Honeywell RMA 3000, User Manual

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4 34-ST-25-19 RMA 3000 Remote Meter Assemblies User Manual Release 1
6/04
Application - The DM can be used as an RMA 3000 component with any one of the following Smartline
Transmitters operating in the DE (Digital Enhanced) mode.
•
ST 3000
TM
Smart Pressure Transmitter
•
STT 3000
TM
Smart Temperature Transmitter
•
MagneW 3000
TM
Electromagnetic Flowmeter
Electrical Characteristics - The DM is a voltage-oriented device that is connected in parallel with the
transmitter via the Red (positive) wire and Yellow (negative) wire. The DM is an AC-coupled device that
senses the magnitude of the voltage pulses sent by the transmitter.
Each DM draws 0.5 mA of current. Several DM meters can be connected in parallel with the transmitter,
provided that the sum of the current loads imposed by each DM in the loop does not exceed the capacity of
the power supply.
ME – Analog Meter
Function
- The ME is an analog device that functions as an output indicator for any transmitter that
operates in the 4-20 mA current mode.
Application - The ME can be used as a Remote Meter Assembly component with any one of the
following Smartline Transmitters operating in the analog (4 to 20 mA) mode.
Electrical Characteristics – The ME is an electromechanical device of the D’Arsonval type. That is,
the current passing through a coil in the meter is used to deflect a needle to indicate the magnitude of the
current, where a current of 4-20 mA represents 0% to 100%.
The ME can be used in combination with the SM in the same loop, provided that the formula presented
under the SM description above in electrical characteristics for multiple meters is obeyed.