Chapter 2. Installation
44
PanaFlow™ MV80 & MV82 User’s Manual
2.6.5 Alarm Output Connections
One alarm output (
Alarm 1
) is included on the standard PanaFlow meter. Two or more alarms (
Alarm 2
and
Alarm 3
) are
included on the optional communication board. The alarm output is used for transmitting high or low process
conditions, as defined in the alarm settings (see
).
The alarm output optical relays are normally-open, single-pole relays, which have a nominal 200 volt/160 ohm rating
(i.e., a nominal on-resistance of 160 ohms and a maximum voltage of 200 volts across the output terminals). However,
there are current and power specifications that must be observed. The relay can conduct a current up to 40 mA and can
dissipate up to 320 mW of power. The relay output is isolated from the meter electronics and the power supply. When
the alarm relay is closed, the current draw is constant. Make sure to size R
load
appropriately.
There are three connection options for the alarm output:
•
For AC or DC powered meters, use a separate 5 to 36 VDC power supply (see
). Use this
option if a specific voltage is needed for the alarm output.
•
For DC powered meters only, use the flow meter power supply (see
the voltage at the flow meter power supply is an acceptable driver voltage for the connected load, taking into
account that the current used by the alarm load comes from the meter’s power supply.
•
For AC powered meters only, use the internal 24 VDC power supply (see
option if the voltage of the alarm output is the same as the voltage supplied to the circuit.
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