voltage supplied to the circuit.
The alarm output is used for transmitting high or low process conditions
as defined in the alarm settings (See page 3-8).
AC or DC powered meters
ALARM
ALARM
Figure 2-35. Isolated Alarm Output Using External Power Supply
+ 24 VDC Out
- 24 VDC Out
AC units only
Meter provided
DC Power
+24 VDC
Figure 2-36. Iso. Alarm Output Using Meter Provided Power Supply