Emerson Daniel PT, Инструкция по установке и обслуживанию

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frequencies allows the turbine meter to operate at its lowest possible flow rates.
Reduced sensitivity at high frequencies prevents spurious counting due to RFI and
transients.
•
Common Mode Rejection:
The Preamp employs a differential amplifier which responds only to differences
between the COIL+ and COIL- wires.
• Dual Outputs:
With its dual outputs, the Preamp works with virtually any end device. One output
swings from 0V to 5V regardless of the power supply voltage, and is suited for most
inputs with thresholds of 4V or less. An open collector output swings from 0V to any
available power supply voltage up to 36V, sinking up to 50 mA.
•
Wide Power Supply Range, Low Power Operation:
The Preamp operates with any power supply voltage from 5.4 to 26V and requires less
than 1 mA. It can be added to virtually any system without special power conditioning,
and typically with no impact on power system requirements.
• Bullet-Proof I/O:
All field wiring terminals are protected against ESD (electrostatic discharge) and
transients.
• Rugged and Convenient Packaging:
The Preamp is fully encapsulated in a compact package suitable for mounting on a
panel or in a standard 3" ID explosion-proof housing. Pluggable cage-clamp type
connectors allow convenient, reliable connections without the need for lugs. Terminals
are labeled with signal names to simplify installation.
Figure 4-2: Universal Pre-amplifier 0-5V out configuration
Turbine meter instrumentation Installation and maintenance instructions
October 2019 3-9008-011
34 Daniel “PT” Liquid Turbine Meters